Senior Fullstack Engineer

ForesiteOverland Park, KS

About The Position

Foresite is seeking a product-minded Senior Fullstack Engineer with a mastery of modern front-end architectures to help build and scale our multi-tenant SaaS platform. As a foundational member of our engineering team, you won’t just write code—you will architect the "humans-first" interfaces that make complex cybersecurity data intuitive and actionable. In this role, you’ll be working on our multi-tenant SaaS platform built with modern web technologies. Your primary focus will be leading the evolution of our front-end ecosystem while maintaining a strong, lateral grip on our backend services. You will ensure our platform remains performant, accessible, and maintainable as we scale.

Requirements

  • 5+ years of professional experience in Full Stack development, with a clear specialization in front-end architecture for complex B2B SaaS or Cybersecurity platforms.
  • Deeply proficient in React 18/19 and TypeScript.
  • Comfortable with React Router v7 and modern routing patterns.
  • Build secure web applications by default. Understand and mitigate common vulnerabilities such as XSS, CSRF, and injection attacks, and know how they apply in modern React and TypeScript apps.
  • Comfortable designing schemas, writing queries, and reasoning about performance across PostgreSQL and Firestore.
  • Feel at home with modern ORMs and use runtime validation to enforce data integrity at system boundaries.
  • Experience with multi-tenant architectures and implementing robust RBAC/ABAC models to enforce strict data isolation.
  • Write tests as part of the job, not as an afterthought. Proficient with Vitest and Testing Library for unit and integration coverage, and Playwright for critical E2E flows.
  • Care about developer experience. Comfortable with CI/CD pipelines, Git, and modern workflows like Stacked PRs. Embrace AI-assisted development tools to ship faster without sacrificing quality.
  • Comfortable on both sides of a system boundary — consuming third-party APIs on the frontend and writing the backend glue that connects them. Understand API contracts, webhook reliability, and data consistency across services.

Nice To Haves

  • You have a background in Cybersecurity, understanding the unique UI/UX and security challenges of the industry.
  • You have a "Security First" approach to coding, always thinking about the OWASP Top 10.

Responsibilities

  • Architect and build front-end features for our 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 that scales consistently across our client base
  • Partner closely with product, design, and backend engineers to ship polished, production-ready features
  • Integrate with PostgreSQL and NoSQL data stores through clean, well-structured backend service layers
  • Design, consume, and extend RESTful APIs that power our platform’s core workflows
  • Champion code quality through thorough reviews and consistent enforcement of engineering standards
  • Own your deployments—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
  • Apply security-conscious development practices, particularly around auth, RBAC, and data isolation in a multi-tenant context
  • Engage actively in Agile ceremonies including sprint planning, standups, reviews, and retrospectives
  • Document what you build and contribute to a culture of knowledge sharing across the team

Benefits

  • We leverage our Google Cloud Premier SecOps Partnership to stay at the cutting edge
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