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

Higlights:
• Architected and deployed a decentralized escrow system on the TON blockchain using the Factory-Child smart contract pattern to automate secure, monthly rental payments and security deposit holdings
• Implemented complex smart contract logic handling USDT Jettons, payload validation, dynamic state tracking, automated fund forwarding, and a multi-party dispute resolution mechanism
• Implemented unit and integration tests for core smart contract logic, focusing on payment flows, validation rules, and state consistency
• Integrated KYC/AML verification via SumSub, including access token generation and webhook handling for user verification status synchronization
• Integrated MinIO (S3 storage) for secure image upload and management for property listings
• Integrated geolocation and address lookup functionality using OpenStreetMap services
• Implemented structured application logging using Pino to improve debugging and centralized log collection workflows
• Implemented automated document generation workflows, populating contract templates with verified user data and converting generated DOCX documents to PDF format

Node.js 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

Node.js developer

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

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

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

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

Hard skills:

Languages: JavaScript/TypeScript
Backend: Node.js, Express.js, NestJS
Databases: PostgreSQL, MongoDB, Redis, ClickHouse
Messaging: RabbitMQ, Redis Pub/Sub
DevOps: Docker, Jenkins
Monitoring: ELK, PLG, Sentry
Testing: Jest (Unit, Integration, E2E)
Cloud & Storage: S3, Google Cloud
Frontend: React JS (Redux, Tailwind, TanStack Query)