Skill Profile

Event Sourcing

Event store, projections, snapshots, CQRS, temporal queries

Architecture & System Design Event-Driven Architecture

Roles

where this skill appears

Levels

structured growth path

Mandatory requirements

the other 2 optional

Architecture & System Design

Event-Driven Architecture

3/17/2026

Choose your current level and compare expectations. The items below show what to cover to advance to the next level.

What is Expected at Each Level

The table shows how skill depth grows from Junior to Principal. Click a row to see details.

Role	Required	Description
Blockchain Developer		Understands basic Event Sourcing architectural concepts. Follows team architectural decisions. Understands core patterns.

Role	Required	Description
Blockchain Developer		Applies Event Sourcing when designing components. Understands trade-offs. Participates in architectural discussions.

Role	Required	Description
Blockchain Developer	Required	Designs event-sourced ledger systems where on-chain transactions serve as the immutable event log. Makes ADRs on event schema versioning for smart contract state reconstruction. Evaluates CQRS projections for indexing blockchain events into queryable read models.
Solutions Architect	Required	Designs event-sourced aggregates with snapshotting and event upcasting strategies. Makes ADRs on event store selection (EventStoreDB, Marten, Axon) and partitioning schemes. Evaluates consistency guarantees across projections and process managers.

Role	Required	Description
Blockchain Developer	Required	Defines event sourcing strategy for decentralized applications combining off-chain event stores with on-chain finality. Establishes guidelines for event replay, chain reorganization handling, and cross-chain event correlation. Conducts architecture reviews of event-driven indexer and subgraph designs.
Solutions Architect	Required	Defines product-wide event sourcing strategy including event catalog governance and schema registry integration. Establishes architecture guidelines for saga/choreography patterns and eventual consistency SLAs. Conducts reviews of event-driven systems ensuring idempotency, ordering guarantees, and replay safety.

Role	Required	Description
Blockchain Developer	Required	Defines organizational architectural strategy. Designs reference architectures. Establishes architecture governance.
Solutions Architect	Required	Defines the organization's architectural strategy. Designs reference architectures. Establishes architecture governance.

Junior 1 requirements

Blockchain Developer

Understands basic Event Sourcing architectural concepts. Follows team architectural decisions. Understands core patterns.

Middle 1 requirements

Blockchain Developer

Applies Event Sourcing when designing components. Understands trade-offs. Participates in architectural discussions.

Senior 2 requirements

Blockchain Developer
Required

Designs event-sourced ledger systems where on-chain transactions serve as the immutable event log. Makes ADRs on event schema versioning for smart contract state reconstruction. Evaluates CQRS projections for indexing blockchain events into queryable read models.
Solutions Architect
Required

Designs event-sourced aggregates with snapshotting and event upcasting strategies. Makes ADRs on event store selection (EventStoreDB, Marten, Axon) and partitioning schemes. Evaluates consistency guarantees across projections and process managers.

Lead / Staff 2 requirements

Blockchain Developer
Required

Defines event sourcing strategy for decentralized applications combining off-chain event stores with on-chain finality. Establishes guidelines for event replay, chain reorganization handling, and cross-chain event correlation. Conducts architecture reviews of event-driven indexer and subgraph designs.
Solutions Architect
Required

Defines product-wide event sourcing strategy including event catalog governance and schema registry integration. Establishes architecture guidelines for saga/choreography patterns and eventual consistency SLAs. Conducts reviews of event-driven systems ensuring idempotency, ordering guarantees, and replay safety.

Principal 2 requirements

Blockchain Developer
Required

Defines organizational architectural strategy. Designs reference architectures. Establishes architecture governance.
Solutions Architect
Required

Defines the organization's architectural strategy. Designs reference architectures. Establishes architecture governance.

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