Senior Time-Series Engineer

Senior Time-Series Engineer (Python or .NET) – Contract £550/day Hybrid (Watford) 4 Months Outside IR35 We’re supporting a technology-led organisation building high-throughput, event-driven systems operating at scale. They are looking for 2 Senior Engineers (1 Python, 1 .NET/C#) to work on a time-series focused platform powering real-time data ingestion, storage, and analytics. This is not a standard backend role. If you haven’t actually worked hands-on with time-series data in production, this won’t be the right fit. What You’ll Be Doing • Building API-driven backend services handling high transactional workloads • Designing and optimising time-series data pipelines (ingestion → storage → query) • Working with event-driven architectures using Azure Service Bus • Modelling time-series datasets for performance and scalability • Implementing retention policies, partitioning strategies, and downsampling • Optimising query performance across large-scale datasets • Deploying services into Azure (AKS, Functions, App Services) Core Requirements (Non-Negotiable 🚨) • Proven, hands-on experience with time-series data in productionNot theoretical • Not “touched it once” • You’ve built, scaled, and optimised it • Experience with: • InfluxDB and/or Azure Data Explorer (ADX / Kusto) • Kusto Query Language (KQL) (for ADX users) • Strong understanding of: • Time-series data modelling • Ingestion pipelines • Query optimisation • Partitioning strategies • Hot vs cold data layers • Retention & downsampling Tech Environment • Python or C# / .NET • Azure (AKS, Functions, App Services, Storage) • Azure Service Bus (event-driven systems) • Docker / Kubernetes • Azure Monitor / App Insights / Datadog • GitHub Actions (CI/CD) What They’re Looking For • Engineers who have worked on long-lived, production platforms • Strong focus on reliability, scalability, and performance • Comfortable operating in high-load, distributed systems • Able to explain real implementations, not just concepts Why This Role • Proper engineering challenge (not CRUD/web apps) • Work on real-time, high-volume data systems • High-impact project with immediate demand for delivery • Outside IR35, strong rates, quick turnaround If you’ve genuinely built and scaled time-series systems, this is a very strong contract. If you haven’t, this one won’t land.