Full Stack Java Developer (Wilmington, DE)

MAS Global Consulting; Wilmington (DE); On-site; USD 100,000 - 130,000; Full time

Job summary

MAS Global Consulting is seeking a Senior Java Full Stack Developer for an on-site, full-time position in Wilmington, Delaware. You will design and build scalable backend systems using Java and AWS, collaborating closely with cross-functional teams to deliver high-impact solutions.

The ideal candidate has over 8 years of experience in backend development, strong expertise in Java and AWS, and familiarity with frontend technologies like React or Angular. The role emphasizes best practices in code quality, security, and operational stability.

Qualifications

• 8+ years of professional experience in backend software development.
• Solid understanding of distributed systems and event-driven architecture.
• Strong problem-solving skills with complex production issues.

Responsibilities

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

Skills

Java

AWS

Apache Kafka

React

Agile methodologies

Education

Bachelor's degree in Computer Science or related field

Tools

Git

Docker

Kubernetes

Job description

Senior Java Full Stack Developer – Full‑Time, On‑Site

We are looking for a Senior Java Full Stack 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.

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.

Demonstrate strong, hands‑on expertise in the following core areas:

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

Amazon Web Services (AWS): Cloud infrastructure design and operations, including EC2, ECS, Lambda, S3, RDS, SQS, and strong JVM internals and concurrency knowledge.

Front‑end Exposure: Hands‑on experience with React or Angular, contributing to full‑stack development and integration with backend services.

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).
• Apache Kafka: Event‑driven architecture, producer/consumer configuration, topic partitioning, schema registry, and Kafka Streams or similar.
• 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.