◆Posted Sep 6, 2025

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.

Apply Now

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

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