Hannad Rehman

Staff-level technical leader driving the evolution of HackerRank's web platform, quality engineering, and integrity systems across core products. Leading org-wide initiatives across Web Platform, Quality Engineering, IDEs, Integrity, and AI-powered tooling. Designed and built an end-to-end Session Recording & Replay platform (rrweb-based), integrated with integrity signals; currently processing 200K+ sessions/month. Designed the framework-agnostic frontend Clickstream SDK used across the entire HackerRank web platform. Architected the frontend foundation for the AI Interviewer product and shipped HackerRank Proctor for real-time integrity signals. Built an AI-powered Code Review system and AI Test Case Generator for web teams. Standardized and shipped shared web SDKs and platforms (Auth, HTTP, AI Platform, Unified Logger). Led migrations from Node.js 14 → 18 and Flow → TypeScript; championed WCAG 2.1 accessibility across the Interviews platform. Led UI modernization to HRDS (HackerRank Design System). Senior mentor through code reviews, architectural guidance, and cross-team collaboration with principal architects.

Technical owner of HealthifyMe's web platform, scaling systems and teams during rapid business growth. Designed and built the entire web infrastructure from scratch using a monorepo architecture with React, Node.js, Docker, and AWS. Established CI/CD pipelines for containerized web applications deployed on AWS ECS. Implemented observability and monitoring using New Relic and Sentry. Led and mentored a team of 10 frontend engineers. Built a customer service dashboard that improved CSAT by 30% and reduced ticket resolution time by 40%. Rebuilt the internal CRM platform, reducing load time from 15s to 4s. Designed and built OneConnect, a real-time chat platform that increased user engagement with coaches by 60%. Built a high-performance SSR marketing platform using Remix with a config-driven architecture. Key applications: Connect (CRM), Payments Infra, HealthifyMe Pro, Healthify Studio, Healthify Sense, Healthify Plus, VaccinateMe.com, OneConnect, Marketing Landing Platform.

Designed and delivered multiple client-side web applications in the ed-tech domain using JavaScript and React. Led the transition from vanilla JavaScript to modern React-based architectures. Mentored engineers on React, UI architecture, and best practices. Collaborated closely with stakeholders and leadership to align technical execution with business goals. Key applications: Lex (online learning platform), Q&A Portal, Learning Analytics Dashboard, KnowledgeHub.