Specialty DP-420
Specialty Azure cert for developers designing and building cloud-native applications with Azure Cosmos DB — NoSQL, partitioning, consistency, and indexing.
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The Microsoft Azure Cosmos DB Developer Specialty (DP-420) is the dedicated certification for developers who design and implement cloud-native applications using Azure Cosmos DB. It validates deep expertise in Cosmos DB's data modeling, partitioning strategies, consistency levels, indexing policies, and SDK usage.
The exam covers five domains: Design and Implement Data Models (35–40%), Design and Implement Data Distribution (5–10%), Integrate an Azure Cosmos DB Solution (5–10%), Optimize an Azure Cosmos DB Solution (15–20%), and Maintain an Azure Cosmos DB Solution (25–30%). You must understand Cosmos DB's multi-model API (NoSQL, MongoDB, Gremlin, Table, Cassandra), the request unit (RU) pricing model, change feed, and Cosmos DB's global distribution and multi-region writes.
The DP-420 is a niche but highly specialized certification suitable for backend developers and architects working with globally distributed, low-latency NoSQL databases. It pairs well with the AZ-204 Developer Associate for developers building data-intensive cloud applications on Azure.
“DP-420 was tough. Data modelling, partitioning and security were all covered properly, and I passed first try.”
“Cleared up Cosmos DB concepts I'd been vague on for a long time. Realistic questions, and I could rehearse under exam conditions beforehand.”
Every DP-420 question is written by someone who holds this certification and works in the field — not scraped from other sites, and not generated and shipped unreviewed. Every explanation you are shown has been read and approved by that same expert first.
Backend developers and cloud architects building globally distributed applications using Azure Cosmos DB.
Prerequisites: AZ-204 recommended. Proficiency in C# or Python and experience with NoSQL data modeling.