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# Senior Fullstack Engineer in Brentwood

- **Company:** Energy Jobline
- **Location:** Brentwood, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Applications Architecture, Business Logic, Automation of Tests, C Sharp (Programming Language), Software as a Service, Code Review, Continuous Integration, Customer Data Management, Data Integrity, Software Design Patterns, Python (Programming Language), PostgreSQL, Query Optimization, Search Technologies, Secure Coding, SQL Databases, TypeScript, User Interface Testing, Web Content Accessibility Guidelines, ReactJS, Backend, Data Layers, Build Management, Material UI, Integration Tests, Amazon Bedrock, Front End Software Development, Api Management, Serverless Computing, Web Api
- **Published:** October 20, 2026
- **Apply:** https://www.energyjobline.com/job/senior-fullstack-engineer-brentwood-32009127

## About the Role

* Senior-level engineering experience, typically 8+ years or equivalent demonstrated expertise, delivering and maintaining production SaaS applications.
 * Strong React and TypeScript experience, including component architecture, application state, navigation, API integration, and performance.
 * Hands-on C#/.NET experience building and supporting maintainable production APIs and backend services.
 * Strong PostgreSQL and SQL fundamentals, including schema design, migrations, transactions, query optimization, and data integrity.
 * Experience building secure SaaS software using authentication, authorization, data protection, and appropriate separation of customer data.
 * Demonstrated automated testing across the stack, code reviews, CI/CD practices, AWS deployments, and production troubleshooting.
 * Ability to weigh end-to-end technical tradeoffs, communicate clearly in English (B2+), work well across teams, and mentor other engineers.
 * Experience working with modern state management approaches, accessible component libraries, UI testing, and performance or accessibility auditing is a plus.
 * Experience with Data-rich dashboards, advanced tables and forms, real-time user experiences, visual editors, or content-management workflows is a plus.
 * Experience with Python or Rust for supporting services; Amazon Bedrock, AI integrations, or vector search is a plus.
 * Experience with infrastructure as code, background and event-driven processing, observability, caching, or cloud reliability improvements is a plus.
 * Fintech or enterprise SaaS experience, SOC 2-related engineering practices, AI-enabled features, or additional programming are highly desirable for this role.

## Description

* Design and build accessible, responsive React and TypeScript interfaces with reusable components, clear interactions, and consistent design patterns.
 * Own features end-to-end, connecting frontend behavior and state management to API contracts, business logic, and PostgreSQL data.
 * Develop and maintain secure C#/.NET web APIs with thoughtful data models, validation, performance considerations, and reliable changes.
 * Apply modern frontend tooling, maintainable application architecture, and shared design systems to deliver scalable, intuitive experiences.
 * Follow secure development practices including strong authentication, authorization, data protection, and safe handling of untrusted input.
 * Build and support AWS cloud- solutions using containerization, serverless approaches, and modern CI/CD practices.
 * Write automated frontend, backend, and integration tests; review code, document decisions, and help deliver safe, repeatable releases.
 * Partner with Product, Design, and QA to improve complex workflows, browser performance, responsive layouts, and accessibility aligned with WCAG 2.2 AA.
 * Investigate and resolve production issues across the UI, API, and data layers; mentor teammates and contribute to secure SDLC practices and SOC 2 readiness.