Mattermost builds the #1 collaborative workflow solution for defense, intelligence, security, and critical infrastructure organizations.

Mattermost, the leading collaborative workflow solution for critical organizations, is seeking a Staff Performance Engineer to elevate their platform's performance, scale, and reliability. This role combines deep technical expertise in Go and PostgreSQL with strategic architectural leadership. You'll be working on one of the largest React and Go open-source projects, directly impacting how defense, intelligence, and security organizations operate.

As a Staff Performance Engineer, you'll be instrumental in shaping the architecture of both the core product and auxiliary systems like load testing tools and the Calls product. Your responsibilities span from proactive performance optimization to mentoring team members and driving technical excellence. The role requires expertise in performance tuning, system architecture, and a proven track record of solving complex technical challenges.

The position offers the opportunity to work with cutting-edge technologies including Go, PostgreSQL, and Redis, while contributing to an open-source platform used by governments and financial institutions worldwide. You'll be part of a remote-first culture that values customer obsession, trust, and high impact. The ideal candidate combines technical depth with strong communication skills and the ability to work effectively across global time zones.

This is an excellent opportunity for a senior technologist who wants to make a significant impact on mission-critical systems while working with a highly skilled, collaborative team. Your work will directly influence how some of the world's most critical organizations collaborate and operate securely.

Staff Performance Engineer position at Mattermost focusing on Go and PostgreSQL optimization for mission-critical collaborative workflow solutions.

Staff Performance Engineer

Mattermost, the leading collaborative workflow solution provider for critical organizations, is seeking a Product Security Engineer to join their Security team. This role combines software engineering with security expertise, focusing on ensuring the security of Mattermost's products and services. The position offers the opportunity to work with a globally distributed team in a remote-first, open-source company environment.

The ideal candidate will play a crucial role in implementing application security tooling and processes across the company. They will be responsible for conducting security reviews, threat modeling, and providing security guidance to development teams. With a required background in Computer Science or related fields and 3+ years of experience, the role demands both technical expertise in security practices and strong communication skills.

Working at Mattermost means joining a company that values Customer Obsession, Earn Trust, Self Awareness, Ownership, and High Impact. The organization serves prestigious clients including governments, financial institutions, and technology companies, making this an opportunity to impact critical infrastructure security at a global scale.

The position offers a market-based compensation approach, varying by location and experience. As an EEO Employer, Mattermost welcomes diverse perspectives and backgrounds, maintaining a strong commitment to creating an inclusive work environment. The remote-first nature of the role provides flexibility while working on meaningful security challenges in an open-source context.

Product Security Engineer position at Mattermost, focusing on application security, vulnerability management, and secure software development practices in a remote-first environment.

Product Security Engineer

Mattermost, the leading provider of collaborative workflow solutions for critical organizations, is seeking a Staff Performance Engineer to elevate their platform's performance and reliability. This role combines deep technical expertise in Go and PostgreSQL with strategic architectural leadership.

The position offers a unique opportunity to impact a significant open-source project while working with mission-critical systems used by defense, intelligence, and security organizations. As a Staff Engineer, you'll be responsible for proactively identifying and resolving performance bottlenecks, architecting solutions for scale, and mentoring other engineers.

The ideal candidate will bring 3+ years of experience with Go and PostgreSQL, along with a proven track record of optimizing high-performance systems. You'll work in a remote-first environment with a global team, contributing directly to the open-source codebase through your personal GitHub account.

Key focus areas include improving the core product architecture, enhancing the load testing infrastructure, and expanding Redis caching capabilities. You'll collaborate with multiple teams, from engineering to customer success, ensuring optimal performance for enterprise-grade deployments.

This role offers the chance to work on meaningful technical challenges while contributing to a platform that enables secure, efficient operations for the world's most critical teams. The position combines hands-on technical work with strategic architectural leadership, making it ideal for engineers who want to make a lasting impact on both product and organizational levels.

Working at Mattermost means joining a company that values customer obsession, trust, self-awareness, ownership, and high impact. The remote-first culture promotes flexibility while maintaining strong collaboration across global teams. If you're passionate about performance engineering and want to contribute to a significant open-source project while solving real-world challenges for critical organizations, this role offers an excellent opportunity to advance your career while making a meaningful impact.

Mattermost, the leading provider of collaborative workflow solutions for defense, intelligence, and security organizations, is seeking a talented React Native Engineer to join their mobile engineering team. This role offers a unique opportunity to work on mission-critical applications that serve some of the world's most important organizations.

The position requires a skilled developer with 3+ years of experience in React Native development, who will be responsible for building and maintaining secure, high-performance mobile applications. The ideal candidate will have strong expertise in JavaScript/TypeScript, React ecosystem, and mobile development patterns, along with experience in state management, reactive programming, and mobile security best practices.

As a React Native Engineer at Mattermost, you'll work in a remote-first environment, collaborating with cross-functional teams to create mobile solutions that solve complex communication challenges in high-stakes environments. Your work will directly impact how critical organizations coordinate, share information, and respond to urgent situations.

The role involves designing and developing features for both iOS and Android platforms, implementing secure communication capabilities, optimizing performance, and contributing to the open-source community. You'll be working with cutting-edge technologies and AI/LLM tools while ensuring the application meets strict security and compliance requirements for enterprise and government clients.

Mattermost offers a unique blend of open-source development and enterprise-grade security requirements, making this an excellent opportunity for developers who want to make a significant impact while working with some of the most demanding and security-conscious organizations in the world. The company values diversity, promotes inclusive practices, and takes a market-based approach to compensation.

This position is perfect for someone who is passionate about mobile development, values security and reliability, and wants to contribute to meaningful projects that serve critical infrastructure and defense sectors. The remote-first nature of the role provides flexibility while allowing you to work with a global team of highly skilled professionals.

React Native Engineer position at Mattermost, building secure mobile applications for defense and intelligence organizations using React Native.

React Native Engineer

Mattermost, the leading collaborative workflow solution for critical sectors like defense and security, is seeking a React Native Engineer to join their mobile engineering team. This role offers a unique opportunity to work on high-impact mobile applications that serve mission-critical organizations worldwide.

The position involves developing and maintaining React Native applications that enable secure, real-time collaboration for organizations where reliability and security are paramount. As a React Native Engineer, you'll be responsible for building responsive mobile interfaces, implementing secure communication features, and optimizing app performance across iOS and Android platforms.

The ideal candidate brings 3+ years of React Native development experience and strong proficiency in JavaScript/TypeScript. You'll work in a remote-first environment, collaborating with cross-functional teams to solve complex communication challenges in high-stakes environments. Your work will directly impact how critical organizations coordinate and share information.

What makes this role exciting is the combination of working with cutting-edge mobile technologies while contributing to an open-source platform that serves some of the world's most important missions. You'll be part of a well-oiled, highly senior team, implementing features that meet strict security and compliance requirements for enterprise and government clients.

The position offers the opportunity to work with modern tools and frameworks, including AI/LLM technologies, while maintaining a strong focus on security and performance. You'll be joining a company that values customer obsession, trust, self-awareness, ownership, and high impact, making it an ideal role for someone passionate about creating secure, efficient mobile solutions for critical infrastructure organizations.

React Native Engineer position at Mattermost, building secure mobile applications for defense and intelligence sectors, requiring 3+ years of experience and strong JavaScript/TypeScript skills.

Mattermost Engineering Jobs

Mattermost builds the #1 collaborative workflow solution for defense, intelligence, security, and critical infrastructure organizations.