Senior Java Developer

Job Title: Senior Java DeveloperLocation: Sunnyvale, CA 94085Work Arrangement: Fully OnsiteEmployment Type: ContractDuration: 3+ months (Based on June 27, 2026 – October 4, 2026 timeline)Pay Range: $50.00/hr. to $52.31/hr. on W2 | $60.71/hr. to $70.00/hr. on C2CDomain: Technology | Retail & Order Management Systems (OMS)Application Deadline: June 20, 2026SKILLS REQUIRED:Primary (Must-Have):✔️8–10+ years of strong hands-on experience in Core Java (Java 8+) and J2EE technologies✔️Deep expertise in Spring Boot, Spring Framework, and Microservices architecture✔️Proven experience in retail domain Order Management Systems (OMS) (Mandatory)✔️Advanced proficiency in Multithreading, concurrent programming, and REST API design✔️Hands-on experience with Kafka messaging systems and NoSQL databases (MongoDB preferred) alongside SQL✔️Solid experience in Unix/Linux environments, Shell scripting, and build tools (Maven, Gradle, Nexus)Secondary (Good to Have):✔️Experience with AWS cloud services and Python development✔️UI-related development experience (HTML, CSS, React, and front-end performance optimization)✔️Familiarity with performance testing and profiling tools (e.g., JMeter, YourKit, jProbe)✔️Strong mastery of Git, GitHub, branching strategies, and continuous integration workflowsPOSITION OVERVIEWWe are seeking an Elite Senior Java Developer with 10+ years of enterprise experience to join a high-performing engineering team fully onsite in Sunnyvale, CA. This role is embedded within the critical retail business function, focusing directly on the scalability, performance, and evolution of core Order Management Systems (OMS). As a senior backend engineer, you will design highly available distributed systems, implement sophisticated multi-threaded code, and deliver low-latency microservices capable of handling global transaction volumes.ROLES & RESPONSIBILITIES✔️Lead the backend design, development, and architectural evolution of enterprise-grade microservices and distributed systems utilizing Core Java (8+), Spring, and Spring Boot frameworks.✔️Own the development, optimization, and end-to-end integration of high-throughput Order Management Systems tailored for the global retail market.✔️Architect and scale event-driven communication channels across systems using Kafka message streams and high-performance MongoDB/SQL database schemas.✔️Write robust, clean, and highly secure multi-threaded applications while managing code repositories, code reviews, and branching strategies via GitHub.✔️Collaborate closely with cross-functional technical teams, user experience (UX) designers, and front-end engineers to define technical contracts and ensure seamless application integration.✔️Drive engineering excellence within an Agile environment by developing prototypes for advanced feature sets, troubleshooting complex integration blocks, and performance-tuning infrastructure applications.BENEFITSMedical | Dental | Vision | 401(k)EEOC ComplianceWe are an equal opportunity employer, and all qualified applicants will receive consideration for employment.DISCLAIMERAI Usage Policy: Pacer Group uses AI to assist in screening applications. Final hiring decisions are made by human recruiters based on qualifications and experience.