Available to hire
With over 9 years of professional experience, including more than 8.5 years specializing in React, TypeScript, and distributed systems, I have delivered enterprise-scale solutions for major organizations including UBS, E.ON, B/S/H, Conrad.de, and PwC. My expertise spans building high-performance platforms, implementing CI/CD pipelines, and architecting microservices that serve millions of users globally.
Recently, I’ve been deeply focused on AI-driven development workflows and have hands-on experience integrating OpenAI APIs with Langfuse for prompt optimization in production applications. I’m particularly interested in AI-assisted coding optimization techniques that enhance developer productivity—from automated code refactoring and test generation. I am actively exploring how AI can transform the developer experience through automated DevOps workflows and I’m building my own local ecosystem to prompt and code better.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Language
English
Advanced
German
Intermediate
Polish
Fluent
Work Experience
AI-Driven Shopping Assistant Platform (Side Project)
June 1, 2025 - PresentDesigned and built a web-based tool to assist users in selecting home appliances and electronics based on personalized needs. Developed intuitive interfaces and recommendation features using React, ensuring a user-friendly experience. Integrated APIs and product databases to provide real-time comparisons and insights. Focused on performance, accessibility, and responsive design to cater to a broad audience. Used OpenAI API and Langfuse for prompt management and optimization. Technologies included React, TypeScript, Tailwind, Bun, PostgreSQL backend, GitHub Actions CI/CD pipeline with automated deployment workflows, Algolia integration, and BrowserUse for data automation.
Fullstack Developer – Contractor at Fortum
January 1, 2024 - PresentDeveloped a comprehensive distributed B2B platform for managing electric vehicle fleets, charging sessions, and payment processing. Led architecture decisions for a multi-tenant system serving enterprise clients across Europe. Utilized Next.js, TypeScript, GraphQL, Node.js with Express, and PostgreSQL. Implemented unit tests with React Testing Library and E2E testing using Playwright. Integrated Azure, containerized deployments, CI/CD pipelines, a shared components library, and design system implementation.
Frontend Developer – Contractor at B/S/H
June 30, 2023 - September 3, 2025Developed and maintained a cutting-edge design system to streamline UI/UX consistency across multiple web applications. Collaborated with cross-functional teams to implement reusable React components ensuring scalability and adherence to modern design standards. Optimized performance and accessibility resulting in a seamless user experience. Played a key role in integrating new design tools and workflows for improved efficiency. Employed React, TypeScript, Figma integration, design/composition tokens, monorepo management, automated package release processes, automated regression testing, CI/CD pipeline optimization, and cross-functional team leadership establishing reusable component standards.
Frontend Developer – Contractor at Valtech / Cartier
August 31, 2022 - September 3, 2025Delivered a special event and product page for jewellery manufacturer Cartier. Worked closely with UX/UI teams and business managers to meet tight deadlines and ensure pixel-perfect design. Technologies used were Next.js, TypeScript, Tailwind, Storyblok headless CMS integration, component library, and multi-language support under Agile/Scrum methodology.
Frontend Developer – Contractor at Nexum / Manor.ch
March 31, 2022 - September 3, 2025Developed a new e-commerce platform for one of the largest online shops in Switzerland, focusing on frontend SEO and application performance. Technology stack included Next.js, TypeScript, Apollo GraphQL, React-query, Amplience headless CMS, custom Lit components with Svelte plugins, Algolia search engine integration, automated testing, deployment pipeline optimization, i18n multilanguage support, and Git flow with Scrum. Also maintained Storybook for UI components.
Frontend Developer – Contractor at Fides Treasury / Credit Suisse
December 31, 2022 - September 3, 2025Worked on fintech applications dedicated to the banking industry. Designed and organized a shared components library, established contribution and maintenance rules. Utilized React with TypeScript, Context API, React-hooks-forms with Zod, AG-Grid with multiple use cases, custom configuration, unit testing with React Testing Library, HTML + CSS-in-JS styled components, multilanguage support, Git flow, Scrum (SAFe), and design system with shared components and Storybook.
Frontend Developer – Contractor at UBS
May 31, 2021 - September 3, 2025Worked on E-banking client applications used by private clients worldwide. Developed micro-frontend architecture supported by SPA applications and multi-level component concepts. Used React, TypeScript, Redux with migration to Context API, AG Grid, unit tests with React Testing Library, HTML with CSS-in-JS, CSS Modules, multilanguage support, Git flow, Scrum (SAFe), shared components, and Storybook.
Frontend Developer – Contractor at Hyundai
December 31, 2020 - September 3, 2025Developed a car configuration application for Hyundai car manufacturer with multi-tenant architecture. Used React, TypeScript, Redux with RxJS, GraphQL, HTML with CSS-in-JS, Styled Components, multi-language support, Git flow, Scrum, CI/CD pipeline, Docker, Kubernetes, and Storybook.
Fullstack Developer – Contractor at PwC Switzerland
September 30, 2020 - September 3, 2025Developed a greenfield e-commerce project focused on digital products. Designed multi-tenancy architecture to sell the application on a SaaS model to other PwC territories. Technology stack included Next.js, TypeScript, PHP with Symfony (Spryker E-commerce CRM), HTML + CSS-in-JS, Styled Components, multilanguage support, unit testing with React Testing Library, end-to-end tests with Cypress, Git flow, Scrum, CI/CD pipeline, Docker, and Kubernetes.
Frontend Developer – Contractor at Oqio.de
February 28, 2020 - September 3, 2025Worked on a client-side application for members in the property insurance process. Created Oqio Analytics dashboard from scratch using React, Redux (Saga), Flow, HTML + CSS-in-JS, Styled Components with Ant Design, dynamic forms, data visualization with D3.js, unit tests with Jest and Enzyme, end-to-end tests with Selenium and Nightwatch, Git flow, Scrum, Jenkins, and AWS integration.
Frontend Developer – Contractor at Conrad.de
April 30, 2019 - September 3, 2025Part of the Sales Analytics Tools team on a CRM project for Conrad.de. Built CRM application from scratch in React and Redux with HTML + CSS (CSS Modules) and Semantic UI. Created a library of React components shared between multiple internal teams. Worked on data visualization with integration between D3.js and Tableau with custom extensions. Implemented multilanguage support, unit testing with Jest and Enzyme, end-to-end tests with Chrome Headless and Puppeteer, Git flow, Scrum, frontend and backend microservices, Kubernetes environment.
Frontend Developer at daftcode.com
May 31, 2018 - September 3, 2025Worked on a kanban-like task management application with data visualization tools. Built application using Vue.js and Vuex, HTML + CSS (SCSS), notifications based on web sockets communication, Node.js with Express backend, data visualization with Chart.js, multilanguage support, unit tests with Jest and Enzyme, end-to-end tests with Selenium and Nightwatch, Git flow, Scrum.
Frontend Developer at E.ON
September 30, 2017 - September 3, 2025Website relaunch project in Adobe Experience Manager environment. Implemented various components in pure JavaScript, jQuery, and React for multiple child companies of E.ON. Developed complex React + Redux + Flow components, company identity-based components, unit testing with Jest and Enzyme, end-to-end testing with Selenium and Nightwatch, multilanguage support, Git flow, Scrum.
Frontend Developer at Syncano.com
September 30, 2017 - September 3, 2025Worked on Syncano Dashboard, the biggest open source project based on Material-UI using React and Reflux with HTML + CSS and Material-UI.
Frontend Developer at Redingo
February 29, 2016 - September 3, 2025Worked on a Medical Management System application creating new features in Backbone.js with HTML + LESS.
Civil Engineer
January 1, 2016 - September 3, 2025Worked as a Civil Engineer on construction sites including the Warsaw Underground Line part 2. Managed a team of up to 30 people, controlling quality, quantity, and project schedule.
AI-Driven Shopping Assistant Platform - Side Project
June 1, 2025 - PresentDesigned and built a web-based tool to assist users in selecting home appliances and electronics based on personalized needs. Developed intuitive interfaces and recommendation features using React, ensuring a user-friendly experience. Integrated APIs and product databases to provide real-time comparisons and insights. Focused on performance, accessibility, and responsive design to cater to a broad audience. Employed OpenAI API, Langfuse for prompt management and optimization. Utilized React, TypeScript, Tailwind, Bun, PostgreSQL backend. Implemented GitHub Actions CI/CD pipeline for automated deployment workflows. Algolia integration and BrowserUse for data automation.
Fullstack Developer — Contractor at Fortum
January 1, 2024 - PresentDeveloped a comprehensive distributed B2B platform for managing electric vehicle fleets, charging sessions, and payment processing. Led architecture decisions for a multi-tenant system serving enterprise clients across Europe. Utilized Next.js, TypeScript, GraphQL, Node.js with Express, PostgreSQL. Implemented unit tests with react-testing-library and end-to-end testing with Playwright. Used React Hooks Form with Zod, Azure cloud, containerized deployment, CI/CD integration. Developed shared component library and design system.
Frontend Developer — Contractor at B/S/H
June 30, 2023 - September 3, 2025Developed and maintained a cutting-edge design system to streamline UI/UX consistency across multiple web applications. Collaborated with cross-functional teams to implement reusable React components ensuring scalability and adherence to modern design standards. Optimized performance and accessibility resulting in seamless user experience. Played a key role in integrating new design tools and workflows for improved efficiency. Used React, TypeScript, Figma integration, design/composition tokens, monorepo management, automated package release processes, automated regression testing, and CI/CD pipeline optimization. Led cross-functional team leadership establishing reusable component standards.
Frontend Developer — Contractor at Valtech / Cartier
August 31, 2022 - September 3, 2025Prepared special event and product page for jewellery manufacturer Cartier. Collaborated closely with UX/UI teams and business managers under tight deadlines with pixel-perfect design implementation. Used Next.js, TypeScript, Tailwind CSS, Storyblok headless CMS integration, component library, and multi-language support. Agile/Scrum environment.
Frontend Developer — Contractor at Nexum / Manor.ch
March 31, 2022 - September 3, 2025Worked on new e-commerce platform for one of the biggest online shops in Switzerland. Supported frontend with strong focus on SEO and performance. Used Next.js, TypeScript, Apollo GraphQL, React-query, Amplience headless CMS, custom Lit Components, Svelte plugins, Algolia search engine integration, automated testing, deployment pipeline optimization, and multi-language support. Applied Git flow and Scrum methodologies. Worked with Storybook.
Frontend Developer — Contractor at Fides Treasury / Credit Suisse
December 31, 2022 - September 3, 2025Worked on a set of fintech applications dedicated to the banking industry. Helped design and organize a shared components library and implement contribution and maintenance rules. Used React, TypeScript, Context API, react-hooks-form with Zod, AG-Grid for multiple use cases and custom configuration. Wrote unit tests with react-testing-library, styled components, multi-language support. Git flow and Scrum (SAFe) methodology with design system and Storybook.
Frontend Developer — Contractor at UBS
May 31, 2021 - September 3, 2025Worked on E-banking client application used globally by private clients. Developed micro-frontend architecture supporting SPA applications and multi-level components concept. Used React, TypeScript, Redux migration to Context API, AG Grid. Wrote unit tests with react-testing-library and CSS Modules. Multi-language support and Git flow with Scrum (SAFe). Developed shared components and Storybook.
Frontend Developer — Contractor (Short Time Project) at Hyundai Berlin
December 31, 2020 - September 3, 2025Developed car configuration application for Hyundai car manufacturer with multi-tenant architecture. Used React, TypeScript, Redux with RxJS, GraphQL, styled components, multi-language support, Git flow, Scrum, CI/CD pipeline with Docker and Kubernetes. Storybook used.
Fullstack Developer — Contractor at PwC Switzerland
September 30, 2020 - September 3, 2025Greenfield e-commerce project focused on digital products. Designed multi-tenancy architecture to sell the application to other PwC territories via SaaS. Used Next.js, TypeScript, PHP with Symfony (Spryker E-commerce CRM), styled components, multi-language support, unit testing with react-testing-library, end-to-end testing with Cypress, Git flow, Scrum, CI/CD pipelines, Docker, Kubernetes.
Frontend Developer — Contractor at Oqio.de
February 28, 2020 - September 3, 2025Worked on client-side application for property insurance process members to help reporting damages efficiently and improving claim resolution speed and quality. Created Oqio Analytics dashboard from scratch using React, Redux (Saga), Flow. Used styled components, AntDesign, dynamic forms, data visualization with D3.js, unit tests (Jest + Enzyme), end-to-end tests (Selenium + Nightwatch). Git flow, Scrum with Jenkins and AWS integration.
Frontend Developer — Contractor at Conrad.de
April 30, 2019 - September 3, 2025Part of Sales Analytics Tools team in CRM project. Created CRM application from scratch in React and Redux. Developed shared React component library for multiple internal teams, data visualization, multi-language support. Used D3.js integrated with Tableau, unit tests (Jest + Enzyme), end-to-end tests (Chrome Headless + Puppeteer). Git flow, Scrum, frontend and backend microservices, Kubernetes.
Frontend Developer at daftcode.com
May 31, 2018 - September 3, 2025Developed kanban-like task management application with data visualization tools. Used Vue.js, Vuex, SCSS, web socket notifications, Node.js with Express, Chart.js, multi-language support, unit tests (Jest + Enzyme), end-to-end tests (Selenium + Nightwatch). Git flow, Scrum.
Frontend Developer at E.ON
September 30, 2017 - September 3, 2025Website relaunch project in Adobe Experience Manager environment. Implemented components in vanilla JavaScript, jQuery, and React for multiple E.ON subsidiaries. Developed complex React + Redux + Flow components and company identity-based components. Unit tested and end-to-end tested with Jest, Enzyme, Selenium, Nightwatch. Multi-language support, Git flow, Scrum.
Frontend Developer at Syncano.com
September 30, 2017 - September 3, 2025Worked on Backend as a Service platform focusing on faster backend code leveraging existing backend. Developed Syncano Dashboard using React with Reflux and Material-UI. Used HTML, CSS, Material-UI.
Frontend Developer at Redingo
February 29, 2016 - September 3, 2025Worked on Medical Management System application. Created new features using Backbone.js, HTML, LESS.
Civil Engineer
January 1, 2016 - September 3, 2025Worked as Civil Engineer on a construction site on big infrastructure projects including Warsaw Underground Line - part 2. Managed a team of up to 30 people. Controlled quality, quantity, and project schedule.
Education
Master at Warsaw University of Life Sciences
January 1, 2007 - January 1, 2012Master at Warsaw University of Life Sciences
January 1, 2007 - January 1, 2012Qualifications
Industry Experience
Software & Internet, Financial Services, Energy & Utilities, Retail, Manufacturing, Professional Services, Real Estate & Construction
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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