Serverless Webhook Processing System
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About this role
Data Processing, Cloud Computing, Backend Development, Documentation, AWS Lambda, Continuous Integration, DevOps, API Development, Microservices, Payment Processing · 2. Serverless Payment Webhook Processing System
Category: Cloud Computing / Backend Development Budget: £1,200 GBP — Fixed Price, 3 Milestones Project deadline: Thursday, 8 October 2026
Description: Looking for a backend/cloud engineer to build a serverless system that receives, verifies, and processes payment provider webhooks (e.g. charge succeeded, refund issued, subscription cancelled) and updates internal records accordingly. The system needs to handle signature verification, retries on failure, and idempotent processing so duplicate webhook deliveries don't cause double-processing. No physical or client-facing deliverables — purely backend/event-processing infrastructure.
Key requirements: • Experience building serverless functions (AWS Lambda, Azure Functions, or GCP Cloud Functions) • Understanding of webhook signature verification and idempotency patterns • Comfortable working with event-driven, asynchronous processing pipelines • Available for a short, focused delivery window
Deliverables: • Working webhook receiver and processing pipeline • Signature verification and idempotency handling • Short handover document covering retry logic and failure monitoring
Payment S