Top Senior Java Developer Jobs in Denver & Boulder, CO

Design, develop, and modernize Java applications for federal systems using Spring Boot and Hibernate; maintain legacy Struts2/J2EE apps; deploy and optimize cloud solutions (AWS/Azure); build APIs, CI/CD pipelines, and unit tests (JUnit); support IAM/SAML and Login.gov integrations; troubleshoot distributed environments and participate in Agile/SAFe delivery.

Develop Java EE applications and web services using Spring and Hibernate. Implement SOAP/REST APIs, and utilize CI/CD tools like Jenkins. Engage with cloud technologies and improve business processes.

The Java Engineer will design, develop, implement, and support systems for processing massive real-time data, collaborating with a team of 20 developers.

Design, develop, test, deploy, and maintain enterprise Java applications for USPS. Build RESTful APIs with Spring, translate requirements into architecture, implement CI/CD/DevSecOps, integrate relational databases, troubleshoot complex issues, and collaborate with cross-functional Agile teams to deliver high-quality software solutions.

Design, develop, test, and deploy full-stack Java applications (backend Java/Spring Boot, frontend React/Angular, PostgreSQL). Lead architecture decisions, mentor developers, perform code reviews, troubleshoot issues, implement testing strategies (JUnit, Cypress, Playwright), collaborate with product/QA/DevOps in Agile, and support VA mission-critical initiatives while meeting security and clearance requirements.

Lead design, development, testing, and maintenance of enterprise Java microservices and front-end applications. Build APIs, CI/CD pipelines, and containerized deployments; troubleshoot production, ensure security/compliance, mentor junior developers, and collaborate within Agile teams.

Build and deliver backend enterprise web applications for Citi's Integrated Digital Assets Platform using Java/Spring and web3 technologies. Collaborate with distributed teams, follow best practices and design patterns, write technical documentation, resolve issues, and ensure scalability, reliability, and performance.

Design and implement scalable microservices and customer/internal APIs. Lead technical specification, development, integration, testing, and release. Optimize performance, refactor code, collaborate with stakeholders, mentor engineers, and ensure reliable, maintainable solutions across the platform.

Reverse-engineer TIBCO BW/MFT processes to extract business logic, then design and implement a modular Java/Spring Boot microservices replacement. Migrate protocols to Kafka/RabbitMQ/REST, translate XML transformations, ensure data persistence and consistency, and validate performance to meet existing SLAs.

Analyze legacy TIBCO BusinessWorks/MFT processes to extract business logic, design and build a decoupled Java/Spring Boot microservices platform, migrate protocols to Kafka/RabbitMQ/REST, translate XML-heavy transformations to modern formats, and validate performance and SLAs to match legacy throughput.

Design, build, and maintain Java/J2EE multi-layer applications and APIs. Collaborate with architects and DevOps to implement CI/CD, code quality, testing, and database solutions (DB2/Oracle, PL/SQL). Support cross-team delivery, resolve technical roadblocks, and drive process improvements in an asset management/financial services context.

Design, develop, and maintain high-performance, secure Java backend services and APIs. Ensure reliability, scalability, and cost-efficiency across microservices, databases, messaging systems, and capacity planning. Troubleshoot, profile, benchmark, and optimize systems (including ML applications) and collaborate with Kazakhstan stakeholders.

Build and maintain backend services and REST APIs using Java (11/17+) and .NET (ASP.NET Core). Implement business logic, data access, and integrations; write well-tested code with JUnit/xUnit/NUnit; contribute to CI/CD and DevOps; participate in design, code reviews, and Agile ceremonies.

Design, build, and improve Elasticsearch distributed-systems components for scalable, concurrent, and consistent indexing. Maintain cluster coordination for performance and resilience, push system scale limits, investigate performance and concurrency issues, support operations/support engineers, and lead projects involving multiple engineers from design through delivery.

The Senior Full Stack Java Developer will design and maintain enterprise applications using Java and modern front-end technologies while collaborating in Agile teams and mentoring junior developers.

Senior Java developer responsible for designing, developing, and deploying Java/J2EE web applications and microservices. Work includes SOAP/REST web services, CI/CD, Tomcat/WebLogic deployments, JDBC/Hibernate/iBatis integration, performance tuning, and supporting assessment/design/code/build/deploy phases, primarily for US cable MSO IT systems.

Senior Java developer responsible for designing, developing, and deploying Java/J2EE web applications and web services (SOAP/REST). Work includes microservices development, CI/CD, Tomcat/WebLogic deployments, JDBC/Hibernate/iBatis integration, caching, performance tuning, and supporting assessment/design/code/build/deploy phases for US Cable MSO systems.

Develop and maintain Java/J2EE web applications and web services (SOAP/REST); build and support microservices and CI/CD pipelines; deploy to Tomcat/WebLogic; work with JDBC/Hibernate/iBatis and caching; perform performance engineering, capacity planning, and assess design/code/build/deploy for microservices. Support US Cable MSO IT systems.

Design, build, and maintain efficient, reusable Java backend systems; translate business requirements into applications; optimize performance and stability; review and test code for quality and security; identify and fix bottlenecks and bugs; maintain code quality and system responsiveness.

Join an agile team to design, develop, test, and deploy enterprise web applications. Build high-quality Java/J2EE solutions, maintain system docs, implement RESTful services, improve SDLC practices (TDD, CI/CD, static analysis), and collaborate with architects, developers, and stakeholders. Perl experience required.

Design, build, and maintain scalable backend services and APIs using Java and Spring Boot. Implement event-driven architectures with Kafka, manage PostgreSQL/Redis data, ensure performance and reliability, troubleshoot production issues, participate in code reviews, and collaborate across teams for deployments and monitoring.

The Senior Java Developer will design and implement JEE software applications, develop automation tests and manage full software development lifecycle activities.

The Senior Java Developer will manage Java application development, focusing on scalable enterprise applications, and oversee the full software lifecycle.

The Senior Software Engineer will develop and maintain big data applications, focusing on distributed computing, automation, and collaboration with teams to enhance healthcare solutions.

Design, develop, test, containerize, and maintain mission-critical software for missile warning systems. Write unit tests, use Docker (Kubernetes a plus), implement CI/CD pipelines, produce documentation, diagnose anomalies, and work on-site with Agile teams in a secure environment requiring an active Secret clearance.