Software Developer in Test (SDET)

About the Role

• We're looking for a Senior Quality Engineer to join the Product Launch Team at a U.S.-based design marketplace that connects independent artists with a global audience. You'll own the automated testing strategy for complex, multi-layered applications — ensuring reliability and integrity across web UIs, APIs, microservices, and end-to-end data flows.
• This is a highly technical role for someone who brings both automation depth and the judgment to know when manual exploratory testing is the right call.

About You

• You have 7+ years in Software Quality Engineering and have owned automated testing strategies end-to-end across distributed systems.
• You think in systems — you understand how data flows across microservices and third-party integrations, and you design tests that reflect that complexity.
• You're as comfortable writing a test plan for a non-technical stakeholder as you are architecting a testing solution for an asynchronous event pipeline.
• You advocate for quality early in the development cycle and work closely with engineers and product managers to catch issues before they ship.
• You balance automation rigor with pragmatic exploratory testing when the situation calls for it.

What You'll Be Doing

• Design and implement comprehensive automated test suites for distributed systems, validating data flows across microservices and third-party integrations — both in isolation and end-to-end.
• Develop and maintain automated tests for RESTful APIs and service-to-service integrations, ensuring contract compliance and data integrity.
• Architect testing solutions for asynchronous data flows and message brokers, validating that data triggers and transformations occur accurately across the pipeline.
• Validate high-complexity internal tools involving long-running backend processes such as large-scale file uploads and multi-stage data processing.
• Lead automation initiatives while complementing them with manual exploratory testing for comprehensive product coverage.
• Collaborate with Software Engineers and Product Managers to understand architectural shifts and provide early feedback through shift-left testing practices.

What We're Looking For

• A systems thinker who anticipates failure modes before they happen and designs tests that reflect real-world complexity.
• Strong communication skills — you can translate technical test plans for both engineering and non-technical stakeholders.
• A proactive approach to quality: you move left, not right.
• Comfort working across new and legacy systems without losing rigor.

Technical Requirements

Must-Haves

• :
• 7+ years in Software Quality Engineering, with 4+ years in functional test automation (web UI and/or APIs) and 2+ years in API and data test automation.
• Proven experience with testing frameworks such as Playwright, Cypress, Selenium, or PyTest.
• Expertise in API testing using Postman, PyTest, or similar tools.
• Hands-on experience with message queues or event streams, and proficiency in SQL for data inspection and verification.
• Proficiency in Python and/or JavaScript with a solid understanding of object-oriented programming principles.
• Deep understanding of multi-layered, distributed architectures (microservices, SOA, MFE) and data flow patterns.
• Experience testing integrations with third-party vendor systems.

Nice-to-Haves

• :
• Experience with large-scale e-commerce or marketplace platforms.
• Familiarity with performance or load testing in distributed environments.
• Background working in cross-functional product teams with agile methodologies.