Job Description

Senior Full Stack Engineer - Scale-Up
📍 Sydney (Hybrid: 2 days in office)
💰 Up to $200K + Super + Shares

Are you a hands-on engineer who thrives in fast-moving environments and enjoys juggling multiple projects at once? This is your chance to join a growing scale-up with consistent revenue growth, where you’ll take ownership of projects end-to-end and have a direct impact on product direction.

As a Senior Engineer, you’ll be part of a collaborative, flat-structured team where everyone rolls up their sleeves to make things happen. You’ll work across product development, data engineering, and deployment - switching between priorities as business needs evolve-so curiosity, adaptability, and problem-solving matter more than any one framework or language.

Why join?

• Tackle diverse challenges: Work on 3-4 projects at a time, spanning new product features, infrastructure improvements, and data pipelines that drive better decision-making.

• Shape a high-growth product: With demand accelerating, you’ll be building at pace and constantly adapting to evolving business conditions.

• Own your work end-to-end: From design through to delivery, you’ll have the autonomy to build solutions that create real impact.

• Bring your polyglot mindset: We value engineers who are language-agnostic, excited to learn, and motivated to pick the right tool for the problem.

You’ll thrive in this role if you:

• Have 8+ years’ experience in software engineering, with strong backend foundations but openness to working across the full stack.

• Enjoy variety and are energised by working on multiple projects at once.

• Value open communication, collaboration, and knowledge sharing.

• Take a proactive, solutions-first approach to complex technical challenges.

This is a role for engineers who see themselves as builders and problem-solvers first, tech stack specialists second - a chance to shape both the product and the future of the company.

Sounds like your next role? Reach out to Monica@theonset.com.au