Top Senior Java Developer Jobs

Senior Java Developer for a long-term (min 6 months) contract in Herndon, VA. Must have 8+ years' experience building Java applications using Core Java and Spring MVC, plus frontend skills (JavaScript, jQuery, Bootstrap, HTML5). Requires UI design sensibility and experience in financial engineering.

Senior Java developer with strong J2EE expertise (8+ years). Work on distributed systems, designing messaging and clustering solutions. Employer will provide initial training on Big Data and Hadoop.

Design, develop, test, and implement web-based Java applications using Spring and Tomcat. Create design documents, debug and resolve technical issues, work across front-end and back-end systems, follow SDLC best practices, and collaborate with users and technical teams to gather requirements and drive engineering best practices.

Senior backend developer building and performance-tuning RESTful services. Responsibilities include pair programming, TDD, scalable system design, refactoring, on-call rotation, and cross-team technical analysis.

Develop and architect Java-based web applications using Spring MVC. Build REST services, front-end HTML/CSS/JavaScript, and implement automated testing (JUnit, Selenium, Cucumber). Work in Agile teams with CI/CD, JMS messaging, JPA/Hibernate, Maven, WebSphere, Oracle, and Linux. Support accessibility (WCAG) and state government environments as needed.

Develop and implement scalable e-commerce system components per solution architecture. Collaborate with product, operations, and architecture teams, participate in sprint planning, produce documentation, create/modify tests and test harnesses, and assist in triaging production and non-production issues.

Develop and maintain Java/J2EE web applications and integrations using ESB technologies (Fuse, Camel, ServiceMix). Implement JMS messaging, optimize services for large-volume data, work with Oracle databases and PL/SQL, build SOAP/REST services, and perform data analysis and performance tuning using Java frameworks and related tools.

Port a PHP-based inventory tracking system to Java/Spring Boot and migrate a monolithic app to a service-oriented architecture on Cloud Foundry. Design, develop, and deploy large-scale Java projects, implement full-stack features (HTML/CSS/JS), integrate with Oracle, use GitHub, and follow cloud development principles.

Develop, maintain, and troubleshoot Java-based enterprise web applications. Investigate defects and enhancement requests, design and implement fixes, collaborate with infrastructure and business owners, and support legacy systems in a cross-functional team environment.

Full‑stack Java developer responsible for front-end and back-end web development: build UIs (HTML/CSS/JavaScript), RESTful web services, integrate UI with services, and work with frameworks like Struts/Spring; Angular 2 experience is a plus. Requires 7+ years of relevant experience.

Design, develop, and maintain scalable backend systems and microservices for fintech products. Build REST APIs, support greenfield projects and improve existing systems (card payments, treasury, transactions, crypto liquidity). Use Java and Spring Boot with Postgres, practicing TDD, DDD, and CI/CD to deliver maintainable, high-performance services.

Design, develop, and maintain scalable backend systems and microservices (payments, treasury, transactions, crypto). Build REST APIs, use Java and Postgres, apply Spring Boot, TDD, DDD, and CI/CD to deliver maintainable, high-performance services.

Develop and maintain high-performance Android applications, design new features, troubleshoot code, and work with REST/Web Services in a multi-threaded environment.

The Backend Engineer will develop cloud-native applications, engage in full life-cycle development, and work with various technologies including Java/Kotlin and AWS in a remote environment.

Develop, maintain, and troubleshoot cloud-based stateful IVR applications. Integrate IVR with internal services, configure application logic using SQL, implement operational improvements, collaborate with project teams and stakeholders, and participate in initiatives to improve call steering and IVR architecture for high-quality customer voice experiences.

Full-stack developer responsible for enhancing a monitoring application: build UX-driven web interfaces, maintain and enhance core subsystems, define requirements, prototype and design, develop code, test, deploy, troubleshoot, and lead small teams.

Design, develop, test and deploy enterprise Java/J2EE web applications using Spring, Dojo, web services and relational databases. Participate in full development lifecycle, estimate work, collaborate with architects, and document solutions.

Develop middleware, services, and user interfaces for IoT solutions. Build REST APIs and backend systems using Java/J2EE and app servers, implement frontend features with JavaScript frameworks, apply OO design, perform data modeling, and work with relational and NoSQL/Hadoop data stores. Use Maven, Git, and Jenkins.

Senior hands-on Java Developer with at least nine years' experience building complex Java applications. Responsibilities include concurrent and multithreaded programming, binary manipulation in Java, object-oriented design, working in UNIX environments, SQL development, unit testing with JUnit, scripting (Python), and optionally Hadoop.

Design, develop, and test solution integration middleware for IoT solutions. Expand and maintain the data model. Perform both UI and backend development and collaborate closely with the solution architect and IoT stakeholders.

Develop and operate Java Spring Boot microservices, deploy and manage services on Kubernetes, perform JVM profiling and heap analysis, load test, diagnose memory leaks, OOMs and P99 latency spikes, remediate security vulnerabilities, and maintain GitHub-based CI/CD and branching workflows.

The Lead C# Web Developer will design and develop secure MVC applications, perform coding, testing, and debugging while enhancing web platforms and integrating with vendor systems.

Develop, install, maintain, and modify Java-based applications. Analyze user requirements, design and implement solutions, and work independently on moderate-to-complex problems. Collaborate with internal/external contacts and may extend work to front-end technologies like JavaScript, HTML, and Angular.

Develop and deliver high-volume, customer-facing Java web applications using Spring and related technologies. Build REST services, integrate with SOAP/REST back-ends, participate in Agile/TDD workflows, perform code reviews, and mentor junior developers while driving improvements.

Maintain, support, and enhance IAM Identity Infrastructure applications. Interface with middleware to upgrade 300+ WebLogic instances and modify apps for compatibility. Perform application regression testing, fix backward-compatibility issues, and handle installation, configuration, and optimization on platforms like WebLogic, Tomcat, and Drools (JBoss). Support design, build, and operation of large-scale enterprise applications.