Senior Software Engineer, Backend (Merchant & Partner Lifecycle)

Job summary

The engineer will act as a technical leader responsible for building the new lifecycle-orchestrator service at the core of connected systems, delivering immediate availability improvements through system simplification and modernization of older codebases. Responsibilities include designing and expanding the platform backbone to scale globally, aligning cross-team work, and mentoring other engineers.

Job details

At Affirm, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most. The Merchant & Partner Lifecycle (M&PL) team is at the forefront of Affirm’s architectural transformation. We are addressing critical architectural risks by consolidating merchant lifecycle orchestration into a newly cohesive domain. You will act as a technical leader responsible for building out the brand new lifecycle-orchestrator service that’s at the heart of multiple connected systems. Your work will deliver immediate availability improvements through system simplification and isolation, and modernize older parts of the codebase. What You'll Do * 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 * Improve engineering standards, tooling, and processes throughout the organization What We Look For * 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. * Experience designing, developing, and launching backend systems (our stack: AWS, gRPC, Snowflake, Kotlin, Python, MySQL, Kubernetes). Java and Kotlin experience are especially helpful. * Prior experience with monitoring and alerting systems (sentry.io [http://sentry.io/], rollbar, chronosphere, kibana) This posting is for an existing vacancy. 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.) In addition, the employees may be eligible for equity rewards offered by Affirm Holdings, Inc. (parent company). CAN base pay range per year: 153,000 - 213,000 #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 [https://www.affirm.com/global-candidate-privacy-notice] and consent to the use of your personal information as described.

What you’ll do

The engineer will act as a technical leader responsible for building the new lifecycle-orchestrator service at the core of connected systems, delivering immediate availability improvements through system simplification and modernization of older codebases. Responsibilities include designing and expanding the platform backbone to scale globally, aligning cross-team work, and mentoring other engineers.

Requirements

Candidates must have 5+ years of experience as a backend software engineer with a strong understanding of Domain-Driven Design and distributed systems, along with proficiency in data models, API design, state machines, and event-driven architecture. Experience with the specified tech stack including AWS, Kotlin, and Python is highly beneficial.

Benefits

• Equity Rewards • Monthly Stipends For Health • Wellness And Tech Spending • 100% Subsidized Medical Coverage • Dental And Vision For You And Your Dependents • Employee Stock Purchase Plan

Listed skills

• MySQL · Preferred
• Amazon Web Services · Preferred
• Kotlin · Preferred
• Python · Preferred

Other relevant skills

Identified from the job description. Confirm important requirements above.

• Domain-Driven Design
• Distributed Systems
• Data Models
• Api Design
• Http
• Rpc
• State Machines
• Event-Driven Architecture
• Database Design
• Asynchronous Communication
• Aws
• Grpc
• Snowflake
• Kotlin
• Python
• Mysql

Job areas

• Engineering
• Software
• Technology
• Data & Analytics