Note: This portfolio is for informational purposes only. Freelance services will be offered starting January 1, 2026.
Project History
Long-term engagements, key achievements, and career highlights
On-Premise to AWS Cloud Migration
- Timeframe: April 2024 – April 2025
- Client / Company: Leading German automotive manufacturer (via Rackspace)
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Project Description:
Led large-scale migrations to transfer multiple on-premise systems into AWS Cloud. -
Technologies & Tools:
AWS services, Terraform, GitLab, Java, Spring Boot, Gradle, Docker -
Role & Responsibilities:
• Technical Lead for architecture and implementation
• Designed and optimized CI/CD processes with GitLab
• Deployed secure and scalable AWS infrastructures -
Outcomes & Results:
Ensured high performance, security, and compliance in the new cloud environment
Building & Leading a Dev Team – Bringmeister.de
- Timeframe: December 2017 – December 2019
- Client / Company: Bringmeister.de
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Project Description:
Established a development team and introduced modern DevOps practices. -
Technologies & Tools:
Kotlin, Java, Spring Boot, AWS, Terraform, Bitbucket Pipelines, GitLab, Docker -
Role & Responsibilities:
• Founded and led a team of 11 developers
• Created a robust architecture with over 30 microservices
• Implemented CI/CD pipelines for automated deployments -
Outcomes & Results:
Reduced deployment time from one month to under 15 minutes; introduced self-healing mechanisms for higher system stability
Optimizing Cloud Architecture – Bringmeister.de
- Timeframe: January 2020 – January 2022
- Client / Company: Bringmeister.de
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Project Description:
Improved the cloud architecture for better scalability and performance. -
Technologies & Tools:
AWS VPC, ECS, API Gateway, CloudWatch, RDS, DynamoDB, Redis -
Role & Responsibilities:
• Advanced the architecture using AWS services
• Introduced new monitoring and alerting systems
• Enhanced cost control and budgeting -
Outcomes & Results:
Reduced deployment errors from 30% to under 5%; optimized cloud costs via reserved resources
Further Development & Scaling – Bringmeister.de
- Timeframe: February 2022 – January 2024
- Client / Company: Bringmeister.de
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Project Description:
Scaled the cloud architecture to accommodate growing user volumes. -
Technologies & Tools:
AWS Lambda, Kinesis, ECS, DynamoDB, Postgres -
Role & Responsibilities:
• Scaled backend services for higher order volumes
• Optimized event streaming and database queries
• Led performance analyses and infrastructure improvements -
Outcomes & Results:
Boosted system performance by 40%, introduced new security measures to protect customer data
Microservices Backend for Element Insurance
- Timeframe: June 2017 – November 2017
- Client / Company: Element Insurance
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Project Description:
Designed and built a microservices-based backend for a white-label insurance solution. -
Technologies & Tools:
Java, Spring Boot, Terraform -
Role & Responsibilities:
• Developed microservices for multiple insurance products
• Introduced DevOps methods using Terraform -
Outcomes & Results:
Successfully launched a scalable, cloud-based architecture for diverse insurance use cases
Infrastructure Migration for welt.de
- Timeframe: June 2013 – June 2015
- Client / Company: Axel Springer SE / welt.de
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Project Description:
Migrated the existing infrastructure to AWS Cloud. -
Technologies & Tools:
Spring Boot, Java, Play, Scala, AWS -
Role & Responsibilities:
• Created microservices for news content
• Introduced a scalable server infrastructure -
Outcomes & Results:
Improved load times by 50%, reduced server costs through efficient resource management
Further Development & Optimization – welt.de
- Timeframe: July 2015 – May 2017
- Client / Company: Axel Springer SE / welt.de
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Project Description:
Optimized and scaled the AWS-based architecture after initial migration. -
Technologies & Tools:
AWS, Kubernetes, Terraform, CloudFront -
Role & Responsibilities:
• Introduced new scaling strategies for high-traffic media
• Improved multimedia integration and performance -
Outcomes & Results:
Reduced infrastructure costs by 30%, boosted performance via CDN optimizations
IT Integration for GK Software AG
- Timeframe: March 2011 – March 2013
- Client / Company: GK Software AG
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Project Description:
Integrated a central IT platform for POS infrastructures across 3,000 stores. -
Technologies & Tools:
SAP, Java, mobile store-management -
Role & Responsibilities:
• Rolled out a unified software solution for all retail branches
• Streamlined system landscapes to improve process efficiency -
Outcomes & Results:
Standardized the IT environment and significantly reduced maintenance overhead
Technical Leadership & Scaling – Finalsoft GmbH
- Timeframe: September 2009 – March 2011
- Client / Company: Finalsoft GmbH
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Project Description:
Established and led a software company focused on content management systems. -
Technologies & Tools:
PHP, Java, MySQL, Apache, Linux -
Role & Responsibilities:
• Co-founder and CTO
• Delivered 30+ projects for various clients -
Outcomes & Results:
Developed a reusable CMS platform and formed a stable dev organization
Software Development for Neofonie & Sofha GmbH
- Timeframe: February 2006 – September 2009
- Client / Company: Neofonie, Sofha GmbH, Oracle Retail
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Project Description:
Built diverse software solutions for media, retail, and customer service. -
Technologies & Tools:
Java, Spring, Swing, HTML, CSS, JavaScript -
Role & Responsibilities:
• Developed an instant messaging client
• Created a touchscreen system for printer control -
Outcomes & Results:
Significantly improved usability through intuitive UI concepts