Senior Fullstack Software Engineer (AI)

TL;DR

Senior Fullstack Software Engineer (AI): Building and prototyping new business ventures within Affirm's innovation lab with an accent on AI-native development and rapid experimentation. Focus on designing scalable backend systems and declarative UI components to drive high-impact product decisions in a fast-paced, autonomous environment.

Location: Must be based in Canada

Salary: $153,000–$213,000 CAD

Company

Affirm is a financial technology company reinventing credit to provide consumers with flexible, transparent payment solutions.

What you will do

• Own and deliver quarterly goals while leading engineers through ambiguous, open-ended problem spaces.
• Collaborate with product management, design, and analytics to define technical approaches and evaluate trade-offs.
• Proactively identify and resolve project, process, and technical issues.
• Support system availability through monitoring, metrics, and on-call efforts.
• Foster a culture of quality by setting design standards and mentoring team members.
• Leverage AI tools and agentic workflows to accelerate prototyping and development cycles.

Requirements

• Must be based in Canada
• 4+ years of professional software engineering experience.
• Experience designing and launching backend systems at scale using Python, Kotlin, AWS, MySQL, and Kubernetes.
• Proficiency in shipping web applications with declarative UI frameworks like React or Vue.
• Strong experience leveraging AI tools and agentic coding workflows for development and problem-solving.
• Proven ability to define technical plans for significant features with elegant, extensible designs.

Culture & Benefits

• 100% subsidized medical, dental, and vision coverage for employees and dependents.
• Generous flexible spending wallets for technology, food, and lifestyle needs.
• Competitive vacation and holiday schedules.
• Employee stock purchase plan (ESPP) with discounted shares.
• Remote-first work environment with a focus on autonomy and speed.