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Clean Architecture on the Backend: Data Flow
How does data flow through the system?
 • 
Valentina Jemuović
2
Superstar Developer is your greatest risk
Does delivery stop when someone’s out of office?
 • 
Valentina Jemuović
2
TDD in Legacy Code - Component Tests - Backend
How can Backend & Frontend teams get isolated feedback whether their part works, without waiting for the slow Acceptance Tests?
 • 
Valentina Jemuović
6
TDD is NOT about high code coverage
Code Coverage shows you what you haven't tested, not how good your tests are
 • 
Valentina Jemuović
2
Technical Debt
The hidden cost of copy-paste code
 • 
Valentina Jemuović
16
Hexagonal Architecture - Internal World (The "inside")
Our system core logic shouldn’t be affected by anything external
 • 
Valentina Jemuović
2
TDD: 1 unit test ≠ 1 class
TDD misconception: The class is the unit of isolation. That's wrong! Instead, the behavior is the unit of isolation.
 • 
Valentina Jemuović
6

September 2025

ATDD: Don’t skip tests even for simple code
Learning the hard way: even “simple” code needs tests. Automated testing isn't just for big complex projects.
 • 
Valentina Jemuović
6
Why Unit Tests & E2E Tests don’t protect us in production
Watch now | Why do many test automation initiatives fail in reducing regression bugs?
 • 
Valentina Jemuović
2
1:37:14
From Unit Tests to Acceptance Tests - Why I shifted my focus?
I focused on HA & TDD for years. Why I shifted my focus to ATDD?
 • 
Valentina Jemuović
4
99% of devs think they practice CI — they don’t.
CI isn’t just having a pipeline. If you're not practicing TBD and don't have tests, then you are not practicing CI.
 • 
Valentina Jemuović
2
How to introduce ATDD in Legacy Code? (in 3 months)
You should stay with your Big Ball of Mud, and stay with your Messy Code. I'll explain why and what you can do instead.
 • 
Valentina Jemuović
2
© 2025 Valentina Jemuović, Optivem
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