Azure Cosmos DB Developer – Contract – Hybrid (London) Azure | Cosmos DB | Spark | PySpark | C# | .NET | AKS | CI/CD

We are seeking a hands-on Azure Cosmos DB Developer to join a high-profile cloud-native data transformation programme within financial services. This is a contract opportunity working on scalable, production-grade Azure microservices and distributed data platforms.

You will design and optimise Azure Cosmos DB (SQL API) solutions, focusing on query optimisation, RU consumption, throughput management, partitioning strategies and indexing performance. The role also involves integrating Cosmos DB Change Data Feed (CDF) with Spark / PySpark in distributed environments.

Key Responsibilities:

* Develop cloud-native applications using Azure Cosmos DB

* Implement partitioning, indexing and consistency models

* Optimise queries to reduce RU and improve latency

* Integrate Cosmos DB Change Feed with Spark

* Build services using C# / .NET Core or Node.js

* Deploy solutions via Azure Functions, AKS, App Services

* Contribute to CI/CD pipelines (GitLab / DevOps)

Required Skills:

* Strong hands-on experience with Azure Cosmos DB

* Experience with Spark or PySpark

* Knowledge of SQL API, Change Feed, throughput management

* Experience with C#, .NET, Node.js or Python

* Understanding of distributed systems and microservices architecture

* Azure platform experience (AKS, Functions, App Services)

This role suits a senior-level engineer who thrives in performance optimisation, scalable system design, and Azure cloud engineering within enterprise environments.

Apply now to discuss further