---
title: "ML Engineer at Cortex – Sunnyvale, CA · Posted Dec 23"
canonical: "https://www.metaintro.com/job/ml-engineer-at-cortex-c6b143fe-2b0f-557f-a10f-4ed38b20d292"
language: "en"
author: "Metaintro"
---

[![Cortex logo](/api/company-logo?url=https%3A%2F%2Fcortex.io%2Fapple-icon.png%3Fdda06f2a4498ddbb&sig=odnnNfwV_eUwETyPQ6YItLluqmmZlOr3xrhZNR4_CAQ)](/company/cortex)[Cortex](/company/cortex)
# ML Engineer at Cortex

**Location**
: Sunnyvale, California

**Level**
: not_specified

**Posted**
: Dec 23, 2025

## Description

The Cortex team is hiring a Prompt Engineer to design, test, evaluate, improve, and evolve prompts for natural-language understanding and AI assistant applications. The role covers prompt development across text generation, question answering, data classification, and synthetic training data; regression testing; performance and user-feedback analysis; safety and compliance evaluation; and collaboration with legal, product, and data science teams. Candidates need strong Python, database, programming, data-processing, testing, and communication skills, along with a relevant bachelor’s degree or certification.

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