Join a senior team of three at throxy building AI agents that autonomously handle outbound sales and inbound lead qualification. You will own problems end-to-end, developing fullstack systems with TypeScript and Next.js. This is a high-impact role where your code directly generates revenue for Fortune 500 customers and fast-growing startups.
This job is no longer actively hiring. Talk to Jack to find live roles.
Software Engineer Fullstack at throxy
Unlike tools that assist humans, throxy builds AI agents that perform the work itself—from dialing to closing revenue. As one of the first engineers on a senior team of three, you’ll own the entire stack using TypeScript and Next.js to build autonomous SDR systems and intelligence pipelines. With month-over-month growth and Fortune 500 customers already onboard, this is a rare chance to ship foundational code that directly drives revenue and scales an AI-native revenue platform from the ground up in London.
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This role is no longer actively hiring, but Jack can still help you discover similar open roles that fit.
Location
London, United Kingdom
Compensation
£75k-£110k + Equity
Company
throxy
Role overview
Content & Collaboration SoftwareLondon, United KingdomSeed (VC-backed)
Throxy builds vertical-specific AI Sales Agents power outbound sales for companies selling into legacy industries, an AI‑native, fully managed service that delivers qualified meetings.
We’re looking for someone who can help us scale and keep accelerating.
Backed by Base10 Partners, Y Combinator, GoHub Ventures, Circle & Co, Palm Drive Capital.
What you will do
- Build and scale autonomous calling infrastructure and AI inbound SDR systems that convert callbacks directly into scheduled meetings.
- Develop intelligence layers that generate post-call insights and prospecting engines using custom scraping and AI qualification pipelines.
- Architect and iterate on a modern stack featuring TypeScript, React, Next.js, SingleStore, OpenSearch, and Trigger.dev.
Who this is a fit for
- Has 3+ years of professional fullstack experience, preferably with a background at high-calibre companies like Stripe, Revolut, or FAANG.
- Possesses strong computer science fundamentals, a degree from a top-tier university, and a track record of shipping projects end-to-end.
- Demonstrates deep proficiency in TypeScript and React, with a strong interest in building with LLMs, RAG systems, or AI agents.
Why this role is remarkable
- Join a YC S25 company at a post-seed stage with $6.2M in funding and proven month-over-month growth.
- Every AI improvement compounds the service's value, allowing you to build on a massive tailwind rather than racing against one.
- Operate with outsized leverage as an early engineer on a tiny, elite team shipping foundational systems for global enterprise clients.
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 throxy wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.