Software Engineer (£80k + Equity) at Seed-stage AI startup backed by leading institutions

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 Jack's network.

The next step is to speak to Jack.

Job Title

Software Engineer

Salary

£80k + Meaningful EMI Equity

Company Description

Seed-stage AI startup backed by leading institutions building tax advisory automation

Job Description

You will be a founding-level engineer building the future of tax advisory. Working directly with founders, you will own the development of transparent, AI-native systems that transform manual workflows into structured, traceable deliverables. This role involves everything from prototyping agentic systems to hardening production services for major enterprise firms.

Location

London, UK

Why this role is remarkable

Work at the frontier of agentic AI by building production-grade multi-agent systems with LangGraph and Neo4j for high-stakes regulated domains. Join a high-velocity, technical founding team backed by top-tier institutional investors and industry-leading angels with immediate market traction. High-ownership environment where you define the engineering culture, influence product strategy, and ship features directly to major enterprise customers.

What You Will Do

Build and scale LangGraph-based multi-agent systems featuring advanced checkpointing, observability, and retrieval-augmented generation pipelines. Design and implement robust Python APIs using FastAPI and optimize complex data schemas across PostgreSQL, Supabase, and Neo4j graph databases. Architect enterprise-ready infrastructure on GCP, implementing sophisticated IAM, multi-tenant isolation, and audit patterns required for regulated procurement.

The ideal candidate

2–3 years of experience building production software, including at least one year within a fast-paced startup environment. Deep technical proficiency in the modern AI stack, specifically LangGraph, RAG pipelines, vector databases, and AI coding tools like Cursor. Strong engineering fundamentals in Python/FastAPI and cloud operations on GCP or AWS, with a mindset focused on reliability and outcomes.

Who are Jack & Jill?

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.

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.

Next steps

Step 1. Visit the job listing.

Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/software-engineer-80k-equity-at-seed-stage-ai-startup-backed-by-leading-institut-f9c16e6b-ce5d-4b14-96ce-3d1297be7dae?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_f9c16e6b-ce5d-4b14-96ce-3d1297be7dae

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 you're 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 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.