Muddasar Hussain

Full Stack Engineer

Remote · All-in-one coaching software

• Built a production-grade Twilio SMS notification system with E.164 validation, consent checks, transactional credit deduction, and retry/backoff handling.
• Engineered a three-domain marketplace billing system covering SaaS subscriptions, Stripe Connect payouts, and PayPal — with webhook idempotency and atomic transactions.
• Owned cross-integration reliability across Cronofy, Mailchimp/Mandrill, Zoom, and Google Meet, adding two-way calendar sync and async failure processing to improve deliverability by 35%.
• Integrated Hasura with the Rails backend for real-time GraphQL operations, reducing data fetch time by 45% and enabling instant updates across user dashboards.
• Developed and optimized Mandrill and Mailchimp templates across transactional and marketing campaigns, improving email deliverability and user engagement by 10%.

Software Engineer

Lahore, Pakistan

• Improved deployment stability across distributed systems by 8% in 3 months by implementing CI/CD workflows, enabling faster, more reliable releases.
• Built Stripe-based SMS credit monetization with direct purchase, auto top-up, off-session PaymentIntent flows, rate limiting, and automated confirmation notifications, improving revenue conversion by 20%.
• Cut page load time 20% for high-interaction use cases by replacing heavy patterns with Zustand, SWR, Axios, and Formik.

• Selected as part of Microsoft’s global student ambassador community to support peer learning, foster tech communities, and promote technical skill development among students.

• Delivered a comprehensive virtual seminar to 100+ computer science students via Microsoft Teams, covering advanced Next.js frameworks, modern web development trends, and industry best practices.