Founding Software Engineer (£100k-£140k + Equity) at Well-funded AI voice agent startup

Jack & Jill/External ATS; Greater London; On-site; GBP 100,000 - 140,000; Full time

Job summary

An innovative tech startup in London is seeking a Founding Software Engineer to shape the future of AI voice technology. This role involves building core product features across the full stack and influencing the product lifecycle. Ideal candidates will have over 5 years of experience in production environments, focusing on AI products. This position offers a competitive salary up to £140k and significant equity opportunities in a fast-paced, high-impact environment.

Benefits

Significant equity opportunity

Fast-paced working environment

Backed by top-tier VCs

Qualifications

• 5+ years of production experience with React, TypeScript, and Python.
• Proven track record of building and shipping AI products end-to-end.
• Strong fundamentals in software engineering.

Responsibilities

• Build and ship core AI voice agent product features across the full stack.
• Own the product lifecycle from customer needs to solution delivery.
• Apply best practices in testing, documentation, and reliability.

Skills

React

TypeScript

Python

Customer-oriented mindset

Proactive attitude

Job description

This is a job that Jill is helping to recruit for on behalf of one of our customers. To apply, speak to Jack.

Title

Founding Software Engineer (£100k-£140k + Equity) at Well-funded AI voice agent startup

Job Title

Founding Software Engineer

Salary

£100k-£140k + Equity

Company Description

Well-funded AI voice agent startup

Job Description

Join a well-funded AI voice agent startup as a Founding Software Engineer. You will build and ship core product features, shaping the future of AI voice technology. This role involves working across the full stack, solving complex challenges, and directly impacting customer success. Ideal for those passionate about 0-to-1 building and cutting‑edge AI.

Location

London, UK

Why this role is remarkable

• Shape the future of AI voice technology from the ground up.
• Backed by top‑tier VCs, strong customer traction in a growing market.
• Significant equity opportunity in a fast‑paced, high‑impact environment.

What you will do

• Build and ship core AI voice agent product features across the full stack.
• Own the product lifecycle from customer needs to solution delivery and iteration.
• Apply best practices in testing, documentation, and reliability to raise the bar.

The ideal candidate

• Strong fundamentals and 5+ years production experience with React, TypeScript, Python.
• Proven track record building and shipping AI products end‑to‑end.
• Customer‑obsessed, biased for action, with an owner's mindset for 0‑to‑1 building.

How to Apply

To apply for this job speak to Jack, our AI recruiter.

1. Step 1. Visit our website.
2. Step 2. Click 'Speak with Jack'.
3. Step 3. Login with your LinkedIn profile.
4. Step 4. Talk to Jack for 20 minutes so he can understand your experience and ambitions.
5. Step 5. If the hiring manager would like to meet you, Jack will make the introduction.