Freelancer profile translated to English.
Back to original languageAbout Marc
As a Senior Fullstack Developer with a focus on TypeScript, I bring over 8 years of experience in developing fast, reliable, and thoughtfully designed web applications. I place great importance on the small, invisible details that many developers overlook – because it is precisely these that elevate a good product to the next level.
What sets me apart is not only my technical competence but, above all, my mindset: I develop solutions for real problems, pay meticulous attention to detail, and consciously keep things simple. I deliver code that remains stable in production-critical systems for years because I focus on clarity, testability, and extensibility from the outset.
German
Native or bilingual
English
Fluent
French
Conversational
Spanish
Conversational
Can work on-site
Berlin (up to 50km)
Experience
- Marc NitzscheIndependent Software DeveloperSeptember 2022 - Today (3 years and 9 months)Berlin, GermanyImplementation of meaningful software projects for startups and blockchain clients. Responsible for the entire development cycle: from idea generation and conception to full-stack implementation and deployment. Agile working method with a special focus on rapid iterations, clear user guidance, GDPR compliance, and robust backend systems. Project examples:
- **Second Screen App for Live Game Show**: Development of an interactive web application for a live game show with over 800 concurrent viewers. Focus on performance, intuitive UX, and easy extensibility.
- **SaaS MVP for Visual Feedback on Websites**: Leading product design and prototyping of a B2B tool that enables teams to provide context-specific feedback on live websites. Conducting early user interviews and validation.
- **Blockchain R&D – Ethereum Blobspace Optimization**: Development and testing of new approaches to reduce the cost of blobspace on Ethereum. The prototypes contributed to the client receiving six-figure funding from Uniswap and Arbitrum.
- **Landing Pages & CMS Integration for Various Clients**: Development of performant, SEO-optimized landing pages with headless CMS. Provision of editable templates that can be flexibly maintained by marketing and content teams.
- **Serverless Report Automation**: Building an automated pipeline for financial reports using serverless functions. Reduction of monthly reporting time by several hours. Focus on efficiency and ROI-driven prioritization.
- **Progressive Web App for Audio Data Annotation**: Development of a cross-platform PWA for structured annotation of audio recordings with time data.
- flowkey,Senior Software EngineerJune 2020 - July 2022 (2 years and 1 month)flowkey is an app that helps millions of people worldwide learn piano online in an intuitive, interactive, and effective way. After its launch in 2015, it quickly became one of the global market leaders in music education with over 5 million users from more than 100 countries.
- Led the redesign and rebuild of the flowkey website with Next.js + Headless CMS, improving SEO and user experience in more than 4 global markets.
- Refactored and migrated the payment, auth, and frontend systems to a GraphQL backend, reducing backend complexity and accelerating and securing the delivery of new features.
- Automated internal workflows using serverless functions and Slack bots, saving over 10 hours per month on repetitive tasks and enabling focus on more strategic work.
- Implemented a GDPR-compliant cookie consent system while maintaining website speed and conversion rates.
- Mentored junior developers and conducted detailed code reviews, increasing overall code quality and confidence in deployments across multiple teams. Gave internal talks to improve engineering fundamentals on topics such as P/NP, Node.js streams, or compiler construction.
- flowkey,Software EngineerJune 2018 - June 2020 (2 years)flowkey is an app that helps millions of people worldwide learn piano online in an intuitive, interactive, and effective way. After its launch in 2015, it quickly became one of the global market leaders in music education with over 5 million users from more than 100 countries.
- Led the redesign and rebuild of the flowkey website with Next.js + Headless CMS, improving SEO and user experience in more than 4 global markets.
- Refactored and migrated the payment, auth, and frontend systems to a GraphQL backend, reducing backend complexity and accelerating and securing the delivery of new features.
- Automated internal workflows using serverless functions and Slack bots, saving over 10 hours per month on repetitive tasks and enabling focus on more strategic work.
- Implemented a GDPR-compliant cookie consent system while maintaining website speed and conversion rates.
- Mentored junior developers and conducted detailed code reviews, increasing overall code quality and confidence in deployments across multiple teams. Gave internal talks to improve engineering fundamentals on topics such as P/NP, Node.js streams, or compiler construction.
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Education
- BAHumboldt University Berlin2022Informatik
- BAUniversity of the Arts Berlin2022Musik