Johannes E.
Additional Freelance Projects
Experience
May 2023 - Present
2 years 4 monthsAdditional Freelance Projects
S|R Software GmbH & Co. KG
- Provided consulting for modernizing legacy applications
- Delivered critical features under tight deadlines for backend and frontend
- Key Technologies: C#, .NET, WPF, WCF, REST, Angular, MS SQL Server
Nov 2022 - Present
2 years 10 monthsFrankfurt, Germany
Freelance Senior Software Engineer
Continental AG (via valantic STI GmbH)
- Designed and implemented distributed, full-stack applications for automated ECU flashing, production control, and system monitoring
- Delivered scalable and maintainable backend and frontend architectures using .NET and Angular
- Built and maintained CI/CD pipelines in Azure DevOps and containerized applications with Docker
- Integrated Blockly to enable configurable, domain-specific workflow logic in production environments
- Key Technologies: .NET 6-9, C#, Angular 2+, WinForms, WPF, Docker, Azure DevOps, REST, RabbitMQ, MQTT, SignalR, Keycloak, PostgreSQL, Oracle, Elasticsearch, Blockly
Feb 2021 - Oct 2022
1 year 9 monthsSenior IT Consultant / Software Developer
valantic STI GmbH
- Delivered software for ECU flashline systems with a focus on cybersecurity at Continental
- Refactored and optimized administrative tools for the City of Frankfurt
- Enhanced internal tools and services
- Key Technologies: C#, WinForms, Blazor, SQL Server, Oracle, Azure DevOps, Azure Cloud
Oct 2019 - Jan 2021
1 year 4 monthsTechnical Project Lead / Software Developer
IQ-Optimize Software AG (1&1)
- Led development of campaign and customer retention tools
- Refactored and optimized a high-volume SIM card ordering application to improve performance and scalability
- Designed data cleanup and archival utilities
- Migrated legacy WinForms to ASP.NET MVC
- Key Technologies: C#, .NET Framework, ASP.NET MVC, WinForms, Informix, MySQL, MS SQL Server, Netezza, Linux/Bash
Jun 2009 - Sep 2019
10 years 4 monthsSoftware Architect & Developer
S|R Software GmbH & Co. KG
- Designed and developed a complete rental, POS, and warehouse management system, including a touch-optimized interface, backend API, and the migration from a monolithic application to a scalable client-server architecture
- Migrated databases from Jet to MS SQL Server with custom tooling
- Integrated various third-party APIs and device drivers
- Key Technologies: WPF, C#, .NET Framework/Core, WCF, ASP.NET, WinForms, VB6, MS SQL Server, Jet, Access, List & Label, SOAP, REST, XML
Sep 2006 - May 2009
2 years 9 monthsSoftware Developer
pawisda systems GmbH
- Developed low-level backend services and drivers for document and print management
- Built a PDF library in C++ and fax server under SuSE Linux
- Key Technologies: C++, C, Tcl/Tk, PostgreSQL, PHP, HTML, NSIS, MSI, SuSE Linux
Jan 2000 - Dec 2006
7 yearsResearch Assistant
FernUniversität Hagen
- tutoring, grading
Jan 2000 - Dec 2006
7 yearsCo-founder
First Aid Computerservice GbR
- IT services and support
Jan 2000 - Dec 2006
7 yearsQA Tester
Sunflowers
- "Anno 1503", "Knights of Honor"
Summary
Senior Software Engineer and Architect with 20 years of experience in designing, developing, and modernizing business-critical applications. Specialized in Microsoft technologies (.NET Core, C#) and modern frontend frameworks like Angular. Extensive experience in full-stack development, technical project leadership, and systems used in the automotive domain. Proven track record in building distributed and scalable solutions for automotive production environments, with a focus on ECU flashing, monitoring, and control systems. Actively seeking challenging freelance or contract roles in high-performance and safety-critical environments.
Languages
German
NativeEnglish
AdvancedRussian
AdvancedEducation
Apr 2004 - Mar 2006
FernUniversität Hagen
Computer Science, Thesis: Algorithm for Best-Fit Rectangle Detection · Computer Science · Hagen, Germany · Very Good
Oct 2000 - Mar 2004
University of Applied Sciences Darmstadt
Computer Science, Thesis: Visualization of Streamlines in VR/AR (with Fraunhofer IGD) · Computer Science · Darmstadt, Germany · Good
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