Erhan Y.
Freelance Software Developer
Experience
Jan 2007 - Nov 2018
11 years 11 monthsFreelance Software Developer
Commerzbank
- Development of a new ASP.NET web application for real estate financing
- Maintenance and both functional and technical enhancements (expanding to other loan types, integrating various services, developing custom web services)
- Analysis of business requirements in close cooperation with business departments
- Creation of IT concepts and technical documentation
- Development in backend and frontend
- Design and implementation of automated build, deployment, and test processes
- Writing scripts for automated generation of data access layers (C# classes and SQL scripts) and integrating them into build and deployment processes
Oct 2006 - Dec 2006
3 monthsFreelance Software Developer
Software development company for Pfizer
- ASP.NET development in a portal environment: building ASP.NET applications to map internal company processes
- Languages: C#
- Technologies: ASP.NET, Plumtree Portal Server, MS SQL Server
- Tools: Visual Studio .NET 2003, Visual SourceSafe
Jul 2006 - Aug 2006
2 monthsFreelance Software Developer
Software development company for Pfizer
- Portal migration: migrating ASP applications to ASP.NET as part of a portal migration
- Creating target and implementation concepts, implementation, testing
- Languages: C#
- Technologies: ASP.NET, Plumtree Portal Server, MS SQL Server
- Tools: Visual Studio .NET 2003, Visual SourceSafe
Jan 2003 - Dec 2005
3 yearsFreelance Software Developer
Sinius GmbH
- Rollout Management Software (05/2005 – 12/2005): designed and developed a web-based rollout management software based on ASP.NET with Oracle integration
- Site inspection software (03/2005 – 12/2005): developed a web-based site inspection software with ASP.NET, XML web services, and smart clients connected to Oracle
- Patch and build management software (01/2005 – 04/2005): designed and developed a system for managing build and patch information
- System Configuration and Management System (01/2003 – 06/2005): developed a system for installation, configuration, software distribution, Citrix farm configuration, and inventory (hardware, software, users) for Windows systems
Jul 1999 - Present
26 years 2 monthsFreelance Software Developer
Self-employed
- Training – mainly in the area of Microsoft technologies
- Azure
- New .NET technologies (up to .NET 9, C# 13)
- Various personal projects for private use or practice
- Small applications interacting with various APIs (e.g., bitcoin.de, IG, Todoist)
- Extracting and presenting information from iPhone backups and third-party apps
- Languages: C#, PowerShell, Python
- Technologies: Azure, .NET Core, .NET 6-9, WPF, MVVM, Blazor, Git, Docker, WSL, Web API, Entity Framework, SQLite, MS SQL Server
- Tools: Visual Studio 2019-2022, Visual Studio Code, Postman, GitHub
Nov 1998 - Dec 2002
4 years 2 monthsFreelance Software Developer
Sinius GmbH/Deutsche Bank AG
- Participated in various projects in development, automation, and systems management
Feb 1998 - Jun 1999
1 year 5 monthsSystems Management Consultant
SerCon GmbH
Mar 1995 - Dec 1997
2 years 10 monthsSystem Developer
SRZ Rheinland GmbH
Summary
- Professional experience since 1995. First as a developer at Sparkassen Rechenzentrum Rheinland GmbH, later as a consultant at SerCon GmbH
- Freelance software developer since 1999. Main assignments: Commerzbank (12 years), Deutsche Bank (7 years)
- Specialization in Microsoft technologies since 2003
- Fullstack developer focusing on Microsoft technologies (C#, .NET Framework up to .NET 9, SQL Server)
- Always up to date through training and private projects.
Languages
German
NativeEnglish
IntermediateTurkish
IntermediateEducation
Sep 1992 - Feb 1995
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Apprenticeship as a Mathematical Technical Assistant · Mathematical Technical Assistant
Certifications & licenses
AZ-900: Microsoft Azure Fundamentals
Microsoft
Microsoft Certified Solution Developer (MCSD) for Microsoft .NET
Microsoft
Microsoft Certified Application Developer (MCAD) for Microsoft .NET
Microsoft
Microsoft Certified Professional
Microsoft
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