Hire a Freelance AI & .NET Developer
I'm a freelance AI & .NET Technical Lead with 8+ years of experience. I work with startups and growing businesses to add AI to their products and build Blazor web apps, WPF desktop tools, and production-grade APIs — on time, within budget, and with clean code you can maintain.
Quoted Against Your Scope — No Surprises
Every project is different, so I quote against the actual brief rather than a menu. Want a number before you talk to anyone? Run your brief through the free cost estimator for an instant ballpark, no sign-up needed. All quotes are issued in USD unless agreed otherwise.
What Drives the Number
(where your project sits)Best for: Ongoing retainers, maintenance, bug fixes, feature additions on existing codebases
- Blazor / ASP.NET Core maintenance
- WPF updates & enhancements
- API additions & fixes
- Code review & refactoring
Best for: New modules, API integrations, Blazor web apps, WPF desktop tools, MVP builds
- New Blazor web applications
- WPF desktop development
- Third-party API integrations
- Full-stack module builds
Best for: AI integrations, architecture design, legacy migrations, technical leadership, urgent timelines
- AI / Semantic Kernel integration
- .NET legacy migration
- System architecture design
- Fractional Tech Lead / CTO
Project Engagement Models
(how the work is structured)Short Sprint
Time & materials, or a fixed quote if the scope is tight.
Best for: Bug fixes, feature additions, API integrations, small builds
Fixed-Price Project
One agreed total, quoted from the spec. No hourly surprises.
Best for: MVP builds, module rewrites, Blazor migrations, API projects
Monthly Retainer
Fixed monthly fee for an agreed block of capacity.
Best for: Continued development, new features, tech lead support
Always Included
- Weekly progress demos (working software, not slides)
- Full source code ownership — you keep everything on final payment
- Git repository with clean, documented commit history
- 30-day post-launch support for bugs & questions
- NDA signing on request
- Invoice in USD, GBP, or AED
Not Included
- Third-party API costs (Supabase, Azure, AWS, etc.)
- UI/UX design (I can recommend trusted designers)
- Ongoing hosting / infrastructure management
- Scope additions after the agreed spec — quoted separately
Payment Terms
Fixed Projects
50% upfront, 50% on final delivery. Milestone payments available on larger projects.
Retainers
Invoiced monthly in advance. Cancel anytime with 14 days notice.
Payment Methods
Bank transfer (SWIFT/SEPA), PayPal, Wise, or Razorpay (India).
Currencies
USD (preferred), GBP, AED, EUR, or INR. Invoices issued in your preferred currency.
Notes by Region
Senior-level .NET expertise at a meaningful discount to what an equivalent local hire costs. Ask for a quote and compare it against your last one.
Experienced working in Gulf timezone (IST +1.5–2.5 hrs from UAE/Saudi). NDA and Arabic invoice available on request.
All quotes issued in USD. Timezone overlap of at least 4 hours maintained for any client timezone.
What I Build
Blazor Web Applications
Full-stack Blazor Server or WASM applications — from SaaS platforms to internal business tools. Clean architecture, real-time UI, and solid API design.
WPF Desktop Software
High-performance Windows desktop applications with rich XAML UIs, real-time data grids, charting, and business logic — built for demanding industries like fintech and healthcare.
API Development & Integration
RESTful APIs, background job pipelines with Hangfire, OAuth 2.0 integrations, and third-party platform connections (Zoom, Clio, Lawmatics, payment gateways).
Legacy .NET Migration
Modernise your old WinForms, .NET Framework 4.x, or WebForms app to .NET 10 (LTS) with Blazor or ASP.NET Core — without breaking what already works.
Architecture & Technical Lead
Need a senior hand to define your system architecture, review code, set up CI/CD, or guide your dev team? I can step in as a fractional technical lead.
End-to-End MVP Build
Got an idea? I'll help you scope, plan sprints, and ship a working MVP fast — handling everything from database design to deployment on Azure or Vercel.
What You Get
Fast Onboarding
I start contributing on day one — no lengthy ramp-up or hand-holding required.
Outcome-Focused
I measure success by what ships and what it saves you — not hours logged.
Remote-Ready
Async-first, timezone-flexible, and experienced working with distributed teams.
No Lock-in
Clean, documented handover at the end of every engagement. You always own your code.
Weekly Demos
You see working software every sprint — no black boxes or month-long silences.
Full-Stack Depth
From database schema to UI — I handle the whole vertical, not just one layer.
How We Work Together
Discovery Call
Free 30-minute call to understand your project, goals, constraints, and timeline.
Proposal & Quote
Detailed scope document with deliverables, milestones, timeline, and fixed or hourly pricing.
Sprint Delivery
Weekly sprints with demos. You see working software every week — no black-box development.
Handover & Support
Clean code handover with docs, deployment, and 30-day post-launch support included.
Connect Your AI
Planning a .NET migration? Point your assistant at my Legacy Code X-ray and get a modernization report on your own code before we ever talk.
Your AI assistant can call my site directly
This portfolio runs an MCP server, the open protocol Claude, Cursor and VS Code use to plug in tools. Connect it once and your assistant can run the Legacy Code X-ray on files straight from your repository. No copying code into a website.
Then just ask
“X-ray Orders.aspx.cs for a .NET 10 migration”
Code is never stored or logged. It's analysed by Google Gemini, with likely secrets redacted before it leaves the server. No account or API key needed.
Endpoint
https://kathanpatel.vercel.app/mcpRun once in your terminal
claude mcp add --transport http legacy-xray https://kathanpatel.vercel.app/mcp
Common Questions
How much does it cost to hire a freelance .NET developer?
It depends on scope, complexity, and how well-defined the spec is — a maintenance retainer and a multi-module MVP are not comparable numbers, and any developer quoting you before seeing the brief is guessing. Two ways to get a real figure: run your brief through the free AI cost estimator on this site for an instant ballpark, or book a free 30-minute discovery call and I'll quote a fixed price against the actual scope.
Do you work on existing codebases or only new projects?
Both. A large share of my work is on existing Blazor, ASP.NET Core, and WPF codebases — bug fixes, new modules, refactoring, and legacy .NET Framework migrations. You don't need a greenfield project to hire me.
How do payments work?
Fixed-price projects are 50% upfront and 50% on final delivery, with milestone payments available on larger projects. Retainers are invoiced monthly in advance. I accept bank transfer (SWIFT/SEPA), PayPal, and Wise, in USD, GBP, AED, EUR, or INR.
Who owns the code?
You do. Full source code ownership transfers to you on final payment, including the Git repository with a clean, documented commit history. There is no lock-in — every engagement ends with a complete handover.
Do you sign NDAs?
Yes, I sign NDAs on request before any project details are shared. Confidentiality is standard practice for my client work.
What timezone overlap can I expect?
I'm based in India (IST) and maintain at least 4 hours of working overlap with any client timezone — US, UK, Europe, Gulf, or Australia. I work async-first, so progress doesn't depend on meetings.
What does a project include?
Every engagement includes weekly progress demos with working software, a documented Git repository, 30-day post-launch support for bugs and questions, and full code ownership. Third-party service costs (hosting, APIs) and UI/UX design are quoted separately.
How do we get started?
Send a short message describing your project by email or through the contact form. I respond within 24 hours and set up a free 30-minute discovery call — no obligation. For a rough budget first, try the free AI cost estimator on this site.
Ready to Start?
Send me a quick message with your project idea. I respond within 24 hours and will set up a free 30-minute discovery call — no obligation.
patel.kathan555@gmail.com · (+91) 7600410895 · Ahmedabad, India (Remote 🌍)