Zalando Tech: From Java to Scala in Less Than Three Months
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Zalando's Alexander Kops (Delivery Lead, Brand Solutions) presented this talk for the Bern and Zurich Java Users Groups in November 2015.
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Zalando Tech: From Java to Scala in Less Than Three Months
- 1. From Java to Scala in Less Than Three Months
- 2. Alexander Kops Started at Zalando in 2010 Delivery Lead, Brand Solutions
- 3. 15 countries 3 fulfillment centers 16+ million active customers 2.2+ billion € revenue 2014 130+ million visits per month 10.000+ employees, ~900 in tech Zalando at a Glance Visit us: tech.zalando.com
- 4. Legacy Tech Stack 2008 - 2010
- 5. Legacy Tech Stack Complete rebuild in 2010
- 8. Rules of P lay Microservices REST APIs API First SaaS principle Cloud: Build on top of AWS
- 9. Brand Solutions Formed in 2014 Creating a CMS for our fashion brands Uploading their own content to the Zalando shop Five teams, 50+ people
- 10. My Team’s Challenge Build new analytics product Gather + compute data from different sources Potential future growth Work with legacy applications Be ready for cloud deployment
- 11. Why we chose Scala Experience with the JVM Works well with Java libraries Mature ecosystem Backed by Typesafe Functional programming good for parallelization
- 12. Why we chose Play Intuitive to use Excellent performance Extensibility Backed by Typesafe
- 13. Scala: the Good Parts
- 14. Concise
- 15. Combines FP and OOP
- 18. Great DSLs for testing
- 19. Scala: the bad parts
- 20. Compilation times Advanced language features add to compile time scalac -Xshow-phases But sbt’s incremental compilation helps!
- 21. Language problems The same thing can be written in many different ways No canonical style guide Allows “operator overloading” FP code can get unreadable
- 23. Steep learning curve New language Functional programming concepts New frameworks New build tool
- 24. Helping the transition Assume 3-4 weeks overhead Two weeks exclusively for learning Encourage study groups Bring in freelancers Incremental learning OO -> FP
- 25. Provide material
- 26. Fitting projects Prototypes Greenfield projects Modular projects: Layered approach
- 27. Two types of Scala converts Using Scala as Java Functional programming hipsters
- 28. About coding style Develop own or embrace existing style guide Pair programming and code reviews Strict compiler settings
- 29. Tooling IntelliJ > Eclipse IDE sbt provides benefits over Maven and Gradle
- 30. Hiring Scala developers Genuine Scala developers are rare Senior Java developers eager to learn Scala Provide internal trainings Spread the word that you are doing Scala
- 31. Our application
- 32. Typesafe Stack in Zalando 40% of engineers want to learn Scala >12 teams are developing in Play and Scala >40 engineers Four Typesafe-certified Scala and Play trainers in-house
- 33. Other applications Merchant Center Fraud analysis Stylist website A/B testing tool Payment services
- 34. Play-Swagger “API First” library for Play Developed in-house by two engineers Collaboration with Typesafe’s James Roper https://github.com/zalando/play-swagger
- 35. Follow us Tech Blog: tech.zalando.com GitHub: github.com/zalando Twitter: @ZalandoTech Instagram: zalandotech