Contact information

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Work experience

Backend / WEB3 engeneer

from 01.2026 to 03.2026 (3 months)
Loka, Дистанційно (IT)

Stack: NestJS, PostgreSQL, MinIO, ELK stack, Ton Blockchain, Tolk, Blueprint/Jest, SumSub, Next.js

Higlights:
• Designed and tested smart contracts for a TON decentralized escrow system using Factory-Child patterns to manage USDT Jetton security deposits and automated rental payment workflows.
• Integrated KYC/AML verification via SumSub, including access token generation and webhook handling for user verification status synchronization.
• Integrated third-party services including including MinIO (S3) file upload workflows for listings and OpenStreetMap integration for property geolocation lookup.
• Implemented automated document generation workflows, populating contract templates with verified user data and converting generated DOCX documents to PDF format.
• Configured Pino structured logging and set up a local mocking environment to test Telegram Mini App flows directly in the browser during development.

Backend developer

from 06.2025 to 01.2026 (8 months)
Freelance, Дистанційно (IT)

• Developed and integrated RESTful API features using Node.js (Express.js & NestJS).
• Implemented Sentry for automated error tracking and performance monitoring
• Configured logging with ELK stack
• Developed custom Telegram bots from scratch, handling everything from basic automation
to complex integrations with the Telegram API
• Provided technical support to clients by identifying and resolving system errors.
• Integrated different third-party APIs to Node.js app

Backend developer

from 11.2024 to 06.2025 (8 months)
Traff Group, Дистанційно (IT)

Stack: Node.js, TypeScript, NestJS, Express.js, MongoDB, MariaDB, ClickHouse, RabbitMQ, Sentry, BullMQ, Sharp, MinIO

Highlights:
• Implemented backend features for advertising management platform, including RBAC-related functionality, REST API endpoints, and multilingual (i18n) support
• Integrated third-party advertising and analytics platforms (social media and ad network APIs) for conversion tracking and campaign analytics
• Configured Sentry-based error tracking and performance monitoring across microservices
• Participated in migration of statistical data from MariaDB to MongoDB and developed synchronization flows with a ClickHouse-based analytics microservice
• Implemented unit, integration, and E2E test suites using Jest

Backend developer

from 03.2024 to 08.2024 (6 months)
DiA, Дистанційно (IT)

Stack: Node.js, Express.js, MongoDB, Redis, Socket.IO, WebSocket, FFmpeg, Sharp, React.js

Highlights:
• Implemented backend features for an e-commerce marketplace platform, including product management, user interactions, and marketplace workflows.
• Optimized MongoDB queries using aggregations, indexing strategies, and data structure improvements, reducing database load and response times.
• Implemented Socket.IO-based voice calling functionality in a clustered Node.js environment.
• Analyzed and resolved backend performance bottlenecks, eliminating excessive database operations and improving overall system responsiveness.
• Fixed caching-related issues and improved cache consistency across application services.
• Diagnosed and resolved issues across third-party integrations and media-processing services, including FFmpeg, Google Translate, and Sharp.
• Implemented custom SEO optimization architecture within the React.js application, bridging backend data fetching and frontend rendering to improve search engine indexing.

Education

Secondary

Knowledge and skills

• Express.js
• NestJS
• React
• JavaScript
• TypeScript
• Node.js
• GitHub
• Git
• PostgreSQL
• MongoDB
• Docker
• REST API
• ELK
• Grafana
• RabbitMQ
• BullMQ
• Jest
• Prometheus

Language proficiencies

• English — average
• Ukrainian — fluent

Additional information

Backend Developer focused on Node.js and TypeScript. Experienced in building REST APIs, backend features, third-party integrations, asynchronous processing, and real-time functionality.
Worked with NestJS and Express.js, PostgreSQL, MongoDB, Redis, ClickHouse, RabbitMQ, and BullMQ. Have experience working with distributed backend components and data-intensive functionality, as well as optimizing database queries and investigating performance issues.
Comfortable with unit, integration, and E2E testing using Jest, Docker-based development, logging and monitoring, and integrating external services and APIs.