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marcel borowczak

@marcelborowczak

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Fullstack JavaScript developer based in Poland.

Poland

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What I'm looking for

I'm looking for a remote-first fullstack engineering role where I can contribute to meaningful products, solve technical challenges, and grow alongside a skilled and supportive team.

I'm a fullstack developer with a strong focus on TypeScript, React, and Node.js (NestJS). I specialize in building modern, performant web applications and have led development of AI-powered products — most notably Zozalo, an intelligent travel planner leveraging LLMs like GPT-4. I enjoy solving hard technical problems, building clean APIs, and crafting intuitive user experiences. I’ve also worked on aviation tech platforms, custom booking flows, and real-time systems.

I'm actively looking for remote-first roles where I can build impactful software, collaborate with great people, and continue growing as a developer and system architect.

Experience

Work history, roles, and key accomplishments

Current

Freelance Full-stack Developer

Current

Fiverr

Mar 2022 - Present (3 years 4 months)

Freelance fullstack developer delivering end-to-end web apps for startups and solo founders. Built responsive UIs (React, Next.js, Tailwind, Framer Motion) and secure backends (NestJS, TypeORM, JWT). Integrated Stripe, OpenAI, Clerk, Amadeus. Deployed on Vercel/DigitalOcean. Specialized in AI workflows, MVPs, and full product ownership.

Next.js NestJS TypeORM Stripe Stripe Integration

Current

Co-Founder & Full-stack Developer

Current

Zozalo Technologies

Jul 2024 - Present (1 year)

Co-founder and fullstack engineer at Zozalo. Built and scaled the app using Next.js 15, NestJS, PostgreSQL, and OpenAI. Led AI Trip Planner, Smart Booking, and TripMatch™ development. Integrated Stripe, Clerk, Redis, and Amadeus API. Fine-tuned custom LLM, built full backend infra, and launched growth features like Zozalo Passport and Smart Suggestions.

Next.js NestJS PostgreSQL

Frontend Developer

devGaming

Mar 2022 - Jun 2024 (2 years 3 months)

Frontend developer at Devgaming, building and maintaining React-based applications with a focus on performance and UX. Implemented efficient data fetching and caching using TanStack Query. Collaborated closely with backend team to integrate RESTful APIs and deliver smooth, scalable features for end users.

React Tanstack Query Tailwind