Hands-on role designing, building, and maintaining scripts, APIs, integrations and agentic AI workflows connecting collaboration tools (Google Workspace, Slack, Zoom, Atlassian) and identity platforms (Okta). Requires ~4–6 years experience, proficiency in scripting/programming (e.g., Java, Go, Python, JavaScript, Bash, PowerShell), familiarity with RESTful APIs, CI/CD, monitoring/observability, and interest or experience with LLMs and automation of IAM/provisioning workflows. Remote (Canada).

Hands-on role designing, building, and maintaining scripts, APIs, integrations, and automations for workplace systems (Google Workspace, Slack, Zoom, Atlassian) and identity platforms (Okta). Responsibilities include integrating LLMs and agents, implementing monitoring/observability, automating onboarding/offboarding and access workflows, and collaborating with IT, Security, and People teams to embed compliance and guardrails.

Remote senior software/application engineer role within Mozilla's IT Workplace Technology team. Responsibilities include designing and maintaining scripts, APIs, and automations for collaboration tools (Google Workspace, Slack, Zoom, Atlassian) and identity platforms (Okta), integrating LLMs/agents, implementing monitoring and observability, and improving onboarding/provisioning workflows. Requires ~4–6 years experience and proficiency in scripting, RESTful APIs, and SaaS integrations.

Full-time, fully remote Senior Software Engineer (iOS) role focused on designing, developing, and improving Thunderbird’s iOS application. Responsibilities include building mobile architecture, improving performance and reliability, testing, debugging, code review, security and accessibility work, and collaborating with product, UX, and open-source contributors. Position is targeted to residents of Canada, offers a CAD salary range of 108,000–125,000, and does not provide visa sponsorship.

Full-time, fully remote (US) Senior Software Engineer, iOS role at MZLA/Thunderbird to contribute to and improve the iOS application’s architecture, performance, reliability, security, and accessibility. Requires 7+ years professional software development (including 2+ years at senior level), strong Swift/SwiftUI skills, mobile app development and security experience, and familiarity with email/communication protocols.

Full-time remote Senior Software Engineer (iOS) to contribute deep iOS expertise to Thunderbird’s mobile product: build and refine architecture, improve performance, reliability, security, and maintainability, collaborate with product/UX and the open-source community. Requires 7+ years professional software development (including 2+ years senior), 3+ years mobile experience, strong Swift/SwiftUI skills, and experience with testing, debugging, Git, and mobile security.

Senior backend role on Ecosystem Services at Mozilla: design, build, deploy, and operate backend platforms that power Mozilla products (e.g., privacy services, AutoPush, Remote Settings). Responsibilities include owning services in production, participating in on-call rotations, working with CloudEng on GCP-based environments, contributing to API design, and collaborating with cross-functional teams. Required: 4+ years backend experience, proficiency in Python/TypeScript/Node.js or Rust, PostgreSQL, Docker, observability tooling (Sentry, Prometheus, Grafana), and GCP.

Remote (Germany) role to manage Mozilla’s web bug bounty program, act as primary interface with external researchers and platforms (e.g., HackerOne), lead triage and technical validation across intake channels, drive end-to-end remediation with engineering teams, collaborate with the Security Incident Response Team, and perform targeted JavaScript and Python code reviews. Requires 3+ years in a security engineering role and experience with bug bounty operations and modern cloud platforms.

The role owns Mozilla’s web bug bounty program (strategy, KPIs, researcher relations), leads triage and technical validation across intake channels (HackerOne, Bugzilla, email), drives end-to-end vulnerability remediation with engineering teams, collaborates with the Security Incident Response Team on incidents and post-incident reviews, performs targeted code reviews (primarily JavaScript and Python), and develops or leverages tooling to improve triage and program insights. Requires 3+ years in a security engineering role and experience with cloud platforms.

Mozilla seeks a student intern for the Gecko networking team to work on Firefox's networking stack and network-related Web APIs (e.g., Fetch, WebTransport). Candidates should have experience programming in Rust and/or C/C++, familiarity with memory safety and test-driven development, and an interest in networking/systems programming. Position is remote in Germany (must be enrolled at a German university) with occasional travel to the Berlin office. Hiring range for Germany: €28.00 EUR per hour.

Work on Mozilla’s Accessibility Team to improve architecture, stability, correctness and performance of the Gecko accessibility engine across OSes. Requires strong C++ and systems programming experience, knowledge of web accessibility/ARIA and JavaScript, experience with cross-platform native applications and multi-process/multi-threaded debugging. Remote role (US) with listed US salary bands.

Work on the core Gecko accessibility engine to improve architecture, stability, correctness, and performance; debug multi-process/multi-threaded and OS-specific issues; implement web features, write tests and specs, collaborate with product/design teams, and engage with the Mozilla open-source community. Requires C++ proficiency, knowledge of web accessibility/ARIA, JavaScript, cross-platform native application experience, and strong English communication.

Work on the core Gecko accessibility engine to improve architecture, stability, correctness, and performance across operating systems. Responsibilities include writing code and tests, debugging multi-process and multi-threaded code, collaborating with other teams and the open source community, and influencing web standards related to accessibility.

Work on Firefox Desktop Desktop Integrations to develop and improve installation, update, and OS integration features across platforms (particularly Windows and macOS). Requires 3+ years as a software engineer, strong C/C++ skills, systems-level programming experience on at least one major platform, and experience collaborating in distributed teams; Rust and low-level Windows/macOS API experience are bonuses.

Mozilla seeks a Senior Software Engineer for the Firefox Desktop Integrations team to develop and improve installer/update features and low-level OS integrations (primarily Windows and macOS). Requires 3–5 years' software engineering experience, strong C/C++ skills, systems-level programming experience on at least one major platform, and experience working in distributed teams. Rust experience and low-level Windows/macOS API knowledge are bonuses.

Mozilla seeks a Senior Software Engineer for the Firefox Desktop Integrations team to develop and improve features related to installs, updates, and OS integrations (particularly Windows and macOS). Requires 3+ years as a software engineer, systems-level programming experience on at least one major platform, strong C/C++ skills; Rust and low-level Win32/Cocoa experience are bonuses. Role is remote (UK hiring range £66,000–£87,000).

Work on Firefox Desktop Desktop Integrations to develop and improve installation, update, and OS integration features. Requires 3+ years as a software engineer, strong C/C++ skills, systems-level programming experience on at least one major platform (Windows or macOS). Bonus: Rust, Win32/Cocoa, Linux/macOS internals, open-source contributions. Role is remote (Finland) and involves collaborating in a distributed team, owning complex bugs, and participating in code reviews.

Work on Firefox Desktop integrations: implement and improve install/update experiences and low-level OS integrations (particularly Windows and macOS). Requires 3+ years as a software engineer with systems-level programming experience (C/C++); Rust and prior OS API experience are bonuses. Role is remote (Belgium).

Work on Firefox features related to installs, updates, and low-level OS integration for Windows and macOS. Requires 3+ years as a software engineer, strong C/C++ and systems-level programming experience; Rust and experience with Win32/Cocoa are bonuses. Remote role based in Spain with a stated salary range of €58,000–€77,000.

Mozilla is hiring a Senior Software Engineer for the Firefox Desktop Integrations team to develop and improve Firefox features related to installs, updates and OS integration (primarily Windows and macOS). Requires 3–5 years' software engineering experience, systems-level programming on at least one major platform, strong C/C++ skills; Rust and low-level Windows/macOS API experience are bonuses. Role is remote (Netherlands) with a listed hiring range of €66,000–€88,000.