Andreas G.-Senior Fullstack Developer · .NET & Angular · AI Integration · Cloud · DevOps
Check rate
Experience
Senior Fullstack .NET (Core) & Angular Developer
IT Service Provider
- Supporting several agile teams in the new product development of an enterprise CRM and ERP application
- Web frontend development with Angular 17–21 (microfrontends, Domain-Driven Design, MDB-Bootstrap)
- Backend development with C# and .NET 7–10, MongoDB, MassTransit, RabbitMQ, Entity Framework Core, ElasticSearch (microservices, DDD)
- Technical feature design for assigned tasks
- Technical architecture design including forward-looking planning of AI-supported extension options
- Proof-of-concept implementation of AI-supported workflows with n8n and a locally hosted LLM (Ollama)
- Coordination with stakeholders and Product Owners, support with sprint planning
Result: Delivery of production-ready microservices and frontend modules in agile sprint cycles.
Environment: .NET 7–10 · Angular 17–21 · C# · TypeScript · OpenAPI · Microfrontends · DDD · Kubernetes · Docker · Helm · MS SQL Server · PostgreSQL · MongoDB · MassTransit · RabbitMQ · EF Core · ElasticSearch · Kibana · Azure DevOps · KeyCloak · n8n · Ollama
Senior Fullstack Developer .NET (Core) & Azure Developer Associate
Compliance Management
- New development of a cloud-based compliance management solution in an agile team (SCRUM)
- Setup and use of a containerized Kubernetes application infrastructure (Azure AKS)
- Support in replacing an Azure Service Bus solution with Azure RabbitMQ Server (operations & development)
- Support in replacing Auth0/Okta as an identity and access management solution and migrating to KeyCloak (operations & development)
- Web frontend development (React.js)
- Backend development (.NET Core 6/7 & Entity Framework & Azure MS SQL databases)
- New development of automated GitLab CI/CD pipelines using the HELM package manager for structured and scalable deployment of Kubernetes applications
- Ensuring software quality through the development and use of unit and integration tests as well as SonarQube for statistical quality analysis
- Coordination with stakeholders & Product Owners
- Support with sprint planning
Fullstack Developer .NET (Core) & Angular
Media
- Supporting an agile team in the further development of an enterprise-wide Media Asset Management system for images and videos
- New development of a web-based frontend for media ingestion (SPA, Angular 12)
- Maintenance of additional web-based frontends in use (SPA, Angular 9)
- New development and further development of (micro)services and APIs for the media workflow (.NET 5 & 6, Entity Framework Core, RabbitMQ, Docker, Kubernetes)
- New development and further development of NuGet libraries (.NET Standard 2.1)
Senior Backend Developer .NET Core
Retail / Logistics
- New development of a platform for logistics track & trace processes in retail based on .NET Core and Entity Framework Core
Senior Angular Frontend Developer
Industry
- New development of a roaster management system as a web-based frontend (SPA)
- Implementation of components for roaster configuration (GUI template-driven forms/styles, custom controls CDX)
- Implementation of components for PDF export of documents (pdfmake Angular library)
- Implementation of components for central translation management including export/import functionality (GUI template-driven forms/styles, ExcelJS Angular library)
- Coordination of GUI design with an external design studio
Senior Fullstack Developer
Industry
- Further development of a web-based customer portal dashboard (ASP.NET Web Forms, HTML, jQuery, AJAX, C#, SharePoint 2010/2013)
- New development of a web-based planning and design tool (ASP.NET MVC 4 Razor, HTML5, jQuery, C#)
- New development of cloud-based solutions as part of the Ahead strategy – ActionBoard (Azure Cloud & DevOps, ASP.NET Core, Angular, C#, Typescript, SCSS, EF, Extensible Framework)
- Implementation of SOA architecture (SOAP WCF, REST Swagger) on-premise and in Azure
- Web API design and development
- Database development using MS SQL Server 2012-2016/Azure with T-SQL and CTE
- Unit test development
Senior Fullstack Developer
Bank
- New development and maintenance of specific intranet applications
Senior Fullstack Developer
Industry
- New development of a corporate portal (ASP.NET Webforms, C#, SharePoint)
- Development of web services for data communication (C#)
- Database development using MS SQL Server 2012 with T-SQL and CTE
- Creation of reports with MS SSRS
Senior Fullstack Developer
System House Security
- Frontend development for a new customer product (WPF, XAML, C#)
- Design and implementation of the required business and data layers in C#
Application Developer C#/C++ Windows Embedded Systems
Industry
- Maintenance and further development of components for embedded systems (TVM Ticket Vending Machines) in C# (business layer and GUI) and C++ (hardware layer)
- Code analysis and performance tuning
- Creation of unit tests
Senior Fullstack Developer
Energy Industry
- Design and development of a high-performance SOA for transmitting and processing real-time data from connected wind turbines (OPC DA, OPC XML DA)
- Analysis, design and development of interfaces for connecting and processing aggregated runtime data from alternative power plants
- Maintenance and further development of a Silverlight frontend (Silverlight 4, C#, MVVM)
- Maintenance of existing interface modules (VB.NET, C#)
- Server management via PowerShell Cmdlets
Senior Fullstack Developer
Bank
- Replacement of an existing banking application
- Frontend design and implementation with Telerik RAD Controls (MVC 3)
- Support with data modeling using Entity Framework 4.x
- Development of web and WCF services in C#
- Prototyping of the application to be replaced with WPF (XAML, MVVM)
Technical Architect & Senior Fullstack Developer
Postal Services
- Maintenance and further development of a retail application for branch operations
- Process and data modeling with ARIS
- Analysis, design, architecture
- Migration .NET 1.1 → .NET 2.0 and SQL Server 2000 → 2005
- Development with C#/ASP.NET (.NET 2.0-4.0), WCF, WPF, LINQ, JavaScript, Silverlight 3/4
- Development of automated unit tests
- Development leadership and technical architecture
- Development of customer self-service prototypes (Silverlight, TELERIK, WCF Data Services)
Senior Fullstack Developer
Bank
- Maintenance of a Primanota application (VB6, Oracle 8i, ODBC)
- Migration of a central banking application from VB6 to VB.NET 2005 and Oracle 8i to 10g R2
Backend Developer (Mainframe)
Bank
- Current-state analysis of existing interfaces for national (SIC, EZAG, LSV+) and international (SWIFT, euroSIC) payment transactions
- Creation of functional and technical documentation
- Development of online and batch backend modules with DELTA/COBOL, MQSeries, SQL
- Creation and adaptation of JCL processes for daily processing
- Coordination of test procedures and test environments according to the V-Model
- Test data design, test execution, review, regression testing
Test Developer (MS .NET)
Internet Service
- Creation of test concepts and test scenarios
- Development of automated test cases with C#, ASP.NET, VBScript, NUnit
- Document reviews
- Test execution in C# (IIS, AD, SQL Server, XML, HTTP)
- Load testing with Empirix
- Planning and execution of performance tests
Project Management / Development Coach
Services
- Design of application components
- Coaching the development team
- Project management
- Support with development
Test Developer (MS .NET)
Internet Service
- Creation of test concepts and test scenarios
- Development of automated test cases with C# and NUnit
- Document reviews
- Test execution and bug tracking
- Load and performance testing with Empirix
Fullstack Developer
Association
- Extension of existing data structures
- Migration and new development on the .NET platform
- Adaptation of the online help
- Test planning and execution
- Setup and packaging of the application
- User training and support
- Administration of networks and operating systems
Test Developer (Mainframe)
Bank
- Maintenance and implementation of COBOL and NATURAL applications in the loan syndication project
- Module tests with XPEDITOR and FILE-AID
- Organization and monitoring of integration tests according to the V-model
- Creation of audit-compliant test documentation
- Coordination with business departments on payment processes, forfaiting, netting, and much more
Fullstack Developer
Association
- Extension of reporting and user management
- Integration of additional queries and stored procedures
- Automated update checks
- Extension of online help
- Test planning and execution
- Application setup and packaging
- Network and system administration
Fullstack Developer
Association
- Extension of reporting and data structures
- Modification of queries and stored procedures
- Code optimization for performance
- Extension of online help
- Test planning and execution
- Application setup and packaging
- Network and system administration
Test Developer (Mainframe)
Telecommunication
- Quality assurance of all aspects of a software component
- Code and documentation reviews
- Creation of test plans and test concepts
- Setup of an automated test bed
Fullstack Developer
Association
- Redesign of the application (3-tier)
- High-level and detailed design, requirements specification
- Design of data structures, queries, and stored procedures
- Test phase planning and production rollout
- Module, functional, and integration testing
- Data migration from ISAM/VSAM to Access/SQL Server
- User management, reporting, data import/export (XML, Excel)
- Application packaging and system administration
Backend Developer (Mainframe)
Media Service Provider
- Design and development of interfaces for automated payment data exchange with financial institutions
- Report development
- Project management directly with customers and financial institutions
Backend Developer (Mainframe)
Bank
- Design and implementation of applications for creating customer and institution pricing models with history
- Consideration of standard/special models, commissions, fees, and tiered pricing
Backend Developer (Mainframe)
Wholesale
- Technical analysis of applications, programs, and databases
- Implementation of adjustments for the year 2000
Backend Developer (Mainframe)
Wholesale
- Extension of reporting functionality and existing interfaces
Fullstack Developer
Service Provider
- Development of the Universal Converter project for flexible conversion and routing of data
- Development of a custom scripting language and parser
- Implementation of interfaces to existing systems
- Client/server architecture with history tracking and restart capabilities
- Creation of custom reports
Project Manager
Wholesale
- Management of a project for automated complaint processing using data transmission techniques
- Centralized databases and automated error/plausibility checks
- Implemented decision logic and documentation of all processes
- Interfaces to SAP and the merchandise information system
- Creation of reports and user configurations
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Transportation, Retail, Banking and Finance, Media and Entertainment, and Energy.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, Quality Assurance, Customer Service, and Finance.
Summary
Senior Fullstack Developer specializing in Microsoft .NET, C# and Angular. IT experience since 1993, self-employed since 1997.
My focus is on established system landscapes: further development and modernization of existing applications, replacement of legacy systems and migration of monolithic architectures to service- or microservice-based structures – with Azure, Docker, Kubernetes and end-to-end CI/CD.
My current focus is Agentic Engineering: designing and implementing agent-based systems, from tool orchestration to integration with existing applications. This also includes integrating AI into existing .NET landscapes with connections to language models and retrieval from proprietary data, including in pure on-premises environments without cloud connectivity.
I work as a freelancer on a service contract basis, primarily remotely, in agile teams and as a technical architect.
Skills
Hardware**
Basic Knowledge Of Apple Mac, Unix Workstation
Professional Knowledge Of Personal Computers, Ipad, Ms Surface
Operating Systems / Data Communication**
Basic Knowledge Of Ibm Os/2 Warp, Unix/Linux
Professional Knowledge Of Ms Windows (All Versions Including Server), Windows Embedded Ce 5.0 & 6.0, Ms-Dos, Internet/Intranet, Windows Networks, Mqseries Server/Client
Networks**
Basic Knowledge Of Novell, Ibm Token-Ring
Professional Knowledge Of Windows, Tcp/Ip, Ipx, Netbeui, Ethernet
Programming Languages**
Basic Knowledge Of Python, Visual C++ .Net, Ms Visual C++ (6.0/Mfc), Vba Script, Pl/Sql, Unix Shellscript, Ms Powershell
Professional Knowledge Of Ms Visual C#, Ms Asp.Net, Typescript, Ms Visual Basic 6.0, Ms Visual Basic .Net, T-Sql, Javascript/Jquery, Html/Html5, Css/Scss (Sass)
Databases / Orm**
Basic Knowledge Of Oracle From Version 8, Mysql (From V3.X), Ibm Db2 V7/V8, Adabas C, Firebird, Postgresql
Professional Knowledge Of Ms Sql-Server (All Versions From 2000), Mongodb, Ms Entity Framework Since Version 4, Ms Entity Framework Core From Version 2.1, Ms Jet Engine (Access)
Software / Tools**
Basic Knowledge Of Ibm Visual Age For Smalltalk, Together J V3.01, Microtool Case 4/0, Corel Draw Suite
Professional Knowledge Of Ms Visual Studio 6 & 2002-2022, Visual Studio Code, Telerik Controls For Asp.Net/Winforms, Ms Team Foundation Server All Versions From 2010, Ms Devops, Git, Gitlab, Jira, Confluence, Visio From V5.0, Ms Office, Ms Visual Sourcesafe V6.0/2005, Ibm Visual Age For Cobol, Crystal Reports Vs 2003/2005/2008, Active Reports 2.0, Asg Rochade, Serena Versionsman And Changeman, Mercury Interactive Testdirector 8.0, Aris 6 Collaborative Suite, .Net Reflector, Jetbrains Resharper, Jetbrains Rider, Jetbrains Datagrip, Vmware Workstation, Docker Windows, Kubernetes
Frameworks / Technologies**
Microsoft .Net Framework Versions 1.1 To 4.8
Microsoft (Asp) .Net (Core) From Version 2
Ms Entity Framework From Version 4, Core From Version 2
Odp.Net (Oracle)
Angular From Version 4
Microsoft Asp.Net Mvc From Version 2
Microsoft Asp.Net Web Api 2
Microsoft Asp.Net Razor & Blazor
Jquery From Version 1.1.X
Asp.Net Signalr
Microsoft Extensible Framework
Swagger / Openapi
Microsoft Compact Framework Version 3-5
Ajax, Ms Silverlight 3+4
Mfc, Stl, Windows-Api (Sdk), Com/Com+, Activex
Rest, Wcf, Wpf, Tpl, (P)Linq
Software Quality Assurance – Testing**
Xunit, Ms Test, Nunit (Unit Test Frameworks)
Jasmine (Angular Test Framework)
Moq (Mocking Library)
Software Quality Assurance – Quality Analysis**
Sonarqube (Code Review Tool)
Collaboration Tools**
Azure Devops Server
Gitlab
Jira
Confluence
Cloud Platforms / Services**
Ms Azure Cloud: App Service, Virtual Machines, Azure Sql Database, Apim (Api Management Gateways), Aks (Azure Kubernetes Service), Acr (Azure Container Registry), Azure Keyvault, Azure Service Bus, Azure Rabbitmq Server, Azure Signalr, Azure Devops Server, Azure Repos & Pipelines
Elastic Cloud: Elasticsearch, Kibana
Virtualization**
Windows Docker
Vmware Workstation Pro
Application Security**
Auth0
Keycloak (Open Source)
Experience In**
Conception, Specification And Design
Redesign, Refactoring And Re-Engineering
Application And System Development
Quality Assurance, Quality Management
Profiling, Load And Performance Testing, Usability Testing
Microsoft Architectures
Microsoft Azure Cloud
Methods**
Object-Oriented Analysis, Design And Implementation (Ooa And Ood) According To Uml
Structured Analysis, Design And Implementation (Sa/Sd), Data Modeling (Erd)
Service-Oriented Architecture (Soa)
Test Methodology / Testing Procedures Of The V-Model
Agile Software Development (Scrum)
Standards**
Iso 9001:2000, Opc Da, Xml Da
Software Architecture Pattern**
Mvc, Mvvm, Mvp
Languages
Education
Düsseldorf Chamber of Crafts
AdA - Trainer Aptitude Examination · Vocational and Work Pedagogy · Germany
DAA Business School Düsseldorf
State-certified Business Economist, specializing in Business Informatics · Business Informatics · Germany
Vocational Training Center Essen
Data Processing Clerk · Organization and Data Technology · Germany
Certifications & licenses
Master Management with AI (MMAI®)
academy4ai
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Andreas is based in Erkrath, Germany and can operate in on-site, hybrid, and remote work models.
Andreas speaks the following languages: German (Native), English (Intermediate).
Andreas has at least 31 years of experience. During this time, Andreas has worked in at least 14 different roles and for 16 different companies. The average length of individual experience is 1 year. 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: Senior Fullstack .NET (Core) & Angular Developer, Senior Fullstack Developer .NET (Core) & Azure Developer Associate, Fullstack Developer .NET (Core) & Angular.
Andreas's most recent position is Senior Fullstack .NET (Core) & Angular Developer at IT Service Provider.
In recent years, Andreas has worked for IT Service Provider, Compliance Management, and Media.
Andreas is most experienced in industries like Information Technology, Banking and Finance, and Transportation. Andreas also has some experience in Retail, Media and Entertainment, and Energy.
Andreas is most experienced in business areas like Information Technology, Product Development, and Project Management. Andreas also has some experience in Quality Assurance, Customer Service, and Finance.
Andreas has recently worked in industries like Information Technology and Media and Entertainment.
Andreas has recently worked in business areas like Information Technology, Product Development, and Project Management.
Andreas attended Düsseldorf Chamber of Crafts for Vocational and Work Pedagogy.
Andreas has 1 certificate: Master Management with AI (MMAI®).
Andreas will be available full-time from January 2027.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
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 5 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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