Martin M.
Frontend Developer
Experience
Frontend Developer
Florio C3G
Developed a health record app that helps patients schedule medication, track symptoms, and monitor biomarkers.
Worked with React Native, Expo, and Redux Toolkit.
App will be certified as a medical device.
Frontend Developer
Boehringer Ingelheim
Built SuperPetApp, a health record app for pet owners to manage their pets’ health.
Technologies: React Native, Expo, NativeWind, SQLite, TanStack Query.
Owner & Lead Developer
Elektrofreund
Designed and coded a personal app teaching basics about electric vehicles for iOS and Android.
Implemented over 50 articles, a charging map, quizzes, and a logbook.
Technologies: React Native, event sourcing, TanStack Query.
Published on web, iOS, and Android.
Frontend Developer
Netze BW
Enhanced and maintained a customer portal for electricity topics.
Wrote new features, released and upgraded multi-tenant apps, and migrated to a new tech stack, achieving cost savings.
Technologies: React, TypeScript, Vanilla Extract, SCSS, SWR, Redux, Playwright.
Frontend Developer
SAP
Developed a content discovery tool for SAP employees to find product documentation.
Technologies: React, TypeScript, React Query.
Frontend Developer
Deutsche Bank (Breaking Wave)
Built a digital captive tool for merchants to view transactions, statistics, and execute transactions.
Technologies: React, TypeScript, React Query.
Frontend Developer
About You
Worked on the product page of the relaunched About You shop.
Technologies: React, TypeScript, gRPC.
Frontend Developer
HERE Technologies
Contributed to the Navigation on Demand platform.
Connected gRPC services in TypeScript with Kotlin and C++ components.
Integration Engineer
Ada Health
Provided client integration support for the chatbot system SDK.
Technologies: TypeScript, Node.js, JavaScript.
Owner & Full Stack Developer
Stromi
Created an EV charge price calculator and charge planner mobile and backend system.
Designed a charge simulator and price calculator library; backend provides station and tariff data.
Technologies: React Native, TypeScript, Styled Components, PostgreSQL (TypeORM & Prisma), PostGIS, Node.js, Heroku.
Frontend Developer
Veta Health
Took over an MVP, fixed architectural mistakes, and modularized state machine components.
Technologies: TypeScript, Webpack, Jest, React, XState, PouchDB, Vercel, Dato CMS, GraphQL.
Full Stack Engineer
Ada Health
Designed and developed an SDK to create, replay, and compose dialogs for Ada’s cross-platform chatbot system, interconnecting local and remote chat flows.
Architected a software solution enabling custom diagnostic chats for large US-based health insurers.
Technologies: React Native, Node.js, TypeScript, Lerna, Webpack, Jest, XState, Redis.
Frontend Developer
eBay / move
Built the first version of a car dealer tool and onboarded new colleagues.
Developed a user flow control mechanism similar to a state machine.
Technologies: ES6, Redux, Redux Saga, TestCafe, Jest, GitHub, Styled Components.
React Native Developer
Ada Health
Fixed native platform issues to achieve feature parity on iOS and Android.
Replaced unmaintained libraries, reverse engineered and documented app features, and onboarded junior developers.
Technologies: ES6, React Native, Redux, Redux Saga, Atomic Design, Jest, Generators, GitHub, Styled Components.
Owner & Developer
Kazuo
Developed a translation app for learning and translating large numbers with different digit grouping.
Released before Google Translate supported numeric translation correctly.
Technologies: React Native, Styled Components.
Frontend Developer
SolarisBank
Set up an in-house tool for bank account access.
Technologies: TypeScript, ES6, React, Redux, Redux Saga, Atomic Design, Jest, Enzyme, Ramda, Redux Forms, Generators, GitHub, PostCSS, Scrum.
Frontend Developer
Volkswagen
Contributed to the relaunch of the Volkswagen website.
Technologies: TypeScript, ES6, React, Redux, Atomic Design, Async, Gerrit, Less, Scrum.
Frontend Developer
Quazer
Implemented an asset management tool for a streaming platform.
Technologies: React, Redux, Foundation, Swagger Tools, Node.js, GitLab, Sass, Scrum.
Frontend Developer
Zalon by Zalando
Developed an in-house stylist tool for curated fashion shopping used by hundreds of stylists.
Technologies: React, Redux, AltJS, GitHub, ES6, Sass, Scrum, Kanban.
Frontend Developer
Edenspiekermann
Built a streaming website with a custom player for the Lollapalooza festival.
Technologies: AngularJS 1, JavaScript, CSS.
Web Developer
Freelance
Launched over 90 WordPress-based websites with custom PHP, jQuery, and CSS templates.
Notable projects: Mercedes-Benz blog, Nokia Windows Phones launch blog.
Summary
Experienced Senior Frontend Developer with over 14 years of expertise in building and maintaining scalable web and mobile applications. Proficient in technologies such as React, React Native, Node.js, and TypeScript, with an understanding of BFF systems, as well as PostgreSQL and various ORMs.
Demonstrated success in taking over a React Native app with a user base over a million people, reverse engineering its underlying chatbot and developing an SDK for composing dialogs, that enhanced operational efficiency for an innovative health diagnosis platform.
Passionate about writing own apps for the app store like Kazuo, Stromi, and Elektro Freund.
Passionate about simplicity in code. Proven track record in mentoring junior developers and onboarding teams onto new domains.
Languages
Education
FU Berlin
Magister · Communication Science · Berlin, Germany
HU Berlin
Magister · Japanologie · Berlin, Germany
TU Berlin
Technical Computer Science · Berlin, Germany
Similar Freelancers
Discover other experts with similar qualifications and experience
- English
- Deutsch
2025 © FRATCH.IO GmbH. All rights reserved.