Senior Java Developer API & Cloud Services

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