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Senior QA Engineer at mx51 - QATestingJobs.com
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Senior QA Engineer
mx51 • International Falls, Minnesota, United States
remote
Salary: 51 is a pa
Posted Jan 29, 2026
Role & seniority: QA Engineer (mid-level to senior) focused on payments platform quality for mx51.
Stack/tools: Android applications; in-store integrations with third-party POS systems; web/desktop testing; API testing (Postman); test planning, test cases, test scripts; manual and exploratory testing.
Top 3 responsibilities
Develop, maintain and execute test artifacts (test plans, cases, scripts) to ensure quality across products.
Perform functional, regression and exploratory testing; identify, log and communicate bugs to developers/product managers.
Manage and certify third-party POS integrations; liaise with engineering/product teams to mitigate risks and drive QA improvements.
Must-have skills
Experience as Test Analyst/QA Engineer in payment-related or banking/finance contexts; Android applications and/or device testing; web/desktop testing.
Proficient in test planning and end-to-end test execution; API testing with tools like Postman; ability to debug via logs.
Experience testing third-party payment integrations and POS systems; work in fast-paced agile environments; strong written and verbal communication.
Nice-to-haves
Backend/software engineering craft and contributions to production-grade microservices.
Automation/testing framework participation; adaptability to evolving QA processes; problem-solving with a proactive, collaborative mindset.
Location & work type: Australia-based fintech; flexible/work-from-home options w
Full 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.