Java Application Developer

Seeking a Java developer to either remediate faults in an existing server application or rewrite from scratch. The server is a transactional application that processes and/or issues instructions via interactions with 4 key clients. These clients have this function:

1. Main client (high volume) - a) requests transactions and receives response output; b) receives asynchronous instructions of updates to transaction;
2. Service client (medium volume) - a) asynchronous requests to update transactions; b) asynchronous requests to reverse or void prior updates to transaction;
3. Reconciliation client (daily) - file transfer containing aggregated data to be reconciled against the activity notified asynchronously from client 2.
4. File Upload client (daily or less) - an sFTP location to upload file of related instructions based on activity arising from client 2.

In addition the servlet needs a web interface so that it can be administered, including the setup of unique accounts against which transactions are assigned. Via a database it must store and update the state of transactions and an aggregated view of each unique account (i.e. balance).

This must be written in such a way that the application can be load balanced (run active active) and lightweight/high scalable. The server should ideally support Tomcat and use a MySQL DB (or other supported via Hibernate or JPA). Evidence of work with transactional systems a plus!

A 3 page introduction and statement of work exists containing process descriptions, inputs and outputs, outline of problems with existing server, guidance on re-usable components, and other useful material. It can be issued *following* any initial discussion to help formalise estimates.

Subsequent to review of the full statement of work, a proposal should outline the preferred (most efficient / least-cost) approach to addressing, whether via remediation or re-write. We can offer desk-space and dev/testing environments to any freelancer who can work onsite in Bath, UK.