SDET III

Topstep

1d•$150,000 - $165,000•Hybrid

About The Position

Topstep is looking for a mid-level Software Development Engineer in Test to help ensure the quality, reliability, and performance of our web, API, mobile, and third-party integrated applications. In this role, you will work closely with Engineering, Product, and QA throughout the software development lifecycle. You will be responsible for expanding automated test coverage, supporting manual and release validation, identifying quality risks, and helping the team deliver reliable features on schedule. The ideal candidate has experience testing both web and mobile applications, understands API testing and test automation, and is comfortable working in a fast-paced, collaborative engineering environment.

Requirements

6 + years of experience in software quality assurance, test automation, or an SDET role.
Experience testing web applications, REST APIs, and mobile applications.
Hands-on experience developing and maintaining automated test frameworks.
Experience with UI, API, integration, regression, and end-to-end testing.
Understanding of software development lifecycles, Agile methodologies, and CI/CD pipelines.
Experience using API testing tools and validating request and response data.
Ability to write clear, reproducible defect reports and communicate technical issues effectively.
Experience reviewing requirements and acceptance criteria for completeness and testability.
Familiarity with source control, pull requests, build pipelines, logs, and application monitoring tools.
Strong analytical, troubleshooting, and risk-assessment skills.
Ability to work independently while collaborating effectively across Engineering, Product, and QA teams.
Strong written and verbal communication skills.

Nice To Haves

Experience with both iOS and Android testing.
Experience with mobile automation frameworks.
Experience with modern web automation tools such as Playwright, Cypress, or Selenium.
Experience with API automation and tools such as Postman, REST Assured, or similar technologies.
Experience integrating automated tests into CI/CD pipelines.
Experience testing payment processing, subscriptions, billing, financial, trading, or other transaction-based systems.
Experience validating third-party integrations and asynchronous workflows.
Familiarity with SQL, databases, logs, event-driven systems, and backend troubleshooting.
Experience with performance, load, accessibility, or security-focused testing.
Experience working in a fast-moving product and engineering organization.

Responsibilities

Ensure the quality of Topstep’s web, API, mobile, and third-party integrated applications.
Design, develop, maintain, and improve automated test coverage across UI, API, and mobile platforms.
Support manual, smoke, regression, end-to-end, integration, and production validation testing as needed.
Create and maintain test cases, test plans, test data, automation suites, and other QA documentation.
Review product requirements and acceptance criteria to identify gaps, risks, dependencies, and testability concerns before development is completed.
Validate new features and defect fixes before release and provide clear QA sign-off on release readiness.
Identify, document, reproduce, prioritize, and communicate defects to Engineering, Product, and other stakeholders.
Support production validation and assist with investigating post-release issues, regressions, and customer-impacting incidents.
Validate third-party integrations, including payment, billing, authentication, trading, and account-management workflows.
Document QA processes, testing standards, release validation steps, environment requirements, and troubleshooting guidance in Notion.
Collaborate with Engineering, Product, and QA team members to improve quality throughout the development lifecycle.
Help define and follow modern QA practices, including risk-based testing, shift-left testing, test automation, and CI/CD-supported validation.
Participate in sprint planning, refinement, technical discussions, and release-readiness reviews.
Support onboarding, mentoring, and knowledge sharing as the QA team grows.
Deliver high-quality testing within sprint timelines while clearly communicating test progress, risks, blockers, defects, and release status.