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

At Mattermost, we build the #1 collaborative workflow solution for defense, intelligence, security, and critical infrastructure organizations. Trusted by governments, financial institutions, and technology companies, our platform enables secure, efficient operations for the world’s most critical teams.

We’re dedicated to empowering organizations to operate with confidence, reducing risks, and accelerating productivity. Guided by our core values of Customer Obsession, Earn Trust, Self Awareness, Ownership and High Impact, we collaborate closely with our customers to deliver solutions that meet complex needs and drive success.

To learn more, visit www.mattermost.com

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

• 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.

        Salary Range

        $137,000 - $165,000 USD

        Mattermost is an EEO Employer, we are a remote-first, open-source company.

         

        We are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time.

         

        Mattermost values your unique perspective—we welcome all applicants. We encourage individuals from all backgrounds to apply and are committed to assessing candidates based on their skills and qualifications. We do not tolerate discrimination against staff or applicants based on race, religion, national origin, age, disability, pregnancy status, veteran status, or other personal characteristics.

         

        If you require accommodations during the interview process, please let us know—we’re happy to assist.