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MomenticMomenticSan Francisco, CA

Founding Engineer

Build and ship AI-native quality platform features, integrating and evaluating LLMs in real-world applications. The role requires strong software engineering fundamentals, 3+ years of experience, and hands-on expertise in prompt engineering, LLM observability, fine-tuning, and evaluation systems.

150k – 220k/yr
On-site3+ YOEML Engineering

About the role

Responsibilities

  • Solve difficult problems with product and technical ambiguity.
  • Build, ship, and take ownership of product functionality across the stack.
  • Integrate and apply large language models in real-world applications.
  • Work autonomously, manage project details, and deliver efficiently.

Requirements

  • Experience with LLM performance tuning, including prompt engineering and context management strategies.
  • Experience with LLM evaluations and observability.
  • Experience integrating LLMs into real-world applications using modern technologies such as Python and TypeScript.
  • Familiarity with supervised fine-tuning (SFT) and/or reinforcement learning fine-tuning (RLFT) on platforms such as Fireworks, Together AI, or Baseten.
  • Familiarity with evaluation dataset engineering, prompt engineering, LLM-as-a-judge verifiers, and reinforcement learning environments.
  • 3+ years of experience.
  • Must be located in San Francisco or willing to relocate and work in person.

Nice-to-haves

  • Experience with supervised or reinforced fine-tuning.
  • Experience with classical machine learning techniques such as template matching, bounding box detection, and optical character recognition (OCR).
  • Experience running statistical experiments.

Technology Stack

  • React
  • TypeScript
  • Next.js
  • Node.js
  • PostgreSQL
  • Google Cloud
  • Kubernetes

Compensation and Benefits

  • Annual salary: $150,000–$220,000.
  • Competitive medical, vision, and dental insurance.
  • 401(k).
  • Unlimited paid time off.
  • Company offsites and events.
  • Fully stocked kitchen.

Visa Sponsorship

  • Sponsorship available for TN, E-3, or J-1 visas.
  • H-1B visa and Green Card sponsorship or transfer are not currently available.

Skills

PythonTypeScriptllm performance tuningPrompt Engineeringcontext managementllm evaluationllm observabilitysupervised fine-tuningreinforcement learning fine-tuningReactNext.jsNode.jsPostgresGCPKubernetes

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