Backend Engineer

I have delivered backend solutions for multiple NDA projects, including high-load systems, microservices, multiplayer applications, educational platforms, CRM systems, and financial products.

I work primarily with NestJS, Node.js, TypeScript, PostgreSQL, MongoDB, and related infrastructure, contributing to architecture, API development, integrations, database optimization, monitoring, and production reliability.

I designed and maintained microservice architecture for a large international taxi service system operating across more than 50 branches in different countries. Following the production launch, I continued supporting the system as a Technical Consultant.

I used NestJS, TypeScript, PostgreSQL, Prisma, AWS, Valhalla, Nominatim, Prometheus, Elasticsearch, and Kibana. My work included mapping integrations for routing and geocoding, payment system integrations, database optimization, scalability improvements, monitoring, and analytics.

I developed the backend for a spiritual services platform offering online consultations, sessions, bookings, and related services. I built the server-side architecture using NestJS, Prisma, and PostgreSQL.

I designed and implemented REST APIs for user management, booking workflows, service catalogs, and real-time notifications.

I developed backend functionality for one of the first large Ukrainian GTA V roleplay servers. I initially collaborated with two backend developers and later continued development independently.

Using Node.js, AltV, and MongoDB, I implemented multiplayer game features, chats, player interactions, real-time events, matchmaking APIs, account management, and live communication systems. I also designed event-based architecture and optimized performance for thousands of concurrent users.

I participated in backend development for an educational platform similar to Mate Academy and GoIT. I developed server-side functionality using NestJS, Node.js, and PostgreSQL.

I built APIs for course, user, and progress management, and integrated analytics and notifications to support student engagement.

I developed and maintained backend services for a CRM system used by marketing companies. I implemented user management, role-based access control, and access rights management.

I designed REST and GraphQL APIs for dashboards and integrations, optimized PostgreSQL and MongoDB operations, and integrated Binom postbacks.

I delivered full-cycle backend, API architecture, and database development for financial systems, taking projects from documentation through production. The platform supported financial institution branch management, exchange systems, and accounting processes.

I designed microservice architecture for billing, invoicing, and reporting using NestJS, Node.js, and PostgreSQL. I also contributed to security and data protection compliance, CI/CD pipelines, and system reliability improvements.