Top Senior Java Developer Jobs in Philadelphia, PA

The Java Developer will work on projects requiring strong Java development skills, particularly with Spring, REST, and CI/CD practices. 7+ years of experience is necessary.

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.

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.

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.

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.

Senior backend-focused engineer responsible for designing, building, and supporting high-scale Java/Spring Boot microservices, driving CI/CD and DevOps practices, mentoring teammates, implementing automated tests, troubleshooting performance issues, and contributing to pipeline automation and continuous improvement.

As a Senior Software Engineer at Fiserv, you'll design and build high-scale backend services using Java and Spring Boot, lead technical initiatives, and implement CI/CD processes while ensuring software quality through testing and optimization.

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.

Design, develop, and maintain full-stack web applications using Angular and Spring Boot. Build RESTful APIs, implement CI/CD pipelines with Terraform, deploy cloud solutions (preferably AWS), optimize performance and security, participate in code reviews and debugging, and collaborate with cross-functional teams. Provide technical support during critical phases.

Seeking a Senior Full Stack Java Developer to build and maintain Angular frontends and Spring Boot backends, design RESTful APIs, implement CI/CD with Terraform, deploy cloud solutions (preferably AWS), optimize performance and security, participate in code reviews and cross-functional collaboration, and support projects during critical phases.

As a Senior Software Engineer, you will maintain and develop data connectors, enhance data integrations, and improve developer experience within the ClickHouse data ecosystem.

Join a small team to design and deliver high-quality, low-maintenance Java applications. Coach client teams on modern development practices, apply test-driven development, and pursue ongoing professional growth through training and mentorship.

The Senior Java Developer will design, develop, and implement custom software solutions in Agile teams, mentor juniors, and ensure product quality.

Senior Java engineer delivering AI-augmented production features and modernizations across a Java/Python/AWS stack. Pair with engineers to embed agentic practices, own systems end-to-end, participate in AI-augmented reviews, and judge agent use versus human intervention.

Senior Java engineer delivering AI-augmented production features and modernizations across a Java/Python/AWS stack. Own systems end-to-end, pair with engineers to transfer agentic practices, perform AI-augmented code reviews, and judge when to trust or intervene with agent outputs.

Architect, implement, and optimize live and on-demand streaming pipelines in Wowza. Design scalable transcoding and packaging workflows, debug performance issues, integrate native code via JNI, and serve as a streaming subject-matter expert across cross-functional projects.

Optimize and scale blockchain node performance, design and implement core system plugins, collaborate with cross-functional teams, conduct performance testing and debugging, and stay current on blockchain and distributed systems technologies to maintain reliable infrastructure.

Develop and maintain Java backend services for enterprise blockchain applications, integrate APIs with React/Vue frontends, design scalable blockchain solutions, troubleshoot complex backend issues, and collaborate with the team to apply best practices and stay current with blockchain trends.

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.