Service Dependency Matrix

FROM \ TO

Gateway

Identity

Advisory

Portfolio

MIA

Distribution

Markets

Payments

Notifications

Estate

Gateway

—

REST

Identity

—

Advisory

—

JWT

—

REST

—

Kafka

—

Kafka

—

Portfolio

—

JWT

Kafka

—

Kafka

—

MIA

—

JWT

REST

—

REST

—

Kafka

—

Distribution

—

JWT

—

Kafka

—

REST

Kafka

—

Markets

—

JWT

—

Kafka

—

Kafka

—

Payments

—

JWT

—

Kafka

—

Notifications

—

JWT

—

Estate

—

JWT

—

REST

—

Kafka

—

Coupling

I=1.00

Coupling

I=0.00

Coupling

I=0.67

Coupling

I=0.60

Coupling

I=0.86

Coupling

I=0.71

Coupling

I=0.60

Coupling

I=0.50

Coupling

I=0.11

Coupling

I=1.00

Total Dependencies

runtime connections across 10 services
23 sync (REST/JWT) • 16 async (Kafka)

Sync : Async Ratio

59:41

Target: <40% sync for resilience
Priority: migrate Portfolio reads to CQRS

Critical Path Length

Gateway → MIA → Advisory → Portfolio
Max latency chain: ~450ms p99

Most Depended-On

Identity

9 services depend on JWT validation
Must maintain 99.99% uptime SLA