Platform Software Engineer

About this role

Avant is looking for a Platform Software Engineer to help shape the future of our financial technology platform and who thrives at the intersection of application development and platform thinking. This is not a pure infrastructure role—you’ll work at the application layer, building the shared patterns, libraries, tooling, and standards that every engineering team at Avant relies on.

You’ll bring a cross-platform mindset: comfortable navigating a large Ruby on Rails monolith one day, designing shared service patterns the next, and defining observability standards or governance frameworks in between. You care about making other engineers more productive and see your success reflected in the success of the teams you enable.

This role reports to the Director of Application Platform & Developer Experience and contributes directly to reducing cognitive load, improving monolith reliability, and raising the engineering quality baseline across the organization.

What you’ll do at Avant

Monolith Stewardship & Developer Experience

• Improve code health, reliability, and developer experience within the avant-basic monolith (Ruby on Rails) during its incremental decomposition
• Drive test suite reliability and performance—reducing flakiness, improving runtime, and restoring engineer confidence that green CI means safe to merge
• Implement and evangelize structured logging, tracing, and observability standards across monolith code paths
• Identify and reduce technical debt in high-risk, high-change areas of the codebase
• Contribute to Ruby, Rails, and Sidekiq upgrade readiness by evaluating changesets and resolving known incompatibilities

Shared Platform & Backbone Services

• Build and maintain shared application services used across domains (notifications, configuration, feature flagging, shared middleware and SDKs)
• Design and implement golden path service templates and patterns for communication between the monolith and decomposed services
• Own application-level ...