Hafiz M. Ahmad

Senior Ruby on Rails Developer • Full Stack Engineer

Lahore, Punjab, Pakistan

Summary

Senior Full Stack Software Engineer with 5+ years of experience building scalable SaaS platforms, web applications, mobile apps, desktop software, and AI-powered products.

My primary expertise is Ruby on Rails backend development, where I design scalable architectures, REST APIs, CMS platforms, payment systems, and production-ready applications. Alongside Rails, I build modern frontend applications using React, Next.js, React Native, and Electron to deliver complete end-to-end solutions.

Throughout my career I've worked with startups, agencies, and international clients building products ranging from Shopify applications and SaaS platforms to AI-powered business automation tools and internal enterprise systems.

I enjoy solving challenging engineering problems, improving application performance, simplifying complex workflows, and building software that scales.

Contact

Phone: +92 323 4310553
Email: hafiz.muhammad.ahmad4277@gmail.com
Website: https://www.devhafizahmad.com
LinkedIn: https://www.linkedin.com/in/hafiz-m-ahmad-8b4792207/
GitHub: https://github.com/iamHafizAhmad

Areas of Expertise

Category	Technologies
Backend	Ruby on Rails, Ruby, Node.js, Express.js, Python, REST APIs, GraphQL, PostgreSQL, Redis, Sidekiq
Frontend	React, Next.js, JavaScript, TypeScript, Tailwind CSS, Bootstrap, HTML5, CSS3
Mobile & Desktop	React Native, Electron.js
AI	OpenAI, Local LLMs, LangChain, RAG, Prompt Engineering, AI Automation
E-Commerce	Shopify Apps, Shopify APIs, Stripe, Payment Gateways
Cloud & DevOps	Docker, AWS, GitHub Actions, Linux, NGINX, Vercel
Database	PostgreSQL, MySQL, MongoDB, Redis
Tools	Git, GitHub, Postman, Jira, VS Code

Professional Experience

DevCacoon

Remote • January 2023 – Present

Senior Full Stack Software Engineer

January 2025 – Present

Leading development of scalable SaaS products and AI-powered applications for international clients.

Responsibilities include:

Architecting scalable Ruby on Rails applications
Designing REST APIs
Building React & Next.js frontends
Developing AI-powered features using OpenAI and Local LLMs
Building Shopify applications
Stripe payment integrations
System architecture decisions
Mentoring junior developers
Production deployments
Performance optimization

Technologies

Ruby on Rails • React • Next.js • TypeScript • PostgreSQL • Docker • AWS • OpenAI • Local LLMs • Shopify • Stripe

React Native Developer

January 2024 – January 2025

Built cross-platform mobile applications used by businesses and startups.

Responsibilities:

Developing React Native applications
API integrations
Push notifications
Authentication systems
Performance optimization
State management
Publishing production builds

Technologies

React Native • React • JavaScript • TypeScript • Redux • Firebase • REST APIs

Ruby on Rails Backend Developer

January 2023 – January 2024

Worked primarily on backend systems powering SaaS products.

Responsibilities:

Building APIs
Database design
Authentication
CMS development
Admin dashboards
Background jobs
Third-party integrations
Payment gateways
PostgreSQL optimization

Technologies

Ruby on Rails • PostgreSQL • Redis • Sidekiq • Docker • AWS • Stripe

Upwork

Remote • May 2021 – Present

Full Stack Ruby on Rails Developer

May 2023 – Present

Working with startups and businesses worldwide delivering complete web applications.

Projects include:

SaaS platforms
Shopify Apps
AI integrations
CMS systems
Admin dashboards
Payment gateways
API development
React frontends
React Native applications

Technologies

Ruby on Rails • React • Next.js • React Native • Shopify • Stripe • PostgreSQL • OpenAI

Electron.js & Node.js Developer

May 2021 – May 2023

Built desktop applications and internal automation tools.

Responsibilities:

Electron desktop apps
Node.js backend services
File system automation
Logging systems
API integrations
Windows utilities
Cross-platform desktop software

Technologies

Electron.js • Node.js • JavaScript • TypeScript • SQLite • React

Gain Impact

Netherlands • Remote • January 2022 – September 2024

Ruby on Rails Backend Developer

January 2023 – September 2024

Built scalable backend systems powering SaaS applications.

Responsibilities:

Rails APIs
PostgreSQL
CMS platforms
Authentication
Admin panels
Business logic
Third-party integrations

Technologies

Ruby on Rails • PostgreSQL • Redis • REST APIs • Stripe

Frontend Developer

January 2022 – January 2023

Built responsive interfaces and reusable frontend components.

Responsibilities:

React development
Tailwind CSS
Responsive UI
Component architecture
API integration
Performance optimization

Technologies

React • Tailwind CSS • JavaScript • TypeScript

National Transmission & Dispatch Company (NTDC)

Pakistan • On-site • January 2021 – April 2021

Frontend Developer Intern

Worked on improving internal web applications.

Responsibilities:

React development
API integrations
Responsive layouts
Component refactoring
Bug fixing
UI improvements

Technologies

React • JavaScript • HTML • CSS • Bootstrap

Education

The Superior University

Bachelor of Science (BS) Computer Science

2020 – 2024

Graduated with Grade A
Runner-up in coding competitions
Cricket Team Captain
Strong focus on software engineering, algorithms, databases and scalable systems

Core Strengths

Ruby on Rails Architecture
SaaS Development
React Development
React Native
Electron Desktop Applications
Shopify App Development
REST API Development
AI Integration
Local LLM Applications
OpenAI APIs
Payment Gateway Integration
PostgreSQL Database Design
Docker Deployment
AWS Infrastructure
Clean Architecture
Performance Optimization
Scalable System Design

Last Updated: June 2026