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Senior Full-Stack Engineer with 5+ years architecting and shipping production SaaS platforms and mobile applications, with measurable impact on performance, reliability, and user engagement. Strong in React Native and frontend, with solid Node.js backend experience and increasing focus on AI-driven features and LLM integration via OpenAI API.…

GHULAM MUSTAFA

Software Engineer, Full Stack Developer, Back-End Developer, +2

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Senior Full-Stack Engineer with 5+ years architecting and shipping production SaaS platforms and mobile applications, with measurable impact on performance, reliability, and user engagement. Strong in React Native and frontend, with solid Node.js backend experience and increasing focus on AI-driven features and LLM integration via OpenAI API.…

Available to hire

Senior Full-Stack Engineer with 5+ years architecting and shipping production SaaS platforms and mobile applications, with measurable impact on performance, reliability, and user engagement. Strong in React Native and frontend, with solid Node.js backend experience and increasing focus on AI-driven features and LLM integration via OpenAI API.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Urdu

Advanced

Work Experience

Senior Full-Stack & Mobile Engineer (Senior Software Engineer) at Lumida Wealth

August 1, 2025 - June 30, 2026

Architected and shipped investor-facing features such as portfolio tracking, real-time data sync, and OAuth2 authentication across iOS, Android, and Web while sustaining 99% uptime. Integrated LLM-powered insights and AI-driven data visualizations using the OpenAI API to accelerate investor decision workflows and improve feature adoption. Established a monthly release cadence delivering zero production rollbacks across 6+ consecutive sprints through disciplined CI/CD and cross-functional QA. Enforced WCAG 2.1 accessibility and pixel-perfect responsive design across all device breakpoints, reducing UI bug reports by 35%.

Mobile App Developer at Unilever Pakistan

August 1, 2022 - December 31, 2024

Maintained and scaled the mission-critical 'Roll' app processing thousands of B2B transactions daily across Pakistan’s distributor network. Increased engagement by 30% through targeted UX redesigns, onboarding flow optimization, and performance-focused feature rollouts. Sustained 99% app uptime using Sentry-based error monitoring, proactive error boundary implementation, and a structured incident response process.

Software Engineer at Udhaar Book

June 1, 2022 - July 31, 2025

Owned end-to-end delivery of core ledger, credit management, and digital payment flows for 100,000+ SMBs, directly impacting revenue and user retention. Reduced app load times by 40% using React Native lazy loading, FlatList virtualization, Hermes engine tuning, and memoization (measured via Flipper profiling). Refactored the data layer using WatermelonDB and migrated core ledger/credit flows to improve offline reliability and reduce session drop-off by 25% on low-bandwidth networks. Drove consistent monthly release cadence across iOS and Android over 3 years, improving retention quarter-over-quarter through disciplined feature iteration.

MERN Stack Developer at Inaequo Solutions

June 1, 2021 - May 31, 2022

Delivered React Native, Node.js, and NestJS solutions across multiple international client engagements, building interactive UIs that drove a 25% increase in user engagement. Operated in Agile sprints with globally distributed cross-functional teams, improving code reusability and consistently meeting delivery milestones.

Full-Stack Engineer at Dastgyr

June 1, 2021 - May 31, 2022

Built the picker app from scratch as the sole developer, and contributed to retailer and driver app features as part of the engineering team, collectively processing 10,000+ orders per day with sub-200ms UI response times. Collaborated on optimizing Node.js/NestJS and PostgreSQL backend services, contributing to a 50% reduction in API response times and enabling 3× traffic growth without infrastructure changes. Reduced mobile crash rate from 5% to 2% by integrating Crashlytics, implementing structured error handling, and resolving critical native module issues.

Software Engineer at Quanrio

November 1, 2019 - August 31, 2020

Built and deployed React and React Native consumer applications used by thousands of users. Improved backend data processing efficiency by 40% via Koa.js, NestJS, and PostgreSQL API redesign. Introduced Swagger API documentation and used Trello-based sprint tracking to reduce cross-team integration overhead and miscommunication.