Microsoft Azure Cosmos DB Developer Specialty

The Microsoft Azure Cosmos DB Developer Specialty (DP-420) certification validates deep expertise in designing, implementing, and monitoring cloud-native applications that store and manage data using Azure Cosmos DB. Candidates learn to design data models optimized for the NoSQL paradigm, implement multi-region write strategies, tune performance using partition keys and indexing, and integrate Cosmos DB with other Azure services. This specialty certification is valued by developers building globally distributed, low-latency applications.

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What is the Microsoft Azure Cosmos DB Developer Specialty (DP-420) Certification?

Who Should Take This Course?

Application developers building globally distributed NoSQL applications on Azure
Cloud architects designing data models for Azure Cosmos DB workloads
Backend engineers integrating Cosmos DB with microservices and serverless apps
Data engineers implementing change feed and event-driven data pipelines
DevOps engineers optimizing and monitoring Cosmos DB throughput and costs
Software architects choosing between Cosmos DB APIs for specific use cases

What You Will Learn in the DP-420 Course

A comprehensive curriculum covering all exam objectives with hands-on labs and real-world practice.

Design and Implement Data Models

Design NoSQL data models and partition strategies for Cosmos DB.

Cosmos DB for NoSQL — documents, containers, and databases
Partition key selection — cardinality, write distribution, and hot partitions
Data modeling patterns — embedding vs. referencing, denormalization
Choosing the right Cosmos DB API — NoSQL, MongoDB, Cassandra, Gremlin, Table
Hierarchical partition keys and sub-partitioning strategies

Design and Implement Data Distribution

Configure global distribution, consistency, and replication in Cosmos DB.

Global distribution — adding/removing regions and automatic failover
Consistency levels — eventual, consistent prefix, session, bounded staleness, strong
Multi-region writes and conflict resolution policies
Service-managed and customer-managed failover configurations
Availability zone redundancy and high availability design

Integrate an Azure Cosmos DB Solution

Build applications and pipelines that integrate with Cosmos DB.

Azure Cosmos DB SDK for .NET and Python — CRUD operations and bulk execution
Change feed processor — real-time event processing and downstream triggers
Azure Functions Cosmos DB trigger and bindings
Cosmos DB with Azure Synapse Analytics Link — analytical store
Integrating Cosmos DB with Azure Search for full-text indexing

Optimize an Azure Cosmos DB Solution

Tune performance, indexing, and cost of Cosmos DB workloads.

Request units (RUs) — measuring and provisioning throughput
Serverless vs. provisioned throughput and autoscale configuration
Indexing policy — included/excluded paths, composite, and spatial indexes
Query optimization — cross-partition queries and continuation tokens
Monitoring — Azure Monitor metrics, diagnostics logs, and cost analysis

Maintain an Azure Cosmos DB Solution

Secure, back up, and maintain Azure Cosmos DB deployments.

Role-Based Access Control (RBAC) for Cosmos DB data plane operations
Customer-managed keys (CMK) and encryption at rest
Continuous and periodic backup and point-in-time restore
Azure Private Link and network isolation for Cosmos DB
Data migration — Azure Database Migration Service and custom tools

Course Prerequisites

Pre-requisites training is free when you purchase the course from ProSupport

Proficiency in C#, Java, Python, or JavaScript for SDK-based development
1+ year of experience developing cloud applications on Azure
Understanding of NoSQL database concepts — documents, key-value, and graph
Azure Developer Associate (AZ-204) or equivalent Azure development experience
Familiarity with REST APIs and cloud-native application patterns
Azure Data Fundamentals (DP-900) recommended but not required

Exam Information

Everything you need to know about the DP-420 certification exam.

Exam Component	Details
Exam Name	Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB
Exam Code	DP-420
Exam Type	Multiple Choice, Case Studies, Drag-and-Drop, Active Screen
Total Questions	40–60
Passing Score	700 (out of 1000)
Exam Duration	120 minutes
Language	English, Japanese, Chinese (Simplified), Korean
Exam Provider	Microsoft / Pearson VUE
Exam Focus	Designing, implementing, optimizing, and maintaining Azure Cosmos DB cloud-native solutions
Exam Registration	Register at microsoft.com/en-us/learning or via Pearson VUE testing centers
Retake Policy	24 hours before first retake; 14 days before subsequent retakes; 5 attempts per year
Certification Validity	1 year — renewable via free online renewal assessment on Microsoft Learn