Lead Application Security Engineer (Remote) at Mattermost (S12)
Open source developer collaboration platform
6+ years
About Mattermost

Mattermost is an open source, remote-first enterprise software company headquartered in Palo Alto, California with engineering teams around the world. Our first product is an open source Slack-alternative for high trust DevOps teams who need to execute modern DevOps workflows while meeting stringent regulatory requirements.

About the role

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. Hundreds of thousands of developers around the globe trust Mattermost to increase their productivity by bringing together team communication, task and project management, and workflow orchestration into a unified platform for agile software development.

Founded in 2016, Mattermost’s open source platform powers over 800,000 workspaces worldwide with the support of over 4,000 contributors from across the developer community. The company serves over 800 customers, including European Parliament, NASA, Nasdaq, Samsung, SAP, United States Air Force and Wealthfront, and is backed by world-class investors including Battery Ventures, Redpoint, S28 Capital, YC Continuity. To learn more, visit www.mattermost.com.

We value high impact work, ownership, self-awareness and being focused on customer success. If these values match who you are, we hope you'll learn more about working at Mattermost and apply!

Mattermost is seeking a result-driven and analytical Lead Product Security Engineer to help ensure the security of our product and services across the company. As leader of our Product Security team you will work closely with a globally distributed team to support in all the different aspects of the software development life cycle. You will be responsible for the implementation of additional application security tooling and/or processes across the company and coordinate with relevant stakeholders, gather requirements, and lead the implementation.


  • Manage a globally distributed team of security engineers
  • Ownership of vulnerability management and mitigation approaches
  • Manage and lead security projects to increase security posture of products and company
  • Support threat modeling of in-house developed software components
  • Conduct application security reviews through manual code review or static/dynamic code analysis
  • Architecture and review of security components
  • Provide security training and outreach to internal development teams
  • Develop security guidance documentation
  • Support the development of our application security program
  • Maintain and grow our bug bounty program

Required Background/Skills:

  • Bachelor's degree in Computer Science or related fields, or significant professional application security experience
  • 1-2 years of experience leading product security teams
  • 5+ years of demonstrated experience in product security, security research and/or secure software development
  • Familiarity with common security libraries, security controls, and common security flaws
  • Experience with static/dynamic analysis, and common exploit tools and methods
  • Experience in one or more programming languages, ideally Go or Javascript
  • Comfortable with using Git
  • Excellent written and verbal communication skills
  • Demonstrable teamwork skills and resourcefulness
  • Linux experience

Preferred Background/Skills:

  • Experience working in open source communities
  • Experience with OWASP SAMM or other security assessment standards
  • Certifications in the domain of penetration testing, or application security (e.g. OSCP, OSWE, GWAPT, …)
  • Experience with Kubernetes / Docker
  • Experience working in open source communities
  • Participation in Bug Bounties, CTFs or similar activities

Mattermost is built in Golang, React and React Native you can find our source code at https://github.com/mattermost/ Learn more about our architecture at https://www.youtube.com/channel/UCNR05H72hi692y01bWaFXNA

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