I head the backend development for an Indian company called Baxi and have written a lot of code with ExpressJS. I could help and guide you with whatever you're aiming to achieve with your project.
Relevant Skills and Experience
5 years of overall experience as a developer, written and maintained a high traffic, scalable API (think of it as similar to Uber) using NodeJS, Express with custom auth strategy.
Proposed Milestones
£40 GBP - First code review of existing code and suggestions
£100 GBP - Implementation of suggestions
£75 GBP - Review and testing
£35 GBP - SSO integration
Additional Services Offered
£20 GBP - Development consulting @ 20$ / hour if you want to take the step of moving this towards production
I'd like to hear more about your project, can agree on pricing accordingly.