
Sachin Kumar
Verified Expert in Engineering
Software Developer
Noida, Uttar Pradesh, India
Toptal member since January 20, 2026
Sachin is a senior .NET/C# developer specializing in Windows and WPF (MVVM), building high-performance applications with a strong focus on multithreading, stability, and clean architecture. He has delivered integrations with DocuSign and third-party marketplaces, and is trusted for debugging complex issues and shipping reliable production code.
Portfolio
Experience
- Model View ViewModel (MVVM) - 10 years
- XAML - 10 years
- C#.NET - 10 years
- Windows Presentation Foundation (WPF) - 10 years
- Telerik WPF - 7 years
- OxyPlot - 7 years
- Prism - 6 years
- SQL - 5 years
Preferred Environment
Windows, Visual Studio, Git, Azure DevOps, SQL, SQL Server Management Studio (SSMS), Telerik WPF, ReSharper, Postman, C#.NET
The most amazing...
...thing I've built and optimized WPF/.NET apps with multithreading and delivered DocuSign + marketplace integrations for production systems.
Work Experience
Principal Engineer – WPF
Highlands Infotech Pvt Ltd
- Developed and maintained WPF desktop applications for CivilGEO engineering products.
- Built MVVM-based architecture using Prism with reusable modules and custom controls.
- Implemented multithreading and async patterns to keep heavy engineering workflows responsive.
- Developed OxyPlot-based charts and visualization panels for engineering analysis and reporting.
- Integrated DocuSign APIs into internal tools to automate document signing workflows.
- Created reusable UI components and frameworks to improve consistency across multiple products.
- Collaborated with cross-functional teams to deliver reliable releases and production fixes.
Software Engineer
BE Software Solutions Pvt Ltd
- Built interactive WPF applications, including iKoncierge and iShowroom, for client use.
- Implemented multi-touch and gesture-based UI experiences for large-screen environments.
- Optimized WPF UI performance and ensured smooth user experience across releases.
Experience
GeoSTORM (Civil Engineering Stormwater Modeling)
https://www.civilgeo.com/geostorm/GeoHECRAS (HEC-RAS Modeling & Hydraulic Analysis)
https://www.civilgeo.com/geohecras/GeoHECHMS (Hydrology Modeling & Analysis)
https://www.civilgeo.com/geohechms/Internal Sales & Support Workflow Tool (DocuSign Integration)
Skills
Libraries/APIs
OxyPlot, Buffer
Tools
AvaloniaEdit, Visual Studio, Git, GitHub, ReSharper, Postman, Prism, GIS
Languages
C#.NET, XAML, C#, SQL, KML
Frameworks
Windows Presentation Foundation (WPF), .NET, Avalonia, ASP.NET
Paradigms
Model View ViewModel (MVVM), Azure DevOps
Platforms
Telerik WPF, Windows
Storage
SQL Server Management Studio (SSMS)
Other
Contract, Contract Drafting, Contract Lifecycle Management (CLM), Spreadsheet Automation, DocuSign, Interactive UI, Data Modeling, Geospatial Data, Models, APIs
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