Join to apply for the Software Engineer II role at Mattermost Overview 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. This role focuses on building products with a direct impact on critical workflows and contributes to Mattermost’s open-core platform." Responsibilities

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 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 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 high-value solutions Lead the development of mission-critical, customer-focused solutions for defence, intelligence, and infrastructure industries

Requirements

BS in Computer Science, Computer Engineering, or related field/experience 3+ years of experience as a full-stack software engineer building scalable, production-ready systems Strong skills in TypeScript, React, React Native, Go, and/or PostgreSQL Expertise in full-stack development, including API design, front-end implementation, back-end code, and database optimization Enthusiasm for and experience developing with AI tools (e.g., Claude Code, Cursor, GitHub Copilot) Solid understanding of modern development workflows, CI/CD, distributed systems, and cloud infrastructure Product-oriented mindset, solving customer-centric problems in addition to writing code Strong written and verbal communication skills for diverse audiences Ability to work independently across time zones while collaborating with a team

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 Experience working fully remotely with global teams

Company and Equal Opportunity Mattermost takes a market-based approach to pay; starting pay is determined based on skills, experience, location, and market conditions. Mattermost is an EEO employer, remote-first, and open-source. We are committed to compliance with local laws and regulations and encourage applicants from all backgrounds. We do not tolerate discrimination 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. Other Referrals increase your chances of interviewing at Mattermost. Get notified about new Software Engineer jobs in United Kingdom.

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