Senior Software Engineer

Software Engineer - Engineering Team

About Mutinex

Mutinex is an early-stage B2B SaaS startup with a proven platform, big-name clients, and millions in revenue. We help marketers understand their ROI and make smarter decisions with their budget. Our vision is to build a sustainable, long-lasting business—think Bowhead Whale! .

We are a hybrid team based in Sydney, Melbourne, and New York. We highly value communication, open-mindedness, and a culture of feedback.

The Role

As a Software Engineer on the Engineering team, you will be a key technical contributor responsible for building and scaling our core platforms, including DataOS (for automating data ingestion and processing) and GrowthOS / MAITE (our customer-facing growth co-pilot).

This role is inherently full-stack . You'll have the opportunity to work across our entire technology stack, contributing to frontend applications to deliver complete, end-to-end features for our users. You will apply first-principles software engineering to complex data challenges, taking ownership of high-impact domains within a fast-growing, product-led startup.

Senior Software Engineer

The Senior role involves high-impact ownership and technical leadership :

Platform Architecture and Development : Play a key role in steering the technical design and development of our platforms. You will architect new features, evolve the platform's architecture for scalability and maintainability, and uphold the highest standards of code quality.

Building Scalable Systems : Drive engineering efforts to scale our data processing and warehousing solutions , including performance engineering, optimizing distributed systems, and designing infrastructure to handle large data volumes efficiently.

Collaboration and Mentorship : Share expertise, champion best practices through code reviews, and provide technical guidance to the team.

What We're Looking For

We believe skills can be developed—so if you bring a unique perspective and are eager to learn, we’d love to hear from you.

Strong Software Engineering Foundation : Experience building and maintaining production-grade backend systems and services. You should be familiar with software engineering principles like SOLID and design patterns, and committed to building testable, maintainable code. Your experience should be in software, applied to the data domain.

Experience Building Data-Intensive Applications : Proven track record of designing, building, and scaling complex, data-intensive systems in the cloud. You understand the unique challenges of distributed systems, concurrency, and handling large data volumes.

Full-Stack Flexibility / Capabilities : Experience with or a strong willingness to work on modern frontend frameworks (we use React ). You understand that a great data product requires an accessible and useful user experience.

• Modern Tech Stack : Hands-on experience with modern cloud infrastructure (we use GCP ) and infrastructure-as-code (e.g., Pulumi, Terraform)

DataOS Focus : Core strength in a general-purpose language like Python or Go .

GrowthOS Focus : Core strength in languages such as Typescript , Javascript or any other strongly typed language. We also use Python on the Data platform side.

A Passion for the Craft : You see software engineering as a craft and take pride in your work. This translates into a commitment to building high-quality, reliable, and well-tested software that is clean and maintainable.

Growth Mindset : Eager to learn, take on new challenges, and deepen your technical expertise and impact.

Proactive Problem-Solver : You don't just fix bugs; you identify the root cause and improve the system to prevent future issues.

Why Work With Us?

Real Customer Impact : Your work directly shapes our platform and the success of our customers

Challenging, Meaningful Work : Tackle complex data and infrastructure problems at scale.

Autonomy and Ownership : Drive initiatives end-to-end with support when you need it

Learning and Growth : Collaborate with a thoughtful team of engineers and data scientists who love what they do

Equity Ownership : All team members receive equity ( ESOP ).

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

Parental Leave : 12 weeks paid leave for the primary carer, and 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 aus.

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 to Join Us?

If this sounds like a place where you'd thrive, we'd love to hear from you. Send us your resume and a short note about why this role excites you—we care more about what drives you than perfect formatting.

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