Patrick Bußmann
Senior Full-Stack Developer
I build scalable web applications and microservice architectures, accelerated by AI, backed by experience.
- Focus
- C#/.NET, PHP/Symfony, Angular, React, TypeScript
- Cloud
- Azure, AWS, Docker, Kubernetes, CI/CD
- Experience
- Self-employed since 2015, coding since age 12
- Work mode
- Remote across the DACH region, on-site by arrangement
- Languages
- German, English
Clients
Companies and organizations across Germany and Austria I have worked with.
- on-geo GmbH
- Bilfinger SE
- KTM AG
- Fielmann AG
- Inwerken AG
- Delticom AG
- HubTime GmbH
- Rockers.de
- Gemeinde Algermissen
Projects
A selection of client projects. More projects and details are in my CV.
| Client | Task and outcome | Technology |
|---|---|---|
| on-geo GmbHProperty valuation | Redesign and modernization of a long-running property valuation application. Migration to current frontend and backend stacks, Playwright test suite set up. | Angular, TypeScript, C#/.NET, Playwright, Azure DevOps, Grafana |
| Bilfinger SEIndustrial services | Modernization of the internal time tracking application: legacy application replaced, TypeScript introduced in the frontend, test suite set up and extended. | React, TypeScript, Node.js, Express, TypeORM, Playwright |
| KTM AGVehicle manufacturer, Austria | Complete rewrite of the management system as a scalable microservice architecture on Azure. Responsible for backend services, the BFF layer and cross-service integration via Kafka and Service Bus. | C#/.NET, Node.js, React, TypeScript, Azure AKS, Helm, Kafka, Service Bus, MassTransit, Azure SQL, Playwright |
| Fielmann AGOptical retail | Payment page for new payment methods across the store network, integrated into the existing payment service and deployed on AWS. | C#/.NET, React, TypeScript, AWS |
| Inwerken AGIT consulting | Ongoing maintenance and development of websites: WordPress, Matomo tracking and analysis, interactive 3D visualizations with Govie. | WordPress, PHP, JavaScript, Matomo, Govie 3D |
| Delticom AGOnline tire retail (ReifenDirekt) | First Alexa skill with Amazon Pay integration rolled out in Germany, officially confirmed by Amazon: buying tires directly via Alexa. | Alexa Skills Kit, TypeScript, Node.js, DynamoDB, Amazon Pay |
Tech Stack
My current stack. Bold is what I work with every day.
| Area | Technologies |
|---|---|
| Languages | C#, PHP, TypeScript, JavaScript, SQL, HTML5, CSS3 |
| Frameworks | .NET, ASP.NET Core, Entity Framework Core, Angular, React, Symfony, Laravel, Node.js, Express, NestJS, TypeORM, Astro |
| Cloud and DevOps | Microsoft Azure, Azure Kubernetes Service (AKS), Azure Service Bus, Azure SQL, Azure OpenAI, Amazon AWS, AWS Lambda, AWS DynamoDB, AWS S3, AWS Cognito, Docker, Kubernetes, GitHub Actions, GitLab CI, Azure DevOps Pipelines (YAML), Hetzner |
| AI tools | Claude, Anthropic API, OpenAI API, Azure OpenAI, ChatGPT, GitHub Copilot, Ollama, Local LLMs, RAG, Embeddings, Prompt Engineering |
| Databases | PostgreSQL, MySQL, SQL Server, Redis, DynamoDB |
| Testing and QA | Playwright, Selenium, Robot Framework, PHPUnit |
| Tools and IDEs | Rider, PhpStorm, WebStorm, VS Code, Git, Raspberry Pi, Shelly |
Not on offer: Java, Kotlin and Delphi.
Services
Senior software development for businesses, from architecture to operations.
Full-stack development
Web applications and microservice architectures in C#/.NET, PHP/Symfony, Angular, React and TypeScript. From concept to deployment.
AI integration
Accelerated development with Claude, ChatGPT and Copilot. Privacy-compliant with local LLMs for sensitive projects.
Cloud and DevOps
Cloud infrastructure on Azure and AWS. Containers with Docker and Kubernetes. CI/CD pipelines and automated deployments.
IT consulting
Workflow analysis and optimization, modernization of legacy systems and digital transformation.
Hosting and operations
Dedicated root servers on Hetzner for project and business clients. Administration, monitoring and maintenance of server infrastructure.
About Me
I started coding at age 12, out of pure curiosity. Since 2015 I have been self-employed, helping businesses of all sizes build modern software. What drives me: simplifying, modernizing and automating things, whether with code, AI tools or smart home technology.
In 2024 I co-founded HubTime GmbH with a partner: a fully automated booking system with 24/7 access and automatic PIN generation.
- years of experience
- 15+
- enterprise projects
- 10+
- self-employed since
- 2015
- average response time
- < 2 h
Frequently Asked Questions
Answers to the most common questions: rates, tech stack, work location.
What services does Patrick Bußmann offer as a freelancer?
Senior full-stack development with C#/.NET, PHP/Symfony, React, TypeScript, Angular and Node.js. Plus cloud and DevOps (Azure, AWS, Hetzner, Docker, Kubernetes), AI-enhanced development (Claude, ChatGPT, Copilot, local LLMs for sensitive data), microservice architectures, test automation with Playwright and Robot Framework, IT consulting and modernization of legacy systems.
What does it cost? What is the hourly rate?
The current freelance rate is €90/hour all-in (as of 04/2026). For long-term engagements or fixed-price projects there are individual terms, best to ask directly.
What does Patrick's availability look like?
Availability for new projects is discussed individually, best to ask briefly by email or phone. Average response time on inquiries is under 2 hours.
Which clients and industries has Patrick worked with?
Enterprise clients include Fielmann, KTM, Bilfinger SE (modernization of internal time tracking with a React and TypeScript frontend and a Node.js/Express/TypeORM backend), on-geo GmbH and Inwerken AG. Plus the public sector (Gemeinde Algermissen) and co-founding HubTime GmbH (fully automated booking system).
Does Patrick work remotely or on-site?
Primarily remote across the DACH region. On-site by arrangement, especially around Hildesheim/Hannover. Based in Algermissen, Lower Saxony, Germany.
Which technologies are not taken on?
Currently no Java, Kotlin or Delphi projects. Pure design or marketing tasks don't fit the profile either, there are better specialists for that.
Who helps with private PC issues, smart home or hardware upgrades?
That is covered by my company Bußmann IT: IT services for private and SMB customers around Hildesheim/Hannover plus a Germany-wide mail-in service for SSD and RAM upgrades.
Contact
Interested in working together or have a matching project? I look forward to your message.