Valerii User

I’m a QA Engineer focused on delivering high-quality software through automation, back-end/API validation, and CI/CD reliability. I build end-to-end test suites with Cypress and Playwright, and I’m comfortable pairing API validation with structured test documentation.

At Yandex, I designed back-end test strategies for internal microservices serving 10M+ daily requests. I validated REST and gRPC APIs with Postman and custom Python scripts, and I performed database validation across PostgreSQL and ClickHouse to verify integrity and persistence.

I also brought measurable impact to quality workflows: I identified and documented 40+ cross-service defects with severity classification and root cause analysis, reducing average developer resolution time by 20%. By integrating Python-based tests into Jenkins pipelines, I reduced manual regression effort by ~35% and enabled automated nightly runs.

Beyond work, I maintain production-style automation projects—like a Cypress E2E suite that achieved a 100% pass rate across 25 automated cases and runs a cross-browser/cross-OS CI matrix via GitHub Actions. I enjoy shift-left testing and collaborate in Agile/Scrum to embed quality checkpoints into the delivery pipeline.