Senior .NET C# Engineer (3‑Month Contract, Inside IR35)

About the role

We are looking for a Senior .NET C# Engineer to join a fast‑paced three‑month project in London. The role focuses on building and enhancing data ingestion pipelines and search capabilities using Elasticsearch, working with Azure and Kafka technologies. The position is inside IR35 and offers a hybrid working model.

Key responsibilities

• Design and develop ingestion pipelines that consume data from Azure Event Hub and Kafka streams.
• Map incoming data to a canonical model and enrich it with metadata from Kafka sources.
• Extend and maintain existing ingestion templates for Elasticsearch indexing.
• Create and maintain REST APIs that translate UI requests into Elasticsearch queries.
• Collaborate with the engineering team to ensure robust CI/CD pipelines using GitHub Actions.

Required profile

• Recent (within 12 months) hands‑on experience in C#/.NET development at a senior level.
• Proven experience with Elasticsearch indexing and querying.
• Ability to work effectively in a hybrid environment and deliver within a three‑month contract.

Required skills

• C#
• .NET
• Elasticsearch
• Azure Functions
• Azure Event Hub
• Azure Service Bus
• OneLake
• Cosmos DB
• AKS
• Kafka
• GitHub Actions
• CI/CD pipelines

What we offer

• Competitive daily rate of £350‑£375 (inside IR35).
• Hybrid working with office access in London.
• Opportunity to work on high‑impact data and search technologies.