Founding Engineer - WarrenAI

Story Terrace Inc.; City Of London; On-site; GBP 80,000 - 100,000; Full time

Job summary

A pioneering fintech startup in London is seeking a driven individual to build AI features for financial coaching. This role focuses on optimizing AI capabilities and working with modern technologies like Python and Next.js. You will have the chance to shape the future of AI finance while receiving a meaningful equity stake and the autonomy to innovate in a dynamic environment.

Benefits

Equity stake

Autonomy in product building

Support from industry experts

Qualifications

• Experience building AI features in production environments.
• Familiarity with backend LLM tooling and prompt engineering.
• Passion for optimizing consumer AI products.

Responsibilities

• Build, optimise, and connect our ecosystem of AI features.
• Prototype new capabilities quickly and measure their impact.
• Work across Python and lightweight frontends to implement features.

Skills

AI feature building

Python

Next.js

Agile methodologies

Tools

FastAPI

Vercel AI SDK

AWS

Job description

📍 London | 🌱 Pre-Seed | 💸 Equity + Salary | 🧠 AI x Fintech

👋 About Warren AI

Warren AI is your personal AI financial coach — making expert financial planning accessible to everyone, not just the wealthy few. Forget £2,000-a-year human advisors with clipboards or the endless DIY rabbit hole online. With Warren, you have honest, human‑like conversations about your money — and get personalized, step‑by‑step plans to achieve your financial goals, plus instant projections for life’s big decisions.

This isn’t another chatbot. It’s a trusted partner that cuts through jargon and gives you the clarity that normally costs thousands — now available 24/7, for a fraction of the price. Check it out here: https://meetwarren.co.uk/

💡 Why This Matters

Only 1 in 10 people ever use a financial advisor. That leaves millions of successful professionals stressed, stuck, and financially under‑optimized. The result? A generation that earns well but feels behind.

We believe that’s unacceptable — and solvable. By using AI to deliver personalized, judgment‑free coaching at scale, we’re democratizing financial clarity and confidence. If we succeed, we’ll fundamentally change how an entire generation builds wealth.

🚀 Why Now

Breakthroughs in AI and changing market dynamics have created a once‑in‑a‑decade opportunity. People are turning to generic chatbots for financial advice — even though those tools were never built for such a high‑stakes, deeply personal domain. The gap between what people need and what’s available has never been wider. And we’re here to bridge it.

🛠️ The Role

We’re looking for someone who loves building with AI and had the experience to do it well. What matters is that you care deeply about what we’re building, and you’re excited to shape the future of AI‑powered finance from the ground up.

Maybe you’ve shipped production LLM features before. Maybe you’ve been tinkering with agents on weekends. Maybe you’re early in your career but fearless about jumping into the deep end. If you’re mission‑driven, curious, and biased to ship — we want to talk.

Responsibilities

(This will evolve based on your skills, interests, and what the product needs next.)

• Build, optimise, and connect our ecosystem of AI features — from RAG pipelines to agents to evaluation tooling.
• Prototype new capabilities fast → measure impact → iterate.
• Work across Python and lightweight frontends (Next.js) to bring complex backends to life.
• Explore ways to make AI advice more contextual, more personalised, and more human.
• Help shape product direction and engineering culture from day zero.

🧠 What We’re Excited By

You don’t need to tick every box. But here’s what will help you thrive:

• Comfortable working with modern backend LLM tooling: APIs, agents, prompt engineering, context management, evals.
• Passionate about building and optimising agentic, LLM‑first products.
• Bonus: experience with voice AI or multimodal interfaces.
• A strong bias to ship fast and learn from users.
• Excited by the challenge of B2C: big reach, messy data, rapid iteration.

🧰 Our Stack (So Far)

FastAPI · Python (AI) · LiveKit · Next.js + TypeScript · Vercel AI SDK · AWS

🌱 What’s In It for You

• A meaningful equity stake as part of the founding team
• Freedom to build and scale the product your way — with massive autonomy.
• Hands‑on support from the Founders Factory network (for life).
• Access to Aviva’s expertise and industry reach.
• A once‑in‑a‑generation opportunity to define how AI powers the next wave of wealth‑building.