Open to opportunities

Andrii Kaplan

@andriikaplan

Message

I build scalable full-stack applications and AI-powered document-processing workflows.

Poland

Message

What I'm looking for

I'm looking to build reliable, scalable AI-driven products, especially involving RAG, semantic search, asynchronous processing, and production-grade backend systems.

I've built production applications at Zenbit Tech and Sysmo.PL using TypeScript, Node.js, NestJS, React, PostgreSQL, and MongoDB. At Zenbit Tech, I reduced memory usage by 48%, improved application response time by 45%, and delivered document extraction for scanned inputs using OpenAI GPT and Tesseract.js.

I take backend features from technical design through testing, deployment, monitoring, and production support. I'm particularly interested in RAG, semantic search, asynchronous processing, and scalable AI-driven products.

Experience

Work history, roles, and key accomplishments

Software Engineer

Zenbit Tech

Dec 2024 - May 2026 (1 year 5 months)

Reduced production memory usage by 48% and improved application response time by 45%. Integrated OpenAI GPT with Tesseract.js for document extraction and achieved 80% unit test coverage.

NestJS React TypeScript PostgreSQL MongoDB OpenAI API Tesseract JWT Jest Heroku

Full-Stack Engineer

Sysmo.PL

Jan 2024 - Nov 2024 (10 months)

Built an e-commerce marketplace platform with RESTful API, product management, and seller portal. Implemented multi-field search, filtering, sorting, and delivery modules with distance calculation and shipping cost estimation.

TypeScript NestJS TypeORM PostgreSQL React REST APIs