John Stuppan-Software Engineer
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Experience
Software Engineer
Self-employed
Software Engineer
Lübbering GmbH
Built internal software for complex engineering workflows . Requirements through deployment (.NET, React).
Migrated legacy Visual Basic scripts to C#. Significantly better stability, structured error handling and centralised logging. Maintenance overhead cut considerably.
Designed and built a component-based configuration engine for complex drilling systems, letting sales staff put together full system setups without needing an engineer in the loop.
IT Freelancer
Self-Employed
- Completed over 100 projects for IT service providers and SMEs in web development, automation, and scripting, achieving a 97% positive rating on Fiverr
- Utilised a core stack including React, TypeScript, C#, Python, Node.js, PostgreSQL, and AWS
- Worked with clients across industries on solutions ranging from simple websites to complex B2B integrations
Industry Experience
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Experienced in Information Technology and Manufacturing.
Business Area Experience
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Experienced in Information Technology and Product Development.
Summary
Full-stack developer with over 4 years of experience in web and backend development and automation.
100+ completed contracts for private clients and IT service providers. From React frontends to .NET backends to PowerShell automation in enterprise environments. I work independently, communicate clearly, and always meet deadlines.
Skills
- Frontend: React, Next.js, Typescript, Javascript, Html5, Css3, Tailwind Css
- Backend: C# / .Net, Python (Fastapi, Flask), Node.js, Java / Spring Boot
- Cloud & Devops: Aws, Azure, Docker, Kubernetes, Ci/cd, Git
- Databases: Postgresql, Mysql, Mongodb, Redis
- Other: Rest Apis, Powershell, Opencv, Unity (C#), Selenium, Junit
Languages
Education
Fern University of Hagen
Master of Science, IT Security · IT Security · Hagen, Germany
HSBI – University of Bielefeld
Bachelor of Science, Computer Science · Computer Science · Bielefeld, Germany
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