I'm a Senior Full-Stack Engineer with 8+ years of experience building scalable web, mobile, and cloud-native applications across fintech, healthcare, SaaS, e-commerce, and enterprise platforms. I enjoy turning complex business problems into reliable, high-performance software that scales. Over the years, I've designed and built RESTful APIs, microservices, real-time applications, and modern frontend experiences using Ruby on Rails, Node.js (Express/NestJS), Python (Django/FastAPI), React, Next.js, and React Native. My experience spans the full software development lifecycle, from architecture and database design to cloud deployments, CI/CD, and production monitoring on AWS. More recently, I've been helping teams integrate Generative AI into real products rather than building AI demos. I've developed LLM-powered assistants, AI-driven document intelligence, workflow automation, intelligent search, and business tools using OpenAI APIs, Retrieval-Augmented Generation (RAG), vector databases, embeddings, prompt engineering, and AI agent workflows. I also use modern AI development tools such as Cursor, GitHub Copilot, Claude, and ChatGPT to accelerate development while maintaining code quality and engineering standards. I enjoy solving performance and scalability challenges, whether that's optimizing SQL queries, designing event-driven architectures, integrating third-party APIs, implementing caching strategies, or building resilient backend systems that support thousands of concurrent users. I believe great software isn't just about writing code, it's about understanding the business, collaborating with stakeholders, and delivering solutions that create measurable impact. Core expertise: • Full-Stack Development (Ruby on Rails, Node.js, Python, React, Next.js, React Native) • AI & LLM Integrations (OpenAI API, RAG, AI Agents, Prompt Engineering, AI Automation) • Cloud & DevOps (AWS, Docker, Kubernetes, GitHub Actions, CI/CD) • Databases (PostgreSQL, MySQL, MongoDB, Redis) • System Design, Microservices, REST APIs, GraphQL, Performance Optimization I'm always interested in opportunities involving AI-powered products, developer tools, SaaS platforms, mobile applications, cloud-native systems, and modern full-stack engineering.

Hafiz Ahmed

I'm a Senior Full-Stack Engineer with 8+ years of experience building scalable web, mobile, and cloud-native applications across fintech, healthcare, SaaS, e-commerce, and enterprise platforms. I enjoy turning complex business problems into reliable, high-performance software that scales. Over the years, I've designed and built RESTful APIs, microservices, real-time applications, and modern frontend experiences using Ruby on Rails, Node.js (Express/NestJS), Python (Django/FastAPI), React, Next.js, and React Native. My experience spans the full software development lifecycle, from architecture and database design to cloud deployments, CI/CD, and production monitoring on AWS. More recently, I've been helping teams integrate Generative AI into real products rather than building AI demos. I've developed LLM-powered assistants, AI-driven document intelligence, workflow automation, intelligent search, and business tools using OpenAI APIs, Retrieval-Augmented Generation (RAG), vector databases, embeddings, prompt engineering, and AI agent workflows. I also use modern AI development tools such as Cursor, GitHub Copilot, Claude, and ChatGPT to accelerate development while maintaining code quality and engineering standards. I enjoy solving performance and scalability challenges, whether that's optimizing SQL queries, designing event-driven architectures, integrating third-party APIs, implementing caching strategies, or building resilient backend systems that support thousands of concurrent users. I believe great software isn't just about writing code, it's about understanding the business, collaborating with stakeholders, and delivering solutions that create measurable impact. Core expertise: • Full-Stack Development (Ruby on Rails, Node.js, Python, React, Next.js, React Native) • AI & LLM Integrations (OpenAI API, RAG, AI Agents, Prompt Engineering, AI Automation) • Cloud & DevOps (AWS, Docker, Kubernetes, GitHub Actions, CI/CD) • Databases (PostgreSQL, MySQL, MongoDB, Redis) • System Design, Microservices, REST APIs, GraphQL, Performance Optimization I'm always interested in opportunities involving AI-powered products, developer tools, SaaS platforms, mobile applications, cloud-native systems, and modern full-stack engineering.

Available to hire

I’m a Senior Full-Stack Engineer with 8+ years of experience building scalable web, mobile, and cloud-native applications across fintech, healthcare, SaaS, e-commerce, and enterprise platforms. I enjoy turning complex business problems into reliable, high-performance software that scales.
Over the years, I’ve designed and built RESTful APIs, microservices, real-time applications, and modern frontend experiences using Ruby on Rails, Node.js (Express/NestJS), Python (Django/FastAPI), React, Next.js, and React Native. My experience spans the full software development lifecycle, from architecture and database design to cloud deployments, CI/CD, and production monitoring on AWS.
More recently, I’ve been helping teams integrate Generative AI into real products rather than building AI demos. I’ve developed LLM-powered assistants, AI-driven document intelligence, workflow automation, intelligent search, and business tools using OpenAI APIs, Retrieval-Augmented Generation (RAG), vector databases, embeddings, prompt engineering, and AI agent workflows. I also use modern AI development tools such as Cursor, GitHub Copilot, Claude, and ChatGPT to accelerate development while maintaining code quality and engineering standards.
I enjoy solving performance and scalability challenges, whether that’s optimizing SQL queries, designing event-driven architectures, integrating third-party APIs, implementing caching strategies, or building resilient backend systems that support thousands of concurrent users. I believe great software isn’t just about writing code, it’s about understanding the business, collaborating with stakeholders, and delivering solutions that create measurable impact.
Core expertise:
• Full-Stack Development (Ruby on Rails, Node.js, Python, React, Next.js, React Native)
• AI & LLM Integrations (OpenAI API, RAG, AI Agents, Prompt Engineering, AI Automation)
• Cloud & DevOps (AWS, Docker, Kubernetes, GitHub Actions, CI/CD)
• Databases (PostgreSQL, MySQL, MongoDB, Redis)
• System Design, Microservices, REST APIs, GraphQL, Performance Optimization
I’m always interested in opportunities involving AI-powered products, developer tools, SaaS platforms, mobile applications, cloud-native systems, and modern full-stack engineering.

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Experience Level

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Work Experience

Senior Full-Stack Engineer at Frontline Data Solutions
May 1, 2023 - Present
Scaled backend services to support 300K+ active users with sub-200ms p95 latency by designing RESTful APIs and real-time features using Ruby on Rails and Node.js (Express/NestJS). Reduced manual operational effort by 55% by shipping OpenAI-powered assistants, document processing, and workflow automation. Improved database performance by tuning PostgreSQL/MongoDB/MySQL/Redis (query optimization, indexing, async processing), cutting average query latency by 40%. Increased deployment frequency 3x with <2% change-failure rate using AWS (EC2/ECS/Lambda/RDS/S3), Docker, Kubernetes, and GitHub Actions. Hardened access control with OAuth2, JWT, and RBAC, achieving zero access-control incidents across two security audits. Led architecture/code reviews for a 7–9 engineer team and improved sprint cycle time by 25%.
Full-Stack Developer II at DevOrbit
October 1, 2019 - April 1, 2023
Delivered customer-facing SaaS products for 50K+ active users across three products using Ruby on Rails, Node.js, and React. Modularized a monolithic codebase into maintainable services, reducing deployment time by 30%. Improved high-traffic performance by reducing average API response time by 35% via PostgreSQL/MongoDB optimizations and Redis caching. Enabled secure third-party integrations (8+ payment gateway and CRM integrations) using REST APIs, background jobs, and service connections. Reduced release regressions by 40% by building automated unit/integration/E2E coverage (RSpec, Minitest, Selenium, Cypress).
Software Engineer at Remotebase
October 1, 2017 - September 1, 2019
Sustained production application reliability with 99.9% uptime by building and maintaining features in Ruby on Rails, JavaScript, and PostgreSQL. Reduced report generation time by 50% by creating reporting modules and optimizing SQL queries. Improved stability by reducing mean time to resolution by 30% through root-cause analysis and long-term production fixes. Enabled external service integrations (5+ third-party integrations) by designing and consuming RESTful APIs for payment gateways and authentication providers.

Education

B.Sc. Computer Science at Superior College
January 1, 2013 - January 1, 2017
B.Sc. Computer Science at Superior College
January 1, 2013 - January 1, 2017

Qualifications

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Industry Experience

Financial Services, Healthcare, Software & Internet, Education