DEV-203 Development

Java Microservices with Spring Cloud

Design, build and operate a set of collaborating Java services without recreating a distributed monolith: decomposition by business capability, configuration and discovery, resilience patterns, tracing and contract testing. Learners run a multi-service system, break it deliberately, and make it survive. The course is explicit about when microservices are the wrong answer.

B4Professional

6modules

42skill atoms

1role journey

Curriculum

What this course covers.

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

1Decomposition and Service Boundaries7 skill atoms

bounded contexts and business capability slicingshared database as the classic anti-patterndata ownership per servicesynchronous vs event-driven collaborationaggregate boundaries and eventual consistencythe distributed monolith failure modeknowing when a modular monolith wins

2Configuration, Discovery and Gateway7 skill atoms

Spring Cloud Config and Kubernetes ConfigMapsrefresh scope and config driftservice discovery with Eureka or DNSSpring Cloud Gateway routing and filtersclient-side load balancingsecret management and rotationenvironment parity across dev, stage and prod

3Resilience Patterns7 skill atoms

timeouts on every remote callretries with jitter and idempotency requirementsResilience4j circuit breakers and bulkheadsrate limiting and backpressurefallbacks that degrade honestlyretry storms and cascading failurechaos experiments against a running system

4Observability and Distributed Tracing7 skill atoms

OpenTelemetry instrumentationMicrometer metrics and RED signalstrace and span propagation across servicescorrelation ids in structured logssampling strategy and costdashboards and alert thresholds that page a humandebugging a slow request across four hops

5Contract Testing and Delivery Topology7 skill atoms

consumer-driven contracts with Spring Cloud Contract or Pactprovider verification in CIbackward-compatible API evolutionversioning and deprecation policycontainerised deploys and rolling updatesblue-green and canary releasedatabase migrations decoupled from service deploys

6AI Across Service Boundaries7 skill atoms

the assistant scaffolds a service skeleton in minutesit cannot see the other services or their contractsgenerated clients that ignore timeouts and retriesplausible resilience config with wrong thresholds for your trafficusing AI on one repository while the failure spans severalverifying with contract tests and a real tracesystem-level correctness stays with the engineer

Where it fits

DEV-203 in a role journey.

This course appears in 1 of our 45 role journeys. Here is what a learner takes immediately before and after it in each.

Java Developer

Professional stage

DEV-202→DEV-203→DEV-204

Roles this course serves

Java Developer

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

AwareUnderstands concepts and vocabulary; uses tools with guidance

Knowledge checks

FoundationPerforms standard tasks correctly in familiar contexts

Guided labs, autograded exercises

PractitionerDelivers complete pieces of work independently

Scenario labs, proctored hands-on exams

ProfessionalHandles production-grade complexity, trade-offs and failure modes

Break-fix drills, design defenses

AdvancedEngineers systems end-to-end under constraints; leads others

Rubric-scored capstones, vivas

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.

Other Development courses at this level.

DEV-202

Run DEV-203 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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Java Microservices with Spring Cloud

What this course covers.

DEV-203 in a role journey.

Java Developer

Roles this course serves

This course is authored to band B4.

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Run DEV-203 for your team.