We're seeking an experienced, senior back-end engineer to help develop the core platform surrounding our Workplace and TPA products. You'll work across our Rails system of record, data connectivity layer, and major feature development — the platform that runs real 401(k) plans for advisors and their business owner clients.

What makes this role different from most Rails jobs: our platform is operated by both people and AI agents. The same APIs, actions, and workflows serve human users and the agents automating our administration work, so clean contracts, permissions, staging-before-commit patterns, and audit trails are product features, not afterthoughts. You'll build the surfaces agents act through, along with the right guardrails for a complex fiduciary business.

You'll join a small, tight-knit team in a flat hierarchy inspired by the Shape Up framework, participate fully from shaping through shipping, and report to our Director of Engineering.

Own major feature development end-to-end across our products, from design doc through deployment and monitoring.

Build the tool surfaces our agents act through: typed, permissioned, logged actions against our system of record, with staging-and-promote patterns so nothing writes to a plan without a gate.

Design and run our data connectivity layer: recordkeeper feeds, payroll providers, payments, and identity.

Make auditability a priority so that every action, human or agent, is traceable, explainable, and regulator-ready.

Lead architectural discussions, write design docs, and mentor through code review.

Ruby on Rails / PostgreSQL on AWS ECS

React & TypeScript on the front-end

Redshift + dbt + Metabase; PostHog for analytics

Stripe, WorkOS, HubSpot, Customer.io

Software Engineer (Back End)

Responsibilities

Qualification

Required

Preferred

Benefits

Company

Aboon

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