Senior Full Stack Java Developer

Role: Senior Full Stack Java Developer Location: Santa Clara, CA (Onsite 5 days) Duration: 6+ Months MUST-HAVE Skills for This Rol eFull Stack with Strong Backend Experience — Candidate must demonstrate hands-on backend engineering depth (Java 21 / Spring Boot) alongside front-end capability (React preferred )SQL Server Expertise — Proven, hands-on experience with Microsoft SQL Server: schema design, query optimization, stored procedures, and performance tunin gData Mapping — Experience designing and executing data mapping strategies across systems, including field-level mapping, transformation rules, and validation logi cData Migration — Demonstrated ownership of end-to-end data migration projects; experience moving data between databases or platforms with integrity checks and rollback plannin gPower BI — Hands-on experience building Power BI dashboards, semantic/data models, and datasets connected to SQL Server or other backend sources (minimum 20% of recent project scope )Data Transformation — Ability to design and implement transformation logic within ETL/ELT pipelines, including business rule application and data normalizatio n Overview : We are seeking a highly skilled Contract Senior Full-Stack Software Engineer to join our Manufacturing Execution System (MES) Software Engineering team, reporting to the Software Engineering Manager. This role supports modernization of legacy manufacturing systems into a cloud-native, multi-tenant SaaS platform on Microsoft Azure. This is a hands-on engineering role covering front-end development, backend services, system architecture, and data/analytics enablement, with SQL Server to PostgreSQL migration planned in a later phase. The engineer will work closely with architecture, DevOps, and engineering teams to design and deliver scalable MES SaaS capabilities, APIs, and analytics solution s. Key Responsibiliti es:Design, build, and deliv er MES SaaS product features end-to- end across UI, API, backend, and data lay ersDevelop mode rn front-end applications using React (preferred) or Angular/ VueBuild backend services usi ng Java 21 and Spring B ootDesign and impleme nt RESTful APIs and microservi ces supporting MES workfl owsImpleme nt gRPC-based cross-service communicat ion for high-performance service-to-service interact ionU se Temporal for workflow orchestrat ion for complex MES and enterprise proces sesContribute to solution architecture and system des ign for scalable multi-tenant SaaS platf ormRefactor legacy MES components into modular cloud-native servi cesDefine and impleme nt multi-tenant SaaS architect ure (isolation, scalability, performan ce)Design and execute data mapping and migrat ion from SQL Server to PostgreSQL (later phase) — including field mapping, transformation rules, and data integrity validatio n ★Build and suppo rt Power BI dashboards and MES analytics la yer including semantic models and dataset s ★Develop and mainta in ETL/ELT data pipelines and transformation lo gic supporting reporting and analytic s ★Work with Azure services (App Services, AKS, Functions), Docker, and Kuberne tesSupport CI/CD pipelines, testing, and production relea sesIntegrate legacy MES systems with modern SaaS servi ces Must Have Skills & Experie nce:Core Enginee ring8 to 10+ years software engineering experien ce ( full-stack or backend-h eavy with demonstrated backend de pth)Strong hands-on architecture, design, and development experi enceDeep experience w ith Java 21 and Spring BootStrong front-end development experience w ith React (prefer red) or Angular /Vue ★ Data & Database — MUST HAVE★ MUST: SQL Server — Deep, hands-on experience with Microsoft SQL Server (schema design, stored procedures, query optimization, indexing strategies, and performance tun ing)★ MUST: Data Mapping — Proven ability to design field-level mapping specifications and transformation rules across heterogeneous sys tems★ MUST: Data Migration — End-to-end ownership of data migration initiatives including planning, execution, validation, and rollback; experience with SQL Server migration prefe rred★ MUST: Data Transformation — Hands-on ETL/ELT pipeline development with business rule application, normalization, and data quality enforce mentStrong experience w ith Postgr eSQL, including migration exposure from SQL Se rverStrong understanding of relational database design and performance tu ningExperience w ith data lakes, ETL, or analytics sys tems ★ Analytics & Reporting — MUST HAVE★ MUST: Power BI — Hands-on experience building dashboards, datasets, and semantic/data models in Power BI; connected to SQL Server or enterprise data sources; must represent a meaningful portion (approx. 20%+) of recent project s cope Architecture & C loudExperience designing or working w ith multi-tenant SaaS applicat ionsStrong experience w ith microservices architecture and REST APIsExperience w ith gRPC for service-to-service communica tionFamiliarity w ith Temporal workflow orchestra tionExperience with MES / ERP / manufacturing systems (prefer red)Azure cloud experience (App Services, AKS, Functi ons)Docker, Kubernetes, and distributed systems experi ence Soft Sk ills:Strong technical documentation skills (design docs, architecture diagrams, runb ooks)Excellent communication across engineering and business stakeho ldersStrong collaborative team player mi ndsetAbility to operate in a fast-paced, execution-driven enviro nmentStrong ownership and end-to-end delivery accountab ility