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# Software Engineer (Comms Core)

- **Company:** Affirm
- **Location:** San Francisco, CA, United States (Remote available)
- **Experience:** Expert
- **Salary:** $86,000.0 - $122,000.0
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Application Programming Interfaces (APIs), Amazon Web Services, Code Review, Distributed Systems, Amazon DynamoDB, Python (Programming Language), MySQL, Software Engineering, Backend, Kotlin, Kubernetes, Programming Languages
- **Published:** October 19, 2026
- **Apply:** https://job-boards.greenhouse.io/affirm/jobs/8034649003

## About the Role

* You have 5+ years of experience in software development or engineering, with a deep understanding of system design and architecture.
 * Proficiency in modern programming languages such as Python, Kotlin, or similar.
 * You have a track record of developing highly available distributed systems using technologies like AWS, MySQL, DynamoDB, and Kubernetes.
 * You have experience designing multi-region, multi-tenant platforms with strong isolation, scalability, failure recovery, and data-consistency guarantees.
 * You have experience integrating with third-party communications or messaging vendors and designing abstractions that account for different capabilities, rate limits, and failure modes.
 * You have experience defining a technical plan for the delivery of a significant feature or system component with an elegant, 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 code base, and have developed a suite of tools and practices that enable you and your team to do so safely.
 * You are proficient with AI-assisted development tools and apply sound judgment to validate their outputs.
 * Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
 * You have strong verbal and written communication skills that support effective collaboration with our global engineering team.

## Description

Affirm's Communications team builds and modernizes the highly available platform that delivers billions of customer messages reliably and on time across the customer journey. As a senior backend engineer, you will shape multi-region, multi-tenant infrastructure, APIs, and vendor integrations that help product teams communicate with customers at scale.

What you'll do

 * You will own and deliver quarterly technical goals for the Communications area, collaborating with teammates to solve ambiguous, open-ended problems across messaging infrastructure.
 * You will design and evolve reliable backend services for high-volume communications across multi-region, multi-tenant environments, including orchestration, delivery, preferences, templates, and observability.
 * You will collaborate with product management, design, analytics, security, and engineering partners throughout the product lifecycle, articulating technical constraints and balancing customer impact, risks, and trade-offs.
 * You will design, implement, and operate resilient integrations with external messaging vendors, balancing reliability, latency, cost, and compliance.
 * You will proactively identify and solve project, process, technology, or business issues that affect scalability, developer experience, and operational resilience.
 * You will support the operations and availability of your team's services by defining service-level objectives and metrics, improving alerting and incident response, and participating in on-call efforts.
 * You will foster quality and ownership by improving design, testing, code review, rollout, and operational standards, and advocating for them through writing and tech talks.
 * You will help develop talent on your team by providing feedback, mentorship, and technical direction, and leading by example.
 * On-Call Rotation - There would be an on-call rotation for this role as a requirement.