hammadxcm - Overview

🚀 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