Azure Cosmos DB Developer

Job Title: Azure Cosmos DB Developer
Location: London (Hybrid 1 day per week onsite mandatory)
Contract Type: Contract
Duration: 6 Months
Rate: £(Apply online only)/day (Inside IR35)
Industry: Financial Services

Azure Cosmos DB Developer Contract London (Hybrid)

We are seeking an experienced Azure Cosmos DB Developer to join a major global financial services organisation undergoing significant transformation across its application and data engineering landscape.

This is an exciting opportunity to contribute to the modernisation of critical platforms within a highly regulated, enterprise-scale environment.

You will play a key role in delivering high-performance, cloud-native data solutions using Azure services, ensuring scalability, resilience, and operational excellence.

The Role

You will support the transformation of mission-critical systems, driving technical excellence in data engineering and cloud-native development. The role requires strong hands-on expertise in Azure Cosmos DB, Spark, and distributed computing concepts.

Key Responsibilities

• Develop cloud-native applications using Azure Cosmos DB (SQL API & Mongo API)
• Design and optimise NoSQL data models
• Implement partitioning and indexing strategies for performance optimisation
• Optimise RU consumption and query performance
• Work with Cosmos DB Change Data Feed (CDF) and Spark integrations
• Develop reusable libraries using C#/.NET or Node.js
• Build CI/CD pipelines using GitLab
• Implement automated testing frameworks
• Collaborate with architecture and DevOps teams in a microservices ecosystem
• Ensure compliance with security and governance standards

Essential Skills & Experience

• Strong hands-on experience with Azure Cosmos DB
• Query optimisation and throughput management expertise
• Experience with Cosmos DB Change Data Feed (CDF)
• Strong PySpark and Spark distributed computing knowledge
• Experience integrating Spark with Cosmos CDF
• High proficiency with Cosmos DB SDKs (.NET, Java, Python, Node.js)
• Deep understanding of partitioning, indexing, and consistency models
• Experience with Azure services (Azure Functions, App Services, AKS, Logic Apps)
• CI/CD experience (GitLab preferred)
• Strong problem-solving and stakeholder engagement skills

Desirable

• Advanced proficiency in C#, ASP.NET, and .NET Core
• Strong object-oriented design principles

Why Apply?

• Work on enterprise-scale financial platforms
• Contribute to high-impact digital transformation initiatives
• Hybrid working model with flexibility
• Opportunity to shape secure, scalable systems within a regulated environment

If you are a Cosmos DB specialist looking for your next contract engagement within financial services, we would love to hear from you.