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 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. 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.

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