Stmn, Inc. Engineering Deck: Culture, Tech Stack, and Our "Product Engineer" Mindset

Overview
This deck introduces the engineering team, culture, and technology strategy at Stmn, Inc., a rapidly growing SaaS company listed on the Tokyo Stock Exchange (Growth Market).

Our Mission
While the digital revolution transformed corporate offices, 60% of the workforce remains "Deskless." Our flagship product, TUNAG, bridges this digital divide, empowering frontline workers and strengthening organizational engagement across industries.

For Engineers
At Stmn, Inc., we don't just write code; we build businesses. We define our engineers as "Product Engineers"—builders who combine technical expertise with an entrepreneurial mindset to solve real user problems.

Highlights in this deck:
- Market Impact: Tackling the $600B "Deskless Worker" economy.
- Tech Stack: Pragmatic engineering using Ruby on Rails, Go, React, Next.js, and AWS.
- Architecture: A robust dual-engine structure (Product Engineering + Platform Engineering) designed for velocity and scale.
- Global Team: A diverse leadership team, including our VP of Engineering from India, driving world-class development standards.

We are looking for engineers who are ready to chase the ultimate velocity and build the future of engagement.

Locations: Tokyo & Nagoya, Japan
Website: https://stmn.co.jp/

Transcript

1. Company Deck for Engineers
2. 01 Our Overview 02 Mission / Vision / Values 03 Product 04 Engineering Team Contents
3. Our Overview 01
4. Our Journey to Date Our Overview 2016 Aug. Founded in Nagoya by three members and initiated development of our flagship product, "TUNAG." 2017 Jan. Opened a Tokyo office and launched "TUNAG" in Beta. Apr. Official launch of "TUNAG." 2018 Sep. Relocated the Tokyo office to accommodate expansion. Dec. Held the inaugural "TUNAG Engagement Award" (now an annual event). 2019 Jun. Awarded the Grand Prix at AWS Summit Tokyo “Startup Architecture of the Year 2019.” 2020 Feb. Ranked No.1 in the Tokai region in the "Great Place to Work" list for the first time. May. Launched the online community service "FANTS." Dec. Listed on the TSE Mothers market (currently TSE Growth). 2021 Apr. Relocated the Tokyo office to Kamakura to expand our footprint. Oct. Established STAGE Inc., operating the culture-centric recruitment agency "STAGE." カル チャー 重視 の 転 職 エー ジェント 2022 Mar. Expanded and relocated our Nagoya headquarters to a purpose-built, SDGs-oriented wooden office building. 2023 Jan. Established group company Stadium Inc. via a spin-off and transferred the FANTS business. Jan. Relocated the Tokyo office to WeWork KANDA SQUARE. Feb. Launched the cloud-based security service "Watchy". 2024 Jan. Transitioned to a dual-headquarters structure (Tokyo and Nagoya). Sep. "TUNAG" surpassed 1 million users. Nov. C orporate "TUNAG" customers exceeded 1,000 companies. 2025 Jan. Selected for the fifth consecutive year in the "Technology Fast 5 0 2024 J apan" ranking. Achi eved a publi c listi ng withi n j ust 4 years and 4 months of foundi ng. To accel erate f urth er growth, w e ex ecuted a corporate s pi n-off and ref resh ed our m anagem ent structure, enteri ng a renew ed growth ph as e f rom 2023 .
5. トップメッセージ CEO Message Tackling the Unanswerable Question of People and Organizations I started my career on an unconventional path—28 years old, unemployed, and back at my parents' house. It wasn't smooth sailing, but it taught me that the biggest challenges are overcome not by individual brilliance, but by the power of a united team. Today, we are tackling the profound and difficult question of how "People and Organizations" relate. It is a journey without a simple destination, but one we pursue with sincerity and dedication. We value passion over pedigree. A perfect background isn't required. I genuinely look forward to meeting new team members who are eager to embrace this ultimate challenge and build the future of our company. Representative Director & CEO, Stmn, Inc. Taihei Onishi Our Overview
6. Product & Technology Executive Leadership Our Overview Taihei Onishi Representative Director & CEO Taihei Onishi brings a unique blend of global scaling experience and multidisciplinary leadership. Before leading Stmn, he established an IT subsidiary in Vietnam from the ground up, growing it to a 200-person organization in just two years. As a founding director of Stmn, he not only steered the flagship "TUNAG" product but also orchestrated sales, dev, and finance strategies. Since becoming CEO in 2023, he continues to drive the company’s vision with a hands-on, holistic approach. Yash Murty Executive Officer, VP of Engineering, Global Development Yash Murty was a Division Leader at LY Corp, where he led the development of the LINE Premium product across Japan and international markets, managing global engineering teams and working closely with Japanese business stakeholders. Before LY Corp, Yash worked at Monstarlab Inc. on multiple Japanese projects from concept to launch. Originally from India, he is a graduate of IIT Madras and moved to Japan in 2017, where he has since developed strong experience in cross-border engineering and global team building. Tetsuya Sawada Executive Officer, VP of Technology Tetsuya Sawada has extensive experience in the web industry, having worked at NTT, Yahoo Japan, and GREE, where he was involved in the development and operation of portal sites, large-scale search systems, and game platforms. He has particularly deep expertise in search tecnologies, including significant experience collaborating with international teams and partners. After that, he joined several venture companies in fields such as voice technology and beauty tech, serving as CTO and division head, where he led service and product development. Takuya Noguchi Executive Officer, CTO Takuya Noguchi is a globally recognized technologist with over 20 years of experience in DX and SaaS development. Notably, he served on the GitLab Core Team, contributing to the product's evolution before its NASDAQ IPO, and was selected by GitHub as a sponsored global maintainer (top 900 worldwide). Since assuming the CTO role in 2024, he has spearheaded Stmn's technical strategy, elevating our engineering capabilities to world- class standards. Hiroshi Osada Executive Officer, CPO Hiroshi Osada is a veteran product leader with deep expertise in global expansion. At Monstarlab, he managed multi-million dollar projects and led growth across the APAC region as a Representative Director. He brought this wealth of experience to Stmn in 2024. As CPO, he is responsible for defining the product vision and driving the development roadmap to deliver world-class solutions. Yosuke Kamezaki Technical Advisory Board Member Yosuke Kamezaki joined V-CUBE, Inc in 2002, he worked on various digital content projects and developed the original web conferencing system, which was released as a service in 2004 and became the technical foundation of the company’s core business. He was appointed Executive Officer in 2007 and later became Director and CTO in 2012, leading global development teams, including those in Singapore, and driving the renewal of the company’s cloud infrastructure. In his current role since October 2025.
7. Mission / Vision / Values 02
8. Mission Inspire hearts, Spread happiness.
9. Mission / Vision / Values Delivering Inspiration: The Art of Exceeding Expectations The Definition of Inspiration Spreading Happiness to All Our commitment extends to three vital circles: 1. Society: Contributing to a better future and customer through every service we provide. 2. Our Employees: Ensuring Stmn is a place of joy, growth, and mutual respect for our team. 3. Our Supporters: Valuing every shareholder, partner, and family member who supports our vision. Satisfaction is meeting a standard. Inspiration is breaking through it. We believe that true value lies beyond the expected. We strive to be a company that spreads happiness not just through digital efficiency, but through emotional connection. We are obsessed with the quality of our process. We consciously choose the "uncompromising path"—embracing difficult challenges to deliver results that don't just satisfy, but deeply move our users.
10. Vision Win as One
11. Mission / Vision / Values Our Philosophy Alone, there are limits to what we can do. Together, there are none. We believe that a united organization can overcome any obstacle and aim for the highest peaks. At the heart of our growth is Engagement. It is the bond of trust that connects the company to its people, and our people to one another. This is why we are committed to investing in our people. We practice management that puts engagement at the center because we know that fueling the growth of our team is the surest way to grow our business.
12. Mission / Vision / Values Get Things Done Buff the Team More and Better Three Principles, One Culture. Every member at Stmn is guided by three core values. Our mission is to strengthen organizations, and we start with our own. By embodying the same "Strength of People and Organizations" that we deliver to our clients, we ensure that our actions always match our words. This authenticity is what defines us. Values Speed + Quality Be a Force Multiplier Own the Outcome
13. Great challenges only matter if you cross the finish line. We don't just "do tasks"; we own results. By taking responsibility until the very end, we build the momentum that propels the entire company forward. Don't just try to deliver. We fight as a squad. Your value isn't just your code or your sales numbers; it's how much you improve the stats of everyone around you. Support your team, share knowledge, and level up the team. Together, we are unstoppable. Fast isn't enough. Polite isn't enough. We want both. We don't just work harder; we work smarter by building systems and hacking processes. Combine speed with precision to maximize impact. Let’s build better, faster. Speed + Quality Be a Force Multiplier Own the Outcome
14. Product 03
15. Stmn Group Businesses Our portfolio consists of four synergistic businesses. We are an innovation engine, constantly developing new ventures to expand our impact. Product Unleashing Organizational Potential Operational DX Info Sharing Communication Training Vision Alignment Benefits TUNAG More than just an app—it’s an engagement operating system. We bridge the gap between management and employees to drive retention, productivity, and a unified culture. Essential Features, Custom-Fit for Your Business. Cloud Security Platform 設定 お知らせ 2022/6/24 12:54 新しいモジュールが追されました！ 2022/6/24 12:54 【復旧】プッシュ通知が一部届かない件について 2022/6/24 12:54 【 完了】シ ステムメンテナンスを実施しました 最新 のアラー ト 2022/6/24 12:54 キー ワー ド「請求書」を含むファイル を追 加しました 菊池 義勝 2022/6/24 12:54 キー ワー ド「請求書」を含むファイル を追 加しました 松下 三男 2022/6/24 12:54 外部 端末「USB」へファイル 「ホゲホゲ」を削しました 湯浅 れい や 2022/6/24 12:54 外部 端末「USB」へファイル 「ホゲホゲ」を削しました 湯浅 れい や 2022/6/24 12:54 外部 端末「USB」へファイル 「ホゲホゲ」を削しました 湯浅 れい や ライセンス利用状況 280 保有ライセンス数 280 利用ライセンス数 274 ファイル 監視 78 外部 端末監視 78 スクリー ン監視 78 ゴミ箱監視 40 空きライセンス数 6 チェッ カー 稼働状況 稼働チェッ カー 数 84 接続中 80 未接続 4 Screen Acti vit y Monitoring Har dware Asset Management USB De vice Control Soft ware Asset Management File & Fol der Acti vit y Monitoring We b Usage Monitoring User Session Monitoring Wa t chy Enterprise -grade IT asset and log management, made accessible for every business. Starting at an industry -disrupting 100 JPY/month to support SM Es everywhere. Building Fandoms 9:41 F ANTS The all -in -one platform for creators and brands to build thriving, enthusiastic communities with ease. Hirin g for Cu lture STAG E We believe s kills can be taught, but culture cannot. Our agency focuses on the perfect "Culture Fit " to build stronger, lasting teams.
16. TUNAG Employee Engagement Business
17. the Japanese market Product Desk Workers 42%​ Deskless Workers 58%​ Deskless Workers Approx. 39M People Total Addressable Market USD 600 billion Total Addressable Market USD 600 billion Source: Prepared by the Company based on "The Rise of the Deskless Workforce 2018" and "Number of Employed Persons by Occupation" by The Japan Institute for Labour Policy and Training (JILPT). Market Overview Empowering the Forgotten 60% The Deskless Workforce The Sleeping Giant
 The Urgent Need Our Mission They build, care, deliver, and serve. "Deskless Workers" make up nearly 60% of the workforce (39M people) and represent a staggering 600 Billion USD economy. Yet, this sector has been historically left behind by the digital revolution. The industry is at a breaking point—plagued by labor shortages and low productivity. The solution isn't just "more tech"; it's Engagement. Connecting these frontline employees to their organizations is the key to unlocking the next wave of economic growth. Stmn saw this Blue Ocean before anyone else. We built "TUNAG" to bridge the digital divide for the frontline. This is more than business; it is a socially significant mission to modernize the very foundation of our country.
18. Our Product Mission Product Source: Prepared by Stmn based on the "Survey on Employment Trends (First Half of 2023)" by the Ministry of Health, Labour and Welfare. The Reality The Cost of Churn The Turnaround 39 million people keep our society running, yet their workplaces are broken. The "Deskless" sector is trapped in a downward spiral of chronic understaffing and mass exodus. When people leave, culture dies. High turnover destroys team unity and kills the incentive to train new talent. The result? A paralyzed industry with stagnant productivity. We are here to stop this. We believe Engagement is the missing link. TUNAG uses technology to empower the frontline, transforming chaotic workplaces into united teams. We are fighting to build a world where every worker, at every site, feels valued. The Retention Gap Deskless industries face double the attrition of corporate roles. Frontline Jobs Critical Risk Over Higher Turnover 2x Accommodations & Food Services Lifestyle & Entertainment Services General Services (Ot her ) 10.9%​ 11.6%​ 14.8%​ Information & Comm unications Finance & Ins urance Researc h & Professional Services 4.4%​ 5.9%​ 6.0%​ Desk Workers Frontline Workers Ending the Engagement Crisis for the Frontline
19. Market Adoption & Track Record Proven Trust Since 2016 Since our founding in 2016, we have steadily built a reputation for reliability and results. Today, our platform is trusted by a rapidly expanding client base. Product Enterprise (1,000+ Employees) Mid-Market (100–999 Employees) Small Businesses (Under 100 Employees) 1,300+ Companies Active Clients 99%+ Retention Rate Customer Loyalty 1.5million+ Users Total Reach
20. Financial Highlights & Growth Strategy Revenue Trends and Future Goals Product 20,000 15,000 10,000 5,000 6​ FY2017 113​ FY2018 396​ FY2019 620​ FY2020 913​ FY2021 1,300​ FY2022 1,879​ FY2023 2,692 FY2024 FY2025 FY2026 FY2027 FY2028 FY2029 FY2030 +30% +56% +47% +42% +44% +43% +40% +40% +30% +30% +30% +40% +40% +40% +40% SURPASS VISION FY2028–2029 1 0 billion JPY 6x Growth in 5 Years: Revenue has surged from 620 million JPY in FY2020 (IPO year) to a projected 3.77 billion JPY in FY2025. High Growth Velocity: We have maintained a revenue ratio of over 140% versus the previous year (over +40% YoY growth) for 7 consecutive years. Mid-Term Strategy: FY2026 — Hitting 5 Billion JPY & Uplisting to Prime Targeting FY2026, our 10th anniversary, our immediate goal is to surpass 5 billion JPY in consolidated group revenue. While prioritizing this financial milestone, we are also looking ahead to the next stage of our growth: we are strategically preparing for a transfer from the current Growth Market to the TSE Prime Market to further elevate our corporate value. Track Record: Rapid & Sustained Growth Since listing on the TSE Growth Market in December 2020, Stmn, Inc. has demonstrated robust business expansion. over 5 Targrt billion JPY over 10 Targrt billion JPY
21. Engineering Team 04
22. Who We Are We Don't Just Write Code. We Technologist by Trade. Build Businesses. Entrepreneur at Heart. At Stmn, engineering is about more than specifications. It’s about creating value. We start with the "Why." We break down silos between dev, sales, and design to deliver the best possible product. Whether it’s solving a user’s pain point today or architecting the business model of tomorrow, we use technology as our catalyst to move the world forward. This is what it means to be a Stmn Product Engineer.
23. Speed is our currency. To deliver value to users faster than anyone else, our organization is built on a powerful dual engine: Product Development: The offense. Building features and creating the future. Platform Engineering: The foundation. Maximizing DevEx and keeping the system rock-solid. A Stmn "Product Engineer" is a master of both worlds—an entrepreneur who innovates boldly and a guardian who builds reliably. High DevEx fuels high speed. This flywheel effect drives our exponential growth. If you are ready to build fast and build right, join us. Let's chase the ultimate velocity together. Engineering Mission Delivering Product Value to Users with Maximum Velocity.
24. Tech Stack Pragmatic Engineering: Value Over Hype. Languages & Frameworks Infra & Ops How We Choose Our Tools At Stmn, we don't do "Resume Driven Development." We choose the right tool for the job. Our philosophy is simple: Leverage the power of tech to drive business impact. We stay on the cutting edge, but we don't blindly chase trends. Every tech choice is made with one goal—delivering the best possible experience to our users. Velocity: We rely on Ruby on Rails for our core. Why? Because it allows us to build fast, ship often, and maintain a stable foundation. Evolution: We aren't afraid to evolve. From Node.js and Next.js, Golang to integrating Generative AI, we flexibly adopt new technologies whenever they solve real problems and accelerate our growth. The Best of Both Worlds
25. Architecture Highlights Built for Scale: Our Polyglot Architecture Business Chat Infrastructure Image Delivery Pipeline AmazonS3 AmazonS3 Amazon CloudFront Application Load Balancer Amazon ECS Web Server Layer Amazon ECS Scheduled Tasks Amazon Eventbridge Amazon ECS Observability & Monitoring React /React Native Go Google Kubernetes Engine TUNAG Chat Engine (Microservice) CI / CD Pipeline GitHub GitHub Actions AWS CodeBuild Amazon ECR AWS CodeDeploy Amazon ElastiCach e Amazon Aurora Amazon O penSerch Service Amazon S3 Core Data Infrastructure Background J obs (Async) Static Content Delivery
26. Team Structure The Dual Engines of Our Growth We are organized to win. Our structure consists of two specialized teams working in unison: one focused on creating value, the other on maximizing velocity. Product Engineering Dept. The "Offense" — Driving Value Focused on shipping new features and solving user problems. They are the front line of our business growth, directly delivering impact to our customers. Platform Engineering Dept. The "Defense" — Empowering Builders Focused on SRE and DevEx. They don't just maintain stability; they build the runway that allows the product team to take off. Their mission is to create a frictionless environment where engineers can focus purely on creation. Project A Engineer Designer Project B Engineer Project C Engineer PdM PdM Designer DevEX SRE Engineering Project Product Engineering Dept. Platform Engineering Dept. Product Planning Dept.
27. Our Tech DNA Three Pillars of Our Engineering Philosophy 1 Unrivaled Data Assets Data is Our Moat With 1M+ users and a decade of insights, we hold the industry's most valuable dataset on employee engagement. We aren't just storing this data; we are transforming it into powerful AI solutions that will define the future of our product suite. 2 Pragmatic Architecture Built for Impact, Not Hype We choose the right tool for the job. We leverage Ruby on Rails for speed and stability, while deploying Go and microservices where performance is critical. We don't chase trends; we evolve our architecture strategically to ensure our tech stack always serves the business. 3 AI & Autonomy Empowering Every Builder We are an AI-first organization. By integrating AI into our workflows, we empower everyone—engineers and PdMs alike —to ship faster. We believe in breaking down silos; if you see a way to improve the product, you have the power and the tools to fix it yourself.
28. Our DNA What Makes Our Team Tick "Chat" is the Glue.
 Real Talk Starts with
 Real Connection. At Stmn, small talk is a big deal. We believe that psychological safety comes from knowing your team. Whether it’s a hobby club or a quick coffee chat, these moments build the trust needed for honest debates and high-speed collaboration. We don't use tech just to show off. We use Ruby on Rails strategically to move fast and break less. By choosing reliability over hype, we free ourselves to focus 100% on solving real user problems. Growth doesn't happen when you're comfortable. We push each other to try new things. Our managers act as coaches, helping you navigate your career path and ensuring you are always learning, always stretching, and never stagnant. One Team, One Goal. We Win Together. Your success is the team's success. We don't do silos. Everyone is encouraged to speak up and contribute ideas across projects. We are all "Business Owners," and we build this product together. We aren't a finished product yet - and that’s the best part. We have plenty of problems to solve, which means you have plenty of opportunities to lead. Don't just join a team; come build the ideal engineering organization with us. Imperfect is Exciting.
 Build the Future
 You Want. Break Your Boundaries.
 Li ve i n
 the Challenge Zone. Our Fi ve Core Values Engineering Culture Tech is the Tool , Value is the Goal.
 Code with Purpose.
29. Problem 01 Evolving Our Structure Problem 02 Deepening Observability Problem 03 Eliminating Knowledge Silos Problem 04 Balancing Reliability & Wellbeing We are never satisfied with the status quo. To build a stronger, more resilient organization, we are currently prioritizing the following four key initiatives. Our Next Level The Problems We Want You to Help Us Solve Our org chart isn't carved in stone. The relationship between Product and Platform teams is dynamic. We are looking for people who can help us architect not just code, but the organization itself as we scale. We are redesigning our on-call systems. We believe high reliability shouldn't come at the cost of burnout. We are seeking the ideal balance—robust uptime for users, and a healthy, sustainable life for our engineers. Great code shouldn't depend on one person's memory. We are building a "Playbook Culture" where knowledge is shared and documented. Our goal: scalable, high-quality engineering that doesn't rely on "heroes." We are taking monitoring to the next level. Using Datadog and modern telemetry, we are building a culture of deep analysis—moving from "reacting to alerts" to "understanding the pulse" of our services.