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.

Originally posted on Himalayas