Principal Software Engineer

In this Principal Software Engineer role, you drive engineering excellence across front-end and back-end systems, shaping scalable architectures and guiding multi-disciplinary teams. You’ll foster a diverse, inclusive engineering culture while accelerating the agentic commerce initiative powered by AI agents. You translate bold concepts into production-ready proof of concepts, collaborating with industry partners and stakeholders. This role combines hands-on delivery with strategic influence to impact millions of customers shopping fashion online.

• employee discount
• employee sample sales
• 25 days paid annual leave
• discretionary bonus scheme
• private medical care scheme
• flexible benefits allowance

• Accelerate our agentic commerce journey by delivering rapid proof-of-concept prototypes for AI agents that discover, recommend and buy fashion
• Build relationships with technology partners, AI platform providers and industry groups to influence the development of agentic commerce
• Shape the technical foundations for agents (APIs, data, identity, payments, trust, security, privacy) and align with evolving agent standards
• Transition successful prototypes into production with accountable product teams to deliver secure, reliable, and observable customer experiences
• Share findings and guidance across the engineering community to build confidence in agentic technology
• Champion responsible AI, with customer trust, data protection and transparency prioritized

• Senior engineer with proven leadership across multi-discipline teams and full delivery lifecycle of large-scale distributed software systems
• Hands-on .NET (C#) backend experience including REST APIs and microservices, with ability to learn new languages quickly
• Experience across front-end technologies and ability to guide teams owning them
• Strong background in microservices, distributed systems, event-driven and asynchronous design
• Hands-on AI experience (large language models or agents) or strong appetite to learn in a commerce setting
• Proven prototyping speed, then hardening for production
• Experience working with external partners and explaining complex ideas to senior stakeholders
• Enterprise-scale systems experience (high traffic, high availability) with focus on scalability, performance, resilience, cost
• Strong architecture skills with ability to defend decisions and manage technical debt
• Knowledge of sync/async patterns for enterprise data integration
• Experience with Agile/XP practices and full SDLC (CI/CD, monitoring, telemetry)
• Familiarity with secure coding, authentication, data protection and API security
• Cloud-native systems design, ideally on Microsoft Azure

• collaboration
• communication with stakeholders
• mentoring and coaching engineers
• .NET (C#) backend
• REST APIs
• microservices