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 Role

• Full 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 tuning
• Data Mapping Experience designing and executing data mapping strategies across systems, including field-level mapping, transformation rules, and validation logic
• Data Migration Demonstrated ownership of end-to-end data migration projects; experience moving data between databases or platforms with integrity checks and rollback planning
• Power 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 normalization

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 solutions.

Key Responsibilities:

• Design, build, and deliver MES SaaS product features end-to-end across UI, API, backend, and data layers
• Develop modern front-end applications using React (preferred) or Angular/Vue
• Build backend services using Java 21 and Spring Boot
• Design and implement RESTful APIs and microservices supporting MES workflows
• Implement gRPC-based cross-service communication for high-performance service-to-service interaction
• Use Temporal for workflow orchestration for complex MES and enterprise processes
• Contribute to solution architecture and system design for scalable multi-tenant SaaS platform
• Refactor legacy MES components into modular cloud-native services
• Define and implement multi-tenant SaaS architecture (isolation, scalability, performance)
• Design and execute data mapping and migration from SQL Server to PostgreSQL (later phase) including field mapping, transformation rules, and data integrity validation
• Build and support Power BI dashboards and MES analytics layer including semantic models and datasets
• Develop and maintain ETL/ELT data pipelines and transformation logic supporting reporting and analytics
• Work with Azure services (App Services, AKS, Functions), Docker, and Kubernetes
• Support CI/CD pipelines, testing, and production releases
• Integrate legacy MES systems with modern SaaS services

Must Have Skills & Experience:
Core Engineering

• 8 to 10+ years software engineering experience ( full-stack or backend-heavy with demonstrated backend depth)
• Strong hands-on architecture, design, and development experience
• Deep experience with Java 21 and Spring Boot
• Strong front-end development experience with React (preferred) 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 tuning)
• MUST: Data Mapping Proven ability to design field-level mapping specifications and transformation rules across heterogeneous systems
• MUST: Data Migration End-to-end ownership of data migration initiatives including planning, execution, validation, and rollback; experience with SQL Server migration preferred
• MUST: Data Transformation Hands-on ETL/ELT pipeline development with business rule application, normalization, and data quality enforcement
• Strong experience with PostgreSQL, including migration exposure from SQL Server
• Strong understanding of relational database design and performance tuning
• Experience with data lakes, ETL, or analytics systems

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 scope

Architecture & Cloud

• Experience designing or working with multi-tenant SaaS applications
• Strong experience with microservices architecture and REST APIs
• Experience with gRPC for service-to-service communication
• Familiarity with Temporal workflow orchestration
• Experience with MES / ERP / manufacturing systems (preferred)
• Azure cloud experience (App Services, AKS, Functions)
• Docker, Kubernetes, and distributed systems experience

Soft Skills:

• Strong technical documentation skills (design docs, architecture diagrams, runbooks)
• Excellent communication across engineering and business stakeholders
• Strong collaborative team player mindset
• Ability to operate in a fast-paced, execution-driven environment
• Strong ownership and end-to-end delivery accountability