Senior Backend / Golang Engineer

I integrate external services and LLM providers into an AI product backend built with Go, Modulus, Uber FX, SQLc, gqlgen, GraphQL, and PostgreSQL. I optimize provider routing and model usage, reducing LLM API costs by more than 50%.

I build payment and subscription workflows with Temporal, including payment provider integrations, user payment flows, and subscription lifecycle management. I also integrate MCP servers, analytics, and messaging services, while partnering with customer support to investigate issues and create actionable engineering tasks.

I led the end-to-end migration of a live trading platform from a legacy PHP monolith to idiomatic Go microservices, preserving full API backward compatibility with no trading disruption. I designed in-memory state management, caching layers, and fine-grained locking that reduced core trading latency from 2,000ms to 5ms and scaled order creation to more than 10,000 write RPS.

I profiled hot paths with pprof and removed CPU and allocation bottlenecks in the trading engine. I also built trade data, logging ingestion, and payment services; designed data pipelines for datasets exceeding 1 TB; integrated systems through gRPC and Kafka; and contributed to anti-fraud systems.

I built scalable backend infrastructure for an NFT marketplace and an internal cryptocurrency economy. I developed REST and GraphQL APIs for high-volume media delivery using Go and PHP.

I implemented authentication, payment, and notification microservices. I also wrote unit and integration tests, participated in code reviews, and worked with CI/CD pipelines.

I developed a freight management platform with real-time tracking powered by Socket.IO. I built a complex reporting engine and stateful user interface using Angular and NgRx.

I maintained Node.js and MongoDB backend services. I also mentored junior developers and conducted regular code reviews.

I developed a secure LegalTech document management platform. The platform included digital signature capabilities and smart contract integrations.

I worked across PHP services built with Laravel and Lumen, Vue.js frontend components, PostgreSQL, RabbitMQ, Docker, and GCP infrastructure.

I built a tariff selection engine for the German electricity market. The system processed large pricing datasets to support tariff comparison and selection workflows.

I used PHP with Laravel and Lumen, MySQL, GitLab, and Docker to deliver and maintain the application.

I created a plugin-based product import engine for high-volume CMS data synchronization. The solution supported extensible data import and transformation workflows.

I worked with PHP, FatFree, AngularJS, MySQL, Bitbucket, and Docker.

I built backend services for a virtual fitting room product. I integrated 3D processing workflows through RabbitMQ.

I worked with PHP using Zend Framework 2, AngularJS, PostgreSQL, RabbitMQ, GitLab, and Docker.

I optimized a travel search platform serving approximately 35,000 daily active users and contributing more than 50% of company revenue. My work focused on improving the reliability and performance of the platform.

I mentored junior developers and contributed to team development practices. The technology stack included PHP with Zend Framework, AngularJS, PostgreSQL, MySQL, SVN, and Docker.

I engineered a news aggregator that handled more than 50,000 daily users. I also developed e-commerce and photo-bank platforms.

I worked with PHP, Joomla, WordPress, OpenCart, JavaScript, MySQL, and SVN.

Specialist Degree in Information Technology, completed in Zhytomyr, Ukraine.

Specialist Degree in Software Development, completed in Zhytomyr, Ukraine.