Work experience.
Senior frontend engineer and technical lead in Berlin. 10+ years of React, TypeScript, and Next.js across pharma, legal, fintech, IoT, and SaaS.
Binary Code Barn
Founder & Full Stack Developer
Founder of a Berlin-based web agency delivering React, TypeScript, and Next.js applications, frontend architecture, and design systems for enterprise clients and its own SaaS products.
Client engagements
Baker McKenzie
Senior React Frontend Engineer (Contract)
Build enterprise React and TypeScript applications for an international law firm, integrating REST APIs and Azure identity management into secure business workflows.
More details & technologies
Deliver enterprise React and TypeScript applications within Baker McKenzie's engineering organization in Chicago, USA, as a client project through Binary Code Barn.
Integrate REST APIs with TanStack Query (React Query) for data fetching, caching, and server-state management, with Zod for client-side validation.
Implement Microsoft Azure authentication and authorization to bring enterprise identity management into frontend applications.
Collaborate with frontend and backend engineers through code reviews, sprint planning, and Git-based workflows to deliver scalable, reusable frontend architecture.
Technologies
Also used: Storybook · TanStack Table · Zustand · Design System · Vite · Webpack · Jest · React Testing Library · ESLint · Prettier · SCSS · CSS · Cube.js
Top 5 Multinational Pharmaceutical Company (NDA)
Senior React Frontend Engineer / Technical Lead (Contract)
Led 5–10 engineers delivering data-intensive React and TypeScript analytics applications and a shared design system, and reduced ESLint errors from roughly 7,000 to under 100.
More details & technologies
Delivered a client project through Binary Code Barn for a top 5 multinational pharmaceutical company in Basel, Switzerland, under NDA.
Led and mentored 5–10 engineers as technical lead, architecting scalable frontend systems and setting direction for design patterns, testing strategy, CI/CD workflows, and delivery practices.
Built data-intensive React applications for large enterprise analytics datasets using Cube.js, TanStack Table virtualization, and lazy loading.
Developed interactive dashboards with Highcharts and Recharts, using TanStack Query (React Query) for API caching and Zustand for complex filtering and state management.
Built and integrated a shared design system with Storybook, improving code reuse and accelerating delivery across engineering teams.
Established ESLint standards and guidelines for AI-assisted development with Claude and GitHub Copilot, improving architectural consistency, operational efficiency, and development speed.
Reduced the ESLint error count from roughly 7,000 to under 100, then delegated the remaining fixes to the team.
Technologies
Also used: TanStack Query · Zustand · Storybook · Design System · CI/CD · React i18next · Vite · Webpack · Jest · React Testing Library · ESLint · Prettier · SCSS · CSS
Products
All projectsUbiqlu
Social publishing platform to compose, schedule, and track posts across LinkedIn, Instagram, and Facebook (beta). Built with Next.js, Clerk, PostgreSQL, Tailwind CSS, Next.js Workflows, Upstash Redis, and Stripe.
Fitcomrade
SaaS product that helps fitness coaches manage unlimited clients and reusable workout plans. A React and TypeScript application with complex UI interactions, built with TanStack Query, TanStack Table, Zustand, and Polar payments.
More details & technologies
Operate a solo web agency in Berlin, Germany, delivering B2B contracts, custom SaaS platforms, and advanced frontend architectures from concept to launch.
Technologies
Also used: SCSS · CSS · ESLint · Prettier · Jest · React Testing Library · TanStack Query · TanStack Table · Zustand · Redis · Stripe · Polar
Glassnode
Senior Full Stack Developer
Built a cryptocurrency portfolio tracker and data-intensive financial interfaces with React, TypeScript, and Next.js, and increased test coverage by 80%.
More details & technologies
Built a high-performance crypto and NFT transactions table that lets users sort, organize, and categorize transactions for tax records, with a focus on performance, usability, and thorough testing.
Implemented a testing strategy with Jest, React Testing Library, and Cypress for unit and end-to-end testing, increasing overall test coverage by 80%.
Improved the team's transition to trunk-based development through a focus on testing and code quality, supporting frequent releases.
Standardized theme styling and design system tokens (typography, spacing, and palettes) and established an internal developer style guide.
Integrated external platforms into the application, including WalletConnect.
Introduced ESLint and Prettier to enforce consistent code quality.
Technologies
Also used: Material UI · React Testing Library · Mock Service Worker · Cypress · Ethers.js · Web3.js · PostgreSQL · Prisma · Vercel
Relayr
Senior Frontend Developer
Introduced a shared design system and component library with Material UI and Storybook, and standardized tooling and CI/CD across multiple frontend projects.
More details & technologies
Collaborated with the design team to introduce a design system with Material UI and Storybook, giving every product a consistent UI/UX.
Standardized and automated the development environment across multiple projects with a custom Create React App boilerplate that bootstrapped new applications with prebuilt testing, Prettier, ESLint, and Jenkins configuration.
Automated releases and changelogs with semantic-release and conventional commits (semantic versioning).
Configured Webpack and Rollup for libraries and UI applications, replacing legacy Gulp and Grunt setups to improve maintainability.
Wrote unit tests with React Testing Library (replacing Enzyme) and advocated for Cypress for visual testing to bridge the gap between frontend and QA engineers.
Improved the testing developer experience by introducing Mock Service Worker (MSW) for API mocking.
Technologies
Also used: Cypress · React Testing Library · Mock Service Worker · Node.js · Express · Semantic UI · ESLint · Prettier · Jenkins · CI/CD · Airbnb Style Guide · Semantic Versioning
VentureDive
Full Stack Software Engineer
Built React interfaces for healthcare and mobility web applications while mentoring junior developers.
More details & technologies
Mentored junior developers, streamlined team processes, and defined application structure.
Configured, managed, and deployed servers on cloud services such as AWS, using tools like PM2.
Technologies
Also used: Enzyme · Ant Design · Bootstrap · Material UI · CSS-in-JS · HTML5 · CSS3 · SCSS · Flex Layouts · Webpack · AWS · PM2 · Git
Servup
Full Stack Software Engineer
Led a team building a B2B chat funnel with Node.js and WebSockets, mentoring five engineers on frontend development and project delivery.
More details & technologies
Developed user-facing features in React and React Native.
Built server-side logic, including REST and WebSocket APIs, with Node.js, Express, and MongoDB.
Integrated Stripe, 2Checkout, and JazzCash payments on the client side.
Trained and mentored interns and junior developers in JavaScript, responsive web design (Bootstrap, jQuery, and React), Node.js, Sequelize and Mongoose ORMs, and data flows.
Ran scrum cycles, tracked timelines, and optimized team resource utilization.
Contributed to project scope and architecture decisions.
Technologies
Also used: JavaScript · ES6+ · Redux · Mongoose · REST · WebSockets · Scrum · Stripe · 2Checkout · JazzCash · Styled Components · Bootstrap · Material UI · Ant Design · HTML5 · CSS3 · SCSS · Flex Layouts · Storybook · Webpack · Git · AWS · Cloudinary · SSL/HTTPS · PM2 · Linux
OneByte LLC
Full Stack Software Engineer
Turned designs into pixel-perfect, responsive interfaces and built supporting REST APIs with Node.js and MySQL.
More details & technologies
Developed and maintained dynamic web applications with JavaScript, Node.js, and React Native.
Collaborated with cross-functional teams to implement REST APIs.
Converted PSD designs into pixel-perfect, responsive HTML templates.
Managed databases with MySQL and Sequelize, ensuring data integrity and optimized performance.
Technologies
Also used: REST · Angular · jQuery · Lodash · ES6 · JWT · Bootstrap · HTML5 · CSS3 · SCSS · Git · Linux · Ubuntu
“Working with Adeel at Glassnode was a testament to what a Senior Frontend Engineer should be.”
Ondrej Barta