01
Context First
Tickets, repo history, design intent, and acceptance criteria get loaded before anyone touches code.
TERMINAL
Quick Summary
Skip the scrolling. Type 'help' after the initial sequence.
resume.sh
IMPACT
Code that powers 10M+ interviews
Not a side project. Not a prototype. Production infrastructure used by millions of developers globally.
10M+ Developer interviews powered annually
40+ Countries where HackerRank runs
200K+ Sessions replayed per month
10+ Years shipping to production
50+ Engineers mentored
15+ Products shipped to prod
SHIPPED
What I've Shipped
Real systems, real impact. Each card is a production story.
HackerRank
Session Recording & Replay
rrweb-based integrity platform with full session replay and signal correlation
200K+ sessions/month
rrwebReactTypeScriptWebSockets
HealthifyMe
OneConnect Real-Time Chat
WebSocket-powered chat system connecting users with health coaches at scale
60% coach engagement lift
WebSocketsReactNode.js
HackerRank
Frontend Clickstream SDK
Framework-agnostic event tracking SDK used across the entire HackerRank platform
Platform-wide adoption
TypeScriptSDK DesignReact
HackerRank
AI Code Review System
AI-powered automated code review pipeline integrated into the engineering workflow
Shipped for web teams
LLMTypeScriptReactNode.js
HealthifyMe
Monorepo Web Infrastructure
Full monorepo platform built from scratch — React, Node.js, Docker, AWS ECS CI/CD
Scaled 0 to 10 engineers
ReactNode.jsDockerAWS
HackerRank
WCAG 2.1 Accessibility Overhaul
Full accessibility audit and remediation across the Interviews platform
Org-wide compliance
WCAG 2.1ReactTypeScript
HackerRank
HackerRank Proctor
Real-time proctoring solution with live signals — tab switches, copy-paste detection, focus loss events — integrated into millions of assessments
Real-time integrity at scale
ReactWebSocketsrrwebTypeScript
HackerRank
AI Test Case Generator
LLM-powered tool that generates unit test cases from function signatures — reduced test-writing time by 60% for engineering teams
Shipped to all web teams
LLMTypeScriptReactNode.js
HackerRank
Unified Auth & HTTP Platform
Org-wide shared SDKs — Auth, HTTP client, Logger, AI Platform, Clickstream — standardized the web stack across all HackerRank products
6 shared SDKs, 1 standard
TypeScriptSDK DesignReactNode.js
HealthifyMe
HealthifyMe Marketing Platform
Config-driven SSR marketing platform built with Remix — blazing fast, SEO-optimized, used by millions of health-conscious users across India
60%+ organic traffic lift
RemixSSRNode.jsSEO
STRENGTHS
Staff Engineer Superpowers
The four ways I help engineering orgs scale systems, raise standards, and compound output.
Platform Architect
6 platforms. 10M+ interviews. 200K+ sessions/month.
6
platforms
10M+
interviews/year
200K+
sessions/month
Designed and shipped Auth, HTTP, AI, Clickstream, Logger, and Session Recording systems — plus the operating patterns that let orgs move fast without turning the platform into a tax.
AI Pioneer
4 AI workflows. 1 next-gen operating model.
4
AI workflows
1
AIDLC system
50+
engineers helped
Built AI Code Review, AI Test Case Generation, AI Interviewer foundations, and now HackerRank AIDLC — applying AI agents to real engineering loops instead of one-off demos.
Engineering Multiplier
50+ engineers. 5 migrations. 3 companies.
50+
engineers
5
migrations
3
companies
Mentored across orgs, defined standards, led architecture reviews, and drove migrations across runtime, typing, accessibility, design systems, and platform shape.
Frontend Craftsman
10+ years. 75% faster. 40+ countries.
10+
years
75%
faster
40+
countries
JavaScript internals, React architecture, CSS motion, WCAG 2.1, and performance budgets — interfaces tuned for real scale, real reliability, and real users.
AI-NATIVE SDLC
HackerRank AIDLC
A brief look at the next-gen development lifecycle I'm shaping with AI agents in the loop and engineering judgment at the center.
HackerRank AIDLC
A next-gen development lifecycle powered by AI agents. The system handles context gathering, scoped execution, review prep, and verification loops while engineers keep the hard parts: product judgment, architecture, and the final call.
observe -> plan -> delegate -> review -> verify -> ship
5
stages with explicit gates
4
AI-assisted engineering loops
1
human owner for judgment
0
skipped verification passes
02
Agentic Execution
Specialist AI agents take scoped work across planning, implementation, and patch prep with clean ownership.
03
Review Chain
Diffs are routed through human judgment, senior review, and PR-quality communication instead of raw output.
04
Verification Gates
Lint, types, tests, security, and visual checks run before the branch earns the right to merge.
05
Confident Ship
The final result is faster iteration with tighter standards, not faster chaos wearing an AI label.
PROOF
Transformation Ledger
Before and after numbers from the systems I changed. This is where architecture turns into measurable outcomes.
75% faster
CRM Performance
Before
15s load time
After
4s load time
Rebuilt the internal CRM experience so support teams stopped waiting on the UI.
service ops upgrade
Support Quality
Before
fragmented service workflow
After
+30% CSAT / -40% resolution time
Built the dashboard and operating flow that improved customer outcomes, not just internal tooling aesthetics.
platformized observability
Integrity Platform
Before
isolated integrity signals
After
200K+ session replays / month
Connected rrweb replay with proctoring signals so integrity moved from guesswork to evidence.
real-time system
Engagement Loop
Before
asynchronous coaching touchpoints
After
+60% coach engagement
Designed OneConnect as a live conversation product that changed behavior, not just message delivery.
org-wide leverage
Platform Standard
Before
every team solved it differently
After
6 shared SDKs / 1 web standard
Standardized Auth, HTTP, Logger, AI, Clickstream, and Session Recording into reusable platform primitives.
5 major migrations
Stack Modernization
Before
Node 14 + Flow + uneven accessibility
After
Node 18 + TypeScript + WCAG 2.1
Led multi-year modernization without freezing delivery velocity across products.
COMMITS
My GitHub City
A skyline built from this calendar year of GitHub activity. Each tower is a day, each block is a week, and you can drag, pan, and zoom to read the shape of the year so far.
SKILLS
Skills & Expertise
A decade of building for the web — plus applied AI. Filter by category and hover to explore depth.
JavaScript
TypeScript
React
Next.js
HTML
CSS
Node.js
Python
Docker
AWS
LLM Integration
AI Agent Systems
Prompt Engineering
PHILOSOPHY
The Craft
What I believe about building software that lasts.
I build platforms so engineers can build products.
10M+ interviews run on infrastructure I designed.
The best code is the code your team never has to think about.
AI is a tool. Judgment is the skill.
— Hannad Rehman, Staff Software Engineer
EXPERIENCE
Experience
Scroll to watch the journey unfold. Click entries to expand details.
Apr 2023 – Present
HackerRankStaff Software Engineer
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. Now shaping HackerRank AIDLC, a next-gen development lifecycle powered by AI agents across planning, implementation, review, and verification while engineers stay in control of architecture and judgment. 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.
Jun 2018 – Apr 2023
HealthifyMeLead Software Engineer
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.
Nov 2015 – May 2018
InfosysSenior Systems Engineer
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.
2015
Galgotias UniversityEducation
Bachelor of Technology (B.Tech) — Computer Science Engineering, Galgotias University | CGPA: 7.41
Open to Staff / Principal roles
Let's Build Something
Legendary
I raise the bar on every system I touch — let's talk.
Email me directlyconnect@hannadrehman.com// I don't just ship features — I raise the bar