Senior Java Developer (Kafka + AWS)

MAS Global Consulting; New York (NY); On-site; USD 120,000 - 160,000; Full time

Job summary

A technology consulting firm is seeking a skilled Senior Backend Developer to design and build robust backend systems using Java, Apache Kafka, and AWS. In this full-time, on-site position, you will work with cross-functional teams to deliver impactful solutions. Candidates should have extensive backend development experience and strong expertise in designing distributed systems. This role involves mentoring other engineers and optimizing backend application performance.

Qualifications

• 8+ years of professional experience in backend software development.
• Solid understanding of distributed systems and event-driven architecture.
• Core proficiency in Java (Java 11+) and OOP principles.

Responsibilities

• Design, develop, and maintain high-performance backend services.
• Architect and implement event-driven solutions using Apache Kafka.
• Deploy and manage cloud infrastructure on AWS.

Skills

Java

Apache Kafka

AWS

Problem-solving

Communication

Education

Bachelor's degree in Computer Science or related field

Tools

Git

Spring Boot

Docker

Kubernetes

Job description

Senior Backend Developer

We are looking for a strong Senior Backend Developer to join our growing engineering team. In this full‑time, on‑site role, you will design and build robust, scalable backend systems leveraging Java, Apache Kafka, and AWS. You will collaborate closely with cross‑functional teams to deliver high‑impact solutions for enterprise clients.

Type: Full-Time, On-Site

What You’ll Do

• Design, develop, and maintain high-performance backend services and distributed systems using Java.
• Architect and implement event-driven solutions using Apache Kafka, ensuring reliability, scalability, and low latency.
• Deploy, configure, and manage cloud infrastructure and services on AWS (e.g., EC2, ECS, Lambda, S3, RDS, SQS).
• Collaborate with stakeholders to gather requirements and translate them into scalable technical solutions.
• Develop and optimize RESTful APIs and backend application functionalities for high performance and responsiveness.
• Write and maintain automated tests (unit, integration, E2E) and ensure code quality through code reviews.
• Apply security best practices, including authentication and authorization mechanisms, to protect backend systems.
• Troubleshoot and resolve production issues, ensuring minimal downtime and operational stability.
• Mentor junior and mid-level engineers, promoting engineering best practices and a culture of continuous improvement.
• Collaborate with front-end, DevOps, and QA teams to ensure seamless integration and delivery of solutions.

What You Bring

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• 8+ years of professional experience in backend software development.
• Solid understanding of distributed systems, event-driven architecture, and messaging patterns.
• Experience with version control systems (e.g., Git) and agile development methodologies.
• Strong problem-solving skills and a track record of resolving complex production issues.
• Excellent communication skills and ability to work effectively in cross-functional teams.
• Candidates must demonstrate strong, hands-on expertise in all three of the following:

Java

Core language proficiency (Java 11+), OOP, design patterns, multithreading, and performance optimization.

Apache Kafka

Event-driven architecture, producer/consumer configuration, topic partitioning, schema registry, and Kafka Streams or similar.

Amazon Web Services (AWS)

Cloud infrastructure design and operations, including EC2, ECS, Lambda, S3, RDS, SQS, and strong JVM internals and concurrency knowledge.

Nice to Have

• Spring Boot & Microservices: Experience building and deploying production-grade microservices using Spring Boot, Spring Cloud, and related frameworks (Eureka, API Gateway, Circuit Breaker).
• Containerization & Orchestration: Familiarity with Docker and Kubernetes (EKS or similar).
• Observability: Experience with monitoring and tracing tools.
• CI/CD: Experience with Jenkins, GitHub Actions, or similar pipelines for automated testing and deployment.