Backend Engineer with 4+ years of experience building, scaling, and maintaining production-grade software systems.

I specialize in backend development, API design, asynchronous processing, database optimization, and building reliable cloud-native applications. My experience spans both the Java/Spring ecosystem and Ruby on Rails, with a strong focus on performance, maintainability, and system reliability.

• ☕ Building backend services with Java & Spring Boot
• 💎 Experienced in Ruby on Rails
• 🔐 Working with Spring Security & JWT Authentication
• 📡 Exploring event-driven systems with Apache Kafka
• 🗄️ Optimizing PostgreSQL, AWS Aurora & database queries
• ⚡ Building asynchronous and background processing workflows
• ☁️ Working with AWS, Docker, ECS & Fargate
• 📊 Improving observability with Prometheus, Grafana, CloudWatch & Sentry
• 🧠 Continuously learning System Design, Distributed Systems & Cloud-Native Architecture

• 🏗️ Designing scalable backend services and REST APIs
• ☕ Building production applications with Java and Spring Boot
• 📡 Learning and implementing event-driven architecture with Apache Kafka
• 🔄 Designing asynchronous processing and background job workflows
• 🗄️ Improving database design, indexing, and query performance
• ☁️ Building cloud-native applications on AWS
• 📊 Implementing monitoring, logging, and observability practices
• 🧪 Writing reliable automated tests and improving software quality
• 🚀 Deepening my knowledge of distributed systems and system design

Spring Core • Spring MVC • Spring Data JPA • Hibernate • Spring Security • JWT Authentication • RESTful API Design • Asynchronous Processing • Background Jobs

Database Design • Data Modeling • Query Optimization • Redis Caching • Event-Driven Architecture

EC2 • ECS • Fargate • S3 • Lambda • CloudWatch • AWS Aurora

Docker Compose • CI/CD Pipelines • Cloud-Native Development

JUnit • Mockito • API Testing • Swagger/OpenAPI • Prometheus • Grafana • Sentry • CloudWatch

📍 Islamabad, Pakistan | 🗓️ Dec 2022 – Present

• Built and maintained scalable backend systems for a financial platform handling sensitive legal and financial data
• Designed and optimized REST APIs for high-volume external integrations
• Architected data import and processing pipelines for large datasets
• Worked with asynchronous processing and background job workflows
• Optimized PostgreSQL queries and improved database performance
• Contributed to AWS Aurora migration and infrastructure improvements
• Participated in backend architecture and system design decisions
• Investigated and resolved production issues to improve system reliability
• Focused on performance optimization, maintainability, and production stability

📍 Islamabad, Pakistan | 🗓️ Mar 2022 – Jul 2022

• Developed backend features using Ruby on Rails
• Built RESTful APIs and worked with MVC architecture
• Designed PostgreSQL schemas with a focus on data integrity
• Deployed and maintained applications using Heroku
• Worked in collaborative Git-based development workflows
• Participated in code reviews and Agile development processes

Code Reviews • Agile / Scrum Development • Production Troubleshooting • Performance Optimization • Monitoring • Cloud-Native Development • API Design • System Design

• 🎓 BS Computer Engineering — Air University
• ☁️ AWS Cloud Technical Essentials
• ⚙️ DevOps on AWS: Code, Build, and Test
• 🐍 Programming for Everybody (Python)
• 🔧 Introduction to Git and GitHub

I'm open to:

• 💼 Backend Engineering Opportunities
• ☕ Java & Spring Boot Projects
• 💎 Ruby on Rails Projects
• ☁️ Cloud-Native Applications
• 📡 Event-Driven Systems
• 🧠 Backend Architecture & System Design
• 🚀 SaaS and Product Development

📬 Reach out: khalil.ahmad1547@gmail.com

Java + Spring Boot
        ↓
Microservices & Distributed Systems
        ↓
Apache Kafka & Event-Driven Architecture
        ↓
AWS Cloud-Native Systems
        ↓
Observability & Production Reliability
        ↓
Building Scalable, High-Performance Systems 🚀