Engineering Portfolio

Real-world backend systems, API designs, and infrastructure projects with measurable impact

CodeIgniter 4 + MySQL 2023

High-Traffic E-commerce Backend

Built a scalable REST API for an online marketplace handling 50,000+ daily transactions. Implemented JWT authentication, Redis caching, and optimized database queries.

Technical Challenges Solved:
  • Reduced API response time from 1200ms to 320ms
  • Implemented real-time inventory synchronization
  • Designed rate limiting to prevent API abuse
Tech Stack:
PHP 8.2 CodeIgniter 4 MySQL 8.0 Redis Docker AWS EC2
65% Performance Gain
Python + Apache Airflow 2024

Real-time Data Processing Pipeline

Designed and deployed an ETL pipeline processing 2M+ records daily for a fintech startup. Automated data validation, transformation, and loading to data warehouse.

Key Achievements:
  • Reduced manual processing time by 40 hours/week
  • Implemented data quality checks and alerting
  • Achieved 99.95% data accuracy rate
Tech Stack:
Python 3.10 Apache Airflow PostgreSQL Docker AWS S3 Great Expectations
Real-time Processing
AWS + Docker + CI/CD 2023

Legacy System Migration to Cloud

Led migration of monolithic PHP application from on-prem servers to AWS with zero downtime. Implemented containerization, CI/CD pipeline, and monitoring.

Migration Results:
  • 35% reduction in hosting costs
  • Zero downtime during migration
  • Deployment time reduced from 2 hours to 8 minutes
Tech Stack:
AWS (EC2, RDS, S3) Docker GitHub Actions Terraform Nginx Prometheus
35% Cost Savings
Custom PHP CMS 2022

Custom Content Management System

Built a lightweight CMS for media companies with custom permissions, workflow management, and real-time collaboration features. Serves 50+ internal users.

Features Built:
  • Role-based access control with 12 permission levels
  • Real-time collaborative editing
  • Automated backup and versioning system
Tech Stack:
PHP 8.1 CodeIgniter 4 MySQL WebSockets jQuery Bootstrap 5
50+ Daily Users
Note: Some projects are under NDA. Contact me for detailed case studies and code samples.