You will get a Faster, Bug-Free .NET App — Debugging & Optimization
Project details
Is your .NET app crashing, throwing errors, or running slow? I find the real cause and fix it — fast. I debug and optimize ASP.NET Core, MVC, Web API, and .NET Framework apps, from urgent production bugs to deep performance problems.
I'm a senior .NET backend engineer (5+ years) who supports live production systems daily — bug triage, performance fixes, and incident response across property tech, ecommerce, and payments. You work directly with me, and I don't stop at the symptom — I fix the root cause so it doesn't come back.
What you can get:
✔ Root-cause analysis (not band-aids)
✔ Bug & crash fixes, exception handling
✔ Performance & SQL query optimization
✔ Clean, verified source code + a short report
Pick a tier: Quick Fix (one bug), Fix & Tune (multiple + performance), or Deep Overhaul (profiling & optimization).
Send me the error or a description of the issue — I'll tell you honestly if I can fix it and how.
I'm a senior .NET backend engineer (5+ years) who supports live production systems daily — bug triage, performance fixes, and incident response across property tech, ecommerce, and payments. You work directly with me, and I don't stop at the symptom — I fix the root cause so it doesn't come back.
What you can get:
✔ Root-cause analysis (not band-aids)
✔ Bug & crash fixes, exception handling
✔ Performance & SQL query optimization
✔ Clean, verified source code + a short report
Pick a tier: Quick Fix (one bug), Fix & Tune (multiple + performance), or Deep Overhaul (profiling & optimization).
Send me the error or a description of the issue — I'll tell you honestly if I can fix it and how.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$55
|
Standard
$185
|
Advanced
$485
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 7 days |
Number of Revisions | 1 | 3 | 7 |
Bug Investigation | |||
Fix Documentation | |||
Detailed Code Comments |
Optional add-ons
You can add these on the next page.
Additional Revision
+$30
Same-Day Delivery
+$50
Deploy the Fix
(+ 1 Day)
+$80
Root-Cause Report
(+ 1 Day)
+$50Frequently asked questions
About Md. Ashraful
Senior .NET Backend Developer | ASP.NET Core, APIs & AI Integration
Dhaka, Bangladesh - 10:36 am local time
Need an ASP.NET Core backend that holds up in production — not just in a demo? Across 5+ years and 8+ enterprise projects, I've built and operated .NET systems — APIs, integrations, and deployments — in property technology, ecommerce, payments, and field operations, owning them end to end.
That includes a property-valuation SaaS (Australian market) serving 600+ users and an ecommerce platform handling 7,000+ daily logins — running on infrastructure I deploy and maintain myself. I don't just write endpoints and hand them off. I design the REST API, model the SQL Server data, wire up the integrations, deploy to the server, and stay on for the production issues after launch. You work directly with me — the engineer actually writing your code — not a sales rep or a rotating team of juniors.
Lately I've been adding an AI layer on top of solid .NET foundations: LLM and RAG features, ChromaDB-backed retrieval so an app can answer from your own documents, and AI-assisted automation that cuts manual work. Real backend engineering plus practical AI, in one person — which is exactly where a lot of businesses are heading in 2026.
What I can help you with
✔ ASP.NET Core & C# backend development
✔ REST / Web API design & development
✔ SQL Server design & query optimization
✔ Third-party & payment integrations (accounting, maps, calendars, real-time/WebSockets)
✔ AI integration — LLM, RAG, OpenAI, vector databases (ChromaDB)
✔ Ubuntu/VPS deployment, CI/CD & GitHub Actions
✔ Production troubleshooting, bug fixing & performance optimization
✔ Legacy .NET maintenance & modernization
My tech stack
Backend: C#, ASP.NET Core, ASP.NET MVC (Razor), Web API, Entity Framework, ABP Framework, REST, WebSockets
Database: Microsoft SQL Server — schema design, query optimization, working with large existing databases
AI & automation: LLMs, RAG pipelines, OpenAI API, ChromaDB (vector DB), AI-assisted development
Integrations: Xero/accounting, payment gateways, Google Maps, Google Calendar, IBM Watson, offline sync
DevOps: Ubuntu/Linux, Git, GitHub Actions, Docker, Nginx reverse proxy, CI/CD
Also: PHP (Laravel, CodeIgniter), Node.js, JavaScript, jQuery, basic Angular
A bit of what I've built
A production property-valuation SaaS (Australian market) on ASP.NET Core + ABP, serving 600+ users — valuation workflows, real-time updates, and accounting/third-party integrations
An offline-first field-data capture system with an ASP.NET Web API backend that syncs reliably under poor connectivity
Dealsorts — a smart ecommerce platform handling 7,000+ daily logins, which I built and deploy myself
ParkSharee — a parking booking/reservation platform I built end to end, currently in final pre-launch hardening
An open-source npm package I published and maintain, used by other developers
3 live projects currently running on my own self-managed Linux server — I own the deployment, configuration, and uptime
I'm a strong fit if you…
Have an ASP.NET Core app that's slow, buggy, or breaking under load and needs a senior hand
Need a reliable REST API or third-party/payment integration built right the first time
Want to add AI — chat, RAG over your own data, or automation — to an existing .NET system
Need someone to deploy, configure, and actually keep your app running in production
Are a startup or founder who wants one engineer who can own the backend end to end
How I work
I ask the right questions before writing a line of code, agree on a clear scope and timeline, share progress regularly, and test before I hand anything over. If something's wrong, I tell you early. My goal is a system you can build on — not a quick fix that breaks in three months.
Why clients work with me
✅ Production-ready, clean, maintainable code
✅ Clear, regular communication — you won't have to chase me for updates
✅ Fast responses and honest timelines
✅ I find the real problem, not just the reported one
✅ Post-delivery support and reasonable revisions
✅ Focused on long-term business value, not just closing a ticket
Availability
Open to part-time and full-time contracts, hourly or fixed price. I keep flexible hours and can overlap with US, UK, EU, and Australian business times, and I usually respond within a few hours.
Free 30-minute consultation
Choosing the right developer matters. Before any commitment, I'm happy to spend 30 minutes understanding your requirements, reviewing your existing system, and suggesting the best approach.
Send me a message or invite with a short description of your project, and I'll reply with a clear plan and an honest recommendation.
Steps for completing your project
After purchasing the project, send requirements so Md. Ashraful can start the project.
Delivery time starts when Md. Ashraful receives requirements from you.
Md. Ashraful works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce & Diagnose
I reproduce the issue, review logs and code, and confirm exactly what's going wrong.
Root-Cause Analysis
I trace the problem to its real source, not just the visible symptom.