Top Senior Java Engineer Jobs in Chicago, IL

Develop and maintain scalable Java and Spring Boot backend applications and REST APIs. Optimize CPU, memory, and overall application performance; identify bottlenecks; resolve production issues; and contribute to architecture, code reviews, reliability, and scalability. The role also involves Node.js or Python FastAPI services, cross-functional collaboration, and potential work with GraphQL, generative AI, cloud platforms, containers, CI/CD, and monitoring tools.

Designs, develops, tests, documents, and operates large-scale distributed software products for Allstate’s Enterprise Payments organization. Responsibilities include building Java and Spring Boot REST APIs, designing microservices, collaborating on system architecture, practicing paired programming and test-driven development, establishing CI/CD pipelines, improving performance, securing APIs, supporting production applications, and contributing to Agile planning, retrospectives, and knowledge sharing.

Senior Java developer responsible for designing and building distributed, web-based applications using Java/J2EE. Work includes OOA/OOD, core business logic, APIs/frameworks, UI integration, SOA/web services, test-driven development, automation tooling, and working across Unix/Windows environments. Collaborate in agile teams and use modern frameworks and messaging/DB technologies.

Design, build, and maintain scalable J2EE business applications. Implement features, fix bugs, participate in code reviews, automate tests, optimize performance, and produce documentation.

Designs, develops, tests, deploys, modernizes, and supports Java enterprise applications and integrations. Troubleshoots applications, APIs, databases, and data pipelines; improves reliability through automation, testing, monitoring, CI/CD, and secure coding. Translates business requirements into maintainable solutions, collaborates with stakeholders and vendors, participates in code reviews and design discussions, and mentors teammates. The hybrid role requires working from the Chicago office at least one day per week.

Lead development of Java/J2EE applications using Spring, Hibernate, Web Services, and WebSphere. Work with PL/SQL, Adobe Flex, unit testing, basic Unix, and follow SDLC processes.

Lead reverse-engineering of TIBCO BW/MFT processes, document business rules, and reimplement them as modular Java/Spring Boot microservices. Migrate protocols to Kafka/RabbitMQ/REST, ensure data consistency, and perform performance testing to match legacy SLAs.

Design and build Java/J2EE solutions using Spring and APIs; develop webservices, DB schemas, PL/SQL and transactional SQL in DB2/Oracle; collaborate with architects, developers and DevOps to implement CI/CD (Jenkins, uDeploy), ensure code quality (Sonar), perform code reviews and testing, resolve technical roadblocks, and drive process improvements. Requires strong communication and teamwork.

Develop and maintain core Elasticsearch infrastructure and shared platform features. Design scalable APIs, solve performance and concurrency issues, improve observability and CI/CD, automate developer workflows, lead cross-team projects, support complex operational investigations, and use AI to accelerate development and debugging.

The role involves improving Elasticsearch's distributed components, maintaining cluster coordination systems, and addressing complex issues to optimize performance and scalability.

Lead design, development, maintenance, and 24/7 support of Java-based web applications on WebSphere. Collaborate with analysts and architects, write DB2 stored procedures, conduct code reviews, create automated tests, troubleshoot production issues, and guide development iterations.

Design, develop, and integrate web applications using Java and related frameworks. Create UI, database architecture, technical specs, and code components. Coordinate with analysts and architects, conduct code reviews, troubleshoot across environments, and support agile development lifecycle.

Seeking a Sr. Java Developer with over 5 years experience in Ins Bridge development tools for Property & Casualty Insurance, skilled in Java, SQL, and XML.

Seeking a Sr. Java Developer with 5+ years in Ins Bridge tools and insurance domain. Responsibilities include system development and maintenance support for actuarial models.

The Senior Java Web Developer will design, develop, test, and implement web and API-based software solutions while collaborating with a team and managing multiple priorities.

The Senior Java Web Developer will design, develop, and implement web and API-based software solutions, ensuring quality and adherence to standards.

Design and develop web and API-based software solutions, manage multiple priorities, and ensure compliance with best practices. Requires strong collaboration and communication skills.

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.

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 web-based UI and REST middleware for federal health IT systems. Participate in Agile/SAFe ceremonies, write design documents, implement features, resolve bugs, and support CI/CD pipelines while collaborating with product, QA, and stakeholders.

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.

Lead backend Java development and architecture for enterprise applications. Design and deliver scalable, resilient microservices and APIs, mentor developers, lead technical decisions, support production incidents, and implement CI/CD and cloud-native solutions on AWS.

Design, develop, and maintain Java-based backend services and APIs for KeeperApp. Own backend components, optimize MySQL schemas/queries, ensure performance and reliability, apply secure coding practices, participate in code reviews, and collaborate with product and engineering teams to deliver features iteratively.

Design, build, and maintain scalable enterprise full-stack applications using Java, Spring Boot, microservices, and modern front-end frameworks. Implement cloud-based solutions on AWS, contribute to CI/CD and DevOps automation, optimize performance and security, and integrate AI-driven capabilities using Python and orchestration tools like LangChain and LangGraph.