GitHub - hammadxcm/hammadxcm

🎯 About Me

const hammadKhan = {
    title: "Senior Full Stack Engineer",
    experience: "8+ years building systems at scale",
    location: "Lahore, Pakistan 🇵🇰",
    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", "NestJS", "NodeJS", "GraphQL", "High-Performance APIs"],
        frontend: ["ReactJS", "VueJS", "NextJS", "Progressive Web Apps"],
        infrastructure: ["AWS", "Azure", "Docker", "Redis", "BullMQ", "Kubernetes"],
        databases: ["PostgreSQL", "MongoDB", "MySQL", "Prisma ORM", "Data Modeling"],
        integrations: ["Multi-API Platforms", "CRM Systems", "Payment Gateways", "CitNOW"],
        security: ["OWASP Top 10", "Audit Systems", "Injection Prevention", "HIPAA"]
    },

    technicalLeadership: [
        "Delivered 115+ MRs in 5 months at NexaQuanta",
        "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: [
        "Enterprise appointment lifecycle with cross-module linking (60+ MRs)",
        "Multi-dealer org scoping with dual-database architecture",
        "CSV data import pipelines with batch optimization & duplicate detection",
        "Generic audit module for compliance and forensic traceability",
        "Real-time data processing pipelines with 95% job success rate",
        "Progressive loading systems reducing page load by 70%",
        "Zero-downtime Stripe API migration with 99.9% uptime"
    ],

    openSource: [
        "Rails Core Contributor — merged PR to rails/rails",
        "daemon-os — macOS MCP server for AI agent computer-use",
        "rubocop-hk — 2,800+ downloads on RubyGems",
        "ramadan-cli-pro — TUI dashboard with prayer times & i18n"
    ],

    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
_{⭐⭐⭐⭐⭐}

Rails
_{⭐⭐⭐⭐⭐}

ReactJS
_⭐⭐⭐⭐

VueJS
_⭐⭐⭐⭐

GraphQL
_{⭐⭐⭐⭐⭐}

NextJS
_⭐⭐⭐⭐

Python
_⭐⭐⭐

🚀 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:

📊 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

🗄️ 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

🗓️ Aftersales Appointments Management System

Challenge: No centralized appointment management for aftersales workflows — advisors had no way to create, track, or link appointments across HCI, Payment, and Triage modules
Solution: Built a complete appointment lifecycle module with multi-step creation forms, fly-out detail panels, status tags, advanced filtering/sorting, cross-module linking, and re-assignable "Assigned To" fields backed by SSO user lookup
Impact: Enabled full aftersales workflow management for dealer groups, appointment linking across HCI/Payment/Triage, real-time status tracking, and 60+ merged MRs delivering the feature end-to-end

📹 CitNOW Video Library & Status Integration

Challenge: No visibility into video status (Sales & Workshop) within the dealer portal — advisors had to switch between systems to track video progress
Solution: Built a dedicated video library page with filtering/sorting by status, CitNOW Sales and Workshop integration, NGD URL generation for direct video access, isolated filter state between Aftersales and Sales pages, and mobile-responsive design matching Figma specs
Impact: Unified video management across Sales and Aftersales in a single portal, eliminated context-switching between systems, real-time video status visibility for all advisors

📥 Enterprise Data Import Pipeline (IC5 → IC4)

Challenge: No mechanism to migrate legacy IC5 customer and appointment data into the new portal — manual entry was infeasible at scale
Solution: Built a full CSV-based data import pipeline with upload UI, server-side validation, duplicate detection (email uniqueness enforcement), appointment status mapping, import summary with invalid/valid record breakdown, and performance-optimized batch processing
Impact: Enabled seamless migration of enterprise customer and appointment datasets, prevented duplicate records with global uniqueness enforcement, reduced import processing time significantly with batch optimization

🏢 Multi-Dealer Org Scoping & Dual-Database Architecture

Challenge: Portal lacked proper dealer/org scoping — queries returned data across all organizations without isolation, creating data leakage risk in multi-dealer environments
Solution: Integrated orgId throughout the portal with comprehensive dealer scoping for all IC4/IC5 lookup queries, dual-database querying strategy for cross-system appointment resolution, and dealer hierarchy tracking
Impact: Proper data isolation per dealer organization, eliminated cross-org data leakage, established foundation for scalable multi-tenant dealer group management

🔒 Security Hardening & Generic Audit Module

Challenge: Critical query injection vulnerability identified by Aikido security scan in the presenter service; no audit trail for user actions across the platform
Solution: Patched the injection vulnerability in the presenter microservice; architected and implemented a generic audit module with activity tracking refactor, reusable across all platform entities
Impact: Eliminated critical security vulnerability (CVE-level), established comprehensive audit trail for compliance and forensic traceability across all user actions

⚙️ Redis Cluster & Infrastructure Hardening

Challenge: Redis Cluster CROSSSLOT errors crashing BullMQ job queues; optional auth not handled
Solution: Fixed CROSSSLOT key violations for BullMQ sso-import queue, added graceful Redis authentication handling
Impact: Stable job processing in clustered Redis environments, zero queue failures from infrastructure misconfig

Technologies: Microservices NestJS Node.js React.js Next.js MongoDB PostgreSQL Prisma ORM AWS Amazon EC2 Amazon S3 Redis BullMQ 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}

🌟 Open Source & Community

🌙 ramadan-cli-pro _{Published npm package — TUI dashboard with prayer times, i18n & notifications 5 stars · 438+ downloads}	💎 rubocop-hk _{Published RubyGem — Modern RuboCop config for Ruby & Rails 6 stars · 3.5k+ downloads}	🔍 image-magnifier _{React zoom component — TypeScript with 7 releases 8 stars · 775+ downloads}
⚡ electric-border-css _{Animated CSS border effects — React, Vue, Next.js & Svelte with live demo 4 stars · 307+ downloads}	🖥️ daemon-os _{macOS MCP server for AI agent computer-use — gives AI eyes & hands on your Mac 2 stars}	🚀 hammadxcm _{This portfolio — Astro, TypeScript, SCSS 10 themes, glass UI, dynamic data 8 stars}
💀 slay _{Published npm package — Zero-dep CLI to kill processes by port 5 stars · 1.2k+ downloads}

Merged PRs to Notable Projects

Repository	PR	Status	Date	Stars	Impact
rubocop/rubocop	[Fix #15135] Fix `Style/RedundantParentheses` autocorrect swallowing chained methods into trailing comments	🟢 Open	May 1, 2026	12.9k	+77 -2
rubocop/rubocop	[Fix #14821] Fix `Style/IfInsideElse` autocorrect moving comments into wrong branch	🟣 Merged	Apr 28, 2026	12.9k	+45 -2
vercel/next.js	fix(i18n): use correct defaultLocale when domains array is present on default host	🟢 Open	Apr 23, 2026	139.3k	+38 -3
rails/rails	Fix config.credentials.key_path set in environment files being ignored	🟢 Open	Apr 23, 2026	58.4k	+27 -0
rails/rails	Fix attachment uploads lost when reload is called inside a transaction	🟢 Open	Apr 23, 2026	58.4k	+57 -1
rails/rails	Fix method_missing performance regression for virtual SELECT alias attributes	🟢 Open	Apr 22, 2026	58.4k	+26 -3
rubocop/rubocop	[Fix #15122] Fix false positive in `Layout/MultilineMethodCallIndentation`	🟢 Open	Apr 22, 2026	12.9k	+47 -2
rubocop/rubocop	[Fix #15117] Add `AllowConsecutiveConditionals` option to `Style/IfUnlessModifier`	🟢 Open	Apr 19, 2026	12.9k	+150 -1
keycloak/keycloak	Migrate Organization Partial Export test into new testsuite	🟢 Open	Apr 17, 2026	34.2k	+57 -25
rails/rails	Document that days_in_month and days_in_year assume proleptic Gregorian calendar	🟢 Open	Apr 1, 2026	58.4k	+9 -0
thoughtbot/factory_bot	Add `factory_bot.before_run_factory` instrumentation event	🟣 Merged	Mar 27, 2026	8.2k	+133 -0
rails/rails	Add test coverage for Error#initialize_dup, #hash, and #detail	🟣 Merged	Mar 27, 2026	58.4k	+29 -0
rails/rails	Add test coverage for ActiveModel::Errors#import	🟣 Merged	Mar 27, 2026	58.4k	+41 -0
rails/rails	Add test coverage for NestedError#inner_error, #raw_type, and #options	🟣 Merged	Mar 27, 2026	58.4k	+27 -0
rails/rails	Add test coverage for Errors#to_hash with full_messages and #uniq!	🟣 Merged	Mar 27, 2026	58.4k	+17 -0
rails/rails	Add test coverage for Errors#delete with type and options	🟣 Merged	Mar 27, 2026	58.4k	+30 -0
rails/rails	Add test coverage for ActiveModel::Error#strict_match?	🟣 Merged	Mar 27, 2026	58.4k	+44 -0
rails/rails	Add test coverage for EnvironmentInquirer predicates	🟣 Merged	Mar 27, 2026	58.4k	+30 -0
novuhq/novu	fix(js): bundle Solid ecosystem deps to prevent React is not defined error	🟣 Merged	Mar 25, 2026	38.9k	+129 -17
rubocop/rubocop	[Fix #15042] Add `DisallowedCops` option to `Style/DisableCopsWithinSourceCodeDirective`	🟢 Open	Mar 23, 2026	12.9k	+123 -3
rails/rails	Fix association build to set inverse before assigning attributes	🟢 Open	Mar 23, 2026	58.4k	+22 -3
rails/rails	Add test coverage for ActiveModel::Errors#where	🟣 Merged	Mar 23, 2026	58.4k	+59 -0
rails/rails	Add test coverage for IsolatedExecutionState#key?, #delete, and #context	🟣 Merged	Mar 23, 2026	58.4k	+36 -0

📈 Impact Metrics

📊 Analytics Dashboard

🔥 Streak & Activity

📈 Contribution Metrics

🎯 Skills & Activity Breakdown

Notable OSS Contributions

🏆 Achievement Gallery

📊 Comprehensive Analytics Hub

🔍 Profile Overview

💻 Language & Repository Distribution

📁 Repositories by Language

🎯 Commits by Language

⚡ Performance & Productivity Insights

📈 Overall Statistics

🕒 Peak Coding Hours

📈 Activity Graph

🔝 Top Contributions

🐍 Contribution Snake

🧊 3D Contribution Graph

📊 Quick Stats Summary

👁️ Profile Views

counting of visitors to this page in this section started from April 15, 2025

⭐ Star History

🧩 LeetCode Stats

📈 Problem Solving & Contest Rating

📚 Stack Overflow Stats

💻 HackerRank

🏆 Certifications & Learning

💡 Random Dev Quote

Want to use this portfolio as a template? Check out the Template Setup Guide — fork, configure, and deploy in under 5 minutes.

Name		Name	Last commit message	Last commit date
Latest commit History 1,032 Commits
.github/workflows		.github/workflows
.husky		.husky
assets		assets
generated		generated
public		public
scripts		scripts
src		src
workers		workers
.gitignore		.gitignore
.nojekyll		.nojekyll
.nvmrc		.nvmrc
CHANGELOG.md		CHANGELOG.md
CICD.md		CICD.md
CONTRIBUTING.md		CONTRIBUTING.md
RANDOM.md		RANDOM.md
README.md		README.md
TEMPLATE_GUIDE.md		TEMPLATE_GUIDE.md
astro.config.mjs		astro.config.mjs
biome.json		biome.json
daily_char_commits.sh		daily_char_commits.sh
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json
vercel.json		vercel.json
vitest.config.ts		vitest.config.ts

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🎯 About Me

🛠️ Professional Tech Arsenal

🎯 Core Expertise

🚀 Frontend Development

⚙️ Backend & APIs

🗄️ Databases & Storage

☁️ Cloud & DevOps

🧪 Testing & Quality

🤖 AI & Modern Tools

🔧 Additional Languages & Tools

💻 IDEs & Development Environment

💼 Professional Journey & Achievements

🎯 Current Role

🏢 Professional Experience & System Architecture

🚀 Senior Full Stack Engineer @ NexaQuanta

🚀 Staff Software Engineer @ TechXMation

🔧 Application Developer @ Machine Tools

💻 Senior Software Engineer @ Freelance

🚀 Software Engineer @ Sendoso

⚡ Software Engineer @ Engin Technologies

🚀 Recent Achievements

🌟 Open Source & Community

Merged PRs to Notable Projects

📈 Impact Metrics

📊 Analytics Dashboard

🔥 Streak & Activity

📈 Contribution Metrics

🎯 Skills & Activity Breakdown

Notable OSS Contributions

🏆 Achievement Gallery

📊 Comprehensive Analytics Hub

🔍 Profile Overview

💻 Language & Repository Distribution

⚡ Performance & Productivity Insights

📈 Activity Graph

🔝 Top Contributions

🐍 Contribution Snake

🧊 3D Contribution Graph

📊 Quick Stats Summary

👁️ Profile Views

⭐ Star History

🧩 LeetCode Stats

📈 Problem Solving & Contest Rating

📚 Stack Overflow Stats

💻 HackerRank

🏆 Certifications & Learning

🔒 Security & Compliance

🌐 Networking & Infrastructure

🛤️ Web Frameworks & Testing

💻 Languages & Tools

🐍 Python & Data Science

🤖 AI & Automation

💡 Random Dev Quote

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