Freelance SaaS Engineer: Code Review, Launch & Security

Twine; Adelaide; Hybrid; AUD 120,000 - 180,000; Full time

Job summary

Twine is seeking an Australia-based engineer to lead a compliance SaaS project. You will review code health, fix critical bugs, and build demo/demo landing pages while integrating privacy and terms content.

The role emphasizes multi-tenant security, backups, error monitoring, and data privacy. Initial work is a paid code review, followed by implementing launch priorities, demo accounts, and a public pricing page.

Qualifications

• Proven experience with Next.js (App Router), React, TypeScript, Supabase, Stripe, Playwright, and Vercel in production environments.
• Demonstrated ability to take over and improve undocumented SaaS codebases.
• Expertise in Supabase row-level security and multi-tenant SaaS architecture.
• Strong understanding of Stripe subscriptions, webhooks, and payment integration.
• Experience with error monitoring, backup strategies, and privacy best practices.
• Ability to deliver clear, actionable code reviews and technical documentation.

Responsibilities

• Conduct a comprehensive code review and provide a plain-English report on code health, risks, and launch priorities.
• Fix expiry-date status bug and ensure accurate status handling.
• Create a realistic fictional demo account for demonstration purposes.
• Build a public-facing pricing and sign-up landing page.
• Integrate supplied privacy policy and terms of service content.
• Review and enhance multi-tenant isolation, Supabase row-level security, backup strategies, error monitoring, and email privacy.
• Implement reliable recurring tasks that regenerate on schedule without duplicates or gaps.
• Develop a browser-only CSV/Excel analysis tool with parsing and charting, ensuring no uploaded data is retained.
• Collaborate under NDA and IP assignment, with all code and infrastructure remaining client-owned.

Skills

SaaS codebase improvement

Next.js

React

TypeScript

Supabase

Stripe

Playwright

Vercel

Tools

Next.js (App Router)

React

TypeScript

Supabase

Stripe

Playwright

Vercel

Job description

Twine is seeking an Australia-based engineer to lead a compliance SaaS project. You will review code health, fix critical bugs, and build demo/demo landing pages while integrating privacy and terms content.

The role emphasizes multi-tenant security, backups, error monitoring, and data privacy. Initial work is a paid code review, followed by implementing launch priorities, demo accounts, and a public pricing page.