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SGCIB - Un CTO paie toujours ses dettes

SGCIB - Un CTO paie toujours ses dettes

Hervé LOURDIN

December 01, 2021
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  1. "UN CTO PAIE TOUJOURS SES DETTES." A Story of a

    Technical Refactoring led the Lean way with Product Mangement ! : @HERVELOURDIN - [email protected] 2 — Leboncoin - Videdressing © - 2021
  2. ▸ ex-CTO & Co-CEO chez Videdressing ▸ Engineering Director at

    Leboncoin since VD acquisition in 2018 ▸ Adepte et praticien Lean, Agiliste pragmatique ▸ Team Builder ▸ Ex Lean & Agile Partner chez @OCTOTechnology ▸ Co-founder of @Appal saStore 3 — Leboncoin - Videdressing © - 2021
  3. SAY HI TO JÉRÔME ! SENIOR PRODUCT MANAGER AT VIDEDRESSING

    4 — Leboncoin - Videdressing © - 2021
  4. A CTO always pays his debts. — T. Lanister 5

    — Leboncoin - Videdressing © - 2021
  5. DISCLAMER: THIS TALK IS NOT A TROLL ABOUT TECH. DEBT

    However, I do reco end to read about tech. debt, accidental compexity & software entropy. 6 — Leboncoin - Videdressing © - 2021
  6. LEAN / AGILE ORGANIZATION ▸ Product & Tech teams working

    on the same floor, 1 common spirit ▸ cross-functional team: PO, front & back developers, Designers ▸ iterative & incremental development: test fast, learn fast, improve ▸ 2 weeks scrumban iterations ▸ Release on the flow ▸ Stakeholders are integrated into projects 10 — Leboncoin - Videdressing © - 2021
  7. A SIMPLE PLUG N' PLAY PROJECT ABOUT A NEW MEAN

    OF PAYMENT 12 — Leboncoin - Videdressing © - 2021
  8. THE WAY WE LIKE TO SEE OUR PLATFORM 13 —

    Leboncoin - Videdressing © - 2021
  9. ... BUT THE plug n' Play PROJECT ...TURNED OUT TO

    BE A COMPLETE FAILURE 15 — Leboncoin - Videdressing © - 2021
  10. 3 - HOW TO COMMUNICATE ABOUT A REFACTORING PROJECT? 22

    — Leboncoin - Videdressing © - 2021
  11. HOW TO TELL TO A BOARD OF INVESTORS? (AND EXPLAIN)

    23 — Leboncoin - Videdressing © - 2021
  12. HOW TO TELL ABOUT TECHNICAL DEBT? ▸ Show the effects

    (the 4 horsemen wi help) ▸ Calculate and communicate the financial impact ▸ Come with a plan ▸ Design a business oriented plan 24 — Leboncoin - Videdressing © - 2021
  13. ▸ Trying to (re)understand how the machine is working 27

    — Leboncoin - Videdressing © - 2021
  14. FAILED AT TRYING TO GET THE TRUTH FROM THE CODE

    29 — Leboncoin - Videdressing © - 2021
  15. THIS PROCESS MAP WAS THE real first “release” OF THE

    PROJECT ... AND KILL SOME GOOD OLD MYTHS ABOUT HOW IT WAS MEANT TO WORK 33 — Leboncoin - Videdressing © - 2021
  16. ANALYSIS CONCLUSIONS Payment & Order system is our spine. Having

    a seamless customer experience from online to offline is a physiological need. We must address it in priority. AtoZ rebuild of our payment system & order lifecycle 34 — Leboncoin - Videdressing © - 2021
  17. THE HARD DECISIONS ▸ Stop or postpone other projects ▸

    Dedicated TaskForce for next 9 months ▸ No bug fixes on legacy anymore ▸ Accept to decrease the quality of service to improve it afterwards 35 — Leboncoin - Videdressing © - 2021
  18. EXPLAIN EXECUTIVE TEAM & STAKEHOLDERS WE WILL NOT RELEASE BIG

    FEATURE FOR THE NEXT 9 MONTHS 36 — Leboncoin - Videdressing © - 2021
  19. THE IDEA: PROGRESSIVE REPLACEMENT OF MEANS OF PAYMENT (MOP) FROM

    THE OLD PLATFORM TO THE NEW ONE 38 — Leboncoin - Videdressing © - 2021
  20. THE PLAN: DEPENDING ON THE BUSINESS IMPACT AND THE POTENTIAL

    RISK, WE PRIORITIZED THE MOP DEPLOYMENT BY PLATFORM 39 — Leboncoin - Videdressing © - 2021
  21. RELEASE THE LEAN WAY ▸ Slice for the fastest way

    in production ▸ Mitigate risks with Feature Toggles ▸ ... and Rollback ▸ Do not create all the tools day one (simple spreadsheet is ok) 40 — Leboncoin - Videdressing © - 2021
  22. THINK ABOUT FEATURE FLIPPING & “FEATURE CAPPING” AT THE BEGINNING

    OF THE PROJECT 42 — Leboncoin - Videdressing © - 2021
  23. 5 - MEANWHILE WITH THE TECH & PRODUCT TEAM 43

    — Leboncoin - Videdressing © - 2021
  24. CODE REVIEW, CODE REVIEW, NEVER SKIP CODE REVIEW 45 —

    Leboncoin - Videdressing © - 2021
  25. DEVOPS SUPPORT REQUIRED ▸ Fully Dockerized dev. environment ▸ Fresh

    dataset automation ▸ Keep syncing with master branch whenever you can ▸ Deploy on a testable feature branch ▸ Release ASAP & often 46 — Leboncoin - Videdressing © - 2021
  26. THE LEGACY ROOMATE ▸ Do not f d the monster

    ▸ Starve the monster whenever it's possible ▸ Separate bundles in the new platform ▸ Make the new services more desireable than the easy (dark) one 47 — Leboncoin - Videdressing © - 2021
  27. RESULTS ▸ 100% of orders are now processed on the

    new system ▸ bug (almost) free ▸ easy to track/reconciliate ▸ -20% on Customer Care contact rate 49 — Leboncoin - Videdressing © - 2021
  28. RESULTS ▸ Enabler for Mobile platforms better performance ▸ From

    40% to 55% of mobile contribution in sales ▸ The user/order lifecyle is now readable, not only by developers 50 — Leboncoin - Videdressing © - 2021
  29. MISTAKES ▸ Postponing information to board/exec team on platform state

    ▸ Took too much time to decide the refactoring ▸ Spent too much energy to solve bugs instead rebuilding ▸ No unified & shared documentation on business process ▸ Stakeholders not enough involved & informed once the project was launched 51 — Leboncoin - Videdressing © - 2021
  30. OTHER LEARNINGS ▸ The monster will not die before long

    ▸ But you can "contain" it ▸ Mob(ish) programming is cool for tricky design phase ▸ Never skip code reviews 52 — Leboncoin - Videdressing © - 2021
  31. SOURCES : - http://s1.lprs1.fr/images/2017/03/27/6800478_606918fc-12e9-11e7-9021-d8ba8fcbd319-1_1000x625.jpg - http://static.mensup.fr/photo_article/138906/17843/1200-L-game-of-thrones-saison-7.jpg - https://lh4.ggpht.com/eEAf4qsZ--nWq3LY1r9JcwgHfdmErHaXdhCFn7DCIGwiprJQzMiXX57GW2I0nKdyZQ=h900 - https://vignette4.wikia.nocookie.net/gameofthrones/images/f/f5/The_Wall.jpg/revision/latest?cb=20150323200738

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