Freelancer profile translated to English.

Description

Is your system too slow? Is your legacy software holding you back? Or do you need someone to turn complex requirements into working solutions?

With over **25 years of experience**, I help small and medium-sized businesses build and modernize business-critical software – from planning to deployment.

What sets me apart:

*Making complexity tangible:I extract the core from existing over-engineered solutions and explain technical concepts understandably.

*Fast feedback cycles:Push-to-deploy workflows and short iterations mean faster time-to-market and less risk for you.

*Measurable project successes:10x higher throughput for critical systems, 3x faster performance, 95% test coverage.

My Tech Stack:

Backend: Rust, Kotlin (Mobile + Java integration), TypeScript/Node.js, Python if desired.
Frontend: TypeScript, React.
DevOps: CI/CD, Docker, Kubernetes, AWS.
Focus: Strongly typed languages for productive and performant development.

How I can help you:

*Greenfield Projects:From architecture to implementation to production operation.

*Brownfield Modernization:Gradually improve existing systems without rewriting everything.

*Performance Optimization:Analyze slow systems and make them measurably faster.

*API Development:REST APIs with OpenAPI for internal tools or customer interfaces.

*Team Support:Code reviews, mentoring, technical documentation.

My Approach:

Customer-oriented and pragmatic. Extreme Programming principles: Test-driven where sensible, continuous deployment, close collaboration. Solutions are transferable across industries.

Projects: Short to medium-term, flexible as needed.

Languages: German (Native), English (C2)

Let's talk about your project – straightforward and on equal footing.

Industry field of expertise

Languages

English
Fluent
German
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Rauch
Freelance Software Engineer
EDUCATION AND E-LEARNING
July 2024 - Today (2 years and 1 month)
Pfaffenhofen an der Ilm, Germany
For a large university: Planning and development of a web-based survey system with automatic speech recognition and participant management.
Planning and development of network and IoT monitoring components, timeseries storage components for these components, and a React.js-based configuration interface.
HTML5 Rust React.js Project Management Typescript
tribe29
Senior Software Engineer
DIGITAL AND IT
September 2019 - June 2024 (4 years and 9 months)
München, Germany
- Improved automation of Checkmk by designing and implementing a REST API based on OpenAPI.
- Led architectural changes to enhance scalability and maintainability.
- Collaborated with end users and management to expand the API feature set.
- Provided customer support and onboarding for the REST API within the team.
- Reduced implementation errors by refining architecture and user interfaces.
- Strengthened software reliability through vulnerability analysis and conversion tool development.
- Increased development efficiency by introducing new technologies and frameworks.
- Participated in candidate evaluations to support engineering team growth.
Python REST Software Architecture Redis
Stylight GmbH
Senior Lead Software Engineer
FASHION AND COSMETICS
June 2012 - June 2019 (7 years)
München, Germany
- Co-owned and operated a mission-critical infrastructure component central to the company’s value chain.
- Led technical interviews and contributed to hiring decisions, ensuring high engineering standards and team fit.
- Built a scalable web UI framework used across internal tools, improving development speed and consistency.
- Designed and implemented a new image processing pipeline architecture:
• Increased throughput by 10× and significantly reduced memory usage.
• Created and published the Python library “paipa” (available on pypi.org) to support the pipeline.
- Rebuilt the product import system with a focus on testability and scalability:
• Achieved over 95% test coverage and tripled processing performance.
- Led migration of key system components to AWS, enabling:
• Autoscaling, self-healing infrastructure, and streamlined push-to-deploy workflows.
Python Amazon Redshift AWS Kinesis Amazon Web Services