Hammad Khan hammadxcm

🎯 About Me

const hammadKhan = {
    title: "Senior Full Stack Engineer",
    experience: "6+ years building systems at scale",
    location: "Lahore, Pakistan 🇵🇰",
    age: 32,
    specialization: "Distributed Systems & Platform Architecture",
    currentRole: "Senior Full Stack Engineer @ NexaQuanta",
    workStyle: "Technical Leadership & Full-stack Development",
    
    expertise: {
        systemDesign: ["Microservices", "Event-Driven Architecture", "Domain-Driven Design"],
        backend: ["Ruby on Rails", "NodeJS", "GraphQL", "High-Performance APIs"],
        frontend: ["ReactJS", "VueJS", "NextJS", "Progressive Web Apps"],
        infrastructure: ["AWS", "Azure", "Docker", "Redis", "Message Queues"],
        databases: ["PostgreSQL", "MongoDB", "Query Optimization", "Data Modeling"],
        integrations: ["Multi-API Platforms", "CRM Systems", "Payment Gateways"]
    },
    
    technicalLeadership: [
        "Designed fault-tolerant systems handling millions of requests",
        "Led migration of monolithic apps to microservices architecture",
        "Mentored engineering teams on system design and best practices",
        "Established engineering standards and code review processes"
    ],
    
    systemsBuilt: [
        "Real-time data processing pipelines with 95% job success rate",
        "Progressive loading systems reducing page load by 70%",
        "Multi-tenant SaaS platforms serving enterprise clients",
        "Zero-downtime deployment strategies for critical systems"
    ],
    
    currentFocus: "Platform Engineering & Technical Strategy",
    openTo: ["Staff/Principal Engineering Roles", "Architecture Consulting", "Team Leadership"],
    philosophy: "Building systems that scale, teams that deliver, and solutions that last 🚀"
};

🛠️ Professional Tech Arsenal

🎯 Core Expertise

Ruby
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Rails
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ReactJS
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VueJS
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GraphQL
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NextJS
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Python
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🚀 Frontend Development

_JavaScript	_TypeScript	_HTML5	_CSS3	_Tailwind	_SASS	_Redux	_{Chrome Ext}
_Webpack	_Gatsby	_Storybook

⚙️ Backend & APIs

_NodeJS	_GraphQL	_Salesforce	_HubSpot	_Stripe	_Marketo
_{REST API}	_Django	_Java	_Nginx

🗄️ Databases & Storage

_PostgreSQL

_MongoDB

_MySQL

_Redis

_SQLite

☁️ Cloud & DevOps

_AWS	_Azure	_Git	_GitHub	_S3/EC2	_Sidekiq	_Docker	_Heroku
_Kubernetes

🧪 Testing & Quality

_RSpec	_FactoryBot	_Shoulda	_{Vue Test Utils}	_Vitest	_Jest
_ESLint	_Prettier	_{Testing Lib}

🤖 AI & Modern Tools

_ChatGPT

_{Claude AI}

_{GitHub Copilot}

_Midjourney

🔧 Additional Languages & Tools

_C++

_C#

_Swift

_ReScript

_{Raspberry Pi}

_{REST API}

_Docker

_GitHub

💻 IDEs & Development Environment

_{VS Code}

_IntelliJ

_WebStorm

_RubyMine

_PyCharm

_PhpStorm

_RustRover

💼 Professional Journey & Achievements

🎯 Current Role

_{Since October 2025 • Remote (London, UK)}

🏢 Professional Experience & System Architecture

🚀 Senior Full Stack Engineer @ NexaQuanta

Full-time • Remote (London, UK)

Full-Stack Development & Platform Engineering:

🐳 Docker-Based Development Environment

Challenge: Slow developer onboarding and environment inconsistency across team
Solution: Implemented containerized development environment with hot reload for frontend and backend services
Impact: 80% faster developer onboarding, zero environment inconsistency, streamlined single command setup

📸 Profile Image Upload with Transaction Safety

Challenge: Backend bottleneck for image uploads with no rollback mechanism on failures
Solution: Architected frontend-based direct S3 upload with transaction-safe operations and automatic rollback
Impact: 40-50% faster uploads, eliminated orphaned images, improved system reliability

📊 CRM & Product Reporting System

Challenge: Lack of centralized reporting capability for business intelligence
Solution: Built comprehensive reporting module with email-based delivery supporting CRM and Product analytics
Impact: Enabled self-service reporting for sales and operations teams, improved business visibility into customer interactions and pipeline metrics

🎬 Advanced Multi-Select Filter System

Challenge: Limited filtering capabilities restricting users from performing complex searches
Solution: Engineered multi-select filter system with optimized query generation and SQL injection prevention
Impact: Enhanced search efficiency, reduced time to find relevant content, scalable architecture for future filter additions

🗄️ Enterprise Database Schema Migration

Challenge: Incomplete database schema limiting cross-system data integration
Solution: Designed and executed complete database schema migration achieving 100% parity with source system
Impact: Enabled complete dealer hierarchy tracking, unified data management, established foundation for real-time synchronization and business intelligence

Technologies: Microservices NestJS Node.js React.js Next.js MongoDB PostgreSQL Prisma ORM AWS Amazon EC2 Amazon S3 API Development Jest Vitest

🚀 Staff Software Engineer @ TechXMation

Freelance • Lahore, Pakistan

System Design & Architecture Leadership:

🏗️ Distributed Data Processing Architecture

Challenge: Time-consuming manual data exports causing operational bottlenecks
Solution: Designed and implemented event-driven export system with real-time progress tracking
Architecture: Built pub/sub mechanism using Redis streams with job queuing system
Impact: Reduced export wait times from 30+ minutes to under 5 minutes for large datasets

⚡ Progressive Loading System Design

Challenge: Database queries causing 10+ second page load times
Solution: Architected progressive data loading with ReactJS and asynchronous rendering
Technical Approach: Implemented lazy loading with pagination, caching layer using Redis
Impact: Reduced initial page load from 12s to 2.3s, improved user engagement by 70%

🔄 Multi-Level Job Processing Architecture

Challenge: Sidekiq job failures, memory overflow, and deployment interruptions
Solution: Designed complex multi-level batch processing with callback mechanisms
Technical Implementation: Created job monitoring system with retry logic and error handling
Impact: Improved job success rate from 60% to 95%, reduced memory usage by 40%

🌉 Microservices Integration & Data Flow

Challenge: Poor communication between Pretzel and Fawkes systems causing data inconsistency
Solution: Designed service mesh architecture with message queuing and event sourcing
Implementation: Built central data mapping service for YouTube/TikTok data with comprehensive API documentation
Result: Eliminated 90% of data duplicates, improved system reliability

Technologies: Ruby on Rails ReactJS Redis Sidekiq AWS S3 PostgreSQL Microservices Event-Driven Architecture

🔧 Application Developer @ Machine Tools

Full-time • Lahore, Pakistan

Database Architecture & Performance Engineering:

🔍 Search Engine Optimization

Challenge: Slow database queries affecting user experience
Solution: Implemented Sphinx Search with optimized indexing strategy
Technical Approach: Designed full-text search with Arel SQL for complex query optimization
Impact: Improved search response time by 300%, enhanced data retrieval efficiency

📊 Advanced Data Filtering System

Technical Implementation: Built sophisticated filtering mechanism with role-based access control
Architecture: Designed permission system with hierarchical user roles and content visibility
Performance: Optimized SQL queries resulting in 85% faster data filtering

🎛️ Email Delivery System Enhancement

System Design: Architected scalable email delivery system with formatting improvements
Technical Features: Implemented template system with user engagement tracking
Result: Improved email delivery rate by 25% and user engagement metrics

Technologies: Ruby on Rails Sphinx Search Arel SQL PostgreSQL Role-Based Access Control

💻 Senior Software Engineer @ Freelance

Remote • Lahore, Pakistan

Security Architecture & API Design:

🔐 API Security Framework

Challenge: Ensure integrity and authenticity of API communications
Solution: Designed robust API signature verification system
Implementation: Built HMAC-based authentication with JWT tokens and rate limiting
Security Features: Implemented request signing, timestamp validation, and replay attack prevention

🏗️ Component-Based Architecture

Technical Approach: Designed reusable ReactJS components with maintainable architecture
System Design: Created modular component library with proper state management
Impact: Reduced development time by 40% through component reusability

🔄 Multi-Platform API Integration

Architecture: Built unified API integration layer supporting multiple third-party services
Technologies: Designed adapter pattern for seamless API switching and error handling
Result: Streamlined integration process across different platforms

Technologies: Ruby on Rails ReactJS GraphQL API Security Chrome Extensions JWT Authentication

🚀 Software Engineer @ Sendoso

Full-time • Lahore, Pakistan • 4 Years

Enterprise-Scale System Architecture & Platform Engineering:

🏛️ Multi-API Integration Platform

System Design: Architected unified integration platform supporting 10+ APIs (Kolide, Microsoft Azure, Kandji, Render, Secure Frame)
Technical Challenge: Designed fault-tolerant API gateway with circuit breakers and retry mechanisms
Architecture Pattern: Implemented adapter pattern for seamless API integration with centralized error handling
Impact: Reduced integration time from weeks to days for new APIs

💳 Payment System Migration Architecture

Challenge: Migrate from Stripe API v2 to v3 without downtime
Solution: Designed blue-green deployment strategy with feature flags
Technical Implementation: Built backward-compatible payment layer with gradual rollout
Result: Zero-downtime migration with 99.9% uptime during transition

📊 Real-Time Monitoring & Analytics Platform

System Design: Architected comprehensive API logging dashboard with real-time metrics
Technical Stack: Built with Prometheus Ruby client, integrated with New Relic for advanced monitoring
Data Pipeline: Designed log aggregation system handling 1M+ requests/day
Migration: Successfully migrated to New Relic with improved monitoring capabilities

🔄 CRM Integration & Automation Platform

Architecture: Designed event-driven automation system for Salesforce-Sendoso synchronization
Technical Implementation: Built pub/sub messaging system with dead letter queues
Integration Scope: Connected HubSpot, Salesloft, Marketo, and Engagio platforms
Performance: Achieved 60% increase in operational efficiency through automation

🎛️ Admin Platform & Role Management System

System Design: Architected role-based access control with granular permissions
Technical Features: Built hierarchical permission system with audit logging
Security: Implemented secure admin panel with multi-factor authentication
User Management: Designed scalable user role system supporting enterprise clients

🌐 Browser Extension Architecture

Technical Challenge: Build performant Chrome extension for CRM integration
Solution: Designed lightweight extension with background script architecture
Performance: Optimized for minimal memory footprint and fast loading
Integration: Seamless data sync between HubSpot, Salesloft, and Sendoso platforms

📈 Customer Analytics & Retention Platform

Integration: Implemented ChurnZero for customer behavior analysis
Data Pipeline: Built real-time analytics pipeline for customer insights
Actionable Intelligence: Designed alerting system for customer retention teams
Impact: Improved customer retention through data-driven insights

🏗️ Microservices Architecture & Documentation

System Design: Contributed to notification microservice using Domain-Driven Design principles
Architecture: Designed event-sourced notification system with message queuing
Documentation: Created comprehensive API documentation and integration guides
Scalability: Built for high-throughput notification delivery

🌍 Internationalization & Global Scale

Challenge: Enable global expansion with multi-language support
Solution: Designed i18n system for email templates with 20+ languages
Architecture: Built localization pipeline with translation management
Impact: Enabled Sendoso's expansion to international markets

Technologies: Ruby on Rails ReactJS Redux GraphQL Chrome Extensions Salesforce API HubSpot API Marketo API Stripe API New Relic Prometheus ChurnZero Domain-Driven Design Event-Driven Architecture Microservices

⚡ Software Engineer @ Engin Technologies

Full-time • Lahore, Pakistan

Full-Stack Development & E-commerce Architecture:

🛒 E-commerce Platform Architecture

Technical Implementation: Built scalable e-commerce solutions using Spree Commerce framework
System Design: Designed product catalog and order management system
Integration: Connected payment gateways and inventory management systems
Performance: Optimized for high-traffic e-commerce operations

🎯 Frontend Architecture with State Management

Technical Approach: Implemented ReactJS with Redux for complex state management
Architecture: Designed component-based frontend with efficient data flow
Integration: Built seamless frontend-backend communication with Rails & GraphQL
User Experience: Created responsive and interactive user interfaces

Technologies: Ruby on Rails ReactJS ReduxJS GraphQL AngularJS Spree Commerce E-commerce Architecture

🚀 Recent Achievements

🚀 Sidekiq Optimization _{Implemented multi-level batch processing Reduced job failures by 95%}	📊 Progressive Web Apps _{Built async loading pages Reduced load times by 70%}	🔄 CRM Automation _{Automated Salesforce-Sendoso sync Increased efficiency by 60%}
💳 Payment Systems _{Upgraded Stripe API v2 → v3 Zero downtime migration}	🎯 Browser Extensions _{Built CRM integration tools Used by 1000+ sales reps}	☁️ Scalable Storage _{Implemented S3 data solutions Handling TB-scale data}