Senior Fullstack Engineer

Foresite Cybersecurity

Senior Fullstack Engineer developing and maintaining multi-tenant SaaS applications at Foresite. Leading front-end architecture and collaborating with cross-functional teams to ship high-quality software.

Posted 6/4/2026full-timeRemote • 🇺🇸 United StatesSeniorWebsite

Tech Stack

Tools & technologies

JavaScriptNoSQLPostgresReactTypeScript

About the role

Key responsibilities & impact

Architect and build front-end features for a multi-tenant SaaS platform using React.js and TypeScript
Work across the full stack, owning backend integrations and data access patterns end-to-end
Build and maintain a shared component library
Partner closely with product, design, and backend engineers to ship features
Integrate with PostgreSQL and NoSQL data stores
Champion code quality through thorough reviews and consistent enforcement of engineering standards
Debugging, performance tuning, and keeping production healthy
Drive architectural decisions and contribute to engineering roadmap planning
Mentor junior and mid-level engineers through pairing, feedback, and code review
Identify and address performance bottlenecks across the front-end and API layers
Engage actively in Agile ceremonies including sprint planning, standups, reviews, and retrospectives
Document what you build and contribute to a culture of knowledge sharing

Requirements

What you’ll need

5+ years of professional experience in Full Stack development
Deeply proficient in React 18/19 and TypeScript
Understanding common vulnerabilities such as XSS, CSRF, and injection attacks
Comfortable designing schemas and writing queries in PostgreSQL and Firestore
Experience with multi-tenant architectures and implementing RBAC/ABAC models
Proficient with Vitest and Testing Library for unit and integration coverage
Comfortable with CI/CD pipelines, Git, and modern workflows like Stacked PRs

Benefits

Comp & perks

Health insurance
Professional development opportunities
Flexible work arrangements

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Hard Skills & Tools

React.jsTypeScriptPostgreSQLNoSQLVitestTesting LibraryCI/CDGitmulti-tenant architectureRBAC

Soft Skills

mentoringcollaborationcode reviewknowledge sharingperformance tuningdebuggingarchitectural decision makingAgile methodologiescommunicationproblem solving