About the Project Im building a modern multi-tenant SaaS platform with real-time communications, subscription billing, and usage-based metering.
The foundations are in place, but I need a senior engineer who can help stabilise, refine, and extend the platform.
This role is for someone who understands scalable SaaS architecture, can work within an existing codebase, and is comfortable taking ownership of technical quality.
Backend: Node.js, TypeScript, Express Frontend: React, Vite, Tailwind Database: PostgreSQL (multi-tenant patterns, row-level scoping) Billing: Stripe (subscriptions + usage-based reporting) Comms: Twilio (voice + messaging integrations) Infrastructure: Vercel + Render, CI/CD pipelines Strengthening and stabilising billing flows (subscriptions, metered usage reporting, webhook safety, idempotency).
Refining API layers, improving tenant isolation, and tightening data integrity.
Improving the ingestion pipeline for communications + metered events.
Enhancing admin tools, dashboards, and workflow UX.
Hardening CI/CD, adding meaningful tests, improving reliability and deployment confidence.
Deep experience with TypeScript, React, Node.js, PostgreSQL .
Proven background in building or maintaining SaaS platforms .
Strong understanding of Stripe billing (including usage-based billing).
Production experience with Twilio or similar comms APIs.
Solid architectural instincts: idempotency, tenant isolation, race condition prevention.
Ability to work inside an existing codebase without breaking it.
Clean communication, no ego, reliable delivery.
Experience with multi-tenant Postgres (row-level security, schema strategies).
Background with AI/LLM integrations.
Test-driven or at least test-minded development.
Experience stabilising or refactoring a growing SaaS product.
Youre a senior engineer who can solve problems without being handheld.
You dont melt down over inherited code you stabilise it.
You can clearly explain architectural tradeoffs and propose solutions.
You treat reliability, billing correctness, and data safety as non-negotiables.
Youre looking for long-term collaboration if the fit is right.
Hourly, competitive rates depending on proven experience.
**** hrs/week to start.
Long-term work available for the right fit.
Please include:
1. A short intro.
2. Your experience specifically with: Stripe metered billing Twilio integrations Multi-tenant SaaS
3. Links to relevant repos or project walkthroughs (no client code needed).
4. Your availability and hourly rate .
No agencies.
Only individual senior engineers.