10/14/2026 updated
100 % available
C#/.NET Developer | Business Automation, WPF & ASP.NET | VSTO/VBA Modernization & AI Integration
Pruszcz Gdanski, Poland
Only remote
Bachelor's Degree in Software Engineering, Minsky Instytut Kirowania (2008–2014)About me
C#/.NET developer based in Gdańsk, Poland, with 10+ years of experience turning manual workflows into business software. I build desktop and web applications, automate Microsoft Office, and modernize existing tools. I also publish iOS products and integrate AI into document workflows.
OpenAIASP.NET.NET FrameworkApplication Programming Interfaces (APIs)Amazon Web ServicesAutomationMicrosoft AzureC Sharp (Programming Language)Entity FrameworkWindows Presentation FoundationVisual Basic .NET (Programming Language)Office AutomationSQL DatabasesSystems IntegrationSQL Optimization
I help businesses replace manual workflows with practical C#/.NET applications and automation tools. With 10+ years of development experience, I work across desktop and web applications, Microsoft Office add-ins, data processing, and modernization of existing software.
HOW I CAN HELP
• Business applications: develop and extend C#/.NET solutions with WPF, ASP.NET, and Entity Framework Core.
• Microsoft Office automation: build Excel and Outlook add-ins with VSTO and VBA; automate Excel and Word document processing.
• Legacy modernization: migrate VBA solutions to C# and improve existing business tools.
• Data and performance: develop data-processing workflows, optimize SQL queries, and improve application performance.
• AI integration: connect the OpenAI API to business workflows, including using contextual data and model responses to populate document fields.
RELEVANT EXPERIENCE
VIT Software | C#/.NET/VBA Developer | 2018–present
Business applications, Office add-ins, VBA-to-C# migration, data processing, SQL optimization, and work with virtual machines and Azure/AWS infrastructure.
E-commerce automation | VBA/C# Developer | 2015–2018
Tools for data processing, parsing, and price-list generation; a CRM system for product availability and competitor-price monitoring.
PUBLISHED PRODUCTS
• KartGarage — kart-racing toolkit covering setups, parts inventory, maintenance, weather-based jetting, telemetry imports, and GPS lap/sector comparisons. kartgarage.net
• NapKit — baby sleep tracker with family sharing, Live Activities, Apple Watch support, and optional iCloud sync. napkit.net
• FeedKit — feeding log with Live Activities, Siri Shortcuts, Apple Watch support, and iCloud family sharing. feedkit.net
Hands-on experience publishing iOS apps and working with App Store Connect.
CORE TECHNOLOGIES
C#, .NET, .NET Framework, WPF, ASP.NET, SQL, EF Core, VBA, VSTO, Microsoft Excel, Outlook, Word, Git, Microsoft Azure, AWS, OpenAI API. I also use Claude, Codex, and Cursor for AI-assisted development.
Based in Gdańsk, Poland. Open to remote and hybrid projects. Tell me which workflow you want to automate or which application you need to build, extend, or modernize.
Experience
Professional experience10+ years
Freelancer since2015
Languages
EnglishGoodPolishGoodRussianNative speakerBelarusianNative speaker
Project history
January 2018–present | Remote
Developed business applications and automation solutions across the .NET and Microsoft Office ecosystems.
• Built WPF and ASP.NET applications using C#/.NET.
• Developed Excel and Outlook add-ins with VSTO and VBA; automated Excel and Word document processing.
• Migrated VBA solutions to C# to modernize existing business tools.
• Developed data-processing systems and optimized SQL queries and application performance.
• Worked with virtual machines and Azure/AWS infrastructure.
Technologies: C#, .NET, WPF, ASP.NET, VBA, VSTO, SQL, Azure, AWS.
Developed automation tools for e-commerce operations.
• Built VBA tools for data processing, parsing, and price-list generation to reduce manual work.
• Developed a CRM system for tracking product availability and monitoring competitor pricing.
• Combined online-store operations with the development of practical automation workflows.
Technologies: VBA, C#, Microsoft Excel, data processing.