Need a backend, full-stack, or AI system that holds up in production, not just on a demo branch? That's what I do. I'm a senior software engineer with 6+ years building web apps, desktop products, data platforms, and enterprise integrations for clients in the US, Canada, and Europe.
Clients usually come to me with one of these problems:
- "Our API is slow or falls over under load." I profile it, fix the queries and caching, and add retries, idempotency, and monitoring so failures stop reaching your users.
- "We need a real product, not a prototype." Secure auth, roles and permissions, billing, background jobs, licensing, automated tests, and CI/CD are part of the build, not a phase two.
- "We want AI over our own documents but it keeps answering wrong." I build RAG pipelines with hybrid search, reranking, and measured retrieval quality so answers are traceable.
- "Our legacy mainframe code needs to run somewhere modern." I deploy and repair COBOL/CICS/DB2/JCL systems on z/OS and IBM Cloud.
WHAT I WORK WITH
Backend: .NET Core, Python, FastAPI, Node.js, REST APIs, Clean Architecture, CQRS, Kafka, MassTransit, SignalR, Hangfire
Frontend: Angular, React, Next.js, TypeScript, RxJS, NgRx, Tailwind, Material UI
Data: PostgreSQL, SQL Server, MongoDB, Redis, Qdrant, pgvector
AI: RAG, LangChain, OpenAI, Cohere, hybrid vector + BM25 search, reranking, evaluation
Cloud and DevOps: AWS, Azure, IBM Cloud, Docker, GitHub Actions, Azure DevOps, xUnit, pytest
Mainframe: z/OS, COBOL, CICS, DB2, VSAM, JCL
WHAT I'VE DELIVERED
- A multi-tenant vendor risk platform covering supplier onboarding through audits and remediation, with enterprise SSO, granular permissions, Stripe billing, and AWS deployment.
- Three years on a freight-forwarding ERP: 1,000+ endpoints, 25+ carrier and accounting integrations, and the full rate-to-shipment lifecycle.
- A licensed Windows and macOS desktop product with signed entitlements, offline grace periods, and crash-recovery testing.
- A multilingual vehicle-manual chatbot with intent classification and an automated retrieval-evaluation harness.
- Technical leadership of a 6-developer team across architecture, estimation, and releases.
HOW I WORK
I plan carefully before writing code, clarify anything that is unclear, and provide an honest estimate before development begins. I will also tell you early if an approach is risky or unlikely to work. You will receive working increments that you can review throughout the project - not a month of silence followed by unexpected results. I always take ownership of project and meet the deadline I commit to. I have maintained a 100% Job Success Score and delivered more than 2,400 hours of work on Upwork.
Some of my project details are in my portfolio and work history below.
Send me your requirements, and I will reply with a clear technical approach, the main trade-offs, and a realistic delivery timeline.
A.S.M. Mahabub R.
.NET | .NET Core | MVC | SQL | jQuery| REACT
Dhaka, Bangladesh
$15/hr$15 per hour5.0 (3) 5 jobs $40K+ total earnings
Greetings!
If you want to create a website or make changes in an existing ASP.NET MVC website, then you are in the right place. I'm expert and well trained ASP.NET MVC developer and can help you.
I can build virtually anything you may need. My 8-year web development experience includes a wide range of different solutions: from one-page websites to complex data-oriented applications.
My main working technologies and frameworks: ASP.NET MVC, C#, JQuery, Bootstrap, AngularJS, Entity Framework, MS SQL Server.
Key principles of my work:
๐น Communication. I know how important it is, and I am always in touch with you.
๐น Insight. I consider your project as my own and try to improve it, make suggestions and enhancements.
๐น Quality. A key to the success of your project and my main area of expertise. I make ONLY high-quality websites and web application.
Also, I have a good background of Windows software development (using C#, .NET, WinForms), so please feel free to send me a word if you need one.
The following are some of the services with which I can help you:
Here are my skill:
๐น .NET & .NET MVC
๐น .NET CORE
๐น ASP.NET
๐น CRYSTAL REPORT
๐น RDLC
๐น SQL SERVER
๐น MY SQL
๐น REACT
๐น JQUERY
๐น JAVASCRIPT
๐น ANGULAR
Why Me?
๐น Can work with USA, Canadian and Australian local official time.
๐น Available on skype, email and phone.
๐น Well-organized and efficient.
๐น Strong background in all phases of network and support.
๐น Self-motivated and assertive.
๐น Quickly learn procedures and methods.
๐น Enjoy working with people.
๐น Efficient and courteous.
๐น Able to work with others toward a team goal.
I am waiting for you to complete your project successfully. :)
Aminul H.
Senior Full-Stack .NET Developer| ASP.NET Core | Blazor | React | AI
Dhaka, Bangladesh
$20/hr$20 per hour4.8 (33) 49 jobs $20K+ total earnings
I'm a Senior Full-Stack .NET Developer with 14+ years of experience delivering enterprise web applications, SaaS platforms, and scalable business solutions for clients across the USA, Europe, Canada, and Australia.
I specialize in building secure, high-performance applications using ASP.NET Core, C#, Blazor, React, Next.js, Web API, SQL Server, PostgreSQL, Azure, and Umbraco CMS. I also have extensive experience integrating Stripe, Authorize.Net, third-party APIs, and AI-powered solutions.
##Core Expertise:
* ASP.NET Core, C#, Web API, REST APIs, Entity Framework Core, LINQ,Dapper
* Blazor, React.js, Next.js, JavaScript, TypeScript, JavaScript, HTML5, CSS3, Bootstrap
* Umbraco CMS & DotNetNuke(DNN)
* SQL Server, PostgreSQL
* Microsoft Azure,Azure App Service,Azure SQL Database,Azure Communication Services
* Stripe, Authorize.Net
* Google APIs, Facebook APIs, Email & SMS Services,Third-party REST APIs
* AI-assisted application development
* GitHub, Azure DevOps
## What I can help you build
โ Enterprise Web Applications
โ SaaS Platforms (Multi-Tenant)
โ ERP & CRM Systems
โ Inventory & Order Management
โ Property Management Systems
โ Healthcare & Education Platforms
โ Financial & Accounting Solutions
โ REST APIs & Third-Party Integrations
โ AI-powered Business Applications
โ Legacy .NET Modernization
โ Cloud-ready Solutions on Microsoft Azure
I focus on delivering clean architecture, scalable solutions, and high-quality code that helps businesses grow. Whether you need a new SaaS platform, enterprise application, API integration, or modernization of an existing system, I'm ready to help.
If you're looking for a senior developer who understands both technology and business, I'd be happy to discuss your project and help turn your ideas into reliable, scalable software.
Sarajus S.
Full Stack .NET Developer, C#, ASP.NET, SQL Server, AI-Assisted
Dhaka, Bangladesh
$20/hr$20 per hour5.0 (2) 11 jobs $10K+ total earnings
โ 100% Job Success | 5.0 Rating | 2,100+ Hours on Upwork
โ Full Stack Developer since 2014, C# and .NET focused
โ Based in Dhaka, Bangladesh, working with clients worldwide
I help businesses turn designs and requirements into clean, production-ready web applications โ from responsive front-end interfaces to backend APIs, database design, and deployment, using modern AI-assisted development workflows to deliver faster without sacrificing code quality.
CORE EXPERTISE
Backend: C#, ASP.NET, ASP.NET Core, SQL Server, REST APIs
Frontend: HTML/CSS/JS, SASS, Bootstrap, jQuery, React.js, Knockout.js, Gatsby
Design-to-Code: Pixel-perfect conversion from Figma, Adobe XD, PSD, Zeplin, or PowerPoint
WordPress: Custom theme development, theme customization, PSD-to-WordPress
Additional Backend: Java (Spring, Spring Boot, Hibernate), Node.js, Express
Databases: MySQL, SQL Server, MongoDB, NoSQL
Mobile: React Native, NativeScript
Build Tools: Webpack, npm, Maven, Gradle, Ant
WHY WORK WITH ME
Full-stack ownership, from database and backend logic to responsive front-end delivery
Clean, maintainable, hand-written code, no bloated templates
Cross-browser compatible, SEO-friendly, W3C-valid builds
AI-assisted workflow to accelerate delivery while maintaining clean code
Clear communication and reliable deadlines
Have a project in mind? Message me and let's talk about how I can help you ship it.
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