Senior Software Engineer, Full Stack

Affirm

Senior Software Engineer at Affirm's Zero to One labs developing and launching scalable AI-enabled systems. Engaging in rapid prototyping and collaborating with product managers in a fast-paced environment.

Posted 7/3/2026full-timeRemote • 🇨🇦 CanadaSenior💰 CA$153,000 - CA$213,000 per yearWebsite

Tech Stack

Tools & technologies

AWSKotlinKubernetesMySQLPythonReactVue.js

About the role

Key responsibilities & impact

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.

Requirements

What you’ll need

You have a total of 4+ years of experience as a software engineer.
You are experienced in designing, developing and launching backend systems at scale technologies like Python, Kotlin, AWS, MySQL, and Kubernetes.
You have experience shipping web apps using declarative UI frameworks like React or Vue.
You have experience leveraging AI tools, agentic coding workflows, and automation to accelerate development, prototyping, and problem solving.
You have strong experience leveraging AI tools, agentic coding workflows, and automation to accelerate development, prototyping, and problem solving.
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.

Benefits

Comp & perks

Health care coverage - Affirm covers all premiums for all levels of coverage for you and your dependents
Flexible Spending Wallets - generous stipends for spending on Technology, Food, various Lifestyle needs, and family forming expenses
Time off - competitive vacation and holiday schedules allowing you to take time off to rest and recharge
ESPP - An employee stock purchase plan enabling you to buy shares of Affirm at a discount

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Backend System DesignWeb Application DevelopmentDeclarative UI FrameworksCode Review StandardsHigh Quality Code WritingAutomation PracticesPrototypingLarge Code Base ManagementMetrics Creation and MonitoringTechnical Planning

Soft Skills

LeadershipCollaborationEffective CommunicationFeedback and GuidanceProblem Solving