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Опыт работы

Backend / WEB3 engeneer

с 01.2026 по 03.2026 (3 месяца)
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

с 06.2025 по 01.2026 (8 месяцев)
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

с 11.2024 по 06.2025 (8 месяцев)
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

с 03.2024 по 08.2024 (6 месяцев)
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

Образование

Среднее

Знания и навыки

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

Знание языков

• Английский — средний
• Украинский — свободно

Дополнительная информация

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)