Founding Product Engineer

Formula.; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Formula. is seeking a founding TypeScript Engineer to own features end-to-end in a London office setting. You’ll partner with the VP Engineering on core product development, shipping frontend and backend capabilities in a TS stack, and embedding AI at the heart of the solution.

You will lead agentic workflows, API/data-model design, and complex enterprise integrations while shaping product direction in a fast-paced, startup environment.

Qualifications

• 5+ years of software engineering experience, ideally building SaaS products.
• Strong TypeScript, which is non-negotiable.
• Track record shipping end-to-end products across frontend and backend.
• Hands-on experience with agentic engineering.
• Startup or early-stage experience.
• Experience integrating with enterprise systems.

Responsibilities

• Build and ship frontend and backend product features across a TypeScript stack.
• Develop APIs, data models and integrations into complex enterprise systems.
• Build agentic workflows, including prompting and tool use.
• Turn ambiguous problems into simple, working solutions and fix issues without waiting to be asked
• Own your work from design through to production, using AI heavily in how you build

Skills

TypeScript

SaaS product development

Full stack shipping

Agentic engineering

Startup / early-stage

Enterprise integrations

Ambiguity handling

Job description

We're working with an early-stage, AI-native SaaS company building intelligent agents for some of the world's largest enterprises, operating in a huge industry that AI has barely touched. Global organisations are already customers, the team is small and high-performing, and they move quickly.

This is a Founding TypeScript Engineer role for someone who wants very high ownership. You'll work directly with the VP Engineering on the core product, owning features end to end: understanding the problem, deciding how to solve it, shipping it and making sure it works. AI sits at the centre of the product.

Responsibilities

• Build and ship frontend and backend product features across a TypeScript stack
• Develop APIs, data models and integrations into complex enterprise systems
• Build agentic workflows, including prompting and tool use
• Turn ambiguous problems into simple, working solutions and fix issues without waiting to be asked
• Own your work from design through to production, using AI heavily in how you build

Key Requirements

• 5+ years' software engineering experience, ideally building SaaS products
• Strong TypeScript, which is non-negotiable
• A track record of shipping products end to end, across frontend and backend
• Hands‑on experience with agentic engineering
• High agency, sharp attention to detail and strong product judgement
• Startup or early-stage experience
• Experience integrating with enterprise systems
• Comfort working in ambiguity and shaping product direction

Details

• Office-first, 3/4 days per week in central London
• Founding seat
• High ownership and direct influence over product and technical decisions
• AI at the heart of the product and engineering environment

A strong opportunity for a Founding TypeScript Engineer who wants full end-to-end ownership, real influence over product and technical decisions, and the opportunity to build at an early-stage AI company.

Due to the high volume of applications, not all applicants will receive feedback.