Senior Software Development Engineer - Remote

Unlike traditional cards, every pay-later transaction is backed by its own unique loan, and our system is the "invisible piping" that makes this complex model work at scale. Every swipe triggers our platform to solve a hard problem in milliseconds: matching messy, fragmented payment network data to the correct loan to drive real-time approvals, origination, and refunds.
you'll be building the "financial brain" for our flagship card products, with your work on the critical path for every single swipe. You will partner closely with product, data science, and engineering teams to design and build the future of our industry-leading money movement platform.
If you are passionate about making foundational design decisions and building a beloved, lasting financial brand—come join us. Drive technical strategy by leading the planning, prioritization, and execution of projects, ensuring alignment with product, technical, and business goals.
This includes building robust APIs and data models for our micro-service and event-driven architectures.
Collaborate across functions with partners in Product, Analytics, Design, Legal, and Accounting and to define requirements and execute our card loan attribution and lifecycle strategy.
Ensure system health and performance by analyzing and troubleshooting complex technical issues, optimizing existing code, and driving solutions that focus on long-term robustness and scalability.
Mentor and grow the team by guiding junior engineers, leading technical discussions and design reviews, and championing best practices through code review.
5+ years of experience in software development or engineering, with a deep understanding of system design and architecture.

• Strong analytical and problem-solving skills, with a creative and solution-oriented mindset.
• Proficiency in modern programming languages such as Python, Kotlin, or similar.
• Experience with cloud platforms (AWS, Azure, Google Cloud) and containerization (Docker, Kubernetes).
• Knowledge of database systems (SQL, NoSQL), web frameworks, and RESTful API development.
• This position requires either equivalent practical experience or a Bachelor’s degree in a related field.

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
Equity Grade - 6
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
Remote-first with flexibility built in
Affirm is proud to be a remote-first company. 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. Health coverage at no cost: Flexible time off and generous holiday calendars help you rest when you need to.
We're committed to providing an inclusive interview process, including accommodations for candidates with disabilities. If you need support, we're happy to help.