[![Image]() Meet Jobicy Copilot — free AI autofill for job applications + remote job alerts ›](#) [All remote jobs](https://jobicy.com/jobs.md)Open role[![Mozilla logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2020/10/mozilla.jpg)](https://jobicy.com/company/mozilla.md)Remote opportunity at[Mozilla](https://jobicy.com/company/mozilla.md) # Senior Software Engineer, Add-Ons Review the role, location requirements, compensation details, and application process before deciding whether this opportunity fits your next career move. [Apply for this job](#job-application)[View company](https://jobicy.com/company/mozilla.md)Share22 Sep 2026Published38Listing views2Application actions22 Oct 2026Apply before Opportunity details ## About this role. AI SummaryMozilla is seeking a senior software engineer to build and modernize the Firefox Add-ons ecosystem, including automated moderation, reviewer tools, and developer-facing platforms. The role is hands-on across Python/Django, MySQL, React/TypeScript, asynchronous systems, CI/CD, observability, and production operations. It emphasizes reliable delivery practices such as infrastructure and pipelines as code, runbooks, incident response, SLOs, and staged deployments. The engineer will collaborate in a distributed open-source environment and mentor peers while delivering features used by millions of Firefox users. This is a remote role specifically scoped to Finland. ## Role DNA A quick view of the complexity, pace, ownership and collaboration implied by the job description. ### Job Complexity 5/5EasyHard ### Pace & Pressure 4/5RelaxedFast-paced ### Autonomy Level 5/5GuidedFull ownership ### Communication Load 5/5IndependentCollaborative AI insightThis senior role spans full-stack application development, platform reliability, CI/CD, observability, and operational standards in a high-impact production ecosystem. Success requires independently diagnosing complex asynchronous systems and translating operational learning into durable architectural and process improvements. ## Salary analysis Estimated compensation compared with the broader EU market for similar roles. Estimated job medianBelow market€52,500EU market range€150k–€200k0€220k AI insightThe disclosed annual salary range for Remote Finland is €45,000–€60,000 EUR, with a midpoint of €52,500. For comparison, the estimated US market range for a senior software engineer with Django, platform reliability, and DevOps responsibilities is approximately $150,000–$200,000 USD annually; this US market comparison is an estimate and is not a conversion of the Finland offer. ## Core skills Skills and capabilities most closely associated with this opportunity. [Python](https://jobicy.com/jobs?search_keywords=Python.md)[Django](https://jobicy.com/jobs?search_keywords=Django.md)[React](https://jobicy.com/jobs?search_keywords=React.md)[TypeScript](https://jobicy.com/jobs?search_keywords=TypeScript.md)[MySQL](https://jobicy.com/jobs?search_keywords=MySQL.md)[CI/CD](https://jobicy.com/jobs?search_keywords=CICD.md)[Infrastructure as Code](https://jobicy.com/jobs?search_keywords=Infrastructure%20as%20Code.md)[Observability](https://jobicy.com/jobs?search_keywords=Observability.md)[Kubernetes](https://jobicy.com/jobs?search_keywords=Kubernetes.md)[Site Reliability Engineering](https://jobicy.com/jobs?search_keywords=Site%20Reliability%20Engineering.md) Sample interview questionsHow would you improve the reliability of an asynchronous add-on moderation pipeline?I would first map the end-to-end workflow, identify failure modes and dependencies, and define service-level indicators such as queue latency, processing success rate, and time to review. I would add structured logging, tracing, actionable alerts, idempotent job handling, retry policies, dead-letter queues, and runbooks, then use the findings to prioritize architectural improvements. Describe how you would approach modernizing an unfamiliar Django application with operational debt. I would begin by tracing critical user journeys through the frontend, API, background workers, database, and deployment pipeline. I would establish a baseline for tests, monitoring, performance, and operational risks, then deliver incremental improvements behind clear milestones rather than attempting a large rewrite. Each change would include documentation, validation in CI, and a rollback or recovery plan. What does a strong CI/CD pipeline-as-code implementation look like to you? It is version-controlled, reviewable, reproducible, and designed with clear quality gates. I would include automated unit and integration tests, security and dependency checks, artifact traceability, environment promotion rules, staged deployment, health verification, and safe rollback procedures. The pipeline should provide fast feedback while protecting production reliability. How have you used observability to resolve a complex production incident? I use metrics to recognize the scope and impact, logs to identify error patterns, and distributed traces to locate latency or failure across service boundaries. After mitigation, I document the timeline and root causes, improve alerts and runbooks, and implement preventative changes such as capacity safeguards, better retries, or stronger tests. How would you mentor peers on production readiness without creating unnecessary process overhead? I would create lightweight, practical standards embedded in normal engineering work, such as pull-request templates, reusable deployment patterns, concise readiness checklists, and example runbooks. I would pair with teammates on real changes, explain the operational rationale, and regularly gather feedback so the practices remain useful rather than bureaucratic. Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: addons.mozilla.org (AMO) is the foundation of the Firefox add-ons ecosystem. It’s a showcase for developers to publish and grow their extensions, and a place of discovery for millions of users who customize Firefox to make it their own. Behind the scenes are the DevHub which enables developers to manage their extensions. To manage the ecosystem there are a series of Reviewer tools and automated moderation systems. As a Senior Software Engineer, you’ll bring a passion for crafting resilient systems that accelerate our review and moderation teams to provide a first-class experience for Add-on developers. You’ll work closely with engineers, reviewers, developer support, and Add-ons leadership to turn ideas into polished features, modernize the platform and its architecture, and see your work reach millions of people around the world. What you’ll do: * Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub. * Help establish and maintain engineering standards across areas such as code review, definition of done, production readiness, runbooks, incident response, on-call practices, coding conventions, and infrastructure as code. * Create robust observability systems and data-backed insights. * Provide peer feedback, share knowledge and help others grow. * Build and improve the systems that enable Add-ons engineering to safely develop, deploy, observe, and operate production services. * Improve our CI/CD pipelines using declarative, pipeline-as-code approaches that make changes reproducible, testable, and easy to review. * Deliver work iteratively using a visible backlog, short feedback cycles, retrospectives, and demonstrations to stakeholders. * Write clear technical documentation, including design notes, Architecture Decision Records, runbooks, and incident write-ups. * Work effectively in unfamiliar codebases, tracing requests and asynchronous jobs end-to-end to understand failures and identify opportunities for improvement. * Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements. * Contribute in the open through pull requests, code reviews, and discussions. * Work on: Feature development: submission flows, trust and safety signals, DevHub and Reviewer tools modernization. * AMO application systems: Work within our Python/Django, MySQL, React/TypeScript, and asynchronous processing systems. * Internal developer platforms: Create tools and paved paths that make it easier for teams to ship and operate software safely and consistently. * Team Process: Contribute to team ceremonies, execute process improvement, and provide feedback on team effectiveness. * Engineering standards: Help make production readiness, testing, recoverability, documentation, and safe deployment part of the normal development lifecycle. * Platform reliability: Deployments, monitoring, and incident response. What you’ll bring: * Strong hands-on experience building and maintaining production applications with Python/Django. * Experience operating and improving production software systems where reliability and safe delivery matter. * Strong experience with CI/CD systems and treating pipelines and infrastructure declaratively as code. * Experience designing or improving automated testing and deployment workflows, including integration testing and staged or progressive delivery. * Strong understanding of observability as an engineering discipline, including metrics, logging, tracing, service-level objectives, and actionable alerting. * Experience building or maintaining internal tools or platforms used by other engineering teams, with an understanding that internal systems have users, reliability expectations, roadmaps, and lifecycle considerations. * Experience defining or improving engineering practices such as code review standards, operational readiness, runbooks, incident response, on-call expectations, or definitions of done. * Ability to read and understand unfamiliar codebases and trace application behavior across frontend, backend, asynchronous jobs, data stores, and infrastructure. * Experience debugging complex production issues and turning what you learn into lasting system improvements. * Strong technical writing skills, with experience creating useful documentation such as design documents, ADRs, runbooks, and incident reports. * Experience working iteratively with a visible backlog, regular stakeholder feedback, and retrospectives that result in concrete improvements. * Strong collaboration and communication skills in a distributed team environment. * A willingness to share knowledge and mentor peers in operational and reliability practices. * Commitment to our values: Welcoming differences * Being relationship-minded * Practicing responsible participation * Having grit Bonus points for: * Experience with Google Cloud and operating Kubernetes. * Experience with infrastructure-as-code tooling and policy-as-code. * Experience establishing SLOs and error-budget-based reliability practices. * Experience with chaos engineering, disaster recovery testing, or production readiness reviews. * Experience with trust and safety, automated moderation, abuse prevention, or other adversarial systems. * Contributions to open source projects What you’ll get: * Generous performance-based bonus plans to all eligible employees – we share in our success as one team * Rich medical, dental, and vision coverage * Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) * Quarterly all-company wellness days where everyone takes a pause together * Country specific holidays plus a day off for your birthday * One-time home office stipend * Annual professional development budget * Quarterly well-being stipend * Considerable paid parental leave * Employee referral bonus program * Other benefits (life/AD&D, disability, EAP, etc. – varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at [hiringaccommodation@mozilla.com](mailto:hiringaccommodation@mozilla.com) to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: D #LI-REMOTE Req ID: R3023 Hiring Ranges: Remote Finland €45.000—€60.000 EUR Show more [Apply now >](https://jobicy.com/jobs/153899-senior-software-engineer-add-ons.md) * ![Upload CV](data:image/svg+xml;base64,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) ### Upload your resume now To unlock remote work opportunities and be discovered by global employers. 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