Senior Software Engineer

We're looking for a Senior Software Engineer to join our FinOps team in London. ASOS runs a large Azure estate behind a platform used by millions of customers, and every architectural decision made across our engineering teams has a cost attached to it. FinOps exists to make that cost visible, attributable and actionable, helping engineering teams understand what their services cost and make better technical decisions. This is an engineering role, focused on building and running the platforms, data products and tooling that enable ASOS to understand and optimise cloud usage. At this level, you'll take ownership of complex, high-impact problems, help shape technical direction and deliver reliable solutions into production. You'll work closely with Senior Engineers, Engineering Leads, Finance and Product Delivery Teams to build capabilities that are trusted and used across ASOS. What You'll Be Doing Design and deliver the data products that make Azure cost visible and attributable across ASOS, including cost and usage pipelines, allocation and showback models, anomaly detection and reporting surfaces. Own the cost and usage data platform on Databricks, ingesting Azure Cost Management exports, reservation and Savings Plan data, resource inventory and tagging metadata into Delta Lake and modelling it into trusted datasets. Build and own Power BI semantic models behind cost reporting, including DAX measures, composite and DirectQuery designs, with model definitions managed as code through TMDL and XMLA. Lead optimisation work across the estate, including right-sizing, autoscaling, storage tiering, data transfer and egress patterns and orphaned resource cleanup. Own the platform the FinOps data products run on: Azure Functions, infrastructure as code in Bicep, managed identities and RBAC, multi-environment CI/CD in GitHub Actions, and the monitoring and alerting that keep it reliable in production, applying DevOps practices end to end. Engage directly with Product Delivery Teams, reviewing architectures, quantifying trade-offs and helping teams make efficient technical decisions. Build guardrails around cost allocation and cloud usage, including tagging policies, Azure Policy, budgets and exception reporting. Develop unit economics that connect cloud spend to business value, such as cost per order, customer or request. Support forecasting, budgeting and variance analysis with Finance and help explain movements in cloud spend. Set technical direction for FinOps engineering, contributing to architecture and design decisions and supporting other engineers through code reviews, design reviews and mentoring. Help shape how FinOps uses agentic AI, experimenting with tools such as GitHub Copilot and Claude Code to improve investigation, development and reporting workflows. Write high-quality, well-tested code and work with Cyber Security to ensure access, security and compliance requirements are embedded into the platform. Beyond technical…