Starling Business Bank Integration for PayCIS Payroll Functions.

PeoplePerHour Job Post – Starling Business Bank Integration for PayCIS

About PayCIS
PayCIS is an online platform that construction companies use to manage payments to their subcontractors under the UK Construction Industry Scheme (CIS).
Subcontractors submit their hours or job-rate, the contractor approves the amounts, and PayCIS calculates the final payment values including CIS deductions.

At the end of the process, the contractor simply needs to pay the subcontractors the net amounts.

We want to automate this final step.

What We Want to Build

We want contractors to be able to:

Connect their own Starling Business bank account to PayCIS

Approve a list of subcontractor payments (already generated inside PayCIS)

Have PayCIS automatically send multiple Faster Payments from the contractor’s Starling account:

One payment per subcontractor

One additional payment to PayCIS for our platform fee

Track the status of each payment through Starling’s webhook notifications

No money should ever pass through PayCIS.
All payments come directly from the contractor’s own Starling Business account.

Work Required
1. Starling Account Connection (OAuth)

Create a “Connect Starling Business Account” button inside PayCIS

Implement Starling’s OAuth flow

Store the returned account identifiers and tokens securely

Display connection status to the user

2. Sending Payments After Contractor Approval

When a contractor approves a payment run inside PayCIS:

Use Starling’s API to send a separate Faster Payment for each subcontractor

Include an additional payment for the PayCIS fee

Handle 5–50 payments per run

Implement:

Idempotency keys

Error handling

Retry logic

Recording each payment’s Starling payment ID

There is no bulk API call in Starling — you will trigger multiple individual API calls in sequence or asynchronously.

3. Webhooks for Payment Outcomes

Implement endpoints for Starling to send payment status updates

Update each subcontractor’s payment record inside PayCIS as:

Paid

Failed (with reason)

Update the PayCIS fee payment as well

4. Security & Documentation

Store tokens safely

Log Starling API requests/responses

Provide technical notes for our internal developer

What We Will Supply

Access to our staging environment

Clear API/endpoint documentation for where you plug the Starling actions into our system

Test payment runs

Any data structures you need

Ideal Skills

Experience integrating with bank APIs

OAuth flows

REST APIs & Webhooks

Strong reliability/error-handling mindset

Fintech experience is a bonus but not required

Outcome

Contractors will be able to pay all subcontractors in a few seconds directly from their own Starling Business account, with PayCIS automatically handling the payment sequence and tracking all results.