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Senior Software Engineer - Engineering Workflow and CI
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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:
Firefox developers land code every day to delight users with new features and improve product performance and security. Every day, developers and managers use our team’s applications to develop, build, test, and deliver Mozilla’s core products. We are force-multipliers to enable Firefox developers to do their best work.
What you’ll do:
- Improve Firefox development workflows to reduce time spent testing and debugging test failures as well as more integration/automation of workflows
- Work with a geographically-distributed development team
- Mentor other team members and be mentored by more senior team members
- Collaborate with other teams by providing code review and technical direction
- Look at data, make dashboards, identify trends in Firefox development workflow
What you’ll bring:
- Proven Python skills, including building services
- Front-end development experience, including JavaScript proficiency
- Experience with Python frameworks (e.g., FastAPI, Flask, Django), Cloud Services (e.g., GCP, AWS) and REST
- Solid understanding of databases and SQL
- Experience with CI/CD systems (e.g., GitHub Actions, CircleCI) and test harnesses
- Comfortable working cross-platform, familiar with at least 2 of: Windows, Linux, Mac, Android
- A passion for enhancing developer productivity
- Commitment to our values:
- Welcoming differences
- Being relationship-minded
- Practicing responsible participation
- Having grit
Bonus points for:
- A deep understanding of version control systems
- Experience with containerization and continuous delivery/deployment, particularly with Docker
- Experience with CI of large scale projects
- Comfortable with data analysis
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 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: R3099
Hiring Ranges:
Ready to apply?
Apply to Mozilla
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:
The Localization Team manages the infrastructure that powers localization across all Mozilla products and services, and supports our global community of volunteer localizers. As a Senior Engineer, you’ll contribute to a range of Mozilla localization projects and technologies — from open source libraries like moz-l10n to Pontoon, our Django-based Translation Management System. You’ll also work on internationalization features that shape the experience of Firefox and other Mozilla products, and have the opportunity to engage with development of standards such as Unicode MessageFormat and DOM Localization.
You’ll contribute to architectural discussions and help drive feature development within the team. At Mozilla, Senior Engineers are expected to work independently on well-defined projects, collaborate closely with peers, and play a key role in delivering high-quality software that advances the team’s goals and Mozilla’s mission.
What you’ll do:
- Contribute to the development of Python and JavaScript libraries (such as moz-l10n) and tools that support Mozilla’s localization infrastructure.
- Improve localization and internationalization within the Firefox codebase to make features more adaptable and accessible across languages and regions.
- Collaborate with engineers and program managers to design and implement new Pontoon features.
- Engage with our community of volunteer developers and localizers to support and guide Mozilla’s localization efforts.
- Collaborate effectively with teammates and internal clients across regions and time zones.
What you’ll bring:
- Strong experience developing and maintaining libraries and tools using Python and JavaScript.
- Solid understanding of web technologies, APIs, and modern development workflows.
- Experience with open source development practices and community collaboration.
- Ability to collaborate effectively in a distributed team, across time zones and disciplines.
- Excellent communication skills, with an emphasis on clarity and working across technical and non-technical roles.
- Professional fluency in English (written and verbal).
- Commitment to our values:
- Welcoming differences
- Being relationship-minded
- Practicing responsible participation
- Having grit
Bonus points:
- Experience with internationalization (i18n) and localization (l10n) concepts, tools, or workflows.
- Programming experience in Rust and C++.
- Fluency in another language and understanding of linguistic diversity (e.g., grammar, plurals, text direction, and cultural conventions).
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)
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 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: R2984
Hiring Ranges:
Ready to apply?
Apply to Mozilla
WHO WE ARE 🌍
We help creators get more out of every conversation with Instagram-focused automations and support for other channels like Messenger, WhatsApp, and TikTok. The result? Better engagement, more sales, and real, sustainable growth.
With a diverse team of 350+ people across three continents, we’re building the leading Chat Marketing platform — trusted by more than 1.5 million customers worldwide. AI is one of our top strategic priorities. We’re building intelligent, production-grade systems that power conversations at scale — and we’re just getting started.
WHO WE'RE LOOKING FOR 🌟
We’re hiring a Senior Python Engineer to help build Conversational AI inside Manychat — a production system that enables creators to manage high-volume Instagram conversations at scale. This team is solving that problem by building AI-powered experiences that help creators respond faster, convert more leads, and focus on growing their business. Your work will directly influence how conversations turn into measurable business outcomes.
This role is ideal for someone who thrives in high-load, real-world backend environments and enjoys tackling the practical challenges of production AI: reliability, latency, observability, quality control, and safe behavior at scale. You take ownership, think in systems to turn ambiguity into shipped, impactful solutions.
YOUR FUTURE TEAMMATES 👋
Meet the AI team:
We build AI systems from the ground up — not research silos, but production-ready services that power Manychat at scale. Our strong Python foundation fits naturally into a high-load, product-driven environment.
We collaborate closely with AI Experts, Product Managers, Designers — contributing to architecture, delivery, and reliability decisions that drive speed, stability, and impact.
WHAT YOU'LL DO 🚀
- Design, build, and scale AI-powered backend services embedded directly into the Manychat platform.
- Architect scalable, async Python services operating in high-load, production environments.
- Integrate LLM providers (OpenAI, Azure-hosted models, etc.) with a strong focus on reliability, latency, and cost-efficiency.
- Design and maintain internal and external APIs, ensuring scalability and resilience.
- Own features end-to-end — from discovery and technical design through production deployment, monitoring, and iteration.
- Make architectural decisions that balance speed, scalability, and long-term maintainability.
- Ensure production reliability through strong observability practices (monitoring, logging, alerting).
- Implement and maintain high-quality unit and integration test coverage.
- Contribute to CI/CD pipelines and continuously improve release processes.
- Collaborate cross-functionally with Product, Design, AI experts, and Platform teams in a Scrum environment.
- Connect engineering decisions to measurable product and business impact.
TO SHINE IN THIS ROLE 💥
You’ll need:
- 5+ years of commercial Python development in production environments.
- Strong expertise in modern Python frameworks (FastAPI preferred; Django/Flask acceptable).
- Solid experience designing and integrating APIs (including third-party services).
- Strong understanding of async programming and concurrency (AsyncIO, non-blocking I/O).
- Experience working with PostgreSQL and large datasets.
- Experience building and maintaining high-load backend systems.
- Strong testing practices (unit and integration tests; PyTest preferred).
- Experience with CI/CD pipelines and Docker.
- Strong ownership and product mindset — able to align with stakeholders and connect engineering work to business impact.
It would be great if you have:
- Experience integrating LLMs or AI/ML features into production systems.
- Understanding of AI/ML concepts applied in real-world products.
- Experience with cloud platforms (AWS, Google Cloud, Azure).
- Experience with containerization (Docker).
- Familiarity with observability tools (Grafana, Prometheus).
- Experience with Meta or TikTok APIs.
- Exposure to distributed systems architecture.
WHAT WE OFFER 🤗
We care deeply about your growth, well-being, and comfort:
- 🌍 Hybrid onboarding to start remotely and relocation support for you and your family.
- 💙 Comprehensive health insurance for you and your family.
- 📚 Professional development budget for conferences, courses, and learning resources.
- 🫶 Flexible benefits package tailored to your priorities.
- 🪴 Hybrid work and generous leave options for work-life balance.
- 🍽️ In-office perks including free meals and snacks.
- 🤝 Company-funded sports activities, annual offsites, and team-building events.
Manychat is an Equal Opportunity Employer. We’re committed to building a diverse and inclusive team. We do not discriminate against qualified employees or applicants because of race, color, religion, gender identity, sex, sexual preference, sexual identity, pregnancy, national origin, ancestry, citizenship, age, marital status, physical disability, mental disability, medical condition, military status, or any other characteristic protected by local law or ordinance.
This commitment is also reflected through our candidate experience. If you have individual needs that may require an accommodation during the interview process, please indicate this in your application. We will do our best to provide assistance throughout your interview process to ensure you’re set up for success.
With my application, I accept the Manychat Privacy Policy.
Ready to apply?
Apply to Manychat