How A/B Testing can ruin your codebase | Swift Heroes 2025

⏩ Chapter:
00:00
03:34 Code complexity
08:14 Cleaning up finished experiments
09:06 Experiment-Induced Damage
10:33 Data corruption & loss
12:29 Testing complexity
15:17 Share state can be non-obvious
16:40 Advice on Unit Testing from Optimizely
19:01 Debugging complexity
21:29 Developer Experience
26:41 Use Experience
29:18 A/B Testing tends to be short-sighted

A/B Testing: The Unexpected Engineering Nightmare exposes the rarely discussed but critical impact A/B tests can have on code quality, team productivity, and long-term maintainability. In this talk from Swift Heroes 2025, iOS Engineer Anastasia Petrova dives into real-world examples of how A/B testing, when mismanaged, can lead to code complexity, data corruption, and testing hell.

From debugging unpredictability to compromised user experiences, this session walks through the hidden costs of experimentation and offers strategies to mitigate damage. You’ll learn how to clean up test code, respect user consent, avoid shared state chaos, and maintain a healthy development process without sacrificing data-driven insights.

If you're running A/B tests—or planning to—this talk is essential viewing. Avoid the trap of short-term wins that lead to long-term technical debt. Watch now and build smarter, not messier.
🎤 ANASTASIA PETROVA, iOS Engineer

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