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Haroon Fayyaz

@haroonfayyaz1

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Senior full stack engineer building scalable, high-performance web and mobile systems.

Pakistan

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What I'm looking for

I’m looking for a senior full-stack role where I can lead delivery, build scalable web/mobile systems, and drive measurable performance improvements—working with strong engineering practices, ownership, and cross-functional collaboration.

I’m a Senior Full Stack Engineer with 5 years of experience designing and building scalable web and mobile applications. I specialize in React, Vue.js, Python, and Node.js, and I focus on delivering production-ready systems that hold up under real-world load.

At Qbatch, I engineered a real-time auction bidding system using React and Django, achieving <200ms end-to-end latency for live bids. I designed scalable backend services on AWS to support concurrent bidding with high availability, and I improved code quality and deployment reliability through structured reviews and CI practices.

I also built a high-performance address lookup service using FastAPI and Elasticsearch, serving 32M+ UK addresses with <150ms query latency under production workloads. Before that, I led end-to-end fintech mobile app development at Sahelha, designing PostgreSQL schemas and AWS architecture to reach 99.9%+ uptime and optimizing APIs to deliver 30% faster response times.

Across platforms like StoreFilter and EcomCircles, I’ve shipped customer-facing UI/UX improvements and scalable data pipelines, including cutting sync times by 40% and processing 400K+ orders. I enjoy leading cross-functional teams, optimizing performance, and turning complex requirements into reliable systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Qbatch

Jan 2024 - Present (2 years 3 months)

Car.co.uk — Real-time Auction Platform
- Engineered a real-time auction bidding system using React and Django, achieving <200ms end-to-end latency for live bids.
- Designed AWS backend services for concurrent bidding with high availability and improved deployment reliability through structured reviews and CI practices.

React Django Celery AWS ECS PostgreSQL Docker Redis CI CD Real Time Systems Stripe Payment Gateways

Senior Software Engineer

Fortiq (AI-Powered CRM & Communication Platform)

Apr 2025 - Dec 2025 (8 months)

- Built AI-driven communication workflows automating lead response, qualification, and appointment booking across SMS, email, and voice channels
- Developed backend services enabling real-time, multi-channel messaging with <2s end-to-end response latency to maximize lead conversion
- Designed rule-based automation systems for follow-ups, routing, reducing manual intervention by 60%

fastAPI Python React Django Django REST Framework Django Filters Redis AWS Twilio Calendly Temporal Postmark OpenAI PostgreSQL Stripe Stripe Billing

Senior Software Engineer

Qbatch

May 2023 - Dec 2023 (7 months)

Sahelha (Fintech Mobile App)
Led end-to-end development of a fintech mobile app supporting loan and mortgage workflows for 20K+ active users.
Designed PostgreSQL schemas and AWS architecture for 99.9%+ uptime and improved backend APIs/database queries to deliver 30% faster response times.

React Native Python PostgreSQL AWS Database Design System Uptime Optimization

Senior Software Engineer

Qbatch

Nov 2022 - Apr 2023 (5 months)

StoreFilter (SaaS)
Developed a SaaS platform used by 200+ stores and agencies to optimize e-commerce performance and revenue. Implemented scalable data syndication pipelines to reduce sync times by 40% and enhanced UI/UX and backend performance to increase user engagement by 25%.

Vue.Js Django MongoDB Data Pipelines UI UX API Performance Stripe Stripe Billing TailwindCSS

Senior Software Engineer

Qbatch

Jul 2021 - Oct 2023 (2 years 3 months)

EcomCircles (Dropshipping Automation Platform)
Built automation systems managing 10M+ products across 3K+ sellers and developed background services to process 400K+ orders.
Optimized PostgreSQL and AWS infrastructure to support high-scale e-commerce fulfillment workflows.

NodeJS React MySQL AWS EC2 AWS S3 Redis Stripe Subscription Management

Education

Degrees, certifications, and relevant coursework

National University of Computer and Emerging Sciences

Bachelor of Computer Science, Computer Science

2017 - 2021

Grade: CGPA: 3.61/4.00; Dean’s List of Honor (5 consecutive semesters)

Bachelor’s in Computer Science from the National University of Computer and Emerging Sciences (2017–2021). Graduated with a CGPA of 3.61/4.00 and made the Dean’s List of Honor for five consecutive semesters.