Senior Java Developer API & Cloud Services

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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