— Worked in the Growth Monetization feature team, developing microservices using Golang, Kafka, PostgreSQL, and Clickhouse. Contributed to over 100+ microservices built with Golang and Node.js— Launched a new service in production using Golang for promotions within 1.5 months, writing business logic for promotion calculations and prize generation— Added new Kafka events for bet modifications or cancellations and wrote consumers in the analytics service to process and forward data to ClickHouse— Optimized raw SQL queries in PostgreSQL by adding indexes and using Common Table Expressions (CTEs)— Developed a proxy server from scratch that collected custom metrics and sent them to Grafana via Prometheus, and created new dashboards— Delivered a talk at an internal meetup and onboarded 2 mid-level developers— Managed Helm configurations and GitLab CI/CD pipelinesStack: Golang, PostgreSQL, Kafka, Redis, MongoDB, Clickhouse, Kubernetes, Docker, ELK, Grafana, Prometheus, Helm, gRPC, GitLab CI/CD

— Undertook a major refactoring of a legacy project (JS, CSS, BEM) to modern technologies (TS, Styled Components) and implemented a new version of MobX for client-side data management across various countries— Developed a Node.js proxy server to insert advertisements on pages and added analytics tracking through Amplitude.— Created interactive betting games using Pixi.js and Canvas with custom graphics— Developed complex game animations from scratch— Added new user data to JWT tokens— Mentored and onboarded 4 junior/mid-level developers— Automated dependency bundling in Webpack, which significantly improved debugging speedStack: TypeScript, Node.js, Express.js, Pixi.js, Redis, PostgreSQL, React, MobX, Webpack, Jest, Docker, TeamCity

— Developed an internal CRM for credit products (customer scoring, application approval).— Implemented responsive web page layouts using BEM methodology.— Developed 2 custom JS plugins for Team Foundation Server (to enhance convenience in logging personal work hours).— Added new components, such as a date-picker and paginated table, to the corporate UI kit and refactored existing components.— Wrote unit tests using Jest, increasing the test coverage of one module by 15%.— Configured CI/CD pipelines for services in Azure DevOps Services.Stack: JavaScript, TypeScript, Next.js, React, Redux, Jest, Webpack, HTML/CSS, JQuery, Azure DevOps Services