Azure Cosmos DB Developer

Azure Cosmos DB Developer - Financial Markets & Data Platform Transformation Hybrid | Central London (1-3 days per week onsite) 6-Month Initial Contract ASAP Start £460 per day (Inside IR35) We are seeking an experienced Azure Cosmos DB Developer to join a leading global financial markets infrastructure and data organisation on a major transformation programme. This is an exciting opportunity to play a key role in modernising critical application and data engineering platforms, working with cutting-edge Azure technologies, cloud-native architectures, and large-scale data solutions. You'll be responsible for designing, developing, and optimising high-performance Cosmos DB solutions while contributing to enterprise-scale data engineering initiatives across Microsoft Azure and Microsoft Fabric. The Role Working within a highly technical engineering environment, you will help drive the adoption of modern cloud-native solutions and best practices across application development, data engineering, and platform delivery. This position requires a strong understanding of Azure Cosmos DB, distributed computing concepts, and data pipeline development, alongside the ability to collaborate effectively with architects, DevOps teams, and stakeholders across the business. Key Responsibilities Develop cloud-native applications leveraging Azure Cosmos DB (SQL API and Mongo API).Design efficient NoSQL data models aligned to application and business requirements.Optimise Cosmos DB queries, throughput management, and RU consumption.Implement effective partitioning, indexing, and consistency strategies.Build and maintain robust CI/CD pipelines using GitLab DevOps.Develop scalable and performant solutions using Cosmos DB SDKs.Integrate Cosmos DB within microservices architectures.Design and implement PySpark data pipelines on Microsoft Fabric.Utilise Cosmos DB Change Data Feed (CDF) for real-time and event-driven processing.Develop automated testing frameworks and maintain unit and integration tests using PyTest.Collaborate with engineering, architecture, and DevOps teams to deliver enterprise-scale solutions.Ensure solutions adhere to security, governance, and regulatory requirements. Essential Skills & Experience Strong hands-on experience with Azure Cosmos DB, including: query optimisation; throughput management; partitioning strategies; indexing optimisation; consistency modelsProven experience working with Cosmos DB Change Data Feed (CDF).Experience integrating and troubleshooting Spark with Cosmos DB CDF.Strong technical expertise in PySpark and distributed computing concepts.Experience developing and optimising NoSQL data models.Proficiency with Azure Cosmos DB SDKs such as: Python; .NET; Java; Node.jsStrong experience with PyTest and automated testing practices.Knowledge of concurrency patterns, scalable application design, and high-performance systems.Experience with Git, source control, and CI/CD tooling.Excellent problem-solving, communication, and stakeholder management skills. Desirable Experience Advanced development experience with: C#, ASP.NET, .NET CoreStrong object-oriented design and software engineering principles.Experience within financial services, capital markets, or highly regulated environments. If you're an experienced Azure Cosmos DB Developer looking to work on high-impact cloud and data engineering initiatives within a complex enterprise environment, we'd love to hear from you. Please apply promptly to be considered.