Founding Principal Engineer

About Us: We're a startup attached to an established scale-up specialising in the commercial optimisation of technology spend. We are building a B2B SaaS platform that helps customers better understand and optimise their supplier spend in an ever increasingly technology driven and cost-constrained world.

What makes us different: We have scale-up backing, existing customer relationships, and a set of engaged clients ready to help co-develop and come on the product journey from day one.

The Role: This is a true 0-to-1 founding engineering role. You'll work directly with the founding team to build and ship v1, owning the hands-on delivery across the full stack. You'll contribute to and own key decisions around architecture, technology choices, security, and product direction.

AI-native from day-one, you will have autonomy to define and build the optimum tooling setup.

Is this your next job Read the full description below to find out, and do not hesitate to make an application.

What You'll Be Doing:

• Build and ship v1 end-to-end - frontend, backend, and infrastructure using modern technologies
• Translate product requirements into technical decisions and architecture alongside the founding team
• Establish the engineering foundations - security, tooling, CI/CD, documentation - that the team will scale from
• Deliver AI/LLM-driven product features from the outset
• Product and data security inherently built into the product from day one

What We're Looking For:

• Strong full-stack experience across modern web technologies
• Proven 0-to-1 delivery - has xwzovoh shipped real B2B SaaS product end-to-end
• Hands-on AI/LLM integration experience in production environments
• Comfortable owning architectural decisions and operating with autonomy
• Security-first mindset and multi-tenant data isolation experience
• Tech lead or founding engineer experience is a strong plus

Why Us: A rare opportunity to join a greenfield startup with scale-up backing, an engaged founding team, and real customers ready to build alongside you from day one.