Senior Software Engineer, Backend (Trust & Safety)
Affirm
CA$153,000 - CA$213,000 / year
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Description
At Affirm, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most.
Trust & Safety Engineering protects Affirm’s consumers, merchants, and network from fraud and abuse. We build the real-time systems, risk signals, and tools that stop bad actors without adding friction for the people we serve. Our engineers work with data science, risk, and operations to stay ahead of evolving threats at scale
You will be matched with a role after completing the interview evaluation process. Your recruiter will work closely with you throughout the process to understand your interests and experience to find the strongest role fit.
What you’ll do
- You will be responsible for owning and delivering quarterly goals for your team, leading engineers on your team through ambiguity to solve open-ended problems, and ensuring that everyone is supported throughout delivery.
- You will support your peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
- You will proactively identify project, process, technology or business issues, advocate for them, and lead in solving them.
- You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” & on-call efforts.
- You will foster a culture of quality and ownership on your team by setting or improving code review and design standards for your team, and advocating for them beyond your team through your writing and tech talks.
- You will help develop talent on your team by providing feedback and guidance, and leading by example.
What we look for
- You have 4+ years of experience designing, developing and launching backend systems at scale using languages like Python or Kotlin.
- You have a track record of developing highly available distributed systems using technologies like AWS, MySQL and Kubernetes.
- You have experience defining a technical plan for the delivery of a significant feature or system component with an elegant, simple and extensible design. You write high quality code that is easily understood and used by others.
- You are proficient at making significant changes in a large code base, and have developed a suite of tools and practices that enable you and your team to do so safely.
- Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
- You have strong verbal and written communication skills that support effective collaboration with our global engineering team.
This remote role is open only to candidates residing in Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, or Saskatchewan
Pay Grade - N
Equity Grade - 6
Employees new to Affirm typically come in at the start of the pay range. Affirm focuses on providing a simple and transparent pay structure which is based on a variety of factors, including location, experience and job-related skills.
Base pay is part of a total compensation package that may include equity rewards, monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents.)
CAN base pay range per year: $153,000 - $213,000 CAD
#LI-Remote
Remote-first with flexibility built in
Affirm is proud to be a remote-first company. Most roles can be done from almost anywhere within the country of employment. Some positions may occasionally require in-person work at an Affirm office, and a few are office-based due to the nature of the work. All new hires will be invited to attend an in-person onboarding experience.
Benefits designed for you
Our benefits reflect our commitment to care, transparency, and flexibility. Here are a few highlights:
- Health coverage at no cost: We cover 100% of premiums for employees and their dependents.
- Spending stipends: Monthly stipends support your tech setup, and the ability to choose health and wellness options that are right for you.
- Time off to recharge: Flexible time off and generous holiday calendars help you rest when you need to.
- Own a piece of what you build: Our employee stock purchase plan (ESPP) lets you buy Affirm stock at a discount.
We’re committed to providing an inclusive interview process, including accommodations for candidates with disabilities. If you need support, we’re happy to help.
For positions based in San Francisco or Los Angeles: Affirm considers qualified applicants with arrest and conviction records, as required by law.
By clicking "Submit Application," you acknowledge that you have read Affirm's Global Candidate Privacy Notice and consent to the use of your personal information as described.
Benefits
- health insurance
- stock options
About this role
Affirm's Trust & Safety Engineering team builds real-time fraud and abuse prevention systems that protect consumers, merchants, and the network while keeping friction minimal. As a Senior Software Engineer on this team, you'd own quarterly goals, lead engineers through complex problems, and partner with data science, risk, and operations to stay ahead of evolving threats at scale. The role demands both technical depth—designing and operating highly available distributed systems—and leadership maturity, including code review standards, talent development, and cross-functional collaboration with product, design, and analytics.
This position suits someone with 4+ years building backend systems in Python or Kotlin on cloud infrastructure like AWS and Kubernetes, who has shipped significant features with clean, extensible designs. You'll need a track record of making large codebases safer and easier to change, strong communication skills for a global team, and genuine ownership of your own growth. The work is remote across Canadian provinces, with a base salary of $153,000–$213,000 CAD plus equity, full health coverage, and monthly stipends for wellness and tech.
How this employer is doing
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In the news
Late Payments Overshadow Affirm’s Earnings Beat, Sending Down the Stock, Barron's
Pay for this role
$153,000 to $213,000 per year
That is the employer's posted range, and where you land in it is usually decided in one conversation. Before that conversation, run the numbers: analyze an offer for this role.
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