About Mutinex

At Mutinex, we believe marketing deserves to be treated as a performance discipline — not a cost centre. We're building the growth decision engine that replaces slow, conflicted measurement with fast, independent, AI-powered intelligence. Trusted by brands like Hershey, Samsung, and Domino's, our platform empowers marketers to make confident, data-driven decisions that drive real business growth. We're an Australian-born, globally scaling B2B SaaS company — and we're just getting started.

Hybrid across Sydney, Melbourne, and New York. We highly value communication, open-mindedness, and a culture of feedback.

How We Work

The way software gets built is changing. We're changing with it — deliberately and quickly, but we're not done yet.

Our direction is clear. The hard work of engineering is shifting from implementation to planning, orchestration, and judgment. We want engineers who direct AI agents, review output, and focus their energy on the decisions that matter — architecture, design, product thinking. Writing code by hand is becoming the exception, not the default.

Here's where we are today: we use Claude Code as our primary AI development tool. We've built Forge — our internal tooling layer with shared skills, agents, and hooks that encode team knowledge. We run weekly AI Office Hours to pair on real problems. We track AI usage and change lead time to keep ourselves honest. Every engineer is expected to be actively building this skill.

Here's where we're heading: a workflow where AI handles ideation scaffolding, task breakdowns, implementation, test generation, code review prep, and release notes — and engineers focus on the thinking that AI can't do. Problem decomposition. Architectural trade-offs. Knowing when the AI is wrong and why. We're not there yet on every team, but the engineers joining now will shape how we get there.

If this is already how you work — or it's clearly where you're headed — read on.

The Role

You'll be a technical contributor building and scaling one of our core platforms: DataOS (automating data ingestion and processing) and GrowthOS / MAITE (our customer-facing growth co-pilot). The role is full-stack and moves across both. You go wherever the highest-impact work is.

What the work looks like:

You plan features with AI before a line of code exists. You break problems into stages, prompt effectively, manage context across sessions, and direct agents to build end-to-end — from backend services to the frontend that consumes them. You review what comes back with a critical eye, and you take ownership of what ships.

Specifically:

• Plan, direct, and ship end-to-end features — from data model to user interface — using AI agents as your primary development tool.

• Build and sharpen your judgment about AI output — catching hallucinated APIs, incorrect state assumptions, security patterns that look right but aren't, tests that pass but don't test what they should. Whether you're developing this skill or already strong at it, we invest in making it deeper.

• Contribute to the platform's architecture with an increasingly deep understanding of why systems are designed the way they are — so your AI direction gets sharper over time.

• Build and maintain guardrails — testing strategies, verification discipline, and review habits that keep pace with shipping velocity.

• Collaborate across product, design, data science, and engineering — because when building is fast, judgment about what to build matters more than ever.

What We're Looking For

We're hiring for how you work and how fast you're learning — not years on a resume. Some of you will bring more production experience. Some will bring more AI-native fluency. Both paths in are valid. What's non-negotiable is that you're already on the train and accelerating.

What Matters Most

• Hunger over credentials. Show us what you've built, not where you studied.

• Speed of learning over depth of experience. We'd rather see someone who shipped three AI-built projects in the last three months than someone with five years of experience who hasn't changed their workflow.

• Product sense. You think about why something should be built, not just how.

• Intellectual honesty. You know what you don't know. You ask for help. You share what you learn.

What We Invest In You

You bring AI-native fluency and hunger. We invest in building your engineering foundations — and in pushing your AI skills further than you'd get on your own.

Weekly AI Office Hours. 1:1 pairing sessions on real problems — bring a feature you're working on and we'll work through it together. Up to 4 hours every week with senior engineers.

Forge — our internal AI tooling layer. Shared skills, agents, MCP servers, and hooks built by the team, for the team. You'll benefit from what others have built and contribute your own. The engineers who lean in shape how everyone works.

Cool-down time for skill-building. Protected time built into our rhythm for experimentation, learning, and going deep on something that interests you.

Working alongside experienced engineers who've built production systems at scale and can help you build the judgment that turns AI velocity into AI quality. Your domain knowledge, architectural thinking, and production instincts will grow fast here.

Why Work With Us

You'll become a genuinely rare engineer. The combination of AI-native workflow and strong engineering foundations is scarce. We'll help you build both — fast.

Real customer impact. Your work directly shapes the platform and the success of our customers.

Challenging problems worth building fast. Complex data and infrastructure at scale — not CRUD apps.

Autonomy over tools and workflow. We don't mandate how you work. You show us what's possible.

A team that already works this way. You won't be the only one. You'll be surrounded by people pushing the same direction.

Equity ownership. All team members receive equity (ESOP).

Generous time off. 20 days annual leave to start, plus 5 extra after your first year, and 1 additional day each year after that (up to 30).

Parental leave. 12 weeks paid for the primary carer, 6 weeks for the secondary carer after 2 years.

Work from anywhere. Up to 6 weeks each year to work from anywhere in the world, with time zone crossover with Australia.

Committed to inclusion. Mutinex is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We welcome applicants of all backgrounds, experiences, identities, and abilities.

Ready?

This is a full-time permanent position.

If you've been building with AI and want to pair that with serious engineering depth — not at a bootcamp, but shipping real product at a growing company — we want to hear from you.

Send us your resume and a short note about what you've been building. Show us your workflow, your side projects, your Build Club submissions — whatever demonstrates how you work. We care more about what you've shipped than where you've worked.

We move fast on candidates we're excited about.