Senior Full Stack & Cloud Architect · $650K+ on Upwork · Now taking direct projects
Khalil Muhammad
12+ years building systems for the UN, fintech platforms, healthcare APIs, and enterprise SaaS. Clients keep coming back — many off-platform for years.
Companies I've Worked With
About Me
Senior Full Stack & Cloud Architect with 12+ years of experience designing, building, and scaling complex web applications. Expertise in workflow automation, AI-driven products, and deep API integrations across fintech, healthcare, e-commerce, and enterprise platforms.
Proficient in React, Golang, Node.js, Python, JavaScript, and TypeScript — with a strong foundation in system architecture, performance optimisation, and cloud infrastructure.
$650K+ earned on Upwork as a Top Rated Plus freelancer. Clients consistently return for long-term engagements — many continuing off-platform for years. Now taking on select direct partnerships.
Trusted To Build Systems Used By
Global Multinational Organizations
United Nations, enterprise-scale platforms serving users worldwide
Enterprise SaaS Platforms
Shopify apps, ERP systems, and multi-tenant architectures
Fintech & Healthcare Systems
KYC, identity verification, secure API integrations
Tech Stack
C#
10+ yrs
Go
2 yrs
Rust
2 yrs
JavaScript
10+ yrs
TypeScript
10+ yrs
Node.js
10+ yrs
Python
4+ yrs
AI / LLM (RAG)
2+ yrs
React
8+ yrs
React Native
4+ yrs
Vue.js
5+ yrs
GraphQL
5+ yrs
AWS
7+ yrs
Azure
10+ yrs
GCP
3+ yrs
SQL / MySQL
10+ yrs
NoSQL / MongoDB
10+ yrs
Docker & K8s
5+ yrs
Proven Results
0M+
Documents Indexed at the UN
Search at Scale0%
API Response Times Reduced
Performance0s
Real-time Synced Users
Across Platforms$650K+
Earned on Upwork · Top Rated Plus
Track Record30+
Microservices
Architecture99.9%
Zero Downtime · UN SLA-backed
Reliability5+
Multi-tenant
System DesignWhat I Help With
Scalable Backend Systems
Design and build high-performance APIs and microservices
Complex Integrations
Stripe, Shopify, Microsoft Graph, healthcare APIs, telecom
AI & Automation
LLM workflows, document processing, AI assistants
Identity & Security
OAuth, Entra ID, Cognito, enterprise authentication
How I Work
Flexible engagement models built around your needs — from a one-off build to a long-term technical partner.
Fixed-Scope Project
Defined deliverables and milestones with a clear estimate up front. Best for well-specified builds, integrations, and launches.
Hourly / Time & Materials
Transparent, flexible billing for evolving scope. Best for ongoing development, iterative product work, and support.
Monthly Retainer
Reserved senior-engineer capacity each month. Best for long-term product partnerships and a dependable technical lead.
What a typical engagement looks like
Scoping call
A free 30-minute call to understand the problem and your goals.
Proposal & plan
A clear plan, timeline, and honest estimate — no surprises.
Build in sprints
Iterative delivery with regular check-ins and working demos.
Handover & support
Documented, production-ready code and ongoing support.
Work Experience
Jun 2022 – Oct 2022
Rishi Srivastava
Backend Developer
Built a Python serverless invoice-processing API on AWS — Cognito auth, subscription-based throttling, S3 storage, SES/SNS email ingestion with MIME parsing, and combined PDF + Excel result delivery by email.
Mar 2023
Innoflex
Backend Developer
Set up AWS CDK infrastructure-as-code in Python for a serverless backend — three DynamoDB tables (one with a secondary index) behind a GraphQL AppSync API authenticated with a Cognito User Pool.
Sep 2023 – Nov 2023
PastureSmart
Backend Developer
Refactored and consolidated backend services on a live AWS-serverless pasture-management platform (Lambda, DynamoDB, API Gateway, GraphQL, SST/CDK), extending grazing, livestock, and soil-health features.
Mar 2024 – Apr 2024
Erez Biton
Backend Developer
Built a Python integration with the John Deere Precision Tech API to automate Precision Ag map-layer creation, generating distinct map layers from multi-channel rasters and shapefile attributes.
Mar 2024 – Apr 2024
TASK Transcription Services
Backend Consultant
Advised a Ubuntu/Python team extracting Word Count statistics from 300–400 MS Word documents a day. Replaced a planned MS 365 / Windows round-trip with direct OOXML parsing on their existing Linux stack — no Windows VM, Word licenses, or cloud hop.
Industries I've Worked In
International Organizations
United Nations
E-Commerce & SaaS
Shopify, Inveterate
Fintech & KYC
The ID Register
Hospitality & Supply Chain
Sysco Guest Supply
Telecom & VoIP
Telnyx, CCS
Maritime & Logistics
Crayon
Research & Analytics
Hanover Research
AI & Automation
ZOOMA, UN AI
Client Testimonials
"Khalil built our web application which integrates with CRM 2011 and pulls credit reports from third-party APIs from the ground up and did a great job. Good at communicating and collaborating, with a practical sense about how to approach big design challenges and come up with a solution. Very professional — I will absolutely work with Khalil for upcoming projects."
Mahfuz H.
Enterprise Architect · ThoughtCodes LLC
Financial Application · Aug 2020
"Khalil was very responsive and professional. He successfully completed the project on time and we are extremely happy with his work. We would definitely hire him again in the future."
Jeff K.
Project Manager · Hanover Research
PowerPoint Add-in · Sept 2023
"Khalil is awesome. English fantastic and work excellent."
Tim Bloore
CEO · Aussie Retail
Ecommerce Integration · Oct 2021
"Thank you Khalil! Great work as always!"
Jamen Tabesh
Project Manager · MMCHR
HR & Accounting System · May 2021
Frequently Asked Questions
What time zone are you in, and when can we meet?
I'm based in Islamabad, Pakistan (PKT, UTC+5), and I keep flexible hours with significant overlap into both US Pacific (PST) and Eastern (EST) time zones, as well as Europe — so finding a time to talk is rarely an issue.
Do you work on a fixed price or hourly?
Both. Fixed-scope projects for well-defined work, and hourly or monthly retainers for ongoing or evolving development. We'll pick whatever fits your project on our first call.
Can you sign an NDA?
Absolutely. I regularly work under NDAs and am happy to sign one before we discuss any sensitive details.
Do you work solo or with a team?
I work hands-on as your lead engineer and architect. For larger builds I can bring in vetted specialists while staying accountable for delivery end to end.
What size of project do you take on?
Anything from a focused integration or automation to a multi-month platform build. If you're not sure it's a fit, book a call and we'll scope it together.
How do we get started?
Book a free 30-minute scoping call. You'll walk away with a clear plan and an honest estimate — no obligation.
Book a Free 30-min Scoping Call
Get In Touch
© 2026 Khalil Muhammad. All rights reserved.