Sachin Kumar, Developer in Noida, Uttar Pradesh, India
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Sachin Kumar

Software Developer

Noida, Uttar Pradesh, India

Toptal member since January 20, 2026

Bio

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

Highlands Infotech Pvt Ltd
C#.NET, Windows Presentation Foundation (WPF), Telerik WPF...
BE Software Solutions Pvt Ltd
C#.NET, Windows Presentation Foundation (WPF), XAML, Interactive UI, C#

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

2016 - PRESENT
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.
Technologies: C#.NET, Windows Presentation Foundation (WPF), Telerik WPF, Model View ViewModel (MVVM), Prism, OxyPlot, DocuSign, Buffer, Data Modeling, GIS, Geospatial Data, KML, Models, .NET, C#, Avalonia, AvaloniaEdit

Software Engineer

2013 - 2016
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.
Technologies: C#.NET, Windows Presentation Foundation (WPF), XAML, Interactive UI, C#

Experience

GeoSTORM (Civil Engineering Stormwater Modeling)

https://www.civilgeo.com/geostorm/
GeoSTORM is a Windows desktop engineering application used for stormwater drainage design and hydrology workflows. I worked as a WPF/.NET engineer on the core UI and architecture, implementing MVVM patterns and reusable components to support complex engineering scenarios. I focused on performance and responsiveness by applying async/multithreading patterns for heavy calculations and long-running workflows. I also contributed to improving stability through debugging and refactoring, and built rich visualization components for engineering outputs using charting and plotting techniques.

GeoHECRAS (HEC-RAS Modeling & Hydraulic Analysis)

https://www.civilgeo.com/geohecras/
GeoHECRAS is a Windows desktop product built for hydraulic modeling and engineering analysis workflows. I contributed to developing and maintaining WPF UI modules using MVVM and Prism, building reusable controls and improving user productivity through a consistent and scalable interface design. I implemented multi-threaded and asynchronous execution to ensure UI responsiveness for computation-heavy operations. I also supported production stability by identifying and fixing complex runtime issues, improving exception handling, and optimizing performance in key workflows.

GeoHECHMS (Hydrology Modeling & Analysis)

https://www.civilgeo.com/geohechms/
GeoHECHMS is an engineering desktop application used for hydrology modeling and watershed analysis. I worked on WPF/.NET development with MVVM and Prism to deliver modular features and reusable UI frameworks. I focused on performance optimization and stability improvements by applying async patterns and multithreading to reduce UI freezes during long-running operations. I also contributed to charting and data visualization panels to help users interpret modeling results effectively and supported ongoing maintenance through debugging and fixes.

Internal Sales & Support Workflow Tool (DocuSign Integration)

I worked on an internal enterprise application used by sales and support teams to manage customer workflows and improve operational efficiency. I implemented DocuSign integration to automate document signing and approval processes, including secure authentication, status tracking, and error handling. I ensured reliable API communication and built stable workflows to minimize manual steps and speed up turnaround time. I also improved maintainability by following clean architecture practices, writing reusable components, and supporting debugging and production fixes.

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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