Top Senior Java Developer Jobs in St. Louis, MO

Lead design and delivery of scalable, resilient distributed systems. Act as technical authority across teams, mentor engineers, drive architecture and CI/CD best practices, troubleshoot production issues, optimize performance, and enhance observability while writing production-grade Java.

Develop, test, maintain, and support secure, scalable full-stack Java applications with Angular user interfaces. Write complex code and SQL, create technical designs and documentation, conduct code and design reviews, and ensure compliance with security, audit, regulatory, and SDLC requirements. Collaborate with architects and business partners in an Agile/Scrum environment, lead project delivery, mentor globally distributed junior engineers, and participate in on-call support.

Develop secure, scalable Java applications within an agile engineering team. Provide technical guidance, review and debug production code, influence application design and technical processes, and serve as a subject matter expert. Lead adoption of AI-assisted development tools with validation for security, performance, and correctness. Apply SDLC, CI/CD, resiliency, security, and Kubernetes expertise while supporting containerized applications and collaborating with technical teams, contractors, and vendors.

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.

Investigate and resolve data-quality issues in large-scale distributed systems. Design Java-based repair pipelines and idempotent correction jobs for high-volume datasets, debug existing code, use AWS services for queue-driven and batch workflows, optimize performance and concurrency, and communicate technical findings and risks to stakeholders.

Full Stack Developer responsible for front-end and back-end development of SPA and microservices. Build RESTful services and UI using React/Redux, Vue/Angular, Node.js, Java, and PostgreSQL on AWS within agile short-sprint teams. Deliver scalable microservices and apply best practices for single-page architectures.

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.

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.

Develop, test, and maintain a complex distributed processing application using Python and Java. Collaborate with product owners, data coaches, analysts, DBAs, and Agile teams to meet backend/frontend requirements. Work with distributed workloads (Spark/Hadoop), SQL/Snowflake, AWS, shell scripting, and job scheduling/process automation. Support delivery under Agile/SAFe practices and ensure alignment with program standards.

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.

Designs and architects Java/J2EE applications: analyzes specs, produces conceptual and detailed designs, recommends solutions with BAs/management, implements multi-tier systems using Java frameworks, web services, build tools, and databases.

Senior Java Software Engineer responsible for full SDLC on the Vehicle Management Team: developing prototypes, coding Java/J2EE applications, analyzing requirements, configuring J2EE servers, performing unit/integration testing, and collaborating with IT teams on web, mobile, and cloud solutions using Spring, Hibernate, Struts, Oracle, and Web Services.

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

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.

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, build, and maintain secure, high-performance RESTful APIs and microservices using Java and Spring Boot. Collaborate with cross-functional teams, implement API security (OAuth2/JWT/OpenID Connect), optimize databases, integrate messaging systems, write unit/integration/API tests, participate in code reviews and architecture decisions, troubleshoot production issues, and contribute to CI/CD and DevSecOps practices.

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.

Develop and maintain Java-based enterprise applications using JPA/Hibernate, Spring, and REST. Analyze and document requirements, write and test code, deploy and integrate systems, evaluate vendor software, and enforce quality standards. Lead and mentor developers, create training materials, and communicate status to management while following Agile practices.

Design, develop, test, and implement Java/J2EE applications across full SDLC. Produce JUnit test cases, technical design documents, and integrate systems using WebSphere, RAD/Eclipse, JDBC, XML technologies. Work with business customers and Agile Scrum teams to analyze requirements and deliver SOX-compliant solutions.

Design and implement large-scale enterprise J2EE applications, translate functional/non-functional requirements to system specs, develop server-side Java components and UI using HTML5/jQuery/AngularJS, build REST/SOAP services, use Spring/Hibernate and PL/SQL, work in Agile, lead architecture for projects, collaborate with teams, interface with clients, and support global delivery with regular travel.

Design, architect and implement large-scale Java/J2EE enterprise applications. Develop server-side components, REST/SOAP web services, and UI using HTML5/jQuery/AngularJS. Lead architecture, translate requirements into system design, work in Agile teams, interface with clients, and support global delivery with regular travel.

Lead architecture and delivery of large-scale Java microservices. Define standards, mentor teams, design RESTful and event-driven systems, ensure scalability, resiliency, CI/CD, observability, and data governance while collaborating with stakeholders and managing technical risk.