Senior Java Developer

ASSYST is seeking an experienced Senior Java Developer to build and optimize secure, high-volume backend systems and enterprise integrations for our client in Austin TX (Hybrid) The Senior Java Developer will evaluate complex system requirements, design scalable microservices and RESTful APIs, streamline data-processing pipelines, and collaborate closely with cross-functional teams to support mission-critical state applications. Responsibilities: Architecture & Integration: Design, develop, test, and document secure, scalable, and maintainable end-to-end backend interfaces and integration points for internal and external systems. API & Microservices Development: Build, document, and maintain enterprise-grade RESTful web services and microservices architectures secured with industry-standard protocols (OAuth 2.0, JWT). High-Volume Data Processing: Develop and optimize high-volume data-processing pipelines utilizing the Spring ecosystem, mapping complex data structures (XML and JSON) to ensure seamless exchange across applications and third-party platforms. Database & Performance Tuning: Work with relational databases (such as Oracle) to write and optimize complex SQL queries, utilize ORM frameworks (Hibernate, JPA), and resolve data-processing bottlenecks and API latency issues. Quality Assurance & Standards: Write comprehensive unit and integration tests and enforce application design best practices to maximize performance, scalability, and long-term maintainability. Cross-Functional Collaboration: Consult with users, systems analysts, business analysts, product managers, DBAs, and frontend developers to evaluate feasibility, clarify program objectives, define data schemas and interface requirements, and formulate structured/object-oriented development plans. Qualifications & Skill Requirements 8+ Years experience in designing and developing enterprise software solutions in Java using core enterprise concepts. 8+ Years experience in designing scalable, secure, and maintainable end-to-end interface architectures for internal and external system integrations. 8+ Years experience in deep, hands-on expertise across the Spring framework/ecosystem. 8+ Years experience in developing and consuming RESTful APIs secured with standard authentication/authorization protocols, specifically OAuth 2.0 and JWT. 8+ Years experience working within microservices architectures and parsing/transforming XML and JSON data. 8+ Years experience working with relational databases (such as Oracle), optimizing SQL, and utilizing ORM tools including Hibernate and JPA. 8+ Years experience in Implementing software engineering best practices to drive high performance, scalability, and maintainability. 8+ Years experience in Collaborating across engineering, product management, and business analysis teams to define data requirements and deliver end-to-end integrations. 3+ years’ experience in using build automation tools such as Maven or Gradle, and version control systems such as Git. 3+ years’ experience in applying Agile software development methodologies ASSYST is an Equal Opportunity Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, age, disability, military status, national origin or any other characteristic protected under federal, state, or applicable local law