Hammad Khan | Senior Full Stack Engineer

// cat /etc/target

About Me

classified_dossier.sh

 #!/bin/bash# ═══════════════════════════════════════# CLASSIFIED — SECURITY CLEARANCE: ROOT# ═══════════════════════════════════════CODENAME="hammad_khan"TITLE="Senior Full Stack Engineer"EXPERIENCE="8+ years building systems at scale"LOCATION="Lahore, Pakistan"CLEARANCE="Level 5 — Platform Architecture"CURRENT_OP="Senior Full Stack Engineer @ NexaQuanta"declare -A ARSENAL=(  [system_design]="Microservices | Event-Driven | DDD"  [backend]="Rails | NestJS | Node | GraphQL"  [frontend]="React | Vue | Next.js | PWA"  [infrastructure]="AWS | Docker | Redis | BullMQ | K8s"  [databases]="PostgreSQL | MongoDB | MySQL | Prisma"  [security]="OWASP Top 10 | Audit Systems | HIPAA")MISSION_LOG=(  "115+ MRs delivered in 5 months @ NexaQuanta"  "Rails Core Contributor — merged PR to rails/rails"  "Zero-downtime Stripe migration — 99.9% uptime"  "Progressive loading: page load 12s → 2.3s")KNOWN_ALIASES=("daemon-os" "rubocop-hk" "ramadan-cli-pro")CURRENT_FOCUS="Platform Engineering & Technical Strategy"PHILOSOPHY="Building systems that scale, teams that deliver,            and solutions that last."echo "[STATUS] Dossier loaded. Target identified." 

// What I use

Tech Arsenal

🎨 Frontend

⚙️ Backend

🗃️ Databases

☁️ Cloud & DevOps

🧪 Testing

🤖 AI & Tools

// Where I've been

Professional Journey

Oct 2025 — Present

Senior Full Stack Engineer @ NexaQuanta

Full-time · Remote (London, UK)

Built CRM & product reporting module with email-based delivery for business intelligence
Designed & executed enterprise database schema migration achieving 100% parity
Built complete aftersales appointment lifecycle module — 60+ merged MRs
Integrated CitNOW video library eliminating cross-system context-switching
Architected CSV data import pipeline with batch optimization & duplicate detection
Implemented multi-dealer org scoping with dual-database architecture
Patched critical injection vulnerability; built generic audit module
Fixed Redis Cluster CROSSSLOT errors for stable BullMQ job processing

NestJSReactNext.jsMongoDBPostgreSQLAWSRedisBullMQ

Dec 2023 — Oct 2025

Staff Software Engineer @ TechXMation

Freelance · Lahore, Pakistan

Designed event-driven export system reducing wait times from 30+ min to under 5 min
Architected progressive loading cutting page load from 12s to 2.3s (70% improvement)
Built multi-level batch processing improving job success rate from 60% to 95%
Designed service mesh architecture eliminating 90% of data duplicates

RailsReactRedisSidekiqAWS S3PostgreSQL

Feb — Nov 2023

Application Developer @ Machine Tools

Full-time · Lahore, Pakistan

Implemented Sphinx Search improving response time by 300%
Built advanced filtering with role-based access — 85% faster data filtering
Architected scalable email delivery system improving delivery rate by 25%

RailsSphinx SearchArel SQLPostgreSQL

Jun 2022 — Jan 2023

Senior Software Engineer @ Freelance

Remote · Lahore, Pakistan

Designed HMAC-based API signature verification with JWT & rate limiting
Built reusable React component library reducing dev time by 40%
Architected unified multi-platform API integration layer

RailsReactGraphQLJWTChrome Extensions

2018 — 2022

Software Engineer @ Sendoso

Full-time · Lahore, Pakistan · 4 Years

Architected multi-API integration platform supporting 10+ APIs (Azure, Kolide, Kandji)
Led zero-downtime Stripe v2 → v3 migration with 99.9% uptime
Built real-time monitoring dashboard handling 1M+ requests/day
Designed event-driven CRM automation for Salesforce, HubSpot, Marketo
Built Chrome extension for CRM integration used by 1000+ sales reps
Implemented i18n system for email templates supporting 20+ languages

RailsReactReduxGraphQLStripeSalesforceNew RelicDDD

2017 — 2018