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Franz SauerwaldFS

Franz Sauerwald

Product-minded Full-Stack Engineer

€700/day
Berlin, DE
3-7 years

Average response time: 1 hour

About Franz

I help teams move faster by taking ownership of full-stack features from idea to production — with clear communication, pragmatic decisions, and a strong focus on business value. With 5+ years of experience across modern web applications, backend systems, and product-focused development, I can quickly understand complex requirements and turn them into reliable, maintainable software.

My core stack includes TypeScript, React, Next.js, Node.js, and NestJS. I enjoy working end-to-end: shaping requirements, designing architecture, building clean user interfaces, developing APIs, integrating external services, and bringing features into production.

I use modern AI tools as part of my development workflow to work faster, validate ideas, improve quality, and reduce repetitive work. Where it makes sense, I can also support teams with practical AI integrations, automation, document processing, and data-driven workflows — always with a focus on real value rather than hype.

I’m a good fit for teams looking for a product-minded full-stack engineer who can contribute independently, communicate clearly, and help ship meaningful features without needing constant guidance.
  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Berlin (up to 50km)

Experience

  • neXenio Engineering
    Software Engineer
    July 2022 - Today (4 years)
    • Designed and built a reliable data-processing pipeline using Python, Airflow, and Pandas for a logistics system handling 5 million shipments per year.
    • Built and improved the accompanying user-facing application and backend services using TypeScript, React, NestJS, and JWT-based authentication.
    • Reworked synchronization and billing for neXboard, a real-time collaborative whiteboard deployed in education and the public sector, using React, Node.js, and PostgreSQL.
    • Implemented hybrid post-quantum cryptography flow, including key management and encryption workflows, in a WebAssembly demonstrator to display real-world usability.
  • Self-employed
    Freelance Web Developer
    March 2016 - July 2022 (6 years and 4 months)
    • Implemented an automated application-processing workflow with AI document analysis and OCR, reducing manual effort by approximately 60%.
    • Developed an interactive children's storytelling platform with branching, multimedia-rich narratives using Angular and Google Cloud as part of an international team.
    Node.js Typescript Google cloud Angular SQL/NoSQL
  • New Path Solutions GmbH
    App Developer
    November 2020 - March 2022 (1 year and 4 months)
    • Delivered customer-facing features for Carmino, a CO2e-estimating mobile app that detects transport mode and distance, using Flutter, GraphQL, and Node.js.
    • Implemented a native iOS widget and integrated mobile app functionality with backend services to improve the user experience.
    Flutter Node.js PostgreSQL GraphQL

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Education

  • M.Sc. IT-Systems Engineering
    Hasso Plattner Institute
    2026
    Grade "very good"
  • B.Sc. IT-Systems Engineering
    Hasso Plattner Institute
    2022
    Grade "very good"

Certifications

  • Certified STACKIT Cloud Engineer Fundamentals
    STACKIT
    2026
    Cloud computing Cloud Engineer STACKIT
  • Mobile Web Specialist Nanodegree Program
    Udacity
    2017
    Accessibility Node.js PWA React.js

Skill set

Categories