YRYasir.dev
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Available for select projects — 2026

Senior .NET & React
engineer for systems
that actually scale.

I'm Yasir Rehman — I build enterprise web apps, ERP/CRM platforms, AI integrations and automation systems with ASP.NET Core, React & SQL Server. 5+ years · 60+ projects delivered · Top Rated on Upwork & Fiverr, building AI-powered software for businesses worldwide.

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YasirRehman.cs.NET & C#
public class Engineer {
public string Name => "Yasir Rehman";
public string[] Stack => [
"ASP.NET Core", "C#", "React",
"SQL Server", "Azure", "OpenAI"
];
public int Projects => 60;
public double Rating => 5.0;
// ships production systems, not demos
public Result Build(Idea idea) =>
idea.ToScalableSystem();
}
Build passing~ 5+ yrs uptime
Trusted onUpworkFiverr
IndustriesHospitalityReal EstateLogisticsFinTech
Tech stack
C#
ASP.NET Core
Next.js
React
TypeScript
JavaScript
SQL Server
Azure
Docker
Redis
Git
Angular
Firebase
AWS
OpenAI
Entity Framework
Blazor
Stripe
SignalR
Web API
How I turn your idea into a shipped product
01Discover

Deep-dive into your goals, users & constraints

02Architect

Right stack, clean design, defined scope & milestones

03Build

Agile sprints, regular demos, clean documented code

04Ship & Support

CI/CD deploy, monitoring, handover & ongoing care

AI Systems — Always On

I build AI-powered systems that run your business while you sleep.

From chatbots to full CRM/ERP platforms — AI woven into systems built for real businesses, not demos.

Explore AI & AutomationStart an AI project
OpenAI APIClaudeAzure OpenAIn8nWhatsApp Cloud API
ai-agent · yasirrehman.dev Online
Autonomous · 24/7No-code handover
Where it shows up in your business

AI Chatbots & Virtual Agents

24/7 agents that qualify leads, answer customer questions and book calls — on your website or WhatsApp.

AI-Powered Mobile Apps

Cross-platform apps with smart search, recommendations and in-app assistants built in from day one.

Smart Business Websites & Tools

SEO-ready sites and internal tools that automate reporting, admin work and daily busywork.

CRM & ERP for FinTech and Real Estate

Lead pipelines, billing and property/lending dashboards tailored to how your business actually runs.

Hospitality & Manufacturing Systems

Booking, inventory and production tracking for hotels, factories and foam/industrial manufacturers.

Workflow & Business Automation

Autonomous pipelines that replace manual spreadsheets, approvals and repetitive data entry.

Workflow Automation

Your busywork, turned into a workflow

A typical lead-automation flow I build with n8n, webhooks and AI — every step runs on its own.

Trigger

New lead arrives

WhatsApp, Facebook, TikTok or your website form

AI

Qualify & reply

AI answers instantly and asks the right questions

Action

Update your CRM

Lead created, scored and assigned to the right person

Notify

Alert your team

Hot leads pushed to WhatsApp or email in real time

Schedule

Follow up automatically

Reminders go out until the lead replies — no one forgets

n8nZapierMakeWebhooksOpenAI APIWhatsApp Cloud API

Real example: PropFlow CRM automates WhatsApp lead capture, replies & follow-ups →

Selected Work

Systems shipped for real businesses

Case Study

POS, Sales, Purchase & Ledger Management System

POS, sales, purchase, and ledger management for small and medium businesses — plus stock, accounts, and team access, all in one dashboard.

All-in-one: POSpurchases & ledger
Read the full breakdown
POS, Sales, Purchase & Ledger Management Systemdashboard · before / after
Services

Engineering across the full stack

From idea to production — backend, frontend, mobile, AI and the business systems that tie it all together.

Backend Architecture

Clean, scalable .NET systems built on solid boundaries — APIs, services and domain logic that hold up under growth.

.NET 8ASP.NET CoreClean Architecture

ERP / CRM Platforms

Custom business systems for logistics, real estate and warehousing — dispatch, inventory, billing and dashboards.

SQL ServerSignalRReporting

Mobile Apps

Cross-platform mobile apps that pair with your backend for field teams, drivers and customer-facing workflows.

React NativeRealtimePush

AI Integrations

Production-grade AI features — chat, drafting, summarisation and automation wired safely into existing systems.

OpenAI APIPrompt DesignAutomation

Payments & Billing

Subscription billing, invoicing and payment flows integrated cleanly with your product and customer records.

StripeInvoicingWebhooks

Data & Cloud

Database design, migrations and cloud deployment so your data stays fast, consistent and easy to scale.

SQL ServerAzureDocker
Explore all services
Writing & Video

Technical content for builders

Deep-dives on .NET, architecture and AI — plus walkthroughs on YouTube.

All articles
Tech Stack

Tools I work with every day

A battle-tested stack built for enterprise-grade software.

Core / Backend

APIs, services and the business logic behind them

8
.NET 8C#ASP.NET CoreWeb APISignalREntity FrameworkClean Architecture.NET 10

Frontend

Fast, accessible interfaces people enjoy using

6
ReactNext.jsTypeScriptAngularFramer MotionTailwind CSS

Data & Cloud

Storage, deployment and scaling you can rely on

7
SQL ServerPostgreSQLAzureFirebasePrismaDockerAWS

AI & Integrations

LLMs, messaging, payments and third-party APIs

7
OpenAI APIWhatsApp Cloud APIStripeREST APIsWebhooksMeta Cloud APITikTok API
Why It Works

Built different. Delivered right.

Most freelancers write code. I build systems. Here's what actually makes the difference.

Enterprise-Grade Architecture

I write code that handles 10× the load from day one. Clean architecture, proper separation of concerns, zero technical debt that will bite you 6 months in.

Full-Stack End to End

Backend, frontend, mobile and AI — one engineer who owns the whole product. No handoff gaps, no blame-passing, no coordination overhead.

Business-First Thinking

I understand your workflows before writing a line. The system fits your business, not the other way around. I ask the right questions so you don't have to.

You're Never in the Dark

Weekly demos, transparent milestones and a 24-hour reply guarantee. You always know exactly where your project stands — no radio silence, ever.

Client feedback

What clients say

1 / 7
Fiverr

“Working with Yasir has been a pleasure so far. The team have shown nothing but politeness, professionalism and a real want to ensure what they produce is exactly as requested. I look forward to developing this professional relationship.”

s

shifthappensuk

CEO

Fiverr

“Yasir Rehman's work in software development was EXEMPLARY! His attention to detail and code expertise truly shone through in the delivery, and working with him was a breeze thanks to his quick responsiveness and professional approach. Plus, he went above and beyond expectations, making the entire experience top-notch.”

k

kehaglem

CEO

Fiverr

“I got exactly what I was looking for. Seller is very good at what he does and he responds swiftly to my comments and queries. Very good, i would love to work again with him”

ProjectBug Fixes — Up to $50 • 5 days

v

vusalpashall

Bug Fixes • Azerbaijan

Ready when you are

Let's turn your idea into a
system that scales.

Join 50+ clients who shipped reliable software with me. Tell me what you're building — I'll reply within 24 hours with a clear plan.

Start your projectTry the tools