Freelancer profile translated to English.
Back to original languageAbout Jens
🚀 Fullstack Developer (8+ years of experience) | Robust Go Backends & Modern React/Next.js Frontends
Are you looking for a Fullstack Developer who not only writes clean APIs but also masters frontend performance, sets your product apart from the competition, and delights your users?
As a freelance software developer, I combine the best of both worlds: performant, highly scalable backends with Go (Golang) and interactive, user-friendly frontends with React and Next.js. With over 8 years of professional experience, I help startups, agencies, and companies build future-oriented web applications from scratch or scale existing systems.
Beyond classic fullstack development, I bring an eye for creative frontend and UI/UX – with interactive 3D elements (Three.js/WebGL) if needed, to give your application that certain something extra. My goal: products that shine technically and make users HAPPY.
🛠 MY FOCUS & TECH STACK
• Backend & APIs: Go (Golang), REST APIs, gRPC, Node.js, PostgreSQL / MongoDB
• Modern Frontend: React, Next.js, TypeScript, TailwindCSS, State Management (Zustand, Redux)
• Creative Frontend: Three.js, WebGL (for interactive 3D features)
• DevOps & Tooling: Docker, Git, CI/CD, Cloud Hosting (AWS, GCP, Vercel)
💡 WHAT YOU CAN EXPECT FROM COLLABORATING WITH ME:
1. End-to-End Development: From database architecture and API design in Go to pixel-perfect React frontend.
2. Performance & SEO: Blazing-fast loading times through Server-Side Rendering (SSR) with Next.js and optimized Go services.
3. Product Differentiation: Creative input and technical expertise to make your web app stand out from the crowd.
4. Transparent Communication: Agile working, direct communication, and absolute reliability.
💬 Let's discuss your project!
Simply send me a message for a no-obligation introductory meeting. I look forward to realizing your project together!
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Tempest GmbHSenior Frontend DeveloperSOFTWARE PUBLISHINGJanuary 2023 - June 2023 (5 months)Berlin, GermanyWorked on the core frontend of a privacy-focused search engine, focusing on user experience, performance, and modern web standards.Key Achievements:• Engineered frontend features for the private search application with a strong emphasis on page speed, Core Web Vitals, and SEO.• Integrated interactive map components and localized search results to improve geographical user intent.• Structured type-safe and modular application layers using TypeScript.• Built and maintained comprehensive automated End-to-End (E2E) testing flows with Cypress.
- Seitenbau GmbHSenior Frontend DeveloperPUBLIC SECTORFebruary 2021 - December 2022 (1 year and 10 months)Konstanz, GermanyLed the frontend migration of large-scale public administration portals to highly accessible, modern React architectures.Key Achievements:• Migrated a legacy Java Liferay portal system to a modern React & TypeScript SPA communicating with REST APIs (service-bw.de & amt24.sachsen.de).• Developed and organized a shared component library with Storybook to ensure layout consistency across portals.• Implemented robust testing strategies using Jest (Unit) and Cypress (E2E) to secure stability for public services.• Ensured strict compliance with high web accessibility guidelines (a11y / BITV 2.0).
- MOIA GmbHFull Stack Engineer Autonomous ServicesAUTOMOBILEApril 2019 - October 2019 (7 months)Berlin, GermanyDeveloped web services and frontend logic for an autonomous mobility fleet management system and experimental passenger interfaces.Key Achievements:• Enhanced a complex Fleet Management System by introducing wizard-like UI flows to construct sophisticated data chains.• Designed and established a full release cycle pipeline strategy for autonomous service components.• Coordinated UI/UX concepts in close collaboration with the VW Future Lab to prototype a passenger application using Unity.
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Education
- Specialist Application Development 2.1IHK Karlsruhe2014- Third level support for Finance Operation - Introduce AOP in the Billing Development to use a control system from Java - Create a presentation about the Project Management Process in the Business System Department - Update the UX Guide Line for Server Development, Attending conferences to exchange knowledge - Final Project in Server Development: Developing a Control Panel for 1and1 Server Monitoring Customers as Java Portlet
Certifications
- MySQL 5.6 DeveloperBBS Montabaur2013