Tune performance, build notification system, migrate infrastructure from
Heroku to Amazon, writing API.
Developing medical assistant for cancer patients. Creating a system architect, design and develop db-structure, API-endpoints, deploy and maintenance web-servers, monitoring systems.
Created high-load backend for finance platform. Scrap, process and save a big amount of information every day, developed API, build automated deployment process.
Implemented questionnaire API, authentication with social login, built
business logic for processing users questionnaire's results, integrated payment gateways, third-party APIs.
Designed database structure for e-commerce platform, implemented logic for purchases, integrated with Stripe API.