Software Development Engineer in Test (SDET) – Deployment Engineering Solutions

Mattermost is seeking a versatile and detail-oriented SDET (Software Development Engineer in Test) to support the delivery of high-impact, single-solution software components and plugins tailored to enterprise customer needs. You will be embedded with our deployment engineering team, working on fast-turnaround projects that require robust quality assurance under tight timelines. 

This role encompasses a mix of manual QA, unit testing, and end-to-end test automation, with an emphasis on delivering production-ready solutions in collaboration with engineers, product managers, and customers. 

This is a full-time contractor role with the possibility of extension based on project needs and performance.

What You’ll Do 

• Design and maintain manual test plans and automation suites for plugins and specialized solutions. 

• Implement end-to-end tests using Playwright, covering real-world workflows and user interactions. 

• Validate unit-level functionality and contribute to automated test coverage in CI pipelines. 

• Perform manual testing of new features, regression testing for releases, and validation of bug fixes. 

• Review pull requests for QA implications and test coverage, and execute test cases accordingly. 

• File clear, detailed, and reproducible bug reports using GitHub and collaborate on resolution. 

• Participate in team standups and planning sessions to define QA scope and ensure alignment. 

• Help define and document the QA process, best practices, and future improvement areas. 

Key Technologies 

• JavaScript/TypeScript 

• Playwright 

• GitHub / GitHub Actions 

• CI/CD tools 

• Mattermost platform and plugin architecture 

Must-Have Qualifications 

• 3+ years of hands-on experience in automated and manual testing of modern web applications. 

• Proficiency with Playwright or similar E2E automation tools (e.g., Cypress, Selenium). 

• Solid understanding of QA processes, including test planning, execution, and reporting. 

• Ability to assess technical changes and create effective unit and integration test strategies. 

• Experience working within cross-functional engineering teams in agile environments. 

• Excellent communication and documentation skills.
  
  
• For candidates residing in the U.S.: This role may require the ability to obtain and maintain a U.S. government security clearance in the future. As such, U.S. applicants must be U.S. citizens and eligible under applicable clearance requirements.
  
  
• Applicants must meet eligibility requirements for access to export-controlled information as defined by U.S. export control laws, including EAR and ITAR

Nice-to-Have 

• Experience testing third-party integrations or plugin-based architectures. 

• Familiarity with enterprise software, access controls, or secure collaboration tools. 

• Background in open-source software or contributing to GitHub repositories. 

• Experience in deployment engineering and customer-focused development teams. 

Engagement Scope 

You will: 

• Join deployment engineering team building plugins and tailored solutions for enterprise customers. 

• Ramp up on testing strategies, tools, and processes in Week 1. 

• Support both manual and automated testing from Weeks 2 through 6, with deliverables including test plans, bug reports, and submitted PRs for automation. 
  
  
• Contribute to defining a QA process playbook for future projects. 

Mattermost takes a market-based approach to pay and pay may vary depending on your location. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.