Senior Full-Stack Engineer (backend-heavy)

Collabify; United States; Remote; USD 33,000 - 45,000; Full time

Job summary

Collabify is seeking a Senior Full-Stack Engineer (backend-heavy) for a 4-5 month contract. This remote role involves owning the architecture and delivering the first product version for a multi-tenant SaaS product.

You will work on PostgreSQL data modeling, tenant isolation, and multiple authentication flows, with a stack including TypeScript, React/Next.js, Node.js, and PostgreSQL. 20-30+ hours/week with equity potential for the right person.

Qualifications

• Experience designing and shipping production multi-tenant SaaS architectures.
• Ability to model data and explain architectural trade-offs.
• Strong PostgreSQL experience and performance considerations.

Responsibilities

• Own architecture and lead the first product version.
• Implement tenant isolation on a shared Postgres schema with row-level security.
• Design authentication flows and subdomain-based client portals.
• Support large video uploads and ensure scalable backend.

Skills

Architecture design

PostgreSQL data modelling

Multi-tenant SaaS

System trade-offs

Tools

TypeScript

React/Next.js

Node.js

PostgreSQL

Job description

Collabify | Senior Full-Stack Engineer (backend-heavy)

REMOTE (worldwide)

Contract, 4-5 months | $3,000-4,000/month

I'm looking to hire our first engineer to own architecture and build product first version.

Stack:

• TypeScript, React/Next.js, Node.js and PostgreSQL.

Core challenges:

• tenant isolation on a shared Postgres schema with row level security
• multiple authentication flows
• subdomain-based client portals
• large video uploads.

You should have personally shipped and maintained a production multi-tenant SaaS product, have strong PostgreSQL and data-modelling experience, and be able to explain your architectural decisions and trade-offs.

Terms:

• a paid 4-5-month contract, 20-30+ hours/week, at $3,000-4,000/month, paid against agreed milestones.
• At least three hours of daily overlaps.
• For the right person, there's potential to continue in a founding role with equity.

Process:

• a short application, a live walkthrough of something you've built, then a paid 2-3hr tenant-isolation exercise and a 30-minute discussion.

Public source code isn't required. Please don't share confidential employer or client material.