Software Engineer II, Backend (Online Storage)

The Data and Storage Services team is responsible for Affirm's data infrastructure across OLTP and OLAP systems. The Online Storage team provides a set of managed databases as a platform, used to persist data for all Affirm services. We are looking for a talented Software Engineer who can build and scale Cache Services (Redis and Valkey) identifying opportunities to improve how we migrate, productionize, operate, self-service and improve this mission-critical infrastructure.

Responsibilities

Build and scale Affirm's Cache Services on Redis and Valkey, owning cluster migrations end to end and delivering them in phases against agreed outcomes; Productionize cache clusters: capacity and shard planning, failover and replication setup, upgrades, and staged rollouts with rollback paths; Replace manual cache requests (provisioning, config changes, access) with automated, audited self-service workflows; Operate the fleet in production: define SLOs, build alerting for hot keys, memory pressure and replication lag, and use on-call findings to reduce KTLO; Partner with client teams on caching strategy (key design, TTLs, consistency, client timeouts) and feed fleet data into the team's roadmap; Break down larger projects into individual tasks, deliver them in multiple phases, and collaborate with others to ensure timely delivery; Support peers and stakeholders in the product development lifecycle by collaborating with product management, design and analytics; Support the operations and availability of your team's artifacts by creating and monitoring metrics, escalating when needed, and supporting on-call efforts; Contribute to team community through growth and development activities such as participation in the interview process

Requirements

2+ years of experience as a software engineer; Experience designing, developing and launching backend systems and proficiency in one of Python or Kotlin; Familiar with the building blocks of distributed systems and technologies such as AWS, MySQL, Redis/Valkey, Terraform and Kubernetes; Have worked on Redis, Valkey or a comparable in-memory store in production and understand replication, persistence, cluster mode, eviction, and their failure modes; Can reason about a caching workload end to end: hit rates, tail latency, hot keys, stampedes, and consistency with the source of truth; Experience automating infrastructure operations with Terraform, Kubernetes and Python, and prefer tested playbooks over manual runbooks; Experience carrying on-call for a stateful service and can take an incident from metrics to root cause to a durable fix; Mastered taking a simple problem or business scenario into a solution that interacts with multiple software components, and executing on it by writing clear, easily understood, well tested and extensible code; Comfortable navigating a large code base, debugging others' code, and providing feedback through code reviews; Demonstrated experience taking ownership of your growth, proactively seeking feedback from your team, manager, and stakeholders; Strong verbal and written communication skills that support effective collaboration with a global engineering team

Benefits

100% subsidized medical coverage, dental and vision for you and your dependents; Monthly stipends for health, wellness and tech spending; Eligibility for equity rewards offered by Affirm Holdings, Inc.; Flexible time off and generous holiday calendars; Employee stock purchase plan (ESPP) to buy Affirm stock at a discount