Ingo K.-Frontend & Design System Architect
Check rate
Experience
Co-Founder & Managing Director
Elterngeld Buddy GmbH
- Responsible for the entire software architecture of the parental allowance portal
- iOS and Android app with React Native and Expo, incl. push and OTA updates
- Store releases via App Store Connect and Google Play Console
- TypeScript monorepo for app, website and backend, web with Next.js and Tailwind
- Own promo, voucher and discount engine with contact and segment logic
- Payments via RevenueCat and in-app purchases, authentication with BetterAuth
- REST APIs based on OpenAPI, PostgreSQL with Prisma and Drizzle
- Self-hosting on Hetzner with Docker, Coolify, Terraform and GitHub Actions
- Tests with Vitest, Playwright and visual regression via Chromatic
- Observability via Grafana Cloud and error tracking with Sentry
- Performance marketing via Meta Ads, measured with custom event tracking
- Grew the product to 20,000 app users with a purchase rate of almost 12 %
- Managing Director since 04.2025, responsible for product and technology
Full-Stack Developer
sipgate GmbH
- Full-stack development with React, TypeScript, Java Spring Boot and Node.js
- Maintained and extended the UI library of the pandaUI design system
- Built the foundations with UX/UI design: colour token system and icon set
- Component development in Storybook with visual testing via Chromatic
- Migrated all existing product pages onto the new design system
- Established accessibility as a built-in part of every component
- Advised and trained product teams, public documentation at pandaui.de
- Built a complex phone number management area in the customer product
Software Developer – Applied Technology Research
TIMOCOM GmbH
- Preparation and analysis of TIMOCOM data sets
- Close collaboration with data analysts, processing in Jupyter notebooks
- Turned a search algorithm from data analysis into an MVP product
- Prototypes and an MVP starter with React and Java Spring Boot
Digital Media Manager
TIMOCOM GmbH
- Designed and implemented the website for an internal company project
- Built prototypes and demos for trade fairs and events
- Responsible for the digital presence of the project
Software Developer
ControlExpert GmbH
- Full-stack development on the company's core product with Java Spring Boot
- Implemented new features across frontend and backend
Frontend Developer, previously Apprenticeship in Application Development
TIMOCOM GmbH
- Developed and maintained all of the company's web portals within the web team
- Built a design system based on Bootstrap, Grunt and Gulp
- Multilingual portals for use across Europe
- Integration and maintenance of the CMS behind the company website
- Optimised page load times and technical SEO
- Build and deploy automation, at the time via Jenkins
- Unified recurring interface building blocks across portals
- Hired as a permanent Frontend Developer after the apprenticeship
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Transportation, Telecommunication, and Government and Administration.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Marketing, and Research and Development.
Summary
Full-stack developer with eleven years of experience, focused on frontend architecture, design systems and React Native. At sipgate I built the foundations of the public design system pandaUI, colour token system, icon set and accessibility, and migrated all existing product pages onto it. As co-founder of Elterngeld Buddy GmbH I am responsible for the architecture, app and operation of a portal with 20,000 users, from store delivery to self-hosted infrastructure. I work remotely and take on engagements of 20 to 30 hours per week.
Skills
- Languages: Typescript, Javascript, Java, Sql, Html, Css
- Frontend: React, Next.Js, Tailwind, Shadcn, Tanstack Query, Zustand
- Templating & Ssr: Thymeleaf, Server-Side Rendering With Next.Js, Server-Rendered Views
- Design Systems: Design Tokens, Storybook, Chromatic, Accessibility, Ui Libraries
- Mobile: React Native, Expo, Eas, Over-The-Air Updates, App Store Connect, Play Console
- Backend & Apis: Java Spring Boot, Node.Js, Rest, Openapi, Scalar, Betterauth
- Data: Postgresql, Prisma, Drizzle, Jupyter Notebooks
- Infrastructure & Operations: Docker, Coolify, Hetzner, Terraform, Self-Hosting, Cron Jobs
- Ci/Cd & Code Quality: Github Actions, Jenkins, Eslint, Prettier, Oxlint, Husky, Renovate
- Testing & Observability: Vitest, Playwright, Chromatic, Sentry, Grafana Cloud
- Ai-Assisted Development: Claude Code, Codex, Mcp
- Product & Growth: Meta Ads, Revenuecat, In-App Purchases, Product Analytics, Event Tracking
Languages
Education
IT Specialist for Application Development · Application Development
Statistics
Experience
Global experience
Expertise
Profile
Frequently asked questions
Have questions? Find more information here.
Ingo is based in Solingen, Germany.
Ingo speaks the following languages: German (Native), English (Intermediate).
Ingo has at least 11 years of experience. During this time, Ingo has worked in at least 6 different roles and for 4 different companies. The average length of individual experience is 2 years and 11 months. Note that Ingo may not have shared all experience and actually has more experience.
Based on recent experience, Ingo would be well-suited for roles such as: Co-Founder & Managing Director, Full-Stack Developer, Software Developer – Applied Technology Research.
Ingo's most recent position is Co-Founder & Managing Director at Elterngeld Buddy GmbH.
In recent years, Ingo has worked for Elterngeld Buddy GmbH, sipgate GmbH, and TIMOCOM GmbH.
Ingo is most experienced in industries like Information Technology, Transportation, and Telecommunication. Ingo also has some experience in Government and Administration, Automotive, and Insurance.
Ingo is most experienced in business areas like Information Technology, Product Development, and Marketing. Ingo also has some experience in Research and Development.
Ingo has recently worked in industries like Information Technology, Telecommunication, and Government and Administration.
Ingo has recently worked in business areas like Information Technology, Product Development, and Marketing.
Ingo attended education in Application Development.
Ingo will be available part-time from October 2026.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 13 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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