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Backend & Systems 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.

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Companies I've Worked With

About Me

Full-Stack Developer 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 freelancer. Clients consistently return for long-term engagements — many continuing off-platform for years. Now taking on select direct partnerships.

Islamabad, Pakistan
+92 334 3145541
khalilmohammadmirza@gmail.com
12+ Years Experience
$650K+ on Upwork · Top Rated

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

Go

3 yrs

JavaScript

10+ yrs

Node.js

10+ yrs

TypeScript

10+ yrs

React

8+ yrs

Python

4 yrs

AWS

8+ yrs

GCP

8+ yrs

Azure

3 yrs

SQL / MySQL

10+ yrs

NoSQL / MongoDB

10+ yrs

Docker & K8s

5+ yrs

Proven Results

100%

Data Backlogged to Save Millions

Impact

0%

Customer Retention Achieved

Business Value

0% → 0%

Conversion Growth

Outcomes

$650K+

Earned on Upwork · Top Rated

Track Record

30+

Microservices

Architecture

99.9%

Zero Downtime

Migration

5+

Multi-tenant

System Design

What 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

Work Experience

May 2013 – Oct 2017

Guest Supply

Full Stack Developer

Designed, developed, and maintained back-end applications. Mentored junior developers and managed Linux servers.

View Case Study

Oct 2017 – Jan 2019

MMCHR

Lead Developer

Independently designed and developed a comprehensive enterprise platform unifying HR, accounting, and travel management.

View Case Study

Oct 2018 – Jan 2021

GrocerKey

Full Stack Developer

Contributed to a multi-tenant e-commerce platform enabling traditional retailers to launch scalable online stores.

View Case Study

Apr 2019 – Oct 2019

FlowFact GmbH

Backend Engineer

Developed Microsoft Office add-ins integrated with CRM systems, implementing cross-cloud identity federation between Azure AD and AWS Cognito.

View Case Study

Sep 2019 – Dec 2019

Patent Bots

Backend Engineer

Enhanced an AI-powered Microsoft Word add-in for patent drafting, analysis, and validation using NLP-based tools.

View Case Study

Jul 2020 – Present

United Nations

Full Stack Developer

Enhanced linguistic apps including eLUNa translation tool, editorial platform, and multilingual search engine for UN translators.

View Case Study

Sep 2020 – Jan 2021

InnRoad

Full Stack Developer

Developed comprehensive QuickBooks integration connecting property management software with QuickBooks Online and Desktop.

View Case Study

Sep 2020 – Dec 2021

Conestoga College

Backend Engineer

Led the development of a fully standards-compliant LTI 1.3 integration enabling secure communication between LMS and external tools.

View Case Study

Dec 2020 – Jan 2021

New York Web Studios

Backend Engineer

Developed healthcare system integrations and a custom electronic signature platform for secure data exchange across medical systems.

View Case Study

Dec 2020 – Jun 2022

Inveterate

Back End Developer

Built membership and loyalty Shopify application with third-party API integrations.

View Case Study

Jan 2021 – Apr 2021

Cannect Mortgage

Full Stack Developer

Developed a full-scale investment management platform streamlining the entire mortgage investment lifecycle.

View Case Study

Jan 2021 – Mar 2021

Azura Consulting

Full Stack Developer

Developed a fully automated dropshipping platform streamlining order fulfillment, inventory management, and shipping operations.

View Case Study

Feb 2021 – Aug 2021

Xpact

Backend Engineer

Developed a high-frequency cryptocurrency trading platform for real-time market analysis and low-latency trade execution.

View Case Study

May 2021 – Jul 2021

The Wound Pros

Full Stack Developer

Developed a HIPAA-compliant digital informed consent platform for patients across web and mobile platforms.

View Case Study

Jan 2021 – Dec 2021

The ID Register

Backend Consultant

Integrated secure third-party financial APIs for KYC and identity verification on a compliance-driven platform.

View Case Study

Mar 2023 – Jul 2023

TrackResults Software

Backend Engineer

Designed and implemented a comprehensive webhook system enabling real-time, bidirectional communication between internal and external systems.

View Case Study

Mar 2023 – Aug 2023

Telnyx

API Engineer

Developed REST API SDK in 6 languages with unit and integration tests for all SDKs.

May 2023 – Jun 2023

Help A Reporter Out

Automation Developer

Designed and implemented AI-powered automation workflows integrating OpenAI with journalism tools using Zapier.

View Case Study

Jun 2023 – Dec 2023

Hanover Research

Full Stack Developer

Created a PowerPoint add-in for high-quality research & analytics through a subscription model.

Sep 2023 – Mar 2025

Contact Center Specialists

Senior Full Stack Developer

Built APIs and integrations with Facebook, Sinch for VOIP solutions and marketing automation.

Jul 2024 – Feb 2025

Crayon

Full Stack Developer

Developed an application monitoring and improving Cargo Vessel performance.

Oct 2024 – Mar 2025

ZOOMA

Senior Back End Developer

Created an Azure Managed Application for Azure MarketPlace automating ADP-to-Entra ID syncing and on/off-boarding workflows.

Industries I've Worked In

International Organizations

United Nations

E-Commerce & SaaS

Shopify, Inveterate

Fintech & KYC

The ID Register

Hospitality & Supply Chain

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

Book a Free 30-min Scoping Call

Get In Touch

Email

khalilmohammadmirza@gmail.com

Phone

+92 334 3145541

Location

Islamabad, Pakistan

© 2026 Khalil Mohammad Mirza. All rights reserved.