09/10/2026 updated
100 % available
Senior .NET / C# Developer & Software Architect | Azure, Angular, SQL, Integrations
Warszaw, Poland
Only remote
About me
Senior .NET/C# engineer and solution architect with 20+ years of experience in enterprise software, Azure integrations, APIs and full-stack applications. Hands-on developer with strengths in modernization, architecture and technical leadership. Based in Poland, available for remote EU B2B projects.
ASP.NETMicrosoft AzureC Sharp (Programming Language)Data IntegrationAzure SQLSoftware ArchitectureSoftware SystemsSolution ArchitectureSystems IntegrationWeb Application DevelopmentAzure Service Bus.NET CoreAzure Data FactoryApi DesignASP.NET Applications
Senior .NET/C# Software Engineer and Solution Architect with 20+ years of experience designing, developing and modernizing enterprise software systems.
Core expertise:
- C#, .NET, .NET Core, ASP.NET, ASP.NET Core, Web API and REST/OData services
- Enterprise application architecture, layered architecture, clean code, refactoring and legacy modernization
- SQL Server, T-SQL, relational databases, complex queries, stored procedures, data modelling and performance optimization
- Microsoft Azure, Azure Functions, Azure Data Factory, Azure SQL, Azure Service Bus, Azure Blob Storage, Microsoft Entra ID/Azure AD and Application Insights
- API design, authentication, authorization, error handling, logging, monitoring and reliable external-system integrations
- Data integration, ETL, data migration, data synchronization and business process automation
- Angular, TypeScript, JavaScript, HTML and CSS for full-stack web application development
- Integration with enterprise systems, databases, APIs, SOAP/Web Services and file-based data exchange
- Automated and manual testing, unit and integration testing, troubleshooting, production support and technical documentation
- Technical leadership, solution design, code reviews, mentoring, stakeholder communication and collaboration with distributed teams
I have practical experience delivering complex solutions in financial, insurance, tax, public-sector and other enterprise domains. Examples include modernizing ASP.NET applications to ASP.NET Core, designing Azure-based integration services, implementing Azure Functions and Data Factory pipelines, integrating external systems and supporting bidirectional data synchronization through Azure Service Bus.
I am comfortable working with both new development and large legacy codebases. I focus on maintainability, reliability, security, clear communication and delivering measurable business value.
English: B2. Ukrainian: Native. Based in Poland and available for remote EU B2B cooperation.
Experience
Professional experience10+ years
Freelancer since2026
Languages
EnglishGoodRussianNative speakerUkrainianNative speaker
Project history
Entwicklung und Wartung von .NET- und ASP.NET-Core-Anwendungen, REST-/OData-APIs und Enterprise-Integrationen. Arbeit mit Azure Service Bus, Azure Blob Storage, Azure AD, Application Insights und SQL Server. Umsetzung von Modernisierungen, automatisierten Tests und Integrationstests. Fehleranalyse, Produktionssupport, Code Reviews und technische Dokumentation.
Konzeption und Umsetzung von Enterprise-Integrationslösungen mit C#, .NET, Azure Functions, Azure Data Factory, Azure Service Bus und SQL Server. Entwicklung von API- und Datenbankintegrationen, Datenmigrationen sowie bidirektionaler Datensynchronisation. Implementierung von Fehlerbehandlung, Retries, Logging und Monitoring. Technische Lösungsarchitektur, Tests, Produktionssupport und Abstimmung mit Stakeholdern.
Entwicklung und Modernisierung von .NET-Anwendungen und Datenplattformen mit ASP.NET, ASP.NET Core, Angular, SQL Server, Azure SQL und Azure Service Bus. Beförderung zum Technical Lead im Oktober 2022 mit Verantwortung für ein Team von drei Entwicklern, Architekturentscheidungen, Code Reviews und Mentoring. Entwicklung von Datenmodellen, T-SQL-Programmierung und Performanceoptimierung. Einrichtung von Git- und Azure-DevOps-CI/CD-Pipelines.