Event-Driven CRM Guide
Build a CRM that does not suck.
A 140+ page guide to building an event-driven CRM: Kotlin + GraphQL architecture patterns, domain event modeling, activity streams, pipeline automation, and integration patterns. Based on a production CRM serving enterprise clients.
Inside the guide
What You'll Learn
Domain Event Modeling
ContactCreated, DealMoved, ActivityLogged events — immutable audit trail by default.
GraphQL + Kotlin Patterns
DGS framework, N+1 prevention with DataLoader, subscription websocket setup.
Pipeline Automation
Rule engine for automatic stage transitions, task creation, and notification triggers.
Activity Stream
Fan-out-on-write vs. fan-out-on-read tradeoffs for contact timeline feeds.
Integration Patterns
Email sync (IMAP/SMTP), calendar integration, and webhook outbox pattern.
Table of Contents
Who This Is For
Written by engineers, for engineers
Senior Engineer
Building production systems and tired of re-inventing the wheel on every project.
Software Architect
Needs battle-tested patterns to back architectural decisions with evidence.
Startup CTO
Must ship fast without accumulating technical debt that kills you later.
The Problem
CRUD-based CRMs become unmaintainable at 50K+ contacts with complex workflows
Event sourcing for sales pipelines is sparsely documented outside conference talks
GraphQL subscriptions for real-time activity feeds have no good production examples
Get Instant Access
One-time payment. Instant PDF download.
Personal License
- 140+ page PDF
- Kotlin code examples
- Architecture diagrams
- Lifetime updates
Frequently Asked Questions
Do I need to use Kotlin?
No. Kotlin is used for examples but the event-driven architecture patterns apply to any language.
How is this different from a Salesforce guide?
This is for teams building a CRM, not using one. It covers internal architecture, not admin configuration.