Senior Software Engineer, Backend (Consumer Authentication Platform)

What We Look For

• You have 4+ years of experience designing, developing, and launching backend systems at scale using languages like Python, Kotlin, Java, or another comparable modern programming language.
• You have a track record of developing highly available distributed systems using technologies like AWS, MySQL, and Kubernetes, as well as relational databases, event-driven architectures, and RPC or API frameworks.
• You have experience defining a technical plan for the delivery of a significant feature or system component with an elegant, secure, 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 codebase and have developed a suite of tools and practices that enable you and your team to do so safely, including testing strategies, migration plans, and controlled rollouts.
• Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, manager, and stakeholders, while helping other engineers grow through mentorship and technical leadership.
• You have strong verbal and written communication skills that support effective collaboration with our global engineering team and cross-functional partners.
• This position requires either equivalent practical experience or a bachelor’s degree in a related field.
• Familiarity with standards and protocols such as OAuth 2.0, OpenID Connect, WebAuthn/passkeys, FIDO2, JWTs, and public-key cryptography. Knowledge of security and assurance frameworks such as the NIST Digital Identity Guidelines or PCI DSS.
• Experience designing session-management, token-issuance, account-recovery, or multi-factor authentication systems. Familiarity with risk-based or adaptive authentication and the interaction between identity, security, compliance, and fraud controls.
• 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.