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Mussab User

@mussabuser

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Backend .NET developer at Upwork building C# APIs and services, including an audio-recording feature for a WPF app.

Pakistan

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What I'm looking for

I'm available for remote work and open to a 9 PM–6 AM PKT shift.

At Upwork, I take C#/.NET projects from requirements through deployment for overseas clients. I also added audio recording to a WPF emotion-detection app, using FFmpeg to capture and encode audio.

At Xsicon, I built the ASP.NET Core Web API backend for a direct-to-consumer e-commerce platform, using Supabase (PostgreSQL) as the data layer. I designed the catalog, cart, checkout, and order schema and REST endpoints.

At CareCloud, I built and maintained REST APIs for a healthcare microservices platform and worked on its Angular front end. I tuned SQL queries and caching to reduce average API response time from 450ms to around 200ms.

At Multiways Technologies, I built ASP.NET Core APIs for client web and mobile apps and automated release workflows, reducing deployments from two hours of manual work to about 15 minutes. I also built a .NET 8 audio pipeline that uploads recordings in chunks, transcribes them in parallel, and serves playback over HLS.

Experience

Work history, roles, and key accomplishments

Current

Freelance Software Engineer

Current

Upwork

Jan 2023 - Present (3 years 9 months)

Took C#/.NET projects from requirements to deployment for overseas clients, achieving a 100% Job Success Score. Added audio recording to a WPF emotion-detection app using FFmpeg.

C#.NET WPF FFMPEG OpenCV

Software Engineer (Contract)

Xsicon

Feb 2026 - Jun 2026 (4 months)

Built the ASP.NET Core Web API backend for a direct-to-consumer e-commerce platform with Supabase (PostgreSQL) and a Blazor Server front end. Designed schema and REST endpoints for catalog, cart, checkout, and orders.

ASP.NET Core Supabase PostgreSQL Blazor REST APIs Schema Design

Software Engineer

CareCloud

Mar 2024 - Oct 2025 (1 year 7 months)

Built and maintained REST APIs on a healthcare microservices platform in ASP.NET Core, and worked on the Angular front end. Tuned T-SQL stored procedures, cut API response times, and built third-party integrations.

C#ASP.NET Core .NET 6 .NET 8+Angular TypeScript RxJS SQL Server T SQL Entity Framework Core xUnit Moq Azure DevOps Application Insights

Full-Stack Engineer

Multiways Technologies

Jan 2023 - Feb 2024 (1 year 1 month)

Built REST APIs in ASP.NET Core for client web and mobile apps with ASP.NET Identity and JWT auth. Automated releases on GitHub Actions and Azure DevOps, reducing deployment time from 2 hours to 15 minutes.