Design and development of a headless CMS SaaS solution covering all of the requirements of a modern web or mobile app.

Lead the development of a large-scale web application including a distributed microservice backend, web, and mobile user apps.

Developed apps (front and back-end) for an embedded digital signage solution. Backends (used for OAuth passthrough, data extraction and transformation, user management, etc.) were developed as REST APIs using Python (Flask) or Node (express) deployed to AWS Lambda. Frontends were developed in React with CSS optimized to run on embedded devices.

Leading the design and development of a comprehensive credit card management solution covering all included processes (card issuing, acquiring, transaction processing, settlement, risk and limit management, etc.) for Visa, Mastercard, Maestro, and Diners Club credit card brands. Designing and running a no-downtime migration from the old banking system to the newly deployed one.

Developed the monitoring solution providing real-time stock trading data to subscribers. The system was developed as a distributed multi-server backend feeding the data from the stock exchange system with a custom load balancer and a desktop user application.