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.

Requirements

What You'll Be Working On

• Reading data directly from a legacy SQL schema

• Mapping legacy entities to current API models

• Building migration workflows that can start, stop, resume, and retry

• Tracking migration progress and failures

• Handling large migrations that may run for hours or days

• Working through cases where source and target systems don't map cleanly

• Integrating with payment, merchant, user, subscription, and token-related data

Some payment data may require access to encrypted values within the source environment before being sent to the destination platform.

Tech Stack

• TypeScript / Node.js

• SQL

• REST APIs

• Docker

• Kubernetes

What We're Looking For

• Strong TypeScript and Node.js experience

• Data migration and ETL experience

• Seasoned Experience with Docker and Kubernetes in production

• Comfortable working directly with relational databases

• Experience building backend services and long-running background processes

• Good systems design instincts around reliability, observability, and recovery

• Able to work through incomplete requirements and messy legacy systems without needing everything specified up front

Bonus Points

• Payments or fintech experience

• Experience with PHP (in order to reverse engineer any undocumented legacy API interactions)

Highlights

This is a good fit for someone who enjoys understanding existing systems, figuring out where the edge cases are, and building software that operators can trust to move critical data correctly.