Architecture Reference Blueprint
High-Reliability Enterprise Webhook Dispatch System
Deliver billions of customer webhooks reliably with cryptographic signatures, automated retry backoff, and self-serve developer debugging logs.
System Constraints
Non-Negotiable Architecture Constraints
Component Topology
System Components & Technologies
Modular subsystems designed with decoupled responsibilities, clear contracts, and scalable storage layers.
High-Reliability Enterprise Webhook Dispatch System Stack Topology
Event Publisher
Distributed Dispatch Workers
Webhook Delivery Log Store
Developer Webhook Portal
Event Publisher
Capturing domain events and queuing webhook deliveries
FastAPI / Node.js + Redis
Distributed Dispatch Workers
Asynchronous HTTP delivery workers with strict concurrency limits
Golang Worker Pool + Temporal.io
Webhook Delivery Log Store
Storing request headers, response bodies, and latency metrics
PostgreSQL / ClickHouse
Developer Webhook Portal
Testing endpoints, inspecting payloads, and viewing retry attempts
Next.js 15 App Router
Data Lifecycle
End-to-End Data Flow Sequence
Application publishes domain event (e.g., payment.succeeded) to internal Redis queue.
Dispatch Worker looks up customer's registered webhook endpoints and secret signing keys.
Worker computes HMAC-SHA256 signature, attaching Stripe-Signature compatible headers.
Worker sends HTTP POST with strict 5-second timeout; records status code and response latency.
If customer endpoint returns 5xx or times out, Temporal schedules retry with exponential backoff and jitter.
Reliability & Resilience
Failure modes & automated mitigations
Slow Customer Endpoints Exhausting Worker Threads
Enforce strict 5-second HTTP timeouts and dedicate isolated worker pools per customer to avoid head-of-line blocking.
Customer Endpoint Outage Flooding Retry Queues
Automatically disable endpoints returning continuous 5xx errors for > 24 hours, notifying developer via email.
SSRF (Server-Side Request Forgery) Attacks
Validate and block webhook URLs resolving to internal private IP ranges (127.0.0.1, 10.0.0.0/8, 169.254.169.254).
Architecture FAQs
Frequently asked blueprint questions
Retries occur with increasing delays (e.g. 5s, 1m, 15m, 1h, 6h, 24h) plus randomized jitter to prevent thousands of retries hitting an endpoint at the exact same instant.
Customers compute an HMAC-SHA256 hash of the payload using their secret key and compare it with the signature header sent with the webhook.
Senior engineering teams that build for long-term production health
Schedule an architecture session to review your requirements, cloud budget, and implementation timeline.