RedefiningValueThroughInternalCrossDepartmentSideProjects.pdf

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1. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. Susumu Tomita 2025/6/6 Redefining Value Through Internal Cross-Department Side Projects DevOps Practices that Shrink Lead Time from 1 Month to 10 Minutes
2. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 2 冨田 進 Susumu Tomita Software Engineer, Cloud Center of Excellence (CCoE) team Working on DENSO since 2018 Currently building web services and driving cloud best-practices internally Self Introduction
3. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 3 1. Introduction 2. Cross-Boundary Challenge and the Fresh Perspective 3. Redefining Product Value with VSM 4. Building an Almost Zero-Maintenance Architecture 5. Lessons: Cut Lead Time from 1 Month to 10 Minutes Agenda
4. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. 4 Introduction Why I Started a Cross-Boundary Challenge Project 1 DevOpsDays Taipei 2025
5. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 5 • 5 h / week · cross-team cloud guild • Peer training → AWS Security · Terraform · Cost Optimization · CI/CD • Real results → better security, lower cost, faster delivery Terrakoya - Trigger for My Cross-Boundary Challenge
6. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 6 • No in-house engineers now • Need to grow talent & culture • Terrakoya time too short • Use Cross-Boundary Challenge for hands-on answers Manager’s Question: Engineering Team
7. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 7 • Use up to 20 % of work hours to help another team • No transfer of home role • A company-wide program • Focus areas: Cloud / Data & BI / Citizen-apps / Data & AI What is Cross-Boundary Challenge?
8. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. 8 Cross-Boundary Challenge and the Fresh Perspective 2 DevOpsDays Taipei 2025
9. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 9 Pain: • Small change, but it can take up to 1 month Problem: • SaaS setting changes take a long time • Release depends on a partner → only once per month Goal: • Build a web app to automate the whole flow • Bring release work in-house (no partner) Goal When Starting the Cross-Boundary Challenge
10. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 10 • System overview unclear • Roles unclear (who owns what) • Scope & release flow undefined • Team just formed → need one shared process map Fresh Perspective: First Findings
11. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 11 Draw system context map • Show boundaries List stakeholders • Who owns what • Stakeholders set feature priority Meet every 2 weeks • Gather feedback • Update priorities → improve System Context Map & Feedback Loop
12. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 12 • Post updates in chat • Write retro notes in threads • Do casual talk async too • Retrospectives Making the Team Work
13. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 13 • No “wow” reaction • Only small UI comments • Few words about real user experience • Review felt flat → just “a new tool” First Demo Feedback
14. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 14 • Moving tasks to web didn’t cut user workload • A new tool means new things to learn • If we keep going “as is,” we give some value but not a product users love • We stepped back and re-defined the problem Insights After the First Demo
15. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. 15 Redefining Product Value with VSM 3 DevOpsDays Taipei 2025
16. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 16 • Draw the whole flow with a Value Stream Map (VSM) • Invite all stakeholders—approvers, managers, team leads • Write down work time, wait time, total lead time • Log rework loops → spot true improvement points Find Bottlenecks to See Real Value
17. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 17 • Super-long, scroll-like flow • Everyone understood the entire flow • Wait times of 1 week to 2 months Our Value Stream Map
18. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 18 1. Request by phone / email 2. Sales team writes a ticket 3. Send to outside partner → wait for approval & release 4. Go live Total: about 1 week – 1 month Current Flow – Main Steps
19. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 19 • Setting-update step = big bottleneck • Approval, ticket creation, assignment = bottlenecks too • Fixing one step is not enough → need end-to-end improvements • Optimise the whole flow → product value becomes clear Key Findings from the VSM
20. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 20 • ECRS • Trim steps, merge similar ones, reorder flow • Expand scope • Optimise the whole flow • Update elevator pitch • Update user-story map • Result • Clear next actions Redefine Product Value
21. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 21 • Ideal VSM → find wait-time cut points • Rebuild full flow (now includes city-office inquiries) • Update elevator pitch → covers end-to-end work Ideal VSM & New Elevator Pitch
22. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. 22 Building an Almost Zero-Maintenance Architecture 4 DevOpsDays Taipei 2025
23. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 23 • Pick the top lead-time cut feature • Build a simple HTML page in one day • Link customer requests to exact product settings • Change Complete in about 10 min total Big Impact from a 1-Day Prototype
24. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 24 • Step-by-step • Parameters auto-fill placeholders • Follow the steps → change complete The One-Page Demo We Showed
25. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 25 • One-page demo proved the idea, so we pivoted • The idea: zero cost architecture • No traffic = zero cost • No server patching needed • Implemented Google Form + AWS Lambda Simple, Serverless Architecture
26. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 26 • Short narrative script • Value at a glance • Clear goals Getting Better Feedback
27. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 27 Automate ticketing • Full step list generated for each request AI-assisted parameter step • Operator prompts AI to generate the JSON What We Finally Built
28. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 28 One TypeScript repo • Clasp for Google Apps Script, CDK for AWS infrastructure AI coding • Cline + Copilot chat → quick AI pair-coding Rich test cases • Tests describe expected behavior → results are easy-to-read specs Under-the-Hood Dev Setup
29. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 29 Test Code Execution Result • Each test lists the exact resources to create • Test run shows how many resources are created Test Code Example
30. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. 30 Lessons: Cut Lead Time from 1 Month to 10 Minutes 5 DevOpsDays Taipei 2025
31. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 31 Before 1. Request by phone / email 2. Sales team writes a ticket 3. Send to outside partner → wait for approval & release 4. Go live Total: about 1 week – 1 month Lead Time: 1 Month to 10 Minutes
32. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 32 After 1. User fills a form 2. Auto-workflow makes the step list & ticket instantly 3. Operator follows the steps, change goes live Total: ~10 minutes Lead Time: 1 Month to 10 Minutes
33. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 33 • Look at the whole flow, not each silo (VSM is a strong tool) • Doing beats knowing – practice builds real skill • Share what you know → grow engineering culture What I learned
34. CONFIDENTIAL CONFIDENTIAL PUBLIC © DENSO CORPORATION All Rights Reserved. DevOpsDays Taipei 2025 34 • Soft-skill wins • Problem-solving • Facilitation • Cross-team communication • Technical practice • Hands-on TDD, CI/CD, IaC experience • From theory to practice • Real design & architecture lessons What the Host Team Learned Together