• Integrated a comprehensive observability system using OpenTelemetry, Loki, and Tempo. Established alert rules for VictoriaMetrics and set up alerting integrations with PagerDuty and Slack that reduced incident response time by 50%.• Fine-tuned observability approaches across the entire product, assisting other teams in integrating these solutions to ensure observability system consistency and efficiency. Having applied that, the whole incident management process has been improved on the product level by 50%.• Designed and implemented custom service metrics to monitor and enhance application performance and reliability. Thus, 25% of incidents were discovered & resolved thanks to having business specific metrics in place.• Enhanced the CI/CD pipeline by enabling GitLab cache and Docker cache, improving build efficiency and reducing deployment times by 10%.• Integrated a service for end-to-end testing support, keeping the traffic within the cluster and mocking responses from third-party services leading to overall testing costs cut by ~8%.

• Contributed to the successful release of the company's betting website within six months of joining. Was developing and deploying critical features.• Implemented integration testing system to ensure the reliability and stability of the product. Having achieved that, integration tests became a part of DoD, thus, test coverage level on each service has increased from 0% to 70+%.• Supported setting up and maintaining a new sports feed provisioning system, enabling real-time data updates and accurate betting information. Thus, reduced sports data retrieval latency by 15%.• Assisted in designing and executing queries in MongoDB to manage and retrieve sports feed data efficiently, optimising DB performance & memory usage by 10%.

• Created and maintained automated tests (Integration, Performance, Load) for full system testing purposes, reducing manual testing effort by 50%.• Defined, applied and managed QA standards and frameworks. Maintained detailed documentation for test plans, test cases, testing procedures as well as the product to ensure clarity and consistency in the QA operations. This has resulted in a 25% improvement in defect detection.• Performed manual testing for edge case scenarios & prepared a plan for automation of complex test cases, targeting a 25% reduction in manual testing efforts within six months.

• Worked with MS SQL;• Wrote API tests using nUnit; • Wrote UI tests using Selenium and SpecFlow;• Developed testing frameworks, Page Objects;• Created Check Lists, Test cases and Bug reports;• Completed Manual testing, etc.