Founding Principal Engineer

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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.

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 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.

#J-18808-Ljbffr”, “datePosted”: “2026-05-20”, “hiringOrganization”: { “@type”: “Organization”, “name”: “CoCoSoft Limited”, “sameAs”: “https://uk.whatjobs.com/pub_api__cpl__436783917__4861?utm_campaign=publisher&utm_medium=api&utm_source=4861&geoID=299” }, “jobLocation”: { “@type”: “Place”, “address”: { “@type”: “PostalAddress”, “addressLocality”: “London” } } }
Company: CoCoSoft Limited
Apply for the Founding Principal Engineer
Location: London
Job Description:

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.

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 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.

#J-18808-Ljbffr…

Posted: May 20th, 2026