Full Stack Senior Engineer (+ Equity) at High-growth Legal AI startup

This is a job that Jill our AI Recruiter is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jacks network.

The next step is to speak to Jack.

Full Stack Senior Engineer

Company Description: High-growth Legal AI startup

Job Description:
You will join a fast-paced team building a category-defining AI platform for the venture capital industry. This hands-on role involves owning large parts of the stack end-to-end from building RAG pipelines and orchestrating multiple LLMs to designing sophisticated UIs. You will tackle complex document processing challenges and ship production-ready features for global investment firms.

Location: London UK / Remote

Why this role is remarkable:

• High-velocity environment where you will ship production AI software used by leading global investment funds from day one.

• Well-funded startup backed by top-tier VCs offering meaningful equity and the chance to influence deal-making workflows at scale.

• True technical ownership over architecture AI strategy and product direction within a zero-bureaucracy engineering-led culture.

What you will do:

• Design and ship full-stack features using TypeScript and React while maintaining enterprise-grade security for sensitive legal documents.

• Integrate and optimize RAG pipelines and LLM orchestrations using OpenAI Anthropic and Gemini to automate complex document analysis.

• Build scalable backend services and intuitive frontends that handle thousands of real-world investment documents and high-stakes data extraction.

The ideal candidate:

• 5 years of software engineering experience with a deep mastery of TypeScript and modern React patterns.

• Proven track record of shipping LLM-powered applications in production including experience with prompt engineering and evaluation frameworks.

• Product-minded engineer who thrives in early-stage chaos and prioritizes shipping high-quality secure code over consensus.

Who are Jack & Jill

Ok Ill go first. Im Jack an AI that gets to know you on a quick call learning what youre 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.

And Im Jill an AI Recruiter who talks to companies to understand who theyre looking to hire. Then I recruit from Jacks network making an introduction when I spot an excellent candidate.

Next steps

Step 1. Visit our website.
Step 2. Click Talk to Jack.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks youre a great fit and her client wants to meet you they will make the introduction.
Step 6. If not Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isnt a trick. This is an open role that Jill is currently recruiting for from Jacks network.
Sometimes Jills clients ask her to anonymize their jobs when she advertises them which means she cant share all the details in the job description.
We appreciate this can make them look a bit suspect but there isnt 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 were giving his services away for free.

Required Experience:

Senior IC