# Founding Engineer

**Company:** [Momentic](https://hotfix.jobs/companies/momentic)
**Location:** San Francisco, CA
**Role:** ML Engineering
**Salary:** $150k – $220k/yr
**Experience:** 3+ years
**Skills:** Python, TypeScript, llm performance tuning, Prompt Engineering, context management, llm evaluation, llm observability, supervised fine-tuning, reinforcement learning fine-tuning, React, Next.js, Node.js, Postgres, GCP, Kubernetes
**Posted:** 2026-08-10

> 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.

## Job Description

## 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.

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**Apply:** https://hotfix.jobs/jobs/2429461f-46f1-49aa-a372-7ef96e3ce2e1
**Canonical:** https://hotfix.jobs/jobs/2429461f-46f1-49aa-a372-7ef96e3ce2e1