Zero-Flakiness Distributed Test Execution Engine

Head of Automation / Tech Lead · 2024 - Present

Platform & Infrastructure2024 - Present

Designed and implemented a containerized, parallel test execution engine from scratch, reducing regression feedback loops from 4 hours to 18 minutes.

⚡92% reduction in pipeline feedback times
⚡$120k/yr saved in CI worker compute costs
⚡100% test isolation across 14 squad pipelines
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Situation & Problem Scope

Prior to this initiative, automated regression suites ran sequentially in a monolithic CI pipeline. Flaky browser state caused false negatives on 23% of runs, requiring manual developer restarts and delaying daily deployments.

Strategic Leadership & Team Impact

  • Cross-Squad Alignment: Standardized quality contracts across 14 independent engineering squads without disrupting feature delivery schedules.
  • Mentorship: Conducted architecture workshops for senior engineers, shifting automated test authoring directly into sprint workflows.

Technical Architecture

The platform dynamically shards test suites across isolated ephemeral Docker containers, coordinating state back to a centralized HTTP API endpoint.

Dynamic Sharding Algorithm

  1. Historical Execution Profiling: Test durations are queried from SQLite at runtime.
  2. Bin-Packing Distribution: The runner allocates specs across parallel workers to ensure even execution runtime across nodes.