Senior Backend Engineer

mx51 is a payments-as-a-service solution for banks, non-bank acquirers, and other merchant service providers. We are building a payment platform that allows merchants to accept payments in-store, in-app and online, whilst consolidating all their data on a real-time business management dashboard.

As a Senior Engineer within the mx51 Backend team, you will be instrumental in delivering key projects for the business, playing a vital role in developing our platform, which is used by businesses to take payments across Australia.

In this role, you will:

• Build and maintain high-throughput, fault-tolerant microservices in Go that power our backend.


• Design technical solutions to meet our customer needs.


• Shape data models and optimise queries for our PostgreSQL databases.


• Champion code quality through code reviews, testing, and refactoring.


• Work closely with product, design, and other engineering teams to deliver solutions our customers love.


• Keep an eye on emerging tech and best practices, and bring good ideas back to the team.


• Champion AI tooling and automation to improve quality and remove bottlenecks.

About You

• You're eager to learn, happy to share what you know, and open-minded when facing challenges.


• You enjoy software engineering, especially back-end development. 


• You have good experience building production-grade microservices.


• You embrace change and help bring your team along positively.


• You care as much about the product and the user as you do the code.


• You're curious about using AI to work smarter.


• You strive to uphold the mx51 values.

What we offer

You will be joining an incredible team who are committed to our vision and company values. Our innovative culture gives you opportunities to make real contributions that will shape the future of the business. In addition to a fun and flexible work environment, we also offer:

• Work from overseas up to 4 weeks per year


• Annual team offsite


• Social events run by our social committee


• Swap a public holiday and take an alternative day off


• Paid leave for volunteering


• Employee Share Option Plan (subject to invitation)


• Paid parental leave for primary and secondary carers


• Novated lease and salary sacrifice options

mx51 is an equal opportunity employer that is committed to creating a diverse and inclusive environment. All qualified applicants will receive consideration for this role without bias to race, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability or age.

Note: mx51 does not accept unsolicited resumes or applications from recruitment agencies.