Andreas S.-Freelance Software Developer
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Experience
Mobile and Web Portal Full-Stack Development (Freelance)
- Maintained and further developed a web portal and mobile app as a full-stack developer.
- Handled customer requests and fixed bugs.
- Implemented REST APIs and database access using Java Spring.
- Maintained and expanded a web frontend with AngularJS.
- Maintained and expanded an iOS and Android mobile app with Qt/C++/Qml, including updating the app in the respective stores.
- Technologies: Qt/C++/QML, AngularJS, Java Spring, MongoDB, OAuth.
Full-Stack Web Portal Development (Logistics)
- Maintained and further developed a web portal in the logistics sector as a full-stack developer.
- Implemented backend logic and REST APIs with ASP.NET core, SQL, and Entity Framework.
- Implemented the login process with JWT and token refresh.
- Implemented the web frontend with Blazor.
- Technologies: C#/.NET, Blazor, ASP.NET core, SQL, Entity Framework, JWT.
Backend Modernization (Banking)
- Member of the internal Scrum team as a backend developer.
- Implemented REST APIs, business logic, and database access using C#/.NET Entity Framework and LINQ.
- Configured and customized the application using JavaScript.
- Technologies: C#/.NET, ASP.NET core, SQL, Entity Framework, LINQ, NUnit, JavaScript, Scrum.
Head of Software Development
Traxon Technologies Europe GmbH
- Led an international team of 12 (DE, HK, Shanghai). Ensured the time-to-market for new lighting control products.
- Implemented and standardized Azure DevOps build pipelines (CI/CD) to automate tests and store uploads, reducing deployment time and improving process reliability. Expanded test automation.
- Successfully introduced Flutter as the cross-platform standard, including building and training a new UI development team in Shanghai to increase development efficiency.
- Designed and implemented the core lighting control software (C#/WPF) and related cross-platform UIs for web, iOS, and Android (Flutter).
- Technologies: Scrum, Jira, Git, Azure DevOps, MS Appcenter, C#/.NET, WPF, XAML, ASP.NET core, Xamarin, C++, Flutter, Flutter_test, Mockito, Flutter integration_test, REST, mqtt, gRPC, SignalR, JSON, InfluxDB, Linux (Raspberry Pi), Docker.
Full Stack Senior Software Developer
Traxon Technologies Europe GmbH
- Designed and developed an automation framework for lighting control.
- Designed and implemented the central lighting control software (C#/WPF).
- Technologies: Visual Studio 2017, C#/.NET, WPF, XAML, NUnit, C++, Scrum, Jira, Git, Linux (Raspberry Pi).
Full Stack Software Developer
BST International GmbH
- Evaluated Qt as the basis for future products.
- Developed a PC software framework using Qt C++/QML to control a line-scan camera and perform image processing tasks.
- Designed and developed a network-transparent data layer for interprocess communication.
- Designed the interprocess communication layer and task control between the GUI and measurement applications.
- Developed line-scan camera software for error detection in the printing process (GUI in C# WPF).
- Technologies: Visual Studio 2015, C++, Qt/QML, Team Foundation Server, Qt Creator, C#/.NET, WPF, NUnit, Test-driven development, CUDA.
Backend Software Developer
dSPACE GmbH
- Developed a test-driven backend to connect modeled Matlab tasks to a real-time operating system (control engineering).
- Focused on specification, implementation, and automated component testing.
- Technologies: Visual Studio 2008, C#/.NET, C++, Matlab, Python, XML, NUnit, Test-driven development, MKS.
Backend Software Developer
AZ Direct GmbH part of Bertelsmann Marketing Services
- Developed high-performance address validation software.
- Analyzed and optimized performance.
- Technologies: Visual Studio 2005, Intel V-Tune, ANSI C++, XML, MySQL.
Full Stack Software Developer
ISRA Vision Lasor GmbH
- Developed image processing software for surface inspection and commissioned systems at customer sites in Germany and abroad.
- Developed line-scan camera software for error detection in the glass manufacturing process.
- Took on responsibility for my own projects starting in 04.2004.
- Technologies: Visual Studio 6.0, C++, MFC, DCOM/ATL, TCP/UDP – IP, OPC.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Manufacturing, Automotive, Information Technology, Banking and Finance, Transportation, and Advertising.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, and Quality Assurance.
Summary
Experienced software developer and tech lead with over 20 years of expertise in designing, architecting, and implementing complex backend and full-stack solutions. Specialized in C#/.NET, C++, and Flutter/cross-platform development. Proven leadership skills in managing international development teams and establishing agile processes (Scrum, DevOps).
Skills
- Rest Apis
- Mobile Applications
- Continuous Integration And Continuous Delivery (Ci/Cd)
Languages
Education
FH Bielefeld
Diplom-Ingenieur (FH) · Electrical Engineering and Information Technology · Bielefeld, Germany
Siemens AG
Training as an Energy Electronics Technician (Industrial Systems) · Energy Electronics Technician (Industrial Systems)
Statistics
Experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
Andreas is based in Lage, Germany and can operate in on-site, hybrid, and remote work models.
Andreas speaks the following languages: German (Native), Greek (Intermediate), English (Intermediate).
Andreas has at least 24 years of experience. During this time, Andreas has worked in at least 7 different roles and for 5 different companies. The average length of individual experience is 3 years and 9 months. Note that Andreas may not have shared all experience and actually has more experience.
Based on recent experience, Andreas would be well-suited for roles such as: Mobile and Web Portal Full-Stack Development (Freelance), Full-Stack Web Portal Development (Logistics), Backend Modernization (Banking).
Andreas's most recent position is Mobile and Web Portal Full-Stack Development (Freelance).
In recent years, Andreas has worked for Traxon Technologies Europe GmbH.
Andreas is most experienced in industries like Manufacturing, Automotive, and Banking and Finance. Andreas also has some experience in Information Technology, Advertising, and Media and Entertainment.
Andreas is most experienced in business areas like Information Technology, Product Development, and Project Management. Andreas also has some experience in Quality Assurance.
Andreas has recently worked in industries like Manufacturing, Banking and Finance, and Information Technology.
Andreas has recently worked in business areas like Information Technology and Product Development.
Andreas holds a Bachelor in Electrical Engineering and Information Technology from FH Bielefeld.
Andreas will be available full-time from January 2027.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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