Jack & Jill
Full Stack Engineer (+ Equity) at cto.new
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Job Title
Full Stack Engineer
Salary
Not Disclosed
Company Description
cto.new is a $4.7M Seed-stage startup backed by Kindred Ventures, PROfounders Capital, and EF that has scaled from $0 to $1.5M ARR in just 60 days. They are building a revolutionary platform that uses autonomous agents and LLMs to transform business ideas into production-ready, full-stack software.
Job Description
You will build the core infrastructure for an AI-native platform, focusing on LLM orchestration, token caching, and multi-agent systems. Leaning towards the backend, you'll use TypeScript to ship end-to-end features that generate reliable code at scale. This is a high-ownership role where you'll define the architectural future of autonomous software creation.
Location
London, UK
Why this role is remarkable
- Join a high-traction startup that reached $1.5M ARR in its first 60 days, backed by top-tier investors like Kindred Ventures and EF.
- Work at the technical frontier of AI, solving complex challenges in context engineering, streaming conversations, and autonomous agent orchestration.
- Take on real ownership in a fast-paced, hybrid environment where every engineer directly influences the platform’s architectural direction and user experience.
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What You Will Do
- Develop and scale core product infrastructure including APIs, data pipelines, and sophisticated LLM orchestration layers using TypeScript.
- Collaborate directly with users to understand business requirements and translate them into autonomous code generation features and agent behaviors.
- Design and implement robust services that ensure AI-generated software remains production-ready, iterable, and reliable at significant scale.
The ideal candidate
- Possesses deep TypeScript expertise and strong backend instincts, with experience building and scaling LLM-powered products or complex infrastructure.
- Has 1-2 years of experience at a high-growth startup or demonstrates exceptional engineering depth through standout academic credentials and technical projects.
- Thrives in ambiguous, fast-paced environments and is passionate about shipping high-quality code that defines the future of software creation.
Who are Jack & Jill?
- 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.
- 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.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
How does this work?
- Jack is 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 it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
We never post fake jobs
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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