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Senior Front-End Developer with 6+ years of experience building, maintaining, and improving production web applications using React, Next.js, TypeScript, and JavaScript. Strong in front-end architecture, complex UI development, API integration, performance optimization, testing, CI/CD, code quality, and long-term maintainability. Experienced with GraphQL and REST/OpenAPI, Node.js, Docker, GitHub Actions, Jest, React Testing Library, and monorepo-based codebases. Works across complex product areas such as session management, structured and table views, search/state handling, and scientific data visualization.…Senior Front-End Developer with 6+ years of experience building, maintaining, and improving production web applications using React, Next.js, TypeScript, and JavaScript. Strong in front-end architecture, complex UI development, API integration, performance optimization, testing, CI/CD, code quality, and long-term maintainability. Experienced with GraphQL and REST/OpenAPI, Node.js, Docker, GitHub Actions, Jest, React Testing Library, and monorepo-based codebases. Works across complex product areas such as session management, structured and table views, search/state handling, and scientific data visualization.

Przemysław Jóźwiak

Front-End Developer, Web Developer, Software Engineer, +2

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Senior Front-End Developer with 6+ years of experience building, maintaining, and improving production web applications using React, Next.js, TypeScript, and JavaScript. Strong in front-end architecture, complex UI development, API integration, performance optimization, testing, CI/CD, code quality, and long-term maintainability. Experienced with GraphQL and REST/OpenAPI, Node.js, Docker, GitHub Actions, Jest, React Testing Library, and monorepo-based codebases. Works across complex product areas such as session management, structured and table views, search/state handling, and scientific data visualization.…Senior Front-End Developer with 6+ years of experience building, maintaining, and improving production web applications using React, Next.js, TypeScript, and JavaScript. Strong in front-end architecture, complex UI development, API integration, performance optimization, testing, CI/CD, code quality, and long-term maintainability. Experienced with GraphQL and REST/OpenAPI, Node.js, Docker, GitHub Actions, Jest, React Testing Library, and monorepo-based codebases. Works across complex product areas such as session management, structured and table views, search/state handling, and scientific data visualization.

Available to hire

Senior Front-End Developer with 6+ years of experience building, maintaining, and improving production web applications using React, Next.js, TypeScript, and JavaScript. Strong in front-end architecture, complex UI development, API integration, performance optimization, testing, CI/CD, code quality, and long-term maintainability.

Experienced with GraphQL and REST/OpenAPI, Node.js, Docker, GitHub Actions, Jest, React Testing Library, and monorepo-based codebases. Works across complex product areas such as session management, structured and table views, search/state handling, and scientific data visualization.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Advanced

Work Experience

Senior Frontend Developer at NatuealAntibody SA

February 1, 2022 - Present

Owned front-end development and long-term maintenance of a Lerna-based monorepo with five production applications supporting a bioinformatics data visualization platform. Led development of complex product areas including session management, structure views, table views, search and state handling, and scientific data visualization features. Improved front-end architecture, performance, reliability, dependency health, and code quality across React, Next.js, TypeScript, GraphQL, and OpenAPI-based applications. Handled engineering infrastructure tasks such as Dockerfiles, GitHub Actions workflows, security vulnerability remediation, testing, and production build stability. Maintained and extended a Node.js GraphQL API gateway orchestrating access to internal microservices and supporting frontend data needs. Contributed to an AI agent project built with Python and Chainlit, gaining practical Python exposure through agent workflows and application integration.

Mid-level Frontend Developer at SB Betting Software Sp. z o.o.

May 1, 2021 - January 31, 2022

Built and maintained frontend features for production betting platforms delivered to multiple clients. Contributed to React, Next.js, TypeScript, and JavaScript web applications with a focus on scalable UI, performance, and maintainability. Helped build the forBet client frontend from scratch as part of a small delivery team, delivering UI improvements in a fast-moving commercial environment while balancing product requirements, reliability, and user experience.

Junior Frontend Developer at AI AI Sp. z o.o.

March 1, 2020 - April 30, 2021

Developed and customized e-commerce storefront layouts for client projects. Built and adjusted base templates using JavaScript, CSS, and LESS. Improved template performance and supported client-facing changes for commercial online stores.