Software Engineer Fullstack

Job Title

Software Engineer Fullstack

Salary

£75k-£110k + Equity

Company Description

throxy is a YC S25 AI startup that has raised $6.2M to build autonomous revenue pipelines that handle outbound sales end-to-end.

Job Description

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.

Location

London, UK

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.

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.

The ideal candidate

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.