Lead Software Engineer (.NET + Azure)

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Description

We are seeking a Lead Software Engineer (Deputy Tech Lead) to drive the design and build of a greenfield enterprise integration platform on Microsoft Azure from scratch. In this role, you will combine hands-on implementation with technical leadership—helping architect contract-first integration patterns, setting pipeline quality gates, mentoring engineers, and acting as the Technical Lead’s trusted deputy across a complex, multi-vendor ecosystem for a UK-based sustainability organisation. Responsibilities Architecture & Technical Ownership: Partner with the Integration Architect to build core platform components—contract repositories, API/event catalogues, APIOps pipelines, Azure API Management, Event Hubs, Service Bus, and managed file exchange. Hands-on Delivery: Build, test, and deploy key integrations using C#/.NET and Infrastructure as Code (Bicep/Terraform), ensuring high performance, scalability, and strict security standards (OAuth2, HMAC, Key Vault). Deputy Leadership & Mentorship: Serve as deputy to the Technical Lead—running technical discussions, making day-to-day decisions in their absence, conducting constructive code reviews, and mentoring integration engineers. Cross-Team & Data Platform Alignment: Collaborate closely with the Data Platform team to establish data contracts, operational boundaries, and zero-copy access to source data (Databricks / Microsoft Fabric / Purview). Standards & Vendor Alignment: Enforce contract-first integration standards (OpenAPI,

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