Senior Full Stack Engineer

Our client is a mission-driven company building an HR and fintech platform that modernizes employee benefits and enables transparent, trackable social-impact funding. Tech stack • Front-end: Next.js + React (PWA), component-driven UI, responsive/mobile-first build • Back-end: Node.js with Firebase (Auth, Firestore, Cloud Functions), event-driven/serverless patterns • Payments: Stripe Billing + Stripe Connect (subscriptions, invoicing, payouts, webhook handling) • Infrastructure: AWS / Vercel / Docker (deployments, environments, monitoring/logging as needed) What you'll build • A multi-tenant platform supporting employers, employees, vendors, and admins with clean tenant boundaries • Secure authentication + role-based permissions across all user types (least-privilege by default) • Wallet / ledger-like flows: transactions, allocations, payouts, and automated fund routing rules • Admin + employer dashboards covering transactions, payouts, usage metrics, and audit-friendly history • A reliable delivery process: deployment pipeline, QA/testing habits, and clear internal documentation Responsibilities • Own the MVP build end-to-end, delivering against milestones and release targets • Implement secure auth, RBAC/permission models, and safe data access patterns • Build payment and payout workflows end-to-end (Stripe Billing/Connect), including webhooks, retries, and edge cases • Develop reporting and operational dashboards to support finance/ops visibility • Manage deployments and environments, plus testing/QA and documentation to enable repeatable releases • Work closely with the Founder and Senior Technical Advisor on architecture, security, and pragmatic tradeoffs Requirements • 4–5+ years building full-stack products with React/Next.js and Node.js • Strong hands-on experience with Stripe Billing and/or Connect (or equivalent) in production • Experience with Firebase (Auth/Firestore/Functions) or similar serverless stacks • Strong Git/GitHub workflow; produces clean, maintainable code with sensible test coverage • Clear written communication, strong ownership, and dependable remote collaboration Nice to have • Experience in HR tech, fintech, or SaaS platforms with admin dashboards • PWA experience (offline-first considerations, performance, mobile UX) • Exposure to accounting/finance integrations (QuickBooks, Xero, Netsuite, etc.)