• Implemented 30% of integrations by connecting partners API, which increased monthly income to 26%. • Increased response time by 18% by refactoring code and optimizing queries to DB using JOINs. • Created interface to be used by partners which increased number of partners by 12%. • Wrote a Python script that will keep in sync ElasticSearch and MySQL, which decreased errors by 14%. • Migrated from ElasticSearch to ClickHouse by launching our own physical instances, which led company to save 9% of budget. Dealt with partitioning and indexing of data in ClickHouse. Provided statistics and metrics. • Managed to create test tasks, code review and interview new employees.

• Created web scrapers to get data from all travelling resources: planes tickets, hotels bookings, restaurants. • Developed whole architecture of Backend. • Created REST API for Frontend(Web, iOS, Android).

• Got +1M user information data from child companies by connecting to their API endpoints. Merged, grouped, aggregated data retrieved to provide statistics for C level management to plan future goals.

• Created a donation service interface that has been connected to +20 charity funds. • Implemented service that provide information by connecting to government services: electric, gas, water, which contributed to rising the amount of company's users by 20%.