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Principal AI Architect

Hop · San Francisco, CA · Hybrid

Weak hiring record · median 194 days open

2222

Hiring signal

Ghost risk

Open 194 days · How we score

All reasons
  • Open 194 days
  • 100% of this employer's openings are over 60 days old

In its favour

  • Still listed on the employer's own board

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Principal AI Architect at Hop. We’ll keep it in your applied jobs, so you can see it later and be warned before applying to the same employer twice.

Draup is a Series A-funded agentic AI company building the intelligence layer for how global enterprises make workforce and go-to-market decisions. We work with 250+ enterprise clients — including 5 of the Fortune 10 — processing 1B+ job descriptions, 850M+ professional profiles, and signals from 100+ labor databases.

We are now building our Silicon Valley engineering team — a small, senior group focused on next-generation AI research and product.

Location

San Francisco, SoMa — minimum 4 days per week in-office.

What you'll do

  • Define and own the architectural vision for next-generation

AI systems

novel agent architectures, reasoning systems, and proprietary model development.

  • Prototype and evaluate breakthrough AI capabilities — predictive modeling, autonomous signal synthesis, multi-modal intelligence — that create defensible IP.

Set the technical foundations

data architecture, model serving, agent orchestration, and inference infrastructure for a multi-year product horizon.

  • Evaluate and adopt emerging AI paradigms (multi-agent reasoning, RLHF, retrieval-augmented fine-tuning) before they are mainstream.
  • Establish engineering standards, architecture review processes, and IP documentation practices for the team.

What we require

  • BS/MS/PhD in Computer Science, AI/ML, or related field. PhD or equivalent research depth preferred.
  • 5+ years in AI/ML engineering with at least 2 years in a principal engineer or lead architect role.
  • Demonstrated history of building original AI systems that became products — not implementations of existing patterns.

Deep expertise across

LLM training and fine-tuning, agentic system design, knowledge graph construction, large-scale data modeling.

Comfort operating in greenfield conditions

high ambiguity, high ownership.

  • Patents, published research, or shipped products with clear proprietary differentiation are strong signals.
  • No visa sponsorship. Must be authorized to work in the US without current or future employer sponsorship.

Skills

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