Principal Software Engineer

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/ $22500 - $300000 annum

INFO

Salary

SALARY:

$22500 - $300000

Location

LOCATION

Job Type
JOB TYPE

Permanent

Principal Software Engineer, AI | Remote, US (Northeast preferred, NYC office available) | $225,000 - $300,000 base + bonus + equity

Become the technical lead of an early-stage AI company building a digital twin of entire organisations, with an ambition to model whole industries.

The Company
An independent, early-stage AI company whose platform simulates an organisation's people, processes and systems. The output is an AI value creation roadmap for private equity investors and management teams. The company adopts new models internally within hours of release.

The Role

  • Set the platform's architecture with the CTO, including build-versus-buy calls.
  • Raise the team's agentic engineering capability, deploying coding agents safely within strong engineering discipline.
  • Mentor developers, data scientists and data engineers through code review, design review and pairing.
  • Architect production Python services using LangChain or LangGraph across multiple LLM providers.
  • Design data models and queries in BigQuery and Postgres.
  • Build GCP infrastructure across Cloud Run, Cloud Storage, IAM and GitHub Actions CI/CD.

What We're Looking For

  • 8+ years of software engineering, including time as a tech lead or principal/staff engineer.
  • Hands-on experience running agentic coding on a team, with safeguards that protect production.
  • Production LLM applications in Python with LangChain or LangGraph and multiple providers.
  • GCP, BigQuery and Postgres, and strong security experience.
  • A track record of building and developing a team, and of building infrastructure without dedicated platform or security functions.
  • Nice to have: finance, PE or consulting exposure, plus Langfuse or similar observability tooling.

What's On Offer

  • $275,000 base, $50,000 bonus and equity.
  • Remote, with a preference for the Northeast and access to a NYC office.
  • A clear, openly discussed progression path into senior engineering leadership.
  • Direct partnership with the CTO on technical direction.
  • No Visa Sponsorship

How to Apply
Apply via the link or contact Tom Brammer at Harnham.

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