Senior AI Platform Engineer — Enterprise AI Agents

Harnham; California (MO); On-site; USD 140,000 - 190,000; Full time

Job summary

Harnham partners with a well-funded Series B startup building the next generation of AI-native data infrastructure for Fortune 500 enterprises. You’ll own the intelligence layer of the platform, making architectural decisions around agent design, model selection, and evaluation strategy.

Everything you build ships to customers; this is not a POC or internal tooling. In a high-impact role, you’ll shape RAG pipelines, vector/knowledge representations, and production-grade AI systems at scale,

Qualifications

• 4–6+ years of software engineering with meaningful AI/ML depth.
• Proven experience building and shipping AI agents in production.
• Strong Python skills with RAG, vector databases, and knowledge graphs.
• Experience with LLM APIs, prompt engineering, fine-tuning, and structured outputs in production.
• Familiarity with AWS and Kubernetes for production AI deployment.
• Experience with data platforms such as Databricks, Snowflake, BigQuery, or Spark is a strong bonus.

Responsibilities

• Architect multi-step AI agents end-to-end, covering problem decomposition, context retrieval, error recovery, and output quality.
• Own RAG pipelines, vector and graph-based retrieval systems, and knowledge representations that let agents reason accurately over complex enterprise data.
• Build the AI layer behind the platform's core code generation capability, from prompt design and model selection through to fine-tuning and output validation.
• Make production AI work at scale, balancing latency, throughput, and observability, and knowing when to optimize a model versus restructure a system.
• Think in failure modes and evaluation strategy, not capability demos, and own the improvement loop.

Skills

Python

AI/ML depth

AI agents

Prompt engineering

LLM APIs

Production AI

Cloud deployment

Tools

Databricks

Snowflake

BigQuery

Spark

Kubernetes

Job description

Harnham partners with a well-funded Series B startup building the next generation of AI-native data infrastructure for Fortune 500 enterprises. You’ll own the intelligence layer of the platform, making architectural decisions around agent design, model selection, and evaluation strategy.

Everything you build ships to customers; this is not a POC or internal tooling. In a high-impact role, you’ll shape RAG pipelines, vector/knowledge representations, and production-grade AI systems at scale,