Senior Java AWS API/Web Services Developer

Job Summary

We are seeking a highly experienced Senior Java AWS API/Web Services Developer to design, build, and optimize high-performance, scalable applications handling very high transaction volumes (3000+ TPS).

The ideal candidate will bring deep expertise in multithreading, performance tuning, and distributed systems, with prior experience in eCommerce platforms, payment gateways, or other high-throughput environments.

This role requires an end-to-end product mindset, covering design, development, testing, deployment, and production optimization.

Key Responsibilities

• Design and develop high-performance, scalable applications using Core Java and J2EE
• Build and maintain RESTful APIs and microservices architectures
• Handle and optimize systems processing 3000+ TPS (transactions per second)
• Perform Java thread management, concurrency handling, and memory optimization
• Analyze and troubleshoot performance issues using heap dumps, thread dumps, and profiling tools
• Develop cloud-native applications leveraging AWS services
• Collaborate across teams to ensure end-to-end product delivery
• Implement CI/CD pipelines and maintain high code quality standards
• Participate in code reviews, system design discussions, and architecture decisions

Required Qualifications

• 8+ years of hands-on experience in Java development
• Strong expertise in:
  • Core Java, J2EE, and design patterns
  • Multithreading and concurrency
  • High TPS system design and performance tuning
• Proven experience with:
  • API/Web Services development
  • Microservices architecture
• Hands-on experience with AWS cloud services, including:
  • EKS, S3, IAM, Route 53, ELB
  • DynamoDB, Amazon Aurora PostgreSQL
  • SNS, SQS, MSK (Kafka), CloudWatch
• Experience working with high-volume systems (preferably 3000+ TPS)

Preferred Qualifications

• Experience in eCommerce or Payment Gateway systems
• Familiarity with Kafka and Kubernetes
• Frontend experience with React or Angular
• Experience with:
  • CI/CD tools (Jenkins)
  • Unit testing frameworks (JUnit, Mockito)
  • Version control (Git)
  • Agile methodologies and Jira
• Experience with SQL and NoSQL databases

Key Skills

• Application Performance Optimization
• Heap Dump & Thread Dump Analysis
• Distributed Systems Design
• Cloud-Native Development (AWS)
• Microservices & API Architecture
• High Availability & Scalability

What We re Looking For

• Strong problem-solving mindset with a focus on performance and scalability
• Ability to work in high-pressure, high-throughput environments
• Ownership mentality with end-to-end delivery experience
• Excellent communication and collaboration skills