Sr. Node.js / TypeScript Engineer - System Migration (Contract)

We're looking for a senior engineer to build a migration service that moves customers from a legacy payments platform into a core platform.

The source system is a legacy PHP application with a SQL database. The target is a set of REST APIs. The work involves understanding the existing data model, mapping it to the new platform, and building a reliable migration service that can be run repeatedly for different partners.

Migration sizes range from a handful of records to hundreds of thousands.