mx51
mx517h ago
New

Senior Backend Engineer

AustraliaAustraliaRemotesenior
OtherSenior Backend Engineer
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Quick Summary

Overview

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,

Technical Tools
OtherSenior 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.

  • 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.
  • 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

~1 min read

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

Location & Eligibility

Where is the job
Australia
Remote within one country
Who can apply
AU

Listing Details

Posted
July 9, 2026
First seen
July 9, 2026
Last seen
July 9, 2026

Posting Health

Days active
0
Repost count
0
Trust Level
68%
Scored at
July 9, 2026

Signal breakdown

freshnesssource trustcontent trustemployer trust
mx51
mx51
greenhouse

mx51 is a fintech based in Sydney focused on providing payment solutions that empower payment providers to enhance merchant experiences.

Employees
125
Founded
2020
Domain
mx51.com
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mx51 Senior Backend Engineer