Top Java Developer Jobs in Seattle, WA

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.

As a Principal Software Data Engineer, you'll lead the design, development, and optimization of large-scale data platforms and pipelines, ensuring data governance and driving innovation in a collaborative environment.

The Sr Staff Software Engineer will drive technical strategy, design scalable systems, lead engineering activities, and mentor teams while managing platform improvements and integrations.

As a Staff Software Engineer, you will lead technical strategies, develop APIs and microservices, and mentor engineers for innovation at GEICO.

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 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, and maintain enterprise-grade Java microservices using Spring Boot and PostgreSQL. Collaborate with product teams in Agile/Scrum, produce APIs and documentation, troubleshoot build/deploy issues, and support modernization of legacy IRS systems in a cloud environment.

Designs, implements, and runs Java Spring Boot microservices and REST APIs; leads design, CI/CD, TDD, performance tuning, security, and cross-product collaboration. Coaches teams and owns product KPIs and production support.

Design, develop, and maintain scalable Java/Micronaut enterprise frameworks and cloud-native microservices on Azure. Build and deploy services to AKS, create CI/CD pipelines with Azure DevOps, implement batch/asynchronous workflows, integrate messaging systems, optimize databases, and ensure security, observability, and resilience.

As a Senior Developer, you will modernize COBOL systems to Java, enhancing functionality and performance while collaborating with stakeholders and ensuring coding standards are met.

As a Senior Software Engineer, you will build cloud solutions, define migration strategies, mentor junior engineers, and ensure architectural integrity while collaborating with peers.

Lead an agile engineering team to design, build, and operate scalable Java-based, cloud-native, event-driven systems. Mentor developers, perform design/code reviews, troubleshoot production issues, and drive AI-assisted development and engineering best practices.

The Software Engineer will design and implement customer-facing software, focusing on security and cloud solutions, while collaborating with cross-functional teams.

Build and maintain scalable backend services in Python and Java (Spring Boot), develop responsive React frontends, integrate AI/GenAI (LLMs, RAG) using frameworks like LangChain/LlamaIndex, collaborate with cross-functional teams, troubleshoot and optimize systems, and ensure coding, security, and performance best practices.

Lead backend architecture and implementation for Java Spring microservices, validate and own AI-assisted code, mentor engineers, collaborate with product to deliver features, and drive technical excellence and scalable, test-covered systems.

Design, build, and deploy cloud-native, API-first mortgage servicing components using Java/Node.js and React. Collaborate with global teams to implement distributed, event-driven systems (Kafka), ensure performance, observability, CI/CD, and adherence to API standards and testing practices.

The Web Developer is responsible for designing, developing, debugging, and modifying software applications, providing solutions, and supporting documentation.

Develop and maintain enterprise-class software for centralized management of hyper-converged data center products. Collaborate with cross-functional teams in an Agile/Scrum environment, integrate core product components, implement REST APIs, and automate firmware/software updates. Troubleshoot complex technical issues and drive maintainable software design using Java, Python, Spring, Cassandra and VMware technologies.

Senior Java Developer responsible for designing, implementing, and testing web and client/server applications using Java/J2EE and related frameworks (Spring, Hibernate). Work includes frontend integration (Angular/Bootstrap), database development and optimization (Oracle/SQL), messaging (MQ/JMS), CI/build tooling, testing, version control, and participating in Agile ceremonies and SDLC activities. Mentors team members and supports deployments.

Senior Java Developer to design, build and maintain Java/J2EE web and client/server applications. Work includes OOA/OOD, distributed systems, databases, messaging, APIs/frameworks, UI/frontend frameworks, SOA/web services, and automation in an Agile/TDD environment. Preferred experience with Cassandra, RabbitMQ, Pivotal Cloud Foundry and Spring Boot.

Develop and maintain ATG/Java J2EE applications across the full SDLC. Implement REST/XML services, front-end features (AngularJS, jQuery, AJAX, JSON), and server-side components using Struts, Spring, Hibernate. Work with WebLogic, Oracle DB, JDBC/PLSQL, debug and document code, and collaborate with cross-functional teams.

Develop Java/J2EE applications using Spring Boot and microservice architecture with AngularJS front-ends. Work with Cassandra and RabbitMQ concepts; cloud experience (Pivotal Cloud Foundry or AWS) is a plus. Requires 5+ years experience and a bachelor’s degree. Contract role with relocation and benefits.

Design, implement, test, and maintain full‑stack features and services for the Cayuse Research Platform. Drive architecture, prototypes, and technical debt reduction while practicing TDD, expanding automated QA, collaborating cross‑functionally, and ensuring high quality delivery in an Agile environment.