About this role

Our Engineering organization owns the software that makes our marketplace work. Our Application Security function is focused on keeping vulnerabilities out of the code and software as it's built and shipped, owning the SDLC from commit to production. We care about good engineering practice and love to write software that is secure, tested, easy to maintain, and can scale to millions of users. We build scalable, reusable frameworks; consult with product teams; listen to the data; and iterate.

As a Senior Security Engineer, Application Security, you'll collaborate with us to:

• Find and fix vulnerabilities in first-party code and third-party dependencies using AI-powered detection, SAST, DAST, SCA, and secret scanning tooling.
• Build shift-left tooling and CI/CD guardrails that make the secure path the default in the build pipeline.
• Own offensive security engagements such as penetration tests with external vendors.
• Evaluate and harden the security of AI-assisted code generation workflows.
• Own the bug bounty program and the vulnerability management lifecycle end to end, from intake through remediation and closure.
• Lead threat modeling and secure design reviews for new products and high-risk platform changes, shaping the architecture before the code is written rather than reviewing it after.
• Conduct security reviews and consultations with product and platform teams and develop secure coding standards and scaling frameworks for recurring vulnerability classes.

We're excited about you because you have:

• Hands-on experience integrating security into the software development lifecycle.
• Experience driving vulnerability remediation across teams you do not own, with a point of view on how to set severities, hold SLAs, and get things actually closed.
• Exposure to offensive security, whether that is running a bug bounty program, scoping penetration tests with external vendors, or finding and reporting real vulnerabilities yourself.
• A passion for coding and solving security problems scalably with code and automation, rather than with process and policy.
• Comfort writing and reviewing code in OOP languages such as Kotlin, Java, Python, or TypeScript, enough to read an unfamiliar service, judge whether a finding is real, and open the pull request that fixes it.
• Practical experience with AppSec detection tooling (SAST, DAST, SCA, or secret scanning), including the unglamorous parts: deploying it, tuning the rules, and cutting the false positives so engineers trust the results.
• A thorough understanding of web application security principles and common vulnerabilities, including OWASP Top 10, with an instinct for the systemic fix behind the individual finding.
• Experience leading threat models on systems you did not build, and the judgement to know which designs need one and which do not.
• Experience working in modern cloud computing environments such as AWS or GCP.
• The ability to explain risk to product engineers in a way that makes them want to fix it, and the credibility to be invited into design discussions rather than added as a gate.
• Curiosity about the security of AI-assisted development, and interest in figuring out what changes when a meaningful share of the code is machine-generated.

Technologies we use and teach:

• Kotlin, Typescript, Python
• AppSec tooling - SAST/DAST/SCA/secret scanning
• AWS, OCI, Terraform, Kubernetes
• AI tooling - Cursor, Claude

Salary Range

Canada: the pay range for this role is $160,000 to $220,000 per year.

This role will also be eligible for equity and benefits. Actual base pay will be determined based on permissible factors such as transferable skills, work experience, market demands, and primary work location. The base pay range provided is subject to change and may be modified in the future.

Faire uses Artificial Intelligence (AI) to screen and select applicants for this position.

This job posting is for an existing vacancy.

Hybrid Faire employees currently go into the office 3 days per week on Tuesdays, Thursdays, and a third flex day of their choosing (Monday, Wednesday, or Friday). Additionally, hybrid in-office roles will have the flexibility to work remotely up to 4 weeks per year. Specific Workplace and Information Technology positions may require onsite attendance 5 days per week as will be indicated in the job posting.

Why you'll love working at Faire

• Move fast: You'll own meaningful problems that serve customers around the globe with the agency to move fast and see your results clearly.
• Equipped to scale: We invest in what matters, including the latest enterprise AI tools, to help you work smarter and get more out of every day.
• Best in class: Our team is full of sharp, kind, and generous colleagues who care about their craft and about helping you grow in yours.
• Real rewards. Competitive pay, equity, and comprehensive benefits designed to support your life inside and outside of work.
• Belonging: We're intentional about building an environment where every Faire employee has equal access to opportunities, growth, and success.

Faire was founded in 2017 by a team of early product and engineering leads from Square. We're backed by some of the top investors in retail and tech including: Y Combinator, Lightspeed Venture Partners, Forerunner Ventures, Khosla Ventures, Sequoia Capital, Founders Fund, and DST Global. We have headquarters in San Francisco and Kitchener-Waterloo, and a global employee presence across offices in Toronto, London, and New York. To learn more about Faire and our customers, you can read more on our blog.