Founding Data Engineer

Job Title: Founding Data Engineer

Salary: up to ~£120k + profit share

Equity: 0.75 - 1%

Location: Old Street (4-5 office days/week)

Company: Data processing AI Agents

Team : ~5

Funding : Pre-seed

About the company

This early stage start-up is processing hundreds of thousands of unstructured financial documents into clean, structured datasets for some of the world's largest financial institutions - producing the output of 50, with a team of 5.

Forecasting £1.5m revenue within their first 12 months, they have an immense potential - not based on hype or inflated valuations, but rather achieving mega productivity through intelligent application of AI agents.

Their mid term goal is ~£50m revenue with a sub-30 person team. What's in it for you?

• Profit share. Cash in your account on regular basis - not a promise of a huge payout IF the company succeeds and sells.

About the role

You'll own data infrastructure end-to-end - ingestion, transformation, storage, delivery.

The current agent system works. Your job is to scale it: more documents, more asset classes, more clients. You'll make architecture decisions, push the boundaries of agentic tooling and ship data as a product to institutional buyers who rely on it for decisions that move millions.

Full ownership from day one, with a genuine progression trajectory for the right person.

This is a predominantly backend/infra DE role. No dashboards, no stakeholder reporting - just the engine that powers everything. You'll be the most senior person in your domain from day one, with no one above you in this function - and a clear path to leadership later down the line.

✅ Must have requirements:

• Roughly 3-6 years experience building performant data pipelines and ML systems in production at a company where data is the core product, not a support function
• Genuinely AI-native experience: Claude Code, Cursor or equivalent as your daily environment - not occasional experiments
• Python, Postgres, async, queues - fluent and battle-tested
• Experience in a small team (2-30 people) where you owned the whole function without a safety net
• Data quality obsessive - inconsistencies bother you until they're fixed, not flagged and forgotten

Bonus points for:

• Experience at a financial data provider (Bloomberg, Refinitiv, Preqin, FactSet etc.) or quant finance
• Experience with LLMs in production / agentic workflow design
• Web scraping and document parsing at scale
• Staff/Principal-level IC ownership at a larger org

VISA sponsorship is available if needed (but you need to be already living in the UK)