Things You Thought You Didn’t Need To Care About That Have a Big Impact On Your Job

Development is about working with computers, right? Well, not quite. Development is all about working with computers (easy), and working with people (hard). Oh, and it’s about physics. Things like the speed of light and thermodynamics influence APIs, because they influence hardware and networking. If, like Holly, you slept through statistics modules in university, it will be a surprise to discover how statistics has changed our development workflows. Finally, we mustn’t forget economics. The end of zero-interest-rates has changed the employment landscape for many of us. In this wide-ranging talk, Holly will cover why the end of Moore’s law means we might finally need to get to grips with concurrent programming, why is Loom a good idea now when green threads were a bad idea, why is AOT a good idea now when it used to be a bad idea, and how much you should care about business studies, finance, and statistics.

Transcript

1. Holly Cummins IBM Things You Thought You Didn’t Need To Care About That Have a Big Impact On Your Job Agile Manchester 2026
2. @hollycummins.com #Quarkus #IBM invisible forces shaping your job
3. history 101
4. geography 101
5. geography 101
6. norway geography 101
7. @hollycummins.com #Quarkus #IBM
8. @hollycummins.com #Quarkus #IBM ski_regions:
9. @hollycummins.com #Quarkus #IBM ski_regions: - fr
10. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch
11. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se
12. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no
13. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no
14. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no {"ski_regions": ["fr", "ch", "se", false]}
15. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no {"ski_regions": ["fr", "ch", "se", false]}
16. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no {"ski_regions": ["fr", "ch", "se", false]}
17. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no {"ski_regions": ["fr", "ch", "se", false]}
18. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no {"ski_regions": ["fr", "ch", "se", false]}
19. @hollycummins.com #Quarkus #IBM ski_regions: - fr - ch - se - no {"ski_regions": ["fr", "ch", "se", false]} false - no
20. @hollycummins.com #Quarkus #IBM sensible decision had a bad outcome … because geography
21. how can we know what outcomes our decisions will have?
22. how can we make decisions in a complex world?
23. @hollycummins.com #Quarkus #IBM systems thinking
24. how can we make fast decisions in an uncertain world?
25. statistics 101
26. @hollycummins.com #Quarkus #IBM what do you call a statistician who lives in san francisco?
27. geography 201
28. @hollycummins.com #Quarkus #IBM what do you call a statistician who lives in san francisco?
29. @hollycummins.com #Quarkus #IBM what do you call a statistician who lives in san francisco? a data scientist.
30. @hollycummins.com #Quarkus #IBM statistics
31. @hollycummins.com #Quarkus #IBM data science statistics
32. @hollycummins.com #Quarkus #IBM data science statistics machine learning
33. @hollycummins.com #Quarkus #IBM data science statistics AI machine learning
34. @hollycummins.com #Quarkus #IBM even if you’re not doing AI, statistics is important
35. Bayes’ theorem statistics 101
36. how can we detect spam?
37. @hollycummins.com #Quarkus #IBM “spamicity”
39. Exciting offer just for you! Deep discounts on Viagra. Limited time offer, act now.
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42. Exciting offer just for you! Deep discounts on Ozempic. Limited time offer, act now.
44. banned-words:
45. banned-words: - Ozempic
46. banned-words: - Ozempic
47. banned-words: - Ozempic
48. Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now.
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50. Exciting offer just for you! Deep discounts on Ozempick. Limited time offer, act now.
52. banned-words:
53. banned-words: - Ozempic - Ozempick - Ozempik - 0zempic - Ozemp1c - Øzempic - 0zempick - …
54. banned-words: - Ozempic - Ozempick - Ozempik - 0zempic - Ozemp1c - Øzempic - 0zempick - …
55. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now.
56. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already.
57. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already.
58. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already. Ozemp1c
59. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already. Ozemp1c offer
60. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already. Ozemp1c yesterday offer
61. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already. Ozemp1c dishwasher yesterday offer
62. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already. Ozemp1c dishwasher yesterday offer
63. Dear friend, Exciting offer just for you! Deep discounts on Ozemp1c. Limited time offer, act now. Hey Alice, How is the data science course and San Francico? We had drama yesterday because the dog threw up, on the clean dishes in the dishwasher! On the bright side, at least it was easy to clean up. I started my Ozempic on Sunday, and so far so good. I can see my appetite is less already. Ozemp1c dishwasher yesterday offer
64. offer act discount Ozemp1c dog dishwasher yesterday Ozempic
66. @hollycummins.com #Quarkus #IBM P(spam | 0zemp1c)
67. @hollycummins.com #Quarkus #IBM P(spam | 0zemp1c) “probability of”
68. @hollycummins.com #Quarkus #IBM P(spam | 0zemp1c) “given” “probability of”
69. @hollycummins.com #Quarkus #IBM P(A | B) = P(B | A) · P(A) P(B)
70. @hollycummins.com #Quarkus #IBM probability of A, given B P(A | B) = P(B | A) · P(A) P(B)
71. @hollycummins.com #Quarkus #IBM probability of A, given B probability of B, given A P(A | B) = P(B | A) · P(A) P(B)
72. @hollycummins.com #Quarkus #IBM probability of A, given B probability of B, given A probability of A P(A | B) = P(B | A) · P(A) P(B)
73. @hollycummins.com #Quarkus #IBM probability of A, given B probability of B, given A probability of A probability of B P(A | B) = P(B | A) · P(A) P(B)
74. @hollycummins.com #Quarkus #IBM probability of A, given B probability of B, given A probability of A probability of B guidance for a decision P(A | B) = P(B | A) · P(A) P(B)
75. @hollycummins.com #Quarkus #IBM P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c)
76. @hollycummins.com #Quarkus #IBM is this email spam? P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c)
77. @hollycummins.com #Quarkus #IBM is this email spam? what proportion of spam talks about Ozemp1c? P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c)
78. @hollycummins.com #Quarkus #IBM is this email spam? what proportion of spam talks about Ozemp1c? what proportion of emails are spam? P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c)
79. @hollycummins.com #Quarkus #IBM is this email spam? what proportion of spam talks about Ozemp1c? what proportion of emails are spam? what proportion of all emails mention Ozemp1c? P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c)
80. @hollycummins.com #Quarkus #IBM P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c) what proportion of spam talks about Ozemp1c? what proportion of emails are spam? what proportion of all emails mention Ozemp1c? is this email spam?
81. @hollycummins.com #Quarkus #IBM P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c) 1% what proportion of spam talks about Ozemp1c? what proportion of emails are spam? what proportion of all emails mention Ozemp1c? is this email spam?
82. @hollycummins.com #Quarkus #IBM P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c) 1% 0.001% what proportion of spam talks about Ozemp1c? what proportion of emails are spam? what proportion of all emails mention Ozemp1c? is this email spam?
83. @hollycummins.com #Quarkus #IBM P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c) 1% 6% 0.001% what proportion of spam talks about Ozemp1c? what proportion of emails are spam? what proportion of all emails mention Ozemp1c? is this email spam?
84. @hollycummins.com #Quarkus #IBM P(spam | Ozemp1c) = P(Ozemp1c | spam) · P(spam) P(Ozemp1c) 1% 6% 0.001% 60%
85. @hollycummins.com #Quarkus #IBM P(A | B) = P(B | A) · P(A) P(B)
86. @hollycummins.com #Quarkus #IBM P(A | B) what if I don’t know any of these numbers?? = P(B | A) · P(A) P(B)
87. @hollycummins.com #Quarkus #IBM P(A | B) what if I don’t know any of these numbers?? or this one? = P(B | A) · P(A) P(B)
88. @hollycummins.com #Quarkus #IBM P(A | B) what if I don’t know any of these numbers?? or this one? most useless formula ever? = P(B | A) · P(A) P(B)
89. @hollycummins.com #Quarkus #IBM P(A | B) = P(B | A) · P(A) P(B)
90. @hollycummins.com #Quarkus #IBM guess! P(A | B) = P(B | A) · P(A) P(B)
91. @hollycummins.com #Quarkus #IBM guess! guess! P(A | B) = P(B | A) · P(A) P(B)
92. @hollycummins.com #Quarkus #IBM guess! guess! guess! or ignore, because it’s a normalizing factor P(A | B) = P(B | A) · P(A) P(B)
93. @hollycummins.com #Quarkus #IBM P(A | B) = P(B | A) · P(A) P(B) P(A
94. @hollycummins.com #Quarkus #IBM recursion P(A | B) = P(B | A) · P(A) P(B) P(A P(A P(A)
95. @hollycummins.com #Quarkus #IBM recursion P(A | B) = P(B | A) · P(A) P(B) P(A (cheating) P(A P(A)
96. @hollycummins.com #Quarkus #IBM recursion P(A | B) = P(B | A) · P(A) P(B) P(A (cheating) (iteration) P(A P(A)
97. @hollycummins.com #Quarkus #IBM
98. @hollycummins.com #Quarkus #IBM "ignorance... coined into science."
99. @hollycummins.com #Quarkus #IBM "ignorance... coined into science." “a staggering falsity”
100. @hollycummins.com #Quarkus #IBM "ignorance... coined into science." “a staggering falsity” “perhaps the only error to which the mathematical world has so deeply committed itself”
101. @hollycummins.com #Quarkus #IBM
102. @hollycummins.com #Quarkus #IBM
103. @hollycummins.com #Quarkus #IBM cowpox?
104. @hollycummins.com #Quarkus #IBM cowpox? chickenpox?
105. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots)
106. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots)
107. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85%
108. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85% 1%
109. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85% 1% 90%
110. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85% 1% 90% 0.0001%
111. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85% 1% 90% 0.0001% 0.85%
112. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85% 1% 90% 0.0001% 0.85% 0.0009%
113. @hollycummins.com #Quarkus #IBM P(chickenpox | spots) P(cowpox | spots) = = P(spots | chickenpox) · P(chickenpox) P(spots) P(spots | cowpox) · P(cowpox) P(spots) 85% 1% 90% 0.0001% 0.85% 0.0009%
114. @hollycummins.com #Quarkus #IBM it’s chickenpox
115. @hollycummins.com #Quarkus #IBM common sense it’s chickenpox
116. @hollycummins.com #Quarkus #IBM magic static analysis tool 99% accurate
117. @hollycummins.com #Quarkus #IBM ✓ code is clean ☺
118. @hollycummins.com #Quarkus #IBM what’s the chance the code is clean? ✓ code is clean ☺
119. @hollycummins.com #Quarkus #IBM P(clean code | clean report) = P(clean report | clean code) · P(clean code) P(clean report)
120. @hollycummins.com #Quarkus #IBM P(clean code | clean report) = P(clean report | clean code) · P(clean code) P(clean report) 99%
121. @hollycummins.com #Quarkus #IBM P(clean code | clean report) = P(clean report | clean code) · P(clean code) P(clean report) 99% 1.98%
122. @hollycummins.com #Quarkus #IBM P(clean code | clean report) = P(clean report | clean code) · P(clean code) P(clean report) 99% 1% 1.98%
123. @hollycummins.com #Quarkus #IBM P(clean code | clean report) = P(clean report | clean code) · P(clean code) P(clean report) 99% 1% 1.98% 50%
124. @hollycummins.com #Quarkus #IBM not common-sense
125. @hollycummins.com #Quarkus #IBM bayes is everywhere
126. @hollycummins.com #Quarkus #IBM artificial intelligence
127. @hollycummins.com #Quarkus #IBM medicine
128. @hollycummins.com #Quarkus #IBM top tip
129. @hollycummins.com #Quarkus #IBM tired: “we have no idea” top tip
130. @hollycummins.com #Quarkus #IBM tired: “we have no idea” wired: “we are adopting bayesian thinking” top tip
131. why does concurrency make my head hurt?
132. @hollycummins.com #Quarkus #IBM concurrency is hard
133. @hollycummins.com #Quarkus #IBM amdahl’s law
134. @hollycummins.com #Quarkus #IBM 𝖯 ( 𝖼𝗈 𝗇𝖼 𝗎 𝗋 𝗋𝖾 𝗇𝖼 𝗒 ∣ 𝗁 𝖾𝖺𝖽𝖺 𝖼𝗁𝖾 ) = 𝖯 ( 𝗁 𝖾 𝖺 𝖽 𝖺𝖼 𝗁𝖾 ∣ 𝖼𝗈𝗇 𝖼 𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) ⋅ 𝖯 ( 𝖼𝗈𝗇 𝖼𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) 𝖯 ( 𝗁 𝖾𝖺𝖽 𝖺 𝖼𝗁𝖾 )
135. @hollycummins.com #Quarkus #IBM 𝖯 ( 𝖼𝗈 𝗇𝖼 𝗎 𝗋 𝗋𝖾 𝗇𝖼 𝗒 ∣ 𝗁 𝖾𝖺𝖽𝖺 𝖼𝗁𝖾 ) = 𝖯 ( 𝗁 𝖾 𝖺 𝖽 𝖺𝖼 𝗁𝖾 ∣ 𝖼𝗈𝗇 𝖼 𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) ⋅ 𝖯 ( 𝖼𝗈𝗇 𝖼𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) 𝖯 ( 𝗁 𝖾𝖺𝖽 𝖺 𝖼𝗁𝖾 ) can I blame concurrency for my headache?
136. @hollycummins.com #Quarkus #IBM 𝖯 ( 𝖼𝗈 𝗇𝖼 𝗎 𝗋 𝗋𝖾 𝗇𝖼 𝗒 ∣ 𝗁 𝖾𝖺𝖽𝖺 𝖼𝗁𝖾 ) = 𝖯 ( 𝗁 𝖾 𝖺 𝖽 𝖺𝖼 𝗁𝖾 ∣ 𝖼𝗈𝗇 𝖼 𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) ⋅ 𝖯 ( 𝖼𝗈𝗇 𝖼𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) 𝖯 ( 𝗁 𝖾𝖺𝖽 𝖺 𝖼𝗁𝖾 ) can I blame concurrency for my headache? how many devs can cope with concurrency?
137. @hollycummins.com #Quarkus #IBM 𝖯 ( 𝖼𝗈 𝗇𝖼 𝗎 𝗋 𝗋𝖾 𝗇𝖼 𝗒 ∣ 𝗁 𝖾𝖺𝖽𝖺 𝖼𝗁𝖾 ) = 𝖯 ( 𝗁 𝖾 𝖺 𝖽 𝖺𝖼 𝗁𝖾 ∣ 𝖼𝗈𝗇 𝖼 𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) ⋅ 𝖯 ( 𝖼𝗈𝗇 𝖼𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) 𝖯 ( 𝗁 𝖾𝖺𝖽 𝖺 𝖼𝗁𝖾 ) can I blame concurrency for my headache? how many devs can cope with concurrency? how much concurrency is there?
138. @hollycummins.com #Quarkus #IBM 𝖯 ( 𝖼𝗈 𝗇𝖼 𝗎 𝗋 𝗋𝖾 𝗇𝖼 𝗒 ∣ 𝗁 𝖾𝖺𝖽𝖺 𝖼𝗁𝖾 ) = 𝖯 ( 𝗁 𝖾 𝖺 𝖽 𝖺𝖼 𝗁𝖾 ∣ 𝖼𝗈𝗇 𝖼 𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) ⋅ 𝖯 ( 𝖼𝗈𝗇 𝖼𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) 𝖯 ( 𝗁 𝖾𝖺𝖽 𝖺 𝖼𝗁𝖾 ) can I blame concurrency for my headache? how many devs can cope with concurrency? how often do heads hurt? how much concurrency is there?
139. @hollycummins.com #Quarkus #IBM 𝖯 ( 𝖼𝗈 𝗇𝖼 𝗎 𝗋 𝗋𝖾 𝗇𝖼 𝗒 ∣ 𝗁 𝖾𝖺𝖽𝖺 𝖼𝗁𝖾 ) = 𝖯 ( 𝗁 𝖾 𝖺 𝖽 𝖺𝖼 𝗁𝖾 ∣ 𝖼𝗈𝗇 𝖼 𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) ⋅ 𝖯 ( 𝖼𝗈𝗇 𝖼𝗎𝗋𝗋 𝖾𝗇 𝖼𝗒 ) 𝖯 ( 𝗁 𝖾𝖺𝖽 𝖺 𝖼𝗁𝖾 ) can I blame concurrency for my headache? how many devs can cope with concurrency? how often do heads hurt? how much concurrency is there?
140. chip design electrical engineering 101
141. @hollycummins.com #Quarkus #IBM cores per cpu amd + intel sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/
142. @hollycummins.com #Quarkus #IBM cores per cpu amd + intel sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/ 1
143. @hollycummins.com #Quarkus #IBM cores per cpu amd + intel sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/ 1 2
144. @hollycummins.com #Quarkus #IBM cores per cpu amd + intel sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/ 1 2 48
145. @hollycummins.com #Quarkus #IBM cores per cpu amd + intel sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/ 1 2 48 128
146. @hollycummins.com #Quarkus #IBM sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/ 1 2 48 128 P(concurrency)
147. @hollycummins.com #Quarkus #IBM
148. @hollycummins.com #Quarkus #IBM why?
149. @hollycummins.com #Quarkus #IBM why? single-processor performance has plateaued
150. @hollycummins.com #Quarkus #IBM we have to get good at concurrency
151. @hollycummins.com #Quarkus #IBM but not all of us have to :)
152. @hollycummins.com #Quarkus #IBM strong foundations and clean abstractions : good outcomes with unskilled inputs
153. @hollycummins.com #Quarkus #IBM the quarkus team: P(headache | concurrency) < 0.10
154. @hollycummins.com #Quarkus #IBM 2022
155. @hollycummins.com #Quarkus #IBM 2022
156. @hollycummins.com #Quarkus #IBM 2022 people thought they had to do reactive programming
157. @hollycummins.com #Quarkus #IBM 2025
158. @hollycummins.com #Quarkus #IBM
159. @hollycummins.com #Quarkus #IBM language
160. @hollycummins.com #Quarkus #IBM language higher-level constructs
161. @hollycummins.com #Quarkus #IBM framework language higher-level constructs
162. @hollycummins.com #Quarkus #IBM framework fast reactive core … if it’s quarkus :) language higher-level constructs
163. @hollycummins.com #Quarkus #IBM framework fast reactive core … if it’s quarkus :) user code language higher-level constructs
164. @hollycummins.com #Quarkus #IBM framework fast reactive core … if it’s quarkus :) user code reactive programming model language higher-level constructs
165. @hollycummins.com #Quarkus #IBM framework fast reactive core … if it’s quarkus :) user code reactive programming model virtual threads language higher-level constructs
166. @hollycummins.com #Quarkus #IBM framework fast reactive core … if it’s quarkus :) user code reactive programming model virtual threads structured concurrency language higher-level constructs
167. why did green threads flop, and loom succeed?
168. @hollycummins.com #Quarkus #IBM sources: https://www.reddit.com/r/Amd/comments/6cu5ss/highest_amount_of_cores_per_cpu_amd_vs_intel_year/ and https://www.servethehome.com/amd-and-intel-2p-server-core-count-growth-2010-2022/ 1 2 48 128 why did green threads flop, and loom succeed?
169. why was AOT a bad idea, but GraalVM is a good one?
170. meteorology 101
171. meteorology 101
172. cloud meteorology 101
173. why is there all this hype, always?
174. business studies 101
175. venture capital business studies 101
176. @hollycummins.com #Quarkus #IBM
177. @hollycummins.com #Quarkus #IBM baby company
178. @hollycummins.com #Quarkus #IBM baby company
179. @hollycummins.com #Quarkus #IBM baby company
180. @hollycummins.com #Quarkus #IBM funding rounds baby company
181. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
182. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
183. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
184. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
185. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
186. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
187. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
188. @hollycummins.com #Quarkus #IBM funding rounds baby company attracted investment
189. @hollycummins.com #Quarkus #IBM “exit” funding rounds baby company attracted investment
190. @hollycummins.com #Quarkus #IBM “exit” funding rounds baby company IPO attracted investment
191. @hollycummins.com #Quarkus #IBM “exit” funding rounds baby company IPO acquisition attracted investment
192. @hollycummins.com #Quarkus #IBM “exit” funding rounds baby company IPO acquisition attracted investment
193. @hollycummins.com #Quarkus #IBM what attracts investment?
194. @hollycummins.com #Quarkus #IBM what attracts investment? stability?
195. @hollycummins.com #Quarkus #IBM what attracts investment? stability? profitability?
196. @hollycummins.com #Quarkus #IBM what attracts investment? stability? profitability? revenue?
197. @hollycummins.com #Quarkus #IBM what attracts investment? growth stability? profitability? revenue?
198. @hollycummins.com #Quarkus #IBM what attracts investment? growth stability? profitability? excitement revenue?
199. @hollycummins.com #Quarkus #IBM what attracts investment? growth stability? profitability? excitement revenue? likelihood of selling stake at a profit
200. @hollycummins.com #Quarkus #IBM “It’s not simply that one piece of technology is overhyped, it’s that hype is a necessary ingredient of the current business ecosystem of the tech industry.” – Meredith Whittaker, Signal
201. why can’t I find a job?
202. why can’t I find a new job?
203. @hollycummins.com #Quarkus #IBM
204. @hollycummins.com #Quarkus #IBM Source: indeed.com via https://newsletter.pragmaticengineer.com/p/software-engineering-job-openings?publication_id=458709 usa developer vacancies
205. @hollycummins.com #Quarkus #IBM Source: indeed.com via https://newsletter.pragmaticengineer.com/p/software-engineering-job-openings?publication_id=458709 uk developer vacancies
206. interest rates macroeconomics 101
207. @hollycummins.com #Quarkus #IBM ZIRP
208. @hollycummins.com #Quarkus #IBM ZIRP “zero interest-rate phenomenon”
209. @hollycummins.com #Quarkus #IBM 0%
210. @hollycummins.com #Quarkus #IBM <1%
211. @hollycummins.com #Quarkus #IBM Source: Bank of England UK interest rates
212. @hollycummins.com #Quarkus #IBM Source: Bank of England averting subprime collapse UK interest rates
213. @hollycummins.com #Quarkus #IBM Source: Bank of England averting subprime collapse covid UK interest rates
214. @hollycummins.com #Quarkus #IBM Source: Bank of England averting subprime collapse covid 0.1% (!) UK interest rates
215. @hollycummins.com #Quarkus #IBM Source: Bank of England averting subprime collapse covid 0.1% (!) in fl ation shortages war UK interest rates
216. @hollycummins.com #Quarkus #IBM Source: Bank of England UK interest rates
217. @hollycummins.com #Quarkus #IBM exit attracted investment baby company
218. @hollycummins.com #Quarkus #IBM exit attracted investment baby company
219. @hollycummins.com #Quarkus #IBM exit attracted investment baby company risk
220. @hollycummins.com #Quarkus #IBM ZIRP
221. @hollycummins.com #Quarkus #IBM software company ZIRP
222. @hollycummins.com #Quarkus #IBM government bond software company ZIRP
223. @hollycummins.com #Quarkus #IBM government bond risk return software company ZIRP
224. @hollycummins.com #Quarkus #IBM government bond risk return software company high ZIRP
225. @hollycummins.com #Quarkus #IBM government bond risk return software company high 20% - 500% ZIRP
226. @hollycummins.com #Quarkus #IBM government bond low risk return software company high 20% - 500% ZIRP
227. @hollycummins.com #Quarkus #IBM government bond low 0% risk return software company high 20% - 500% ZIRP
228. @hollycummins.com #Quarkus #IBM government bond low 0% risk return software company high 20% - 500% ZIRP
229. @hollycummins.com #Quarkus #IBM government bond low 4% risk return software company high 20% - 500% post-ZIRP
230. @hollycummins.com #Quarkus #IBM government bond low 4% risk return software company high 20% - 500% post-ZIRP
231. @hollycummins.com #Quarkus #IBM less investment means less hiring
232. @hollycummins.com #Quarkus #IBM less investment means less hiring
233. what about the ai-lephant in the room?
234. is AI killing jobs?
235. AI is attracting heavy investment exit hype generation
237. “our AI product is working”
239. “our AI strategy is working”
240. public relations 101
241. AI-washing
242. Photo credit: Blanca Garcia Gil
243. Photo credit: Blanca Garcia Gil
244. what attracts investment? growth stability? profitability? excitement revenue? likelihood of selling stake at a profit hiring
245. just because AI makes developers more productive, doesn’t mean it will reduce the number of developers
246. jevon’s paradox economics 101
247. @holly_cummins #Quarkus #IBM jevon’s paradox
248. @holly_cummins #Quarkus #IBM jevon’s paradox “efficiency improvements can lead to increased consumption”
249. @holly_cummins #Quarkus #IBM what we imagine when we widen roads
250. @holly_cummins #Quarkus #IBM what we get
251. @holly_cummins #Quarkus #IBM
252. @holly_cummins #Quarkus #IBM
253. @holly_cummins #Quarkus #IBM professions using ai worked 3.15 hours more per week https://cepr.org/voxeu/columns/ais-power-grows-so-does-our-workday
254. @hollycummins.com #Quarkus #IBM software is not going away
255. @hollycummins.com #Quarkus #IBM 1800s
256. @hollycummins.com #Quarkus #IBM “knocker-up” 1800s
257. @hollycummins.com #Quarkus #IBM “knocker-up” 1800s human alarm clock
258. @hollycummins.com #Quarkus #IBM “knocker-up” 1800s - 1940s human alarm clock
259. @hollycummins.com #Quarkus #IBM “knocker-up” 1800s finite demand - 1940s human alarm clock
260. @hollycummins.com #Quarkus #IBM “knocker-up” 1800s finite demand only employees need waking up - 1940s human alarm clock
261. @hollycummins.com #Quarkus #IBM “knocker-up” 1800s finite demand only employees need waking up no one needs waking up more than once - 1940s human alarm clock
262. @hollycummins.com #Quarkus #IBM the more software we have, the more we want
264. software to do stuff
265. software to do stuff software to do more stuff
266. software to do stuff software to do more stuff software to tell people about software
267. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software
268. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show
269. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software
270. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software
271. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software
272. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software software to write the software
273. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software software to write the software software to debug the vibe-coded software
274. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software software to write the software software to debug the vibe-coded software software to manage the software that writes the software
275. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software software to write the software software to debug the vibe-coded software software to manage the software that writes the software software to try and avoid skynet
276. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software software to write the software software to debug the vibe-coded software software to manage the software that writes the software software to try and avoid skynet software to work out the meaning of life
277. software to do stuff software to do more stuff software to tell people about software software to bypass advertisements in the software software to bypass the bypass software so ads still show software to gamify software software to monitor the software software to manage the software software to write the software software to debug the vibe-coded software software to manage the software that writes the software software to try and avoid skynet software to work out the meaning of life …
278. abstraction libraries frameworks
279. @hollycummins.com #Quarkus #IBM
280. @hollycummins.com #Quarkus #IBM Source: indeed.com via https://newsletter.pragmaticengineer.com/p/software-engineering-job-openings?publication_id=458709 usa developer vacancies
281. @hollycummins.com #Quarkus #IBM Source: indeed.com via https://newsletter.pragmaticengineer.com/p/software-engineering-job-openings?publication_id=458709 usa developer vacancies chatgpt released
282. Source: indeed.com via https://www.citadelsecurities.com/news-and-insights/2026-global-intelligence-crisis/
283. Source: indeed.com via https://www.citadelsecurities.com/news-and-insights/2026-global-intelligence-crisis/
284. @holly_cummins #Quarkus #IBM tl;dpa (too long; didn’t pay attention)
285. @holly_cummins #Quarkus #IBM tl;dpa ⁃ statistics is (annoyingly) important, especially bayes (too long; didn’t pay attention)
286. @holly_cummins #Quarkus #IBM tl;dpa ⁃ statistics is (annoyingly) important, especially bayes ⁃ to achieve more power, computers have to add more cores (too long; didn’t pay attention)
287. @holly_cummins #Quarkus #IBM tl;dpa ⁃ statistics is (annoyingly) important, especially bayes ⁃ to achieve more power, computers have to add more cores ⁃ software is not very good at taking advantage of these cores (too long; didn’t pay attention)
288. @holly_cummins #Quarkus #IBM tl;dpa ⁃ statistics is (annoyingly) important, especially bayes ⁃ to achieve more power, computers have to add more cores ⁃ software is not very good at taking advantage of these cores ⁃ the rise of interest rates means a tougher job market (too long; didn’t pay attention)
289. @holly_cummins #Quarkus #IBM tl;dpa ⁃ statistics is (annoyingly) important, especially bayes ⁃ to achieve more power, computers have to add more cores ⁃ software is not very good at taking advantage of these cores ⁃ the rise of interest rates means a tougher job market ⁃ jevon’s paradox means demand for software will go up even if ai makes producing software cheaper (too long; didn’t pay attention)
290. http://hollycummins.com/things-to-care-about-agile-manchester/