Taavet Tamm, Senior Dev, Fortumo: "“Startup - it’s not just an IT project” - a random sampling of problems we’ve faced so far."

2. Decisions of Software
Evolution

3. Taavet Tamm, a developer,
nice to meet you.

4. Let’s get right into the following
● Couple of real-world examples
● The abstract of software decisions

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We need to make some decisions

6. Lets build the second application
● RubyOnRails
○ it fits the team
○ matches what we’ve built before
○ can we deliver fast
● Mongo
○ Fits the features of the app

7. Lets build an app number xx
● NodeJS
○ Fits the features
○ Performs well
○ Encourages modular approaches
● DynamoDB
○ Easy to scale
○ Performance

8. Differences
● Old app is easy to kill and compicated to recover
● New app is happily serving 2000 request/second

9. Microservices
● RabbitMq
● Java

10. RabbitMq - A message queue
● Asynchronous communication
● Event based communication
● Persistent communication
● Configurability for future
● Proven track record
● Clients for several languages

11. We chose Java over Ruby
● Can it fit on a cheapest amazon node
● Can it provide fast response time
● Is the ecosystem mature
● Can we build apis in it
● Is it evolving or revolutionary

12. ● JVM - predictable, performant
● Fundamentals - threads, objects, annotations
● Tooling - IDE, javadoc, debugging, code generation
● Lightweight enough (jetty)
● Easy to abstract and extract libraries
● Load tests are good enough

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The evolution

14. Less building more maintaining
● Scaling
● Maintaining infrastructure
● Reworking previous features
● Working around past mistakes

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Conway’s law

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Application continuum

17. Conclusion
● App evolves with the company
● Rewriting and maintaining things takes time
● Day to day environment influences applications
more than features

18. Questions?