Drupal 7 FabricJS product designer website - needs modifications

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Drupal 7 FabricJS product designer website - needs modifications
We currently have a D7 e-commerce website that resides on AWS. Over the course of the last few years we have had a few different developers make modifications. We are looking for a developer that make some incremental upgrades to a multi-form e-commerce workflow with a FabricJS designer.
Our backend uses AWS SQS messaging to receive the saved FabricJS JSON (post Drupal Commerce checkout) and creates PDF files (PDF kit). This is a service managed via NodeJS on a separate host.
We are looking for the following initial changes:
1) Multi form fails to commit saves at certain points in the workflow (Fabric components)
2) Multi form fails to follow the correct logic when displaying uploaded images
3) Emojis are correctly stored in the UTF8 tables, but the PDFKit (NodeJS) does not recognise them.
4) FabricJS object gallery has some memory leaks
We are not looking for a re-vamp of the underlying infrastructure, just incremental changes for now.
The developer must have strong Drupal 7, FabricJS, NodeJS and have a deep understanding of the AWS services: Elasticbeanstalk, EC2, S3, CloudFront, SQS and Lambda.
Skills:
node.js
, Drupal
, NoSQL Couch & Mongo
, Amazon Web Services
, JavaScript

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