Software Engineer II

Mattermost is seeking a highly skilled and experienced Software Engineer II to design, develop, and maintain cutting-edge solutions that enable secure, efficient, and collaborative workflows for mission-critical industries like defence, intelligence, and critical infrastructure.

As a Software Engineer II, you'll work at the intersection of technology and user needs, delivering features that solve real-world problems, particularly in domains where precision, security, and collaboration are paramount. This is more than a coding role—it’s a product engineering role focused on building products with a direct impact on critical workflows. 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:

• Design, build, and maintain software solutions using TypeScript, React, React Native, and Go to deliver secure and scalable products
• Take full-stack ownership by developing user-facing features, back-end architectures, APIs, and integrations
• Contribute to Mattermost’s open-source platform through GitHub, creating impactful open-source solutions for both internal and external ecosystems
• Collaborate with product managers, designers, and engineers to prototype and ship tailored solutions for complex workflows
• Mentor peers through code reviews, technical discussions, and knowledge sharing, fostering a culture of excellence
• Implement and maintain unit/integration/e2e tests to ensure code quality and robust platform performance
• Diagnose and resolve bugs or performance bottlenecks, ensuring security and reliability in deployments
• Leverage customer and industry feedback to iterate rapidly and deliver adaptable, high-value solutions
• Lead the development of mission-critical, customer-focused solutions, anticipating the evolving needs of defence, intelligence, and infrastructure industries

Requirements

• BS in Computer Science, Computer Engineering, or related field/experience
• 3+ years of experience working as a full-stack software engineer building scalable, production-ready systems
• Strong skills in our technology stack: TypeScript, React, React Native, Go, and/or PostgreSQL
• Expertise in full-stack development, including designing APIs, implementing frontends, creating fault-tolerant back-end code, and optimising database performance
• Enthusiasm for and experience developing with AI tools like Claude Code, Cursor and/or GitHub Copilot
• Solid understanding of modern development workflows, including CI/CD pipelines, distributed systems, and cloud infrastructure
• Comfortable working as a product engineer, focused on solving customer-centric problems in addition to writing code
• 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 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.