Available to hire
With over 18 years of experience in software development, including more than 15 years as a freelance developer, I bring a broad spectrum of skills and expertise. As a full-stack developer, I work across both frontend and backend to design and build robust web applications, and I have hands-on experience in Android development as well.
I have collaborated with renowned companies such as Continental, Bosch, Audi, Meiller, DWS/Morgenfund, Flextronics, Dallmeier Electronics, BDT, Smart InsureTech, and Inverso. I also authored a book on programming principles and consistently emphasize clean code, SOLID, and practical design patterns. My experience spans Java, Kotlin, C#, C++, Angular, HTML5, CSS3, JavaScript, PHP, TypeScript, and Delphi, and I routinely develop RESTful and SOAP interfaces while prioritizing maintainable, future-proof software.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Language
German
Fluent
English
Fluent
Work Experience
Freelance Full-Stack & Web Developer at Self-employed
January 1, 2009 - PresentDelivered end-to-end web solutions across industries with core responsibilities including API-first design, microservices, containerization, DevOps pipelines, and responsive front-ends. Worked with companies in automotive and manufacturing (Continental, Audi, Bosch), finance and insurance (DWS/Morgenfund, Inverso, Smart InsureTech, Fondsdepotbank), and technology and services (Flextronics, Secodym, BDT, First Soft Solutions).
Technical Author at Self-employed
December 31, 2024 - July 29, 2025Authored "Principles of Programming", a Java-centric guide to Clean Code, SOLID, and KISS with hands-on examples.
Android Developer at First Soft Solutions
March 1, 2025 - July 29, 2025Conceptualized, built, and evolved the “Learning Machine” app using Java/Kotlin, Android Studio, Billing API, Text-to-Speech, SQLite, and Google Play deployment. Added new features, responsive UI, JSON-driven portfolio website, expanded app features including swiping effects and billing integration. Used Agile methodologies (Scrum/Kanban), version control (Git), Docker/Kubernetes, and rigorous testing (Unit, TDD).
Freelance Full-Stack & Web Developer at Self-employed / Freelance
January 1, 2009 - PresentDelivered end-to-end web solutions across industries with API-first design, microservices, containerization, DevOps pipelines and responsive front-ends.
Teaching - Web Development at DCI Digital Career Institute
August 1, 2025 - PresentTeaching modern web development focusing on full-stack technologies (JavaScript, Node.js, HTML5, CSS3, React, Express, MongoDB).
XML-based Trigger Management / MKS → IMS Migration at Continental
December 31, 2016 - September 23, 2025XML-based trigger management, MKS → IMS migration.
Production System Planning / Performance Analysis at Audi
December 31, 2015 - September 23, 2025Production system planning, performance analysis.
Internal Angular 16 Web App / SOLID & Design Patterns at Bosch
December 31, 2024 - September 23, 2025Internal Angular 16 web app, SOLID and design patterns, responsive UI.
Front-end / Back-end Enhancements at DWS/Morgenfund
December 31, 2023 - September 23, 2025Front-end/back-end enhancements, Azure/MSSQL.
IBM WebSphere DevOps / Performance Tuning at Inverso
December 31, 2020 - September 23, 2025IBM WebSphere DevOps, performance tuning.
Java/SOAP Services / DevOps Management at Smart InsureTech
December 31, 2018 - September 23, 2025Java/SOAP services, DevOps management.
Full-Stack Maintenance of Financial Market Portal at Fondsdepotbank
December 31, 2017 - September 23, 2025Full-stack maintenance of financial market portal.
Linux-console Replacement with AngularJS/Node.js at Flextronics
December 31, 2017 - September 23, 2025Linux-console replacement with AngularJS/Node.js.
JavaFX GUI / Neo4j Integration at Secodym
December 31, 2022 - September 23, 2025JavaFX GUI, Neo4j graph-database integration, Java/JavaFX.
Touchscreen HMI / PHP & C++ Interfaces at BDT
December 31, 2013 - September 23, 2025Touchscreen HMI, PHP/C++ interfaces, Jira/Confluence.
Portfolio Website - First Soft Solutions at First Soft Solutions
March 31, 2025 - September 23, 2025Portfolio Website PHP, responsive design, multi-language.
Android Developer at Self-employed / Learning Machine project
December 31, 2025 - September 23, 2025Conceptualized, built, and evolved the Learning Machine app using Java/Kotlin, Android Studio, Billing API, Text-to-Speech, SQLite, and Google Play deployment.
Technical Author at Self-employed
December 31, 2024 - September 23, 2025Wrote Principles of Programming: a Java-centric guide to Clean Code, SOLID, and KISS, with hands-on examples.
Freelance Full-Stack & Web Developer at Freelance / Self-employed
January 1, 2009 - PresentDelivered end-to-end web solutions across industries with API-first design, microservices, containerization, DevOps pipelines, and responsive front-ends.
Android Developer at Self-employed / Freelance
January 1, 2025 - September 23, 2025Conceptualized and built the Learning Machine Android app using Java/Kotlin, Android Studio, Billing API, Text-to-Speech, SQLite, and Google Play deployment.
Teaching at DCI - Digital Career Institute
August 1, 2025 - PresentTeaching modern web development focusing on full-stack technologies such as JavaScript, Node.js, HTML5, CSS3, React, Express, and MongoDB.
Technical Author at Self-employed
December 31, 2024 - September 23, 2025Wrote Principles of Programming: a Java-centric guide to Clean Code, SOLID, and KISS, with hands-on examples.
Continental at Continental (Automotive & Manufacturing)
December 31, 2016 - September 23, 2025XML-based trigger management and MKS to IMS migration activities; contributed to system integration planning.
Audi at Audi
December 31, 2015 - September 23, 2025Production system planning and performance analysis; optimization of manufacturing workflows.
Bosch at Bosch
December 31, 2024 - September 23, 2025Internal Angular 16 web app development focusing on SOLID and design patterns and responsive UI.
DWS/Morgenfund at DWS/Morgenfund
December 31, 2023 - September 23, 2025Front-end/back-end enhancements, Azure/MSSQL – performance tuning and portal improvements.
Inverso at Inverso
December 31, 2020 - September 23, 2025IBM WebSphere DevOps, performance tuning and modernization tasks.
Smart InsureTech at Smart InsureTech
December 31, 2018 - September 23, 2025Java/SOAP services, DevOps management for insurance tech solutions.
Fondsdepotbank at Fondsdepotbank
December 31, 2017 - September 23, 2025Full-stack maintenance of financial market portal; integrated front-end with back-end services.
Flextronics at Flextronics
December 31, 2017 - September 23, 2025Linux-console replacement with AngularJS/Node.js; modernization of tooling.
Secodym at Secodym
December 31, 2022 - September 23, 2025JavaFX GUI with Neo4j graph-database integration; Java/JavaFX development.
BDT at BDT
December 31, 2013 - September 23, 2025Touchscreen HMI, PHP/C++ interfaces; project coordination via Jira/Confluence.
First Soft Solutions at First Soft Solutions
December 31, 2024 - September 23, 2025Portfolio website PHP, responsive design, multi-language support.
Freelance Full-Stack & Web Developer at Self-employed / Freelance
January 1, 2009 - PresentDelivered end-to-end web solutions across industries, focusing on API-first design, microservices, containerization, DevOps pipelines, and responsive front-ends.
Instructor – Web Development at DCI - Digital Career Institute
August 1, 2025 - PresentTeaching modern web development focusing on full-stack technologies such as JavaScript, Node.js, HTML5, CSS3, React, Express, and MongoDB.
XML-based Trigger Management / Migration Specialist at Continental
December 31, 2016 - September 23, 2025XML-based trigger management, MKS → IMS migration.
Production System Planning / Performance Analysis at Audi
December 31, 2015 - September 23, 2025Production system planning and performance analysis.
Internal Angular 16 Web App Developer at Bosch
December 31, 2024 - September 23, 2025Internal Angular 16 web app development; applying SOLID principles and design patterns; responsive UI.
Frontend/Backend Enhancements at DWS/Morgenfund
December 31, 2023 - September 23, 2025Frontend/backend enhancements; Azure/MSSQL integration.
IBM WebSphere DevOps / Performance Tuning at Inverso
December 31, 2020 - September 23, 2025DevOps with IBM WebSphere; performance tuning.
Java/SOAP Services Developer / DevOps at Smart InsureTech
December 31, 2018 - September 23, 2025Java/SOAP services; DevOps management.
Full-Stack Maintenance at Fondsdepotbank
December 31, 2017 - September 23, 2025Full-stack maintenance of financial market portal.
Linux Console Replacement at Flextronics
December 31, 2017 - September 23, 2025Linux-console replacement with AngularJS/Node.js.
JavaFX GUI Developer / Neo4j Integration at Secodym
December 31, 2022 - September 23, 2025JavaFX GUI; Neo4j graph-database integration; Java/JavaFX.
Touchscreen HMI / Interfaces at BDT
December 31, 2013 - September 23, 2025Touchscreen HMI, PHP/C++ interfaces; Jira/Confluence.
Portfolio Website Development at First Soft Solutions
December 31, 2024 - September 23, 2025Portfolio website in PHP; responsive design; multi-language.
Freelance Full-Stack & Web Developer at Self-employed / Freelance
January 1, 2009 - PresentDelivered end-to-end web solutions across industries. Core responsibilities include API-first design, microservices, containerization, DevOps pipelines, and responsive front-ends.
Teaching / Web Development Instructor at DCI - Digital Career Institute
August 1, 2025 - PresentTeaching modern web development focusing on full-stack technologies such as JavaScript, Node.js, HTML5, CSS3, React, Express, and MongoDB.
Software Engineer at Continental
December 31, 2016 - October 26, 2025XML-based trigger management, MKS → IMS migration.
Software Engineer / Production Systems at Audi
December 31, 2015 - October 26, 2025Production system planning, performance analysis.
Software Engineer at Bosch
December 31, 2024 - October 26, 2025Internal Angular 16 web app, SOLID and design patterns, responsive UI.
Frontend/Backend Developer at DWS/Morgenfund
December 31, 2023 - October 26, 2025Front-end/back-end enhancements, Azure/MSSQL.
DevOps / WebSphere Specialist at Inverso
December 31, 2020 - October 26, 2025IBM WebSphere DevOps, performance tuning.
Java Developer / DevOps at Smart InsureTech
December 31, 2018 - October 26, 2025Java/SOAP services, DevOps management.
Full-stack Developer at Fondsdepotbank
December 31, 2017 - October 26, 2025Full-stack maintenance of financial market portal.
Linux Console Replacement Lead at Flextronics
December 31, 2017 - October 26, 2025Linux-console replacement with AngularJS/Node.js.
Java / Neo4j GUI Integration at Secodym
December 31, 2022 - October 26, 2025JavaFX GUI, Neo4j graph-database integration , Java/JavaFX.
Software / HMI Interfaces at BDT
December 31, 2013 - October 26, 2025Touchscreen HMI, PHP/C++ interfaces , Jira/Confluence.
Freelance Web Developer at First Soft Solutions
March 31, 2025 - October 26, 2025Portfolio Website PHP , responsive Design , multi-language.
Android Developer at Learning Machine (self-initiated project)
December 31, 2025 - October 26, 2025Conceptualized, built, and evolved the Learning Machine app using Java/Kotlin, Android Studio, Billing API, Text-to-Speech, SQLite, and Google Play deployment.
Technical Author at Self-employed
December 31, 2024 - October 26, 2025Wrote Principles of Programming: a Java-centric guide to Clean Code, SOLID, and KISS, complete with hands-on examples.
Education
Master of Science at Technical University at Freiberg
June 1, 2004 - November 15, 2005Master of Science at Technical University at Freiberg
January 1, 2002 - May 1, 2005Master of Science in Network Computing at Technical University at Freiberg
January 11, 2030 - May 1, 2005Certificate in English Language Proficiency at Language Academy in Fort Lauderdale
January 11, 2030 - May 1, 2007Master of Science in Network Computing at Technical University at Freiberg
January 11, 2030 - May 1, 2005Certificate in English Language Proficiency at Language Academy in Fort Lauderdale
January 11, 2030 - May 1, 2007Master of Science in Network Computing at Technical University at Freiberg
January 11, 2030 - May 1, 2005Certificate in English Language Proficiency at Language Academy in Fort Lauderdale
January 11, 2030 - May 1, 2007Master of Science in Network Computing at Technical University at Freiberg
January 11, 2030 - May 1, 2005Certificate in English Language Proficiency at Language Academy in Fort Lauderdale
January 11, 2030 - May 1, 2007Qualifications
Certificate in English Language Proficiency
January 11, 2030 - May 1, 2007Principles of Programming: a Java-centric Guide to Clean Code, SOLID, and KISS
January 1, 2024 - September 23, 2025Certificate in English Language Proficiency
January 11, 2030 - May 1, 2007Industry Experience
Manufacturing, Financial Services, Software & Internet, Education, Professional Services, Media & Entertainment
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
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