Software Engineer
Job Title: Software Engineer
Department: Engineering & Product Development
Reports to: Engineering Lead
Location: Flexible but Singapore preferred
About Codex
Codex is building the infrastructure for stablecoin-based cross-border payments — moving money faster, cheaper, and more transparently than the legacy financial system. Backed by Circle, Coinbase, Dragonfly, Wintermute, and Cumberland, we're a small team solving hard problems at the intersection of crypto and global payments.
The Role
You'll own Codex's financial partner integrations end-to-end — from API contract and webhook design through to reconciliation and production hardening — and build the automation layer that makes our trading and treasury operations increasingly self-running.
This is a high-ownership role at the infrastructure layer of the business. You'll be adding new payment rails, eliminating manual operational workflows, and designing systems that handle real money reliably across fiat and crypto rails. You'll work directly with the founders and Engineering & Product Development team, and closely with Compliance, Operations, and Financial Partnerships.
