Staff Software Development Engineer In Test

Poshmark is the leading fashion marketplace where style comes alive through discovery, self-expression, and human connection. Powered by a vibrant community of 165 million members, Poshmark brings real people and taste to shopping through a social experience shaped by shared discovery. Buying and selling fashion feels simple, joyful, and personal, while every item tells its own story. Poshmark empowers sellers to grow meaningful businesses, keeps fashion in circulation longer, and gives shoppers access to unique and trusted finds, from everyday pieces to one-of-a-kind vintage and luxury.

We are looking for a Staff Software Development Engineer In Test (Staff SDET) who will define, design, and drive the automation and quality engineering strategy across Poshmark. You will take a hands-on leadership role in building scalable test automation frameworks and infrastructure while partnering closely with Engineering, Product, and QA Engineering teams.

You will have a significant impact on the quality of Poshmark’s growing products and services by creating the next generation of tools and frameworks that enable faster development, better testability, and higher confidence releases. You will influence software design, promote strong engineering practices.

Responsibilities

• Test Harnesses and Infrastructure: Design, implement, and maintain scalable test harnesses and testing infrastructure for web, mobile (iOS & Android), and APIs. Own the long-term architecture and evolution of automation frameworks. Leverages AI-assisted tools to improve test design, increase automation coverage, and reduce manual effort across web, mobile, and API testing.

• Automation Framework Leadership: Lead the design, enhancement, and optimization of automation frameworks using tools such as Selenium, Appium, Postman, and AI-driven solutions. Ensure frameworks are reliable, maintainable, and scalable, while establishing and enforcing strong coding and testing standards through regular code reviews.

• Product Quality and Engineering Partnership: Actively monitor product development and usage to identify quality gaps and risks. Partner with developers to improve testability, prevent defects, and integrate testing early in the development lifecycle. Embed automation into CI/CD pipelines to enable continuous testing and rapid feedback

• Metrics, Reporting, and Continuous Improvement: Define and track quality metrics such as automation coverage, defect trends, and execution stability. Create automated reporting solutions to support data-driven quality decisions. Continuously improve testing processes, tools, and workflows across teams

• Leadership and Mentorship: Mentor and guide the team on automation best practices and framework design, while translating complex initiatives into clear, actionable goals that enable effective execution.

6-Month Accomplishments

• Stabilize and enhance existing automation frameworks to improve reliability and execution consistency

• Uses AI-driven insights to continuously optimize test coverage, execution efficiency, and defect detection effectiveness.

• Collaborate with development teams to add new capabilities to the automation framework

• Ensure regular, stable execution of regression tests across multiple platforms

• Identify and resolve high-impact quality issues early in the development cycle

12+ Month Accomplishments

• Establish a scalable, future-ready automation architecture deeply integrated with CI/CD pipelines

• Guide the team in adopting AI-assisted testing practices that complement existing automation frameworks and quality processes.

• Lead efforts to optimize test execution time through parallelization and smarter automation strategies

• Mentor and grow a high-performing automation team with clear technical standards

• Drive measurable improvements in product quality and reduction of production defects

Qualifications

• 6+ years of experience in software testing with a strong focus on test automation

• 4+ years of hands-on programming experience using languages such as Python or Java

• Proven experience designing and scaling automation systems for web, mobile, and APIs

• Strong expertise with frameworks and tools such as Appium, Selenium, WebDriver, and CI/CD systems

• Strong knowledge of Data Structures and Algorithms, with the ability to apply them to build efficient and scalable automation solutions.

• Experience across all phases of automation including GUI and integration.

• Hands-on experience with Jira, Confluence, GitHub, Unix commands, and Jenkins

• Excellent communication, problem-solving, and technical leadership skills