Senior Fullstack Engineer - Multi-Tenant SaaS, Impact

Foresite Cybersecurity; Overland Park (KS); On-site; USD 120,000 - 180,000; Full time

Job summary

Foresite Cybersecurity is seeking a Senior Fullstack Engineer with a product mindset to design and scale our multi-tenant SaaS platform. You will shape human-centered interfaces and ensure secure, reliable deployments.

You will work across frontend and backend, embracing a modern stack (React 18/19, TypeScript) and collaborate with product, design, and backend engineers to ship production-ready features. You will own deployments, participate in CI/CD, and champion code quality in a fast-paced,

Qualifications

• 5+ years of professional full-stack experience in B2B SaaS or cybersecurity.
• Strong front-end architecture with React 18/19 and TypeScript.
• Secure coding with awareness of XSS/CSRF and data isolation.
• Experience designing RBAC/ABAC models for multi-tenant apps.

Responsibilities

• Architect and build front-end features for a multi-tenant SaaS platform.
• Own backend integrations and data access patterns end-to-end.
• Develop a shared component library for client-scale consistency.
• Mentor junior engineers and lead code reviews.
• Ensure security-conscious development and RBAC/ABAC alignment.

Skills

Full stack

React

TypeScript

RBAC/ABAC

Tools

PostgreSQL

Firestore

Drizzle ORM

Google Cloud Platform

Job description

Foresite Cybersecurity is seeking a Senior Fullstack Engineer with a product mindset to design and scale our multi-tenant SaaS platform. You will shape human-centered interfaces and ensure secure, reliable deployments.

You will work across frontend and backend, embracing a modern stack (React 18/19, TypeScript) and collaborate with product, design, and backend engineers to ship production-ready features. You will own deployments, participate in CI/CD, and champion code quality in a fast-paced,