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Mattermost is seeking a fully remote US Defense Software Engineering Lead anywhere in the United States to lead a small, agile development team dedicated to building mission-critical capabilities on top of the Mattermost platform for US national security customers. You will sit at the intersection of product delivery, customer partnership, and engineering excellence — translating the complex operational needs of defense users into software that works reliably in the most demanding environments on earth.
This is not a role for a detached manager. You will be hands-on, customer-facing, and deeply invested in the US national security mission. You'll collaborate closely with customers and forward-deployed engineers to gather requirements from the field, then translate those requirements back to your product engineering team to drive delivery. You will own the full stack — from architecture decisions to shipping — and set the bar for quality, velocity, and accountability.
Do you thrive in high-stakes environments where the software you build genuinely matters? Are you energized by leading focused, high caliber engineers and working directly alongside the customers who depend on your work? Do you embrace AI as a force-multiplier for engineering productivity? If so, we want to hear from you.
Mattermost is uniquely positioned at the intersection of secure collaboration, mission software, and defense modernization. This role offers the opportunity to shape and scale Mattermost's presence within one of the largest and most strategic branches of the U.S. Department of Defense.
If you thrive in complex environments, understand how mission outcomes drive technology adoption, and want to sell software that matters—we'd love to hear from you.
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.
Ready to apply?
Apply to Mattermost
Mattermost is looking for a Senior React Platform Engineer to help us redefine the limits of web application performance and reliability. You will join the Core Web team to lead the evolution of our web architecture, shared libraries, and networking strategies.
Your work sits at the intersection of modern frontend infrastructure and extreme environment resilience. You’ll be responsible for ensuring that our web platform is both a joy for developers to build on and a reliable tool for users in the most challenging network conditions—specifically DDIL (Disconnected, Denied, Disrupted, Intermittent, and Limited) environments. This isn't just about building features; it's about building the engine that powers them.
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:
Requirements:
Preferences
Compensation:
Mattermost takes a market-based approach to pay. Actual compensation may vary based on location, skills, experience, qualifications, and market conditions. U.S. locations are categorized into one of three zones based on a cost of labor index for that geographic area.
These ranges may be updated in the future. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, and work location.
Ready to apply?
Apply to Mattermost
Mattermost Federal | TS/SCI Environments
Mattermost Federal builds secure collaboration platforms used by U.S. defense, intelligence, and national security organizations operating in the most demanding environments in the world.
We are looking for Forward Deployed Engineers (FDEs) who want to solve real operational problems alongside mission teams. In this role you will work directly with operators, analysts, and engineers to deploy and build systems that are used every day in mission environments.
This is not a traditional engineering role. You will operate close to the mission, often inside classified environments, working through ambiguity and building solutions that have immediate operational impact.
The problems you will work on here are hard, ambiguous, and consequential.
Forward Deployed Engineers operate at the intersection of engineering, operations, and mission execution.
You will:
You will move between writing code, deploying infrastructure, and working directly with operators, often within the same week.
Travel is typically approximately one week per month onsite with customers.
Forward Deployed Engineers at Mattermost Federal are mission partners, not external vendors.
Our customers operate in environments where coordination and decision speed matter. FDEs work side-by-side with mission teams to deliver systems that improve operational outcomes.
We are looking for engineers who:
Mattermost Federal is aggressively adopting AI-enabled workflows across mission operations.
FDEs will be among the first engineers deploying and operationalizing AI capabilities in secure environments.
You will help build and deploy systems such as:
We are looking for engineers who are excited about experimenting with AI capabilities while maintaining mission-grade security and reliability.
The best software is built close to the problem.
Forward Deployed Engineers at Mattermost Federal work directly with the people using the systems we build. You will see problems firsthand, build solutions quickly, and deploy them into environments where reliability, security, and speed matter.
If you want to build systems used in real missions and work directly with the people who depend on them, this role is for you.
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.
Ready to apply?
Apply to Mattermost
Mattermost Federal | TS/SCI Environments
Mattermost Federal builds secure collaboration platforms used by U.S. defense, intelligence, and national security organizations operating in the most demanding environments in the world.
We are looking for Forward Deployed Engineers (FDEs) who want to solve real operational problems alongside mission teams. In this role you will work directly with operators, analysts, and engineers to deploy and build systems that are used every day in mission environments.
This is not a traditional engineering role. You will operate close to the mission, often inside classified environments, working through ambiguity and building solutions that have immediate operational impact.
The problems you will work on here are hard, ambiguous, and consequential.
Forward Deployed Engineers operate at the intersection of engineering, operations, and mission execution.
You will:
You will move between writing code, deploying infrastructure, and working directly with operators, often within the same week.
Travel is typically approximately one week per month onsite with customers.
Forward Deployed Engineers at Mattermost Federal are mission partners, not external vendors.
Our customers operate in environments where coordination and decision speed matter. FDEs work side-by-side with mission teams to deliver systems that improve operational outcomes.
We are looking for engineers who:
Mattermost Federal is aggressively adopting AI-enabled workflows across mission operations.
FDEs will be among the first engineers deploying and operationalizing AI capabilities in secure environments.
You will help build and deploy systems such as:
We are looking for engineers who are excited about experimenting with AI capabilities while maintaining mission-grade security and reliability.
The best software is built close to the problem.
Forward Deployed Engineers at Mattermost Federal work directly with the people using the systems we build. You will see problems firsthand, build solutions quickly, and deploy them into environments where reliability, security, and speed matter.
If you want to build systems used in real missions and work directly with the people who depend on them, this role is for you.
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.
Ready to apply?
Apply to Mattermost
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:
Requirements:
Preferences:
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.
Ready to apply?
Apply to Mattermost
Mattermost is seeking an experienced and visionary Lead Site Reliability Engineer (SRE) to guide the architecture, reliability, and operational excellence of the infrastructure powering our secure, mission-critical collaboration platform.
In this role, you will provide technical leadership across our SRE function, driving strategic initiatives for scalability, observability, performance, and automation across cloud and hybrid environments. You will mentor engineers, establish best practices, and collaborate closely with development, security, and operations teams to ensure our customers in defense, government, and critical infrastructure sectors experience exceptional reliability and performance.
Responsibilities Include:
Requirements:
Preferences:
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.
Ready to apply?
Apply to Mattermost
Mattermost is seeking a Senior React Native Engineer to join our mobile engineering team and build resilient mobile experiences for mission-critical industries like defense, intelligence, and critical infrastructure. This is not a feature development role: you'll be focused on the networking, architecture, and reliability challenges of running a real-time collaboration platform in DDIL environments where connectivity is unreliable and message delivery is non-negotiable.
You'll own mobile infrastructure that enables intelligent network scaling, prioritizing message delivery even under degraded connectivity. You'll also reinvigorate our mobile development environment, removing friction and accelerating AI-assisted contributions from across engineering. Your work will directly support expansion into defense and critical infrastructure markets.
This role offers the unique opportunity to contribute to our open-source platform while solving hard networking, state, and architecture problems that serve some of the world's most important missions.
Responsibilities Include:
Requirements:
Preferences:
Compensation:
Mattermost takes a market-based approach to pay. Actual compensation may vary based on location, skills, experience, qualifications, and market conditions. U.S. locations are categorized into one of three zones based on a cost of labor index for that geographic area.
These ranges may be updated in the future. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, and work location.
Ready to apply?
Apply to Mattermost
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