ACCELERATOR · BLUEPRINTS

Event Interaction

Design the human and system touchpoints where events become decisions, actions and audit trails.

The Event Interaction blueprint focuses on the layer where asynchronous events meet human workflows and synchronous system boundaries. It defines patterns for event-driven command generation, human-in-the-loop decision points, event sourcing for auditability and CQRS for separating read and write models, solving the interaction challenges that arise when event-driven backends must serve real-time user experiences and regulatory review processes.

emergingAvailable

Key Features

CQRS Read Model Projections

Patterns for building optimised read models from event streams, supporting low-latency queries for dashboards, case management screens and customer-facing status updates.

Human-in-the-Loop Event Patterns

Interaction designs for routing events to human reviewers (e.g. fraud analysts, credit underwriters) with SLA tracking, escalation rules and decision capture back into the event stream.

Event Sourcing for Regulatory Audit

Event store design that provides a complete, immutable history of state changes, satisfying regulatory requirements for decision traceability in lending, KYC and financial crime domains.

Saga and Process Manager Patterns

Long-running process coordination that manages multi-step workflows (e.g. onboarding, remediation) through compensating events rather than distributed transactions.

Use Cases

Fraud Analyst Case Routing

Financial Crime

Routing suspicious transaction events to fraud analysts with enriched context, capturing investigation decisions as events and feeding outcomes back to ML model retraining pipelines.

Lending Application Status Tracking

Lending

Projecting credit application events into a real-time status view for customers and internal operations, with full audit trail of every decision and state transition.

Technical Stack

Apache Kafka / Google Pub/SubEvent Store / PostgreSQL (event sourcing)Kotlin / TypeScriptReact (case management UI patterns)OpenTelemetry

Deliverables

  • →
    Event Interaction Pattern Catalogue(Design document)
  • →
    CQRS and Event Sourcing Reference Implementation(Code repository)
  • →
    Human-in-the-Loop Workflow Specifications(Technical specification)

Expected Programme Outcomes

Time

8–10 weeks

saved on interaction pattern design

Risk & Compliance

87%+

workflow pattern consistency

Cost

3–6 months

of interaction rework avoided

Quality

95%+

across all event-driven domains

Prerequisites

  • →Event-Driven Architecture blueprint adopted or equivalent event infrastructure in place
  • →Identified workflows requiring human decision points or regulatory auditability

Proven in

Case studies that used this accelerator.

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