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 visionary Staff Software Design Engineer (SDE) in Testing Infrastructure to lead a company-wide transformation of test automation and quality engineering . In this highly visible role, you will serve as the technical lead for software testing and quality , partnering directly with Mattermost’s founders, CEO, and engineering leadership to define and execute the next evolution of our testing strategy and infrastructure. As a Staff SDE in Testing Infrastructure, you will define the technical vision and architecture for test infrastructure, frameworks, and processes , enabling every engineer to deliver high-quality, reliable software with speed and confidence. Your work will shape how the entire organization approaches testing and quality —establishing standards, designing scalable systems, and fostering a culture where quality is owned by all. You will collaborate with engineering leadership to ensure testing systems are deeply integrated, observable, and intelligent , including designing AI-driven systems that accelerate test coverage, manage test reliability autonomously, and progressively automate how tests are generated and maintained. The goal: a single successful pass of the full automated test suite provides fast feedback and a high-confidence signal of product stability so that every commit meets the bar for release.  Your impact will extend beyond infrastructure—this is a strategic, cross-functional leadership role that ensures our products meet the highest standards of reliability and security demanded by mission-critical industries such as defense, intelligence, and critical infrastructure. Responsibilities Include: Lead a company-wide transformation of test automation and quality engineering strategy, working directly with Mattermost’s founders and engineering leadership. Define and own the vision and roadmap for Mattermost’s testing and quality engineering infrastructure — from establishing strong observability and meaningful test signals, through making quality the path of least resistance, to an AI-first future where machines generate, maintain, and verify tests. Architect scalable, intelligent testing frameworks and infrastructure spanning server, web, mobile, and desktop — progressively shifting testing from manual authorship toward machine-driven generation, maintenance, and analysis. Lead the integration of AI/LLM technologies into testing strategy—from test generation and autonomous flakiness management to coverage gap detection, and beyond as the technology evolves Partner with engineering leadership to align testing strategies with product and platform roadmaps. Establish and enforce testing standards, quality metrics, and quality gates across the SDLC —  automated in CI/CD so quality is the path of least resistance. Build visibility and trust in quality signals through unified observability — dashboards, metrics, and alerting that provide actionable insight into product reliability and drive accountability. Design systems, tooling, and processes that empower developers to easily create, run, and maintain high-quality automated tests. Influence and mentor engineers to adopt shift-left testing, testability-focused design, and quality-first development practices. Drive continuous improvement by researching, evaluating, and championing emerging testing methodologies and technologies. Requirements: 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.