Joblaze summary

In this role, the Senior Software Engineer focuses on developing and maintaining the backend infrastructure that supports machine learning models at Affirm. Key skills include proficiency in Python or Kotlin, experience with distributed systems, and familiarity with AWS, MySQL, and Kubernetes. This position is ideal for candidates with over four years of experience in backend development who are comfortable leading teams and navigating complex technical challenges. The team emphasizes collaboration and quality, fostering an environment where engineers can grow and innovate.

Joblaze insights

Listed today — first seen on Joblaze November 14, 2026. Last confirmed on Affirm's careers page November 14, 2026.
This exact title is also open at 1 other location at Affirm: United States.
Starts above 27% of 33 comparable senior backend roles in Canada that list Python we track (median $107,323 across 13 companies). See Python salary trends
Python appears in 45.6% of 79 comparable senior backend roles in Canada; MySQL appears in 15.2% of 79 comparable senior backend roles in Canada.

Quick facts

Is the Senior Software Engineer, Backend (ML Training and Serving) role remote?: Yes — Affirm lists this as a fully remote position.
What's the salary range?: Affirm lists CAD 153,000–CAD 213,000 for this role.
How much experience is required?: At least 4 years of relevant experience for this Senior Software Engineer, Backend (ML Training and Serving) role.
What's the tech stack?: Joblaze extracted these technologies from the posting: AWS, Kotlin, Kubernetes, MySQL, Python.
What seniority level is this role?: Affirm targets senior candidates for this position.
Is this full-time or contract?: Full-time for this Senior Software Engineer, Backend (ML Training and Serving) role at Affirm.

From the original posting

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.

About the team

Machine Learning is central to how Affirm delivers on its mission, powering decisions across underwriting, fraud, servicing, and personalization. We are seeking a Senior Software Engineer to join our ML Training & Serving engineering team, the team that builds and operates the critical infrastructure that enables models to be trained and served across Affirm.

This role sits at the intersection of distributed systems, ML infrastructure, and platform engineering. We value engineers who listen closely, invite feedback, and work effectively across organizational boundaries, while maintaining a high bar for ownership, technical judgment, and execution. Strong candidates care about building reliable shared platforms, improving developer velocity, and creating durable systems that enable teams across the company to move faster with confidence.

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.
Experience training and deploying models for production is a nice to have.

Base Pay Grade - N

Equity Grade - 6

Base pay is part of a total compensation package that may include monthly stipends for health, wellness and tech spending, and benefits (including 100% subsidized medical coverage, dental and vision for you and your dependents). In addition, the employees may be eligible for equity rewards offered by Affirm Holdings, Inc. (parent company).

CAN base pay range per year: $153,000 - $213,000

Location - Remote Canada
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.

#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.

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.

Standard company text repeated across Affirm's postings is omitted here.

Senior Software Engineer, Backend (ML Training and Serving)

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