As the first technical hire, you will take over the codebase from the technical co-founder to build a scalable, production-grade platform. You'll architect systems that convert user demonstrations into autonomous AI workflows using multi-model orchestration. This is a high-autonomy role for a hands-on builder eager to solve complex AI reliability and infrastructure challenges.
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Principal Engineer at Rivulo
Join an elite team as the first technical hire for a London-based AI startup led by founders with multiple successful exits. This isn't just another wrapper; you'll be building the infrastructure that allows non-technical teams to deploy complex, reliable agent-led workflows. With 2% equity, radical autonomy, and a technical stack moving toward the frontier of multi-model orchestration, this is a career-defining opportunity to shape a company from the ground up while solving deep engineering challenges in LLM reliability and browser automation.
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Location
London, United Kingdom
Compensation
£100k + Equity
Company
Rivulo
Role overview
Software
Rivulo empowers non-technical teams to transition to agent-led work. Teams are under pressure to become more efficient with AI, but they shouldn’t have to become experts to do so. We’re building the bridge: turning how people already work into reliable, agent-powered systems that remove friction rather than add it.
What you will do
- Own the technical evolution of the platform, transitioning the v1 MVP into a robust, high-scale infrastructure capable of handling thousands of concurrent AI workflows.
- Design and implement sophisticated multi-model AI orchestration, coordinating LLMs like GPT-4, Claude, and Gemini to optimize cost and performance for complex tasks.
- Lead the development of smart systems for AI-powered workflow understanding, browser automation, and integrations with enterprise tools like Slack and Google Workspace.
Who this is a fit for
- Proven full-stack expert with deep experience in TypeScript, React, and a willingness to master or evolve a Laravel/PHP backend into a modern Node.js ecosystem.
- Deep technical proficiency in AI engineering, including prompt engineering, context window management, and handling real-time streaming and reliability for LLM APIs.
- Entrepreneurial mindset with the ability to move fast in a 0-to-1 environment, comfortable wearing multiple hats and engaging directly with customers to solve problems.
Why this role is remarkable
- Join as the first engineering hire with 2% equity, working directly alongside experienced founders who have successfully scaled and exited multiple companies.
- Operate with radical transparency and a self-management philosophy where you own the technical roadmap without bureaucratic hurdles or unnecessary sign-offs.
- Build at the frontier of AI, moving beyond simple wrappers to create deep integrations, browser automation, and sophisticated token-management systems for real-world business operations.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Rivulo wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.