Abdul Rehan Qureshi

About Abdul Rehan Qureshi

Frontend Engineer with 7 years of experience building scalable fintech web applications using React.js and Next.js. Expertise in frontend architecture, reusable component design, performance optimization, and UX enhancements.Hands-on experience with Cloudflare deployments and implementing secure CI/CD pipelines, along with strong focus on code quality and compliance using SonarQube and Semgrep aligned to Infra, Audit, and VAPT standards.Actively involved in RCA and Incident Management, and driving test automation through Unit, Integration, and End-to-End testing using Playwright. Proven team player with experience mentoring developers, managing teams, and enforcing engineering best practices.

Experience

1. Senior Software Engineer

   GrayQuest

   Oct 2024 — Present · Mumbai, IN

   Core Responsibilities:Translated complex business requirements into scalable, maintainable system features for customer-facing portals (SaaS FMS, SDK) and internal admin tools.Identified and resolved production/staging issues through systematic debugging, RCA, and preventive measures to ensure long-term system stability.Collaborated with DevOps to streamline CI/CD pipelines, deployment strategies, and rollback protocols.Performance & Optimization:Improved system efficiency by 30%+ through code splitting, tree shaking, and asset optimization (lazy loading, preload/prefetch).Reduced re-renders by 40% using memoization (useMemo, useCallback), throttling/debouncing, and React Query for state management.Enhanced rendering performance via adaptive loading, list virtualization, and hybrid SSR/CSR strategies in Next.js.Security & Stability:Mitigated security risks (XSS, CSRF, CORS) through secure coding practices, HTTP headers, rate-limiting, and DDoS protection.Implemented IAM-based permissions, audit logs, and error boundaries to prevent UI crashes.Code Quality & Maintenance:Refactored legacy code using design patterns (HOC, Container-Presentational Components) and reusable component architecture.Upgraded dependencies, ensured backward compatibility, and maintained documentation via Storybook.Monitoring & Analytics:Tracked system health using Prometheus metrics, Grafana dashboards, and real-time alerting.Integrated Mixpanel, GA4, and custom event tracking to analyze user behavior and optimize engagement.Leadership & Collaboration:Led sprint planning, backlog grooming, and daily stand-ups as acting Scrum Master.Collaborated cross-functionally with product managers, designers, and backend teams to align technical execution with business goals.Key Tools & Tech: React, Next.js, TypeScript, Redux/Zustand, AWS, Docker, Jenkins, Webpack, React Testing Library,SSR,Agile

Education

• JAI HIND COLLEGE, MUMBAI

  Bachelor's degree, Information Technology

  2016 — 2019

• Yashwantrao Chavan Maharashtra Open University

  Master of Computer Applications - MCA, Information Technology