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Freelance Java Backend Developer Jobs in Delaware

Judge Group, Inc.

FullStack Java Developer

Wilmington, DE · On-site

$51 - $65.75/hr

About the Role We are seeking a Full Stack Java Developer with strong backend expertise and hands-on frontend development experience to help design, build, and maintain scalable enterprise ...

New

Saransh Inc

Android Developer - Onsite

Wilmington, DE · On-site

$54 - $71/hr

Work with backend engineers to integrate mobile applications with backend services. * Troubleshoot ... Strong proficiency in Kotlin and Java programming languages. * Solid understanding of Android SDK ...

Spruce Infotech Inc

Sr. Java Developer

Wilmington, DE

$55.50 - $70.75/hr

Provide expert knowledge and guidance for acquisition related backend Java and/or frontend Web features. Ensure that the development teams are adhering to the client SDLC process. Provide technical ...

Rantz Marketing

Local automotive-focused start-up is seeking freelance web designer/developer/engineer who can use ... Must be well versed in HTML, with a base understanding of PHP, Java, Photoshop and CSS. Experience ...

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Full Stack Java Developer (Wilmington, DE)

MAS Global Consulting

Wilmington, DE • On-site

$100 - $130/hr

Other

Posted yesterday

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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.
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