Founding Engineer (100k + Equity) at Spinal

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Job Title: Founding Engineer (100k Equity) at Spinal - Post-seed AI infrastructure startup

Salary: 100k Equity

Company Description: Spinal - Post-seed AI infrastructure startup

Job Description:
Join Spinal as a Founding Engineer to build the system of record for AI cost intelligence. You will design the core billing engine and data pipelines that process millions of real-time events for enterprises. This is a true 0-to-1 role where you will own the technical architecture alongside the CTO to solve AIs biggest spend visibility problem.

Location: London UK

Why this role is remarkable:

• Lead the architectural design of a foundational infrastructure layer for the rapidly growing AI economy moving from initial concept to enterprise-scale production.

• Join a high-velocity post-seed startup with strong runway early enterprise traction and a founding team with deep expertise in infrastructure and AI systems.

• Receive meaningful equity (0.51.5%) and a clear path to a salary increase to 120k following the next funding round anticipated within 12 months.

What you will do:

• Ship a production-grade billing engine and scalable data infrastructure handling millions of real-time events within your first 90 days.

• Architect and maintain a high-performance backend stack using Python FastAPI PostgreSQL and ClickHouse deployed on GCP.

• Define the engineering culture and practices including API design and distributed systems strategy that will serve as the foundation for all future hires.

The ideal candidate:

• Proven experience building products from 01 ideally having previously co-founded a startup or served as an early-stage lead engineer.

• Expert-level proficiency in Python and FastAPI with a strong background in academic engineering and complex backend systems like ClickHouse.

• A systems-thinker who is comfortable with the ambiguity of early-stage growth and resides in London to collaborate in-person 4 days a week.

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:

IC