Software Development Engineer in Test

Role Overview

The Intermediate to Senior Software Development Engineer in Test (SDET) at League drives product quality by combining strong engineering practices with hands-on testing. You will design and build scalable test automation frameworks for mobile and web, complementing them with manual and exploratory testing for edge cases. You will work cross-functionally with engineering and product to ensure quality is embedded throughout the development lifecycle.

Responsibilities

Test Framework & Infrastructure

• Design, build, and maintain scalable test automation frameworks from scratch:
  • iOS/Android (Appium, Espresso, XCUITest)
  • Web (Playwright / Selenium)
• Create reusable testing assets, including:
  • test libraries
  • data builders
  • mocking utilities
• Add observability to test pipelines (e.g., flakiness dashboards, coverage reports, failure triage tooling).

CI/CD Integration & Shift-Left Quality

• Integrate automated test suites as quality gates in CI/CD pipelines (e.g., GitHub Actions, CircleCI).
• Participate in design/architecture reviews to identify testability risks early.
• Influence API contracts, feature flags, and observability hooks.
• Collaborate with DevOps/Platform to enforce test environment parity between staging and production.

Test Strategy & Execution

• Own end-to-end test strategy for product areas, including:
  • functional, integration, E2E, regression
  • performance
  • contract testing
• Write/review/maintain test plans and test cases across iOS, Android, and Web.
• Lead peer reviews for test code and coverage quality.
• Perform exploratory, risk-based testing to uncover issues beyond scripted scenarios.

Quality Advocacy & Defect Management

• Serve as quality owner for one or more delivery squads; track progress and surface quality risks.
• Triage and prioritize defects in Jira with reproduction steps, severity, and root-cause analysis.
• Analyze automated test results to separate real failures from infrastructure noise and drive remediation.
• Mentor others on automation best practices and clean, maintainable test code.

Requirements

• 4+ years in software development and/or quality engineering with a strong emphasis on test automation.
• Proven ability to design and implement automation frameworks from scratch.
• Hands-on programming proficiency in TypeScript/JavaScript, and preferably experience with one or more:
  • Swift (mobile)
  • Python
  • Java or Kotlin
• Deep hands-on mobile testing experience on real iOS and Android devices.
• Experience with Appium, XCUITest, or Espresso.

Nice-to-haves / Additional signals

• Experience integrating automated tests into CI/CD (quality gates).
• Experience with observability for test reliability (flakiness, coverage, triage).
• Experience with contract testing and test environment parity practices.