Senior Software Engineer in Test

The role

You will own end-to-end quality verification and validation for complex production systems, from design through release. You will design test strategies, build automation for backend and frontend, and help shape how standards evolve.

What you will do

• Own end-to-end quality verification and validation for complex systems, from design through production.
• Design and execute test strategies with a focus on edge cases, failure modes and real-world scenarios.
• Build and maintain automation frameworks for backend (API, integration) and frontend (UI, end-to-end) testing.
• Identify gaps in test coverage and system behavior.
• Drive root cause analysis and contribute to prevention strategies for defects and incidents.
• Apply the same verification and validation rigor to AI- and agent-produced work as to human-written code.
• Improve test efficiency, reliability and execution speed.
• Mentor team members and raise quality standards across the team.
• Partner with engineers, design, product managers and stakeholders to build quality in.
• Help shape how verification and validation standards evolve as the engineering model matures.

Required qualifications

• 8+ years of experience in quality engineering, QA automation or SDET roles, with ownership of complex production systems.
• Strong critical thinking to identify edge cases, failure scenarios and subtle bugs.
• Deep understanding of testing strategies (unit, integration, E2E, contract, regression).
• Strong programming skills (preferably TypeScript, JavaScript or similar).
• Experience building automation frameworks for backend/API and frontend/UI testing (e.g., BrowserStack, Playwright, Cypress, Selenium, Appium).
• Experience with CI/CD integration and test pipelines.
• Familiarity with mocking, stubbing and test data management.
• Strong debugging and problem-solving skills, with an understanding of system architecture.
• A proactive, prevention-focused mindset.
• Proven experience using AI-assisted development tools across testing, debugging and problem-solving.
• Ability to evaluate emerging AI capabilities for engineering workflows.
• Comfort operating in ambiguity and fast-paced environments.

Nice to have

• Experience with performance testing, BDD frameworks or microservices architectures.
• Experience working in high-scale or fintech environments.

Benefits

• Flexible working culture
• Incentive programs
• Unlimited PTO
• Generous paid parental leave
• Leading family support policies
• Company-sponsored 401k match
• Learning and wellness subscription stipend
• Casual dress code at the Union Square office
• Industry-leading employer-sponsored insurance for you and your dependents, with several 100% Zip-covered choices

Before you apply

• Visa sponsorship is not available for this position.
• Zip participates in the federal government's E-Verify program.

About the company

Zip Co Limited (ASX: ZIP) is a digital financial services company offering point-of-sale credit and digital payment services in Australia, New Zealand and the US. It connects millions of customers with a global network of tens of thousands of merchants.