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Worked in a dedicated backend team of two developers within a larger multi-team initiative, building an MVP analytics platform for budgeting and expense tracking based on transaction data. Designed and implemented REST APIs and PostgreSQL schemas from scratch. Built backend services to categorize user transactions and generate personal finance statistics. Coordinated API design with mobile team and maintained Swagger documentation. Wrote component and end-to-end tests to validate transaction parsing and aggregation flows. Took part in architecture discussions and internal tooling improvements. Delivered MVP on schedule before the project was terminated due to external geopolitical factors.

Took over and stabilized a complex backend system previously started by another vendor. Developed new services and database structures to support routing, locomotive and wagon management. Migrated large volumes of CSV data into Oracle DB using optimized JDBC pipelines. Wrote and tuned SQL queries, introduced indexes to significantly improve slow reports and searches. Migrated build system from Ant to Gradle with full dependency and script conversion. Suggested and implemented internal process improvements in bug reporting and task tracking.

Developed a middleware backend that connected the bank’s core services with the mobile frontend for SPB Bank. Designed the database schema and implemented performant SQL queries. Maintained production server; handled urgent fixes during off-hours, including critical night releases. Refactored push notification logic to improve delivery reliability. Implemented API versioning to support multiple app versions. Mentored a junior developer: helped with DB documentation and mobile-focused endpoints. For LUKOIL, built geo-query logic for dynamic in-app recommendations (e.g., nearby promotions). Optimized DB access patterns with caching and selective indexing. Participated in late-night releases and urgent production fixes. Communicated directly with the client to clarify requirements and deliver updates. Contributed to a production MVP that served 100k+ users.

Developed core backend features and database models from scratch for a startup game project (multiplayer shooter in a sci-fi setting). Migrated data and logic from MySQL to PostgreSQL. Designed schema and logic for clan management system. Wrote unit and integration tests for key game mechanics.