Open to opportunities

Daniel Kowalski

@danielkowalski

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Full-Stack Developer with extensive experience in web, mobile, blockchain and AI technologies

Poland

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What I'm looking for

I am looking for a role that fosters innovation, encourages continuous learning, and offers opportunities to work on cutting-edge technologies.

I am a Senior Full-Stack Developer with over a decade of experience in designing and delivering robust web and mobile platforms. My expertise spans modern JavaScript frameworks, scalable backend APIs, and DevOps practices, with a strong focus on performance optimization and user-centric design. I am passionate about continuous learning and the rapid adoption of emerging technologies, including blockchain and artificial intelligence.

Throughout my career, I have successfully led the development of various NFT marketplaces, integrating advanced features such as AI-powered search and real-time analytics. My role as a mentor has allowed me to foster a collaborative team culture, guiding junior developers through code reviews and Agile practices. I thrive in environments that challenge my skills and encourage innovation, and I am dedicated to delivering high-quality solutions that meet user needs.

Experience

Work history, roles, and key accomplishments

Lead Full-Stack Developer

NftHive

May 2022 - Dec 2024 (2 years 7 months)

- Led the full-stack development of a WAX blockchain-based NFT marketplace, utilizing Next.js, React, Tailwind CSS, and MUI on the frontend, and Node.js with custom APIs and smart contract integrations on the backend.
- Engineered and optimized performance-heavy features such as real-time NFT floor pricing, inventory
synchronization, and bulk listing tools.

Next.js React Node Smart Contracts Pinecone Cloudflare Agile Wax Blockchain

Senior Full-Stack Developer

MAD

Jan 2020 - May 2022 (2 years 4 months)

- Led the development of an exclusive NFT marketplace on the Harmony blockchain, overseeing end-to-end architecture, frontend integration, and deployment using Next.js, Tailwind CSS, and AWS.
- Integrated smart contract functionality into the web platform using Ethers.js and Web3, enabling seamless user interactions such as minting, listing, and trading NFTs through a responsive UI.

Next.js AWS Harmony Blockchain Smart Contracts Web3 Docker Automated Testing Agile

Full-Stack Developer

U2iSub

Mar 2016 - Feb 2020 (3 years 11 months)

- Maintained and extended a React Native mobile application for a healthcare institution, implementing new features, fixing performance bottlenecks, and integrating with cloud-based services during the migration from on-premise infrastructure to AWS.
- Developed a scalable ETL pipeline using Python and Apache Airflow to process large volumes of structured and unstructured healthcare data.

React Native AWS Python Apache Airflow Node PostgreSQL React MongoDB ETL Agile

Junior Full-Stack Developer

U2iSub

Aug 2014 - Apr 2016 (1 year 8 months)

- Built web applications using PHP/Laravel and Bootstrap for clients, creating reusable UI components to accelerate future development.
- Developed mobile APIs with Node.js and MongoDB, improving app load times by 50%, and created hybrid mobile apps using Ionic with REST API integration.
- Improved security by adding JWT and OAuth login, and collaborated in Agile teams for weekly updates.