Are you frustrated working with large, legacy and potentially lethal code bases? We were frustrated too, but in 4-5 years of time, we replaced A (front-end) and B (back-office) system with ~150 microservices. From the days of no tests and clumsy deployment process, we moved to each service with unit tests, CI and deploying with a bot. With the business buying in the process, we enabled the business to reach new heights. This talk reveals that journey and the things we learned along the way.

1. Moving from A and B to ~150 microservices,
the journey, and learnings
Geshan Manandhar
Senior Software Engineer (THE ICONIC)
@geshan

2. ◉ Senior Software Engineer
○ Tech solution provider
◉ Agile follower
◉ Conditional microservices believer
whoami

3. I am from Kathmandu, Nepal

4. I was working for a GFG venture in Middle East

5. Now I work at THE ICONIC

6. And I came here from the future, a future without legacy monoliths

7. Who ‘does not like’ working with legacy apps/monoliths?

8. What to expect from this talk?

10. What is microservices architecture?

11. “
“Microservice architectural style is an approach to developing a
single application as a suite of small services, each running in its
own process and communicating with lightweight mechanisms,
often an HTTP resource API. These services are built around
business capabilities and independently deployable by fully
automated deployment machinery”
- Martin Fowler
Source: https://martinfowler.com/articles/microservices.html

12. “
“Microservices is an architectural style that structures an
application as a collection of loosely coupled services, which
implement business capabilities. The microservice
architecture enables the continuous delivery/deployment of
large, complex applications. It also enables an organization to
evolve its technology stack”
- Chris Richardson
Source: http://microservices.io/

13. Microservices at Namshi

14. From 2 monoliths, to SOA (C) to Microservices, in past 4-5 years

15. Migrating to a REST based JSON API triggered a transformation

16. Stateless auth is a blessing, JWS in a cookie saved hassles.

17. A chunk of the backend is in PHP, other apps are built with NodeJs + Js

18. There are ~150 microservices at Namshi, with ~10 backend engineers

19. OMS
Studio (Prod)
Wallet
Shipments
Catalog
QC
Pick ItOrder
Exporter
WeBuyCart
Some of the microservices

20. Moving to microservices enabled to ship changes faster

21. Docker and kubernetes really helped to have a stable infrastructure

22. 9 out of 10 applications at Namshi are written in Node Js

23. Microservices != free lunch, lots of configs come with it

24. How to get started with Microservices

25. Start with an opportunity to extract out a business feature/function

26. Transform a pain point into a new service

27. Solve a small part of the issue, collaboratively. Roll out working software

28. Think out of the box, don’t code a microservice like a monolith

29. Feature flags and canary deployments keep us on the safe side

30. Key Takeaways

31. Requires inter team communication, business needs to buy into the idea

32. Replacing frontend can take ‘X’ months, back-office will take years

33. Design your systems with resilience in mind from the beginning

34. How small is micro? Yes, Your service can be of ~100 lines of your code

35. It is about speed and agility of software delivery

36. Questions welcome :)
You can find me at
◉ @geshan
◉ Geshan.com.np
◉ Slides:
Thanks!
Presentation template by SlidesCarnival

37. Credits/References
◉ https://pixabay.com/en/primate-ape-thinking-mimic-view-1019101/
◉ https://pixabay.com/en/running-sprint-cinder-track-498257/
◉ https://pixabay.com/en/stacked-stones-cairn-rock-balance-1007944/
◉ https://pixabay.com/en/lego-stones-build-toy-622602/
◉ https://pixabay.com/en/tractor-vehicles-farm-machinery-387275/
◉ https://pixabay.com/en/workplace-team-business-meeting-1245776/
◉ https://pixabay.com/en/network-server-system-2402637/
◉ https://pixabay.com/en/logs-wood-timber-lumber-woodpile-498538/
◉ https://pixabay.com/en/sunset-sea-the-sun-clouds-1603974/
◉ https://pixabay.com/en/change-arrows-clouds-sky-direction-948024/
◉ https://pixabay.com/en/cheetah-africa-namibia-cat-run-2859581/
◉ Kathmandu - https://pixabay.com/en/nepal-kathmandu-buddhism-pagodas-306621/
◉ https://pixabay.com/en/characters-shield-note-street-sign-3533352/
◉ https://www.flickr.com/photos/brianandjaclyn/4137335458
◉ https://pixabay.com/en/time-tiempo-count-day-future-699965/
◉ https://pixabay.com/en/doors-choices-choose-open-decision-1767563/