Principal Software Engineer
Harnham
New York · Posted November 6, 2026
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Engineering jobs in the rankings
Rankings about engineering jobs
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- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
Pay compared with the market
This listing does not state pay. Across 109 open principal software engineer listings that state pay, the middle half runs $210,500 to $320,000 and the median is $275,000.
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Among software developers, AI is already used for some of the tasks. Measured exposure for software developers: 29% (some).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
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About the job
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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.
To Apply for this Job Click Here