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Aliaksandr Prytychanka

@aliaksandrprytychank

Message

I build secure Node.js backends for FinTech, crypto, iGaming, and operational workflow products.

Poland

Message

I've built Node.js backends for Gamixter's B2B iGaming platform and WISY LTD's crypto investment product, supporting real-time features, analytics, and transaction-safe workflows for roughly 1,000 daily active users.

At WISY, I added API rate limiting, designed a multi-level referral system, and improved complex data operations through Redis caching, PostgreSQL indexes, and query rewrites. At Gamixter, I adapted domain models to changing client requirements, worked with event-driven messaging and Centrifugo WebSocket subscriptions, and maintained BigQuery data-processing tasks.

Earlier, I digitized airport ground-staff workflows at AERODROM TECH, including PostGIS geospatial search and DigitalOcean CI/CD, and built an admin dashboard during my Itransition internship. AI tools including GitHub Copilot, ChatGPT, and Claude are part of my daily workflow for refactoring, test generation, and code review.

Experience

Work history, roles, and key accomplishments

Node.js Backend Developer

Gamixter

Feb 2025 - Apr 2026 (1 year 2 months)

Adapted the domain model to frequently changing client requirements without breaking live functionality. Worked within an event-driven system using message queues and real-time WebSocket subscriptions over Centrifugo.

NestJS PostgreSQL TypeScript Centrifugo WebSockets Message Queues Event Driven Architecture ChatGpt Claude

Node.js Backend Developer

WISY LTD

Nov 2023 - Feb 2025 (1 year 3 months)

Added API rate limiting to shrink the attack surface for spam and abuse on top of transaction-safe processing. Designed and built a multi-level referral system where inviters earn commission on invitee purchases.

Fastify PostgreSQL Redis Prisma AWS Docker Rate Limits Caching Query Optimization

Node.js Backend Developer

AERODROM TECH

May 2023 - Nov 2023 (6 months)

Built the backend of an internal application that replaced paper-based record keeping for airport staff. Developed a geospatial search feature using PostGIS and automated CI/CD processes on DigitalOcean.

NestJS PostgreSQL PostGIS TypeORM DigitalOcean CI CD Geospatial

Software Developer Internship

Itransition Group

Nov 2022 - Apr 2023 (5 months)

Designed and built an admin dashboard for reviewing and managing user-generated content. Implemented the review creation flow with supporting features.

React Express PostgreSQL Sequelize