Principal Software Engineer (AI)

Location: London, England, United Kingdom; hybrid workplace

Company

hirify.global is a fashion and technology product company building a platform used by millions of customers, with a focus on inclusive and responsible innovation.

What you will do

• Lead rapid proofs of concept for AI agents that discover, recommend, and buy fashion through hirify.global.
• Shape agent-ready APIs, product and catalogue data, identity, payments, trust, security, privacy, and alignment with emerging agent standards.
• Take successful prototypes into secure, reliable, observable production experiences with owning engineering teams.
• Own and evolve front-end and microservice architecture, including API design, contracts, integration patterns, and service boundaries.
• Guide teams through complex engineering challenges, improve development practices and tooling, and champion performance, reliability, security, accessibility, testing, and observability.
• Mentor engineers across the stack and collaborate with technology partners, AI platform providers, industry groups, and senior stakeholders.

Requirements

• Highly experienced senior engineer with a proven record guiding multidisciplinary teams through the full delivery lifecycle of complex, large-scale, distributed software systems.
• Deep hands-on experience building back-end systems in .NET and C#, including REST APIs and microservices, with the ability to learn new languages and tools quickly.
• Ability to read, review, contribute to, and guide teams working across front-end technologies for web and apps.
• Strong experience with microservices and distributed systems, including event-driven and asynchronous designs, service boundaries, resilience, and production operation.
• Hands-on AI experience, such as large language models or agents, or a strong appetite to learn quickly and apply AI in commerce.
• Track record of rapid prototyping followed by production hardening, plus experience working with external partners, industry groups, and senior stakeholders.
• Enterprise-scale experience with high-traffic, high-availability platforms serving millions of users, including scalability, performance, resilience, and cost management.
• Excellent architecture skills, including designing and evolving complex systems, defending decisions, and managing technical debt and dependencies.
• Experience with Agile and XP practices; software development lifecycle, QA, CI/CD, progressive releases, monitoring, telemetry, unit testing, TDD, BDD, integration testing, performance testing, application security, and cloud-native systems, ideally Microsoft Azure.

Culture & Benefits

• Inclusive workplace that supports authenticity, diversity, equity, and inclusion.
• Employee discount and access to employee sample sales.
• 25 days of paid annual leave plus an additional celebration day.
• Discretionary bonus scheme and private medical care scheme.
• Flexible benefits allowance, which can be taken as cash or used for other benefits.
• Personalised learning and in-the-moment development opportunities.