Top Senior Java Developer Jobs in Philadelphia, PA

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.

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.

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.

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, develop, test, and deploy Java/J2EE applications and integrations. Lead implementation planning, gather and specify requirements, mentor junior developers, resolve defects, support production (on-call), and ensure database and SOX-compliant process documentation.

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.

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.

Lead migration of legacy COBOL systems to Java-based microservices and develop scalable, secure full-stack solutions on Azure. Build RESTful APIs, optimize performance, ensure DoD cybersecurity compliance, collaborate across teams, document architectures, and participate in Agile ceremonies.

Senior Java Engineer responsible for developing and maintaining highly available Java services (Java 17+) using Spring, working with cloud platforms (AWS, GCP), Postgres, CI/CD, and container orchestration. Provide technical leadership, design secure internet-facing APIs, coordinate deployments, mentor engineers, and collaborate cross-functionally to deliver production software.

The Senior Java Developer will design and implement solutions for logistics systems, ensuring code quality, observability, and collaborating with teams for operational excellence.

Design, build, and maintain high-scale backend services (Spring Boot, microservices). Provide technical leadership and mentoring, implement automated tests, optimize performance, and build CI/CD pipelines. Participate in Agile ceremonies and support DevOps practices; occasionally contribute to full‑stack initiatives.

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 role involves designing and developing backend services for a microservice architecture using Java, mentoring team members, and improving development processes.

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 and maintain web services, lead projects, provide technical leadership, and mentor junior team members in a senior engineering role.

Technical lead to migrate legacy Java services to a microservices architecture using Spring Boot and Pivotal Cloud Foundry. Implement microservices, ensure code quality with SonarQube, work in Agile/Scrum, and use GoCD for continuous delivery. Requires 5+ years Java experience and at least one full lifecycle Spring Boot engagement.

Architect and design n-tier Java EE web applications, translate functional requirements into technical designs, lead and mentor developers, implement development best practices (TDD, CI), work with stakeholders, and oversee delivery for high-quality deployments.

Design, develop, and implement web-based Java applications following SDLC. Create design documents, code, and test features; debug and resolve technical issues; collaborate with operations and QA to deliver releases in an agile environment.

Design, develop, and implement web-based Java applications following SDLC. Create design documents, perform coding, testing, debugging, and collaborate with operations and QA to ensure successful releases. Required to use Scala/Akka/Play, Java, Spring MVC, Cassandra and related technologies. Contract role; interviews via phone and Skype.

Design, build, and maintain low-latency, high-availability backend services and REST APIs. Troubleshoot production issues, improve performance, write technical specs, participate in on-call rotations, and collaborate on the bot runtime platform.

Design and develop backend systems for a trading platform, implement low-latency components, collaborate with teams, and maintain automated test suites.

Design, develop, and optimize high-performance Java backend systems. Contribute to architecture, implement core modules, troubleshoot production issues, perform code reviews, and improve scalability, availability, and reliability of distributed financial or blockchain systems.

Design, develop, and maintain scalable Java backend services and RESTful APIs. Collaborate with frontend, product, and stakeholders; write clean, tested code; troubleshoot and resolve issues; participate in code reviews; and improve systems, particularly for large-scale distributed environments.

Design, develop, and maintain high-performance Java microservices using Spring Boot. Implement threading/concurrency, fault tolerance (Hystrix/circuit breakers), observability (SLI/SLO), event-driven solutions with Kafka, and deploy on Kubernetes/AWS. Mentor junior developers and collaborate with cross-functional teams.