Staff Performance Engineer

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 an expert in Go and PostgreSQL to help us reach new levels of performance, scale and reliability for our many mission-critical customers. Often this means anticipating performance issues with incoming features and steering the team in a better direction. Sometimes this means proposing new architectural changes to make things simpler, more manageable, or just plain faster. And occasionally this means deep diving into a customer escalation to identify the root cause, fix it, and up-level our organisation to prevent this from ever happening again.

As a Staff Software Engineer, you will play a pivotal role in driving core architectural improvements to the open-source Mattermost monorepo, written in Go. You will continuously identify opportunities to improve deployment processes and refine best practices, collaborating with other engineering and product teams to share knowledge and learnings. Your expertise will also be crucial in assisting Customer Success and Support teams with troubleshooting and incident response. Your contributions to our open-core platform using your personal GitHub account will empower the broader developer community while leaving a lasting professional legacy.

The person in this role will join a fast-paced, flexible full stack team responsible for developing and delivering impactful features and systems that empower collaboration for the world’s most critical organisations. Do you have a passion for designing and developing high-impact products? Do you want to work with a well-oiled, collaborative and highly senior team? Do you want to make an impact on open source? Help us build and grow one of the largest React and Go open-source projects.

Responsibilities include

• Proactively find issues affecting performance, scale and reliability, and drive solutions across engineering directly into customers’ hands
• Help define a best-of-class architecture not only for the core product, but also our comprehensive load testing tool, wide array of plugins, and burgeoning audio/screensharing Calls product
• Mentor the existing server backend team, technical account managers, and customer support managers to find and resolve issues for themselves
• Take ownership of our experimental support for caching with Redis and expand adoption both internally within engineering and externally with customers
• Lead by example in code quality, and teach by giving high-quality code review feedback
• Identify gaps in our testing strategy and developer experience to unblock and accelerate all of engineering

Required Background/Skill

• BS in Computer Science, Computer Engineering, or related field/experience
• 3+ years writing and tuning highly performant HTTP/WebSocket applications written in Go
• 3+ years both developing for PostgreSQL and tuning PostgreSQL deployments for scale and performance
• Expertise in shaping architectural decisions and driving technical direction for complex, high-impact projects
• Experience developing with AI-assisted development tools (such as Claude Code)
• Solid understanding of modern development workflows, including CI/CD, E2E testing, distributed systems, and cloud infrastructure
• Strong written and verbal communication skills suitable for diverse audiences
• Capable of working independently across multiple time zones while actively engaging in team collaboration

Preferences

• Experience with Grafana, Prometheus, and other performance monitoring tools
• Experience with audio/visual/networking/WebRTC
• Experience contributing to open-source projects
• Experience with end-to-end testing frameworks such as Playwright and/or Cypress
• Expertise in defence, intelligence, or security-focused workflows
• Has worked fully remotely with global teams

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.

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.