System design

System-level design artefacts that span multiple modules or apply to an entire system domain. These are produced by architects and tech leads, not by individual module implementations.

Design artefacts

Artefact	Description
Event catalogue	All 48 EventBridge domain events across 8 buses — typed field schemas, emitting module, named consumers
Interface contracts	Synchronous module-to-module Lambda invocation contracts — request/response shapes
Data models	Authoritative Postgres and Snowflake schema per system domain

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System domains

Each system domain has its own data model, event bus, and module set. SD references below link to the compiled system domain page in the systems register.

ID	System	Repo	Data model	Modules
SD01	Core Banking	bank-core	Data model	MOD-001 to MOD-008, MOD-073, MOD-074
SD02	KYC Platform	bank-kyc	Data model	MOD-009 to MOD-020, MOD-055, MOD-096
SD03	AML Monitoring	bank-aml	Data model	MOD-021 to MOD-031
SD04	Payments	bank-payments	Data model	MOD-022 to MOD-030, MOD-061, MOD-071, MOD-072, MOD-081, MOD-082, MOD-084
SD05	Credit	bank-credit	Data model	MOD-051 to MOD-060
SD06	Risk Platform	bank-risk-platform	Data model	MOD-032 to MOD-041, MOD-056 to MOD-060, MOD-080, MOD-085, MOD-086, MOD-088, MOD-089, MOD-092, MOD-094, MOD-095, MOD-098
SD07	Data Platform	bank-platform	Data model	MOD-042 to MOD-050, MOD-062, MOD-063, MOD-075, MOD-076, MOD-079, MOD-087, MOD-093, MOD-097, MOD-099
SD08	App	bank-app	Data model	MOD-064 to MOD-078, MOD-083, MOD-090, MOD-091

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Event buses

One EventBridge bus per system domain. See Event catalogue for all events.

Bus	System domain	Pattern prefix
bank-core	SD01 Core Banking	bank.core.*
bank-kyc	SD02 KYC Platform	bank.kyc.*
bank-aml	SD03 AML Monitoring	bank.aml.*
bank-payments	SD04 Payments	bank.payments.*
bank-credit	SD05 Credit	bank.credit.*
bank-risk-platform	SD06 Risk Platform	bank.risk.*
bank-platform	SD07 Data Platform	bank.platform.*
bank-app	SD08 App	bank.app.*