Senior Software Engineer, Backend (Merchant Advocacy)
Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest. The Merchant & Partner Lifecycle (M&PL) team is at the forefront of Affirm’s architectural transformation.
What this role actually needs.
Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest. The Merchant & Partner Lifecycle (M&PL) team is at the forefront of Affirm’s architectural transformation. Responsibilities: - Design & expand the backbone of our platform to scale to hundreds of thousands of merchants from all around the world - Design and align the scope of work with other teams to deliver cross-team projects - Mentor other engineers to ensure their development & growth - Partner with Engineering Manager and Team Lead to drive and execute the long-term vision of the team - Execute technical strategy for broad or complex requirements with insightful and forward-looking approaches that go beyond the direct team and solve large open-ended problems - Utilize agentic development tools like Claude Code to automate parts of the development process Requirements: - Utilize agentic development tools like Claude Code to automate parts of the development process - Improve engineering standards, tooling, and processes throughout the organization - 5+ years of experience as a backend software engineer - A strong understanding of Domain-Driven Design, distributed systems, and how architectural decisions affect performance and maintainability - Proficiency with data models, API design (http and RPC), state machines, event-driven architecture, and database design - Excellent communication skills, both written and verbal. Must be proficient in asynchronous communication–written tech specs, ADRs, project plans, etc. Benefits: - 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 Company context: Affirm is the public buy-now-pay-later platform powering checkout financing for top retailers across North America.
Day-to-day expectations
Affirm lists these responsibilities for the Senior Software Engineer, Backend (Merchant Advocacy) role.
- Design & expand the backbone of our platform to scale to hundreds of thousands of merchants from all around the world
- Design and align the scope of work with other teams to deliver cross-team projects
- Mentor other engineers to ensure their development & growth
- Partner with Engineering Manager and Team Lead to drive and execute the long-term vision of the team
- Execute technical strategy for broad or complex requirements with insightful and forward-looking approaches that go beyond the direct team and solve large open-ended problems
- Utilize agentic development tools like Claude Code to automate parts of the development process
What a strong candidate brings
These requirements are extracted from the source listing and normalized for UpJobz readers.
- Utilize agentic development tools like Claude Code to automate parts of the development process
- Improve engineering standards, tooling, and processes throughout the organization
- 5+ years of experience as a backend software engineer
- A strong understanding of Domain-Driven Design, distributed systems, and how architectural decisions affect performance and maintainability
- Proficiency with data models, API design (http and RPC), state machines, event-driven architecture, and database design
- Excellent communication skills, both written and verbal. Must be proficient in asynchronous communication–written tech specs, ADRs, project plans, etc.
Why people would want this job
Affirm published these compensation, benefits, or working-context details with the role.
- 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
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Source: job-boards.greenhouse.io · Source ID: 7636416003 · Confidence: 89/100 · Last checked: May 7, 2026
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