Senior Security Engineer - Security Applications Development

Mozilla (View all Jobs)

Remote Canada

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Interview Process

1. Deep-dive discussions on technical and mentorship problems solved in the past. No live coding. Total of 3 rounds.


$104,000 CAD - $153,000 CAD

Programming Languages Mentioned

Python, Golang

Hiring Ranges:
Canada Tier 1 Locations: $104,000 CAD - $153,000 CAD
Canada Tier 2 Locations: $94,000 CAD - $138,000 CAD

To learn more about our Hiring Range System, please click this link.

Mozilla’s ITEO Security Engineering Team is looking for a software development-focused Security Engineer to help create the next generation of our in-house security tooling. This position will be responsible for writing and maintaining code in areas like cryptography, cloud security automation, detection, and other security areas. As a security engineer you will also work closely with the rest of the SecEng team and other partner groups on a variety of general security related projects and tasks.

As a Security Development Engineer at Mozilla, you will…

  • Create scalable, maintainable applications primarily in Python and Golang to support MoCo’s security operations and product use cases
  • Write, maintain, and expand automation scripts and monitoring tools
  • Protect the services which Mozilla Corporation and our products like Firefox and others depend on from attacks and abuses
  • Work with developers and operations teams across the organization to keep the Firefox backend infrastructure safe

Your Professional Profile

This role involves heavy coding, along with other SecOps and engineering tasks. You should be very well versed in Python and Go with other languages as well being a plus. You should also feel comfortable running infrastructure in cloud for the code you write and documenting your applications for other ops teams to run with. Relevant skills include:

  • Real-world experience writing security-centric applications in Python and Go. We prefer Python, but actively use both in our stack.
  • Understand how to write and deploy container-based applications in public cloud (GCP, AWS) - especially in ways that can scale out automatically.
  • Have some knowledge in areas such as SecOps, cloud, vulnerability management, application security, or other related fields.
  • A B.S. in Computer Science or equivalent knowledge, however real-world experience is preferred.

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 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

Req ID: R1731

Please mention No Whiteboard if you apply!
I'm a one-man team looking to improve tech interviews, and could use any support! 😄

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