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Arctal

Arctal

Job listing

London, United Kingdom£80-120k + 0.75-1% Equity

Data Infrastructure Engineer at Stealth AI data startup founded by Cambridge ML researchers

Join a lean, high-output team of five in Old Street that’s outperforming 50-person departments by building the world's most advanced AI-driven financial datasets. Founded by the experts behind Secondmind and Sylvera, this startup is replacing legacy financial data sources with autonomous AI agents. As the Data Infrastructure lead, you'll own the entire pipeline turning 100,000+ unstructured documents into real-time insights for global asset managers. If you're an ambitious engineer with 3-5 years of experience looking for a CTO trajectory and a chance to define the future of agentic data infrastructure, this is your next move.

Overview

Role overview

You will own the end-to-end data function for a high-output team of five that outperforms departments ten times its size. By building sophisticated infrastructure to turn 100k+ unstructured financial documents into high-fidelity datasets, you will directly enable the world's largest asset managers and investment banks to make million-dollar decisions.

Company

Arctal

Arctal

Finance1-10 employees

Stealth AI data startup founded by Cambridge ML researchers and serial founders (Secondmind, Sylvera)

Responsibilities

What you will do

  • Architect and maintain robust data pipelines for the ingestion, transformation, and distribution of massive unstructured datasets from PDFs.
  • Collaborate with and build new autonomous AI agents (like LISA and DAN) to automate complex document parsing and validation.
  • Ensure absolute data integrity and quality for institutional clients, owning the infrastructure that keeps datasets current and correct 24/7.

Candidate profile

Who this is a fit for

  • 3–5 years of experience building production data pipelines or ML systems using Python, Postgres, and asynchronous task managers.
  • A product-first mindset with an obsession for data quality and experience shipping in fast-paced startup environments of 2–30 people.
  • Deep familiarity with agentic tooling and LLMs, using Claude Code or Codex daily as a primary part of your development workflow.

What makes it remarkable

Why this role is remarkable

  • Founding-level impact in a lean team where five people produce the output of fifty through advanced AI agent orchestration.
  • Direct exposure to leadership from Cambridge ML research and successful exits, working at the intersection of finance and agentic AI.
  • Clear trajectory to a CTO path or a world-class education in building production-grade data systems for the next era of financial services.

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