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Senior QA Engineer

Mx51

International (remote) (Remote, AU) Remote permanent

Posted: January 29, 2026

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Job Description

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 QA Engineer at mx51, you'll ensure our platform meets the exacting standards of Australia's leading financial institutions. Working closely with our Engineering team, you'll drive quality initiatives and shape the reliability of critical payment solutions.

We’re looking for a versatile and driven QA Engineer to join our team. In this role, you will support the delivery of our payment products and solutions through functional and exploratory testing, whilst working closely with other teams such as Engineering, Product and Delivery.

You will get to work on a mx51’s InStore products ranging from Android Applications to Integration solutions with third party Point-of-Sales (POS) systems. You will perform manual and explorative tests to ensure product quality across our in-store products, ranging from integration with third parties to Android applications and dashboards.

This is a great opportunity for someone keen to join a high-growth fintech, has an interest in tech and payments, and likes the autonomy to actively contribute to QA ways of working.

Responsibilities

In this role, you will be responsible for:

• Develop, create, execute and maintain test cases, test plans, test scripts and other QA documentation to ensure that all products, software applications, and systems are thoroughly tested

• Performing thorough functional, regression and exploratory testing of mx51’s products

• Identifying, recording and communicating bugs to developers and product managers

• Managing and testing third-party POS products through certification

• Liaising with internal development and product teams to identify potential product risks, limitations and improvements

• Continuously improve the QA process and procedures to ensure that products, software applications, and systems meet the highest standards of quality and performance

• Work closely with the development team to ensure that all products, software applications, and systems meet design specifications and customer requirements

About You

• Experience as a Test Analyst or QA Engineer particularly in testing Payment products, device testing and/or Android applications (banking, finance or EFTPOS terminals)

• Experience in testing both web-based and/or desktop applications

• Experience with test planning and managing test execution for products/systems, and managing end-to-end testing

• Experience in API testing using tools such as Postman

• Ability to debug and troubleshoot issues independently via logs

• Experience testing third-party payment integrations and point-of-sale systems

• Experience working in a fast-paced agile environment

• Communication - you will be effective in your written and verbal communication when interacting with your team and other stakeholders across the business

• Problem solving - you will be open-minded, curious, and adopt a ‘seek to understand’ approach when tackling people-related challenges

• Expertise - You love the software engineering craft and in particular back end development. You have significantly contributed to the engineering of production-grade microservices

• Adaptability - you adapt quickly to changes within the business environment, and positively champion these changes to your team

• Values - you will strive to model the mx51 values at all times and across all aspects of your role.

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.

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