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CL-321 Cloud & Platform

Microservices & Event-Driven Architecture

Split a system into services that can be changed independently, then connect them with events without inventing a distributed monolith. Learners set boundaries from the domain, choose synchronous or asynchronous per interaction with the availability arithmetic in front of them, implement a saga with compensating actions, and version events through a schema registry. Exactly-once claims are tested against what the infrastructure actually guarantees.

B4Professional
6modules
42skill atoms
3role journeys
Curriculum

What this course covers.

6 modules, 42 named skill atoms. Expand any module to see them.

1Service Boundaries and Coupling7 skill atoms
bounded contexts from the domain not the org chartafferent and efferent coupling measureda shared database as the boundary violationchatty synchronous calls exposing a bad splitdata ownership held by one servicethe distributed monolith trap and its symptomswhen a modular monolith is the right answer
2Synchronous and Asynchronous7 skill atoms
request-response latency stacking across hopstimeouts, retries and circuit breakersretry storms amplifying an outagebulkheads and backpressurefire-and-forget against acknowledged commandsavailability multiplied across synchronous dependenciesasync chosen to decouple deployment not only load
3Event Sourcing and CQRS7 skill atoms
event notification against event-carried state transferthe event log as the source of truthreplaying a log to rebuild stateCQRS read models and eventual consistency windowssnapshots bounding replay timethe cost of these patterns where they are not neededprojections drifting from the log
4Sagas and Distributed Transactions7 skill atoms
two-phase commit and why it is avoidedchoreography against orchestration sagascompensating actions that are not true rollbackssaga state persistence and timeout handlingsemantic locks and pending states in the UIpartial failure visible to the customertesting a saga against injected failures
5Idempotency and Delivery Semantics7 skill atoms
at-least-once as the practical defaultexactly-once as processing illusion not delivery guaranteeidempotency keys and a dedup storetransactional outbox for atomic write and publishconsumer offset commit orderingordering guaranteed only per partition keypoison messages and dead-letter handling
6Schemas, Registries and Versioning7 skill atoms
schema registry with Avro, Protobuf or JSON Schemabackward, forward and full compatibility modesadditive change as the safe defaultconsumer-driven contract testsversioning topics against versioning payloadsdeprecating an event with a migration windowan event catalogue consumers can search
Where it fits

CL-321 in the role journeys.

This course appears in 3 of our 45 role journeys. Here is what a learner takes immediately before and after it in each.

Cloud / Solutions Architect

Professional stage
CL-314→CL-321→SEC-506

Enterprise Architect

Professional stage
CL-223→CL-321→AI-503

Backend Engineer

Professional stage
DEV-204→CL-321→DEV-501

Roles this course serves

Backend EngineerCloud / Solutions ArchitectEnterprise Architect
The capability ladder

This course is authored to band B4.

Every course we run is written to one rung of the CASI ladder, so a plan can be assembled to take a team from where they are to where they need to be.

What do B1–B6 mean?The CASI Capability Ladder — click to expand

Every course targets a band on the CASI Capability Ladder — our six-band proficiency scale, anchored to open standards (O*NET, ESCO, NICE, NIST AI RMF, Bloom's). A band tells you how deep a course goes, and what evidence proves it.

What the learner can doTypical evidence
B1
AwareUnderstands concepts and vocabulary; uses tools with guidance
Knowledge checks
B2
FoundationPerforms standard tasks correctly in familiar contexts
Guided labs, autograded exercises
B3
PractitionerDelivers complete pieces of work independently
Scenario labs, proctored hands-on exams
B4
ProfessionalHandles production-grade complexity, trade-offs and failure modes
Break-fix drills, design defenses
B5
AdvancedEngineers systems end-to-end under constraints; leads others
Rubric-scored capstones, vivas
B6
ExpertSets direction; recognised authority across teams
Portfolio + panel evaluation

A note on B6. Courses in this catalog target B1–B5. B6 is not taught — it is recognised, through a portfolio and a panel, once someone is setting direction for others. Every journey here is built to land a learner at B5.

Related

Other Cloud courses at this level.

CL-202

AWS Solutions Architecture

B4 · Professional
CL-204

AWS Data Engineering

B4 · Professional
CL-212

Azure Solutions Architecture

B4 · Professional
CL-214

Azure Data Engineering

B4 · Professional
CL-222

Google Cloud Data Engineering Bootcamp

B4 · Professional
CL-223

GCP Architecture & Operations

B4 · Professional
Next step

Run CL-321 for your team.

This course runs at several lengths depending on how deep you need to go and how much of it your people already have. Tell us who is being trained and we will scope it.

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