Senior Data Scientist

Zefr, Inc.

Job Overview

Location

Marina del Rey, CA

Job Type

Full-time

Full Job Description

📋 Description

• Senior Data Scientist focused on research and productionalization of Large Language Models for multimodal social media content understanding at Zefr, Inc., a global leader in brand suitability targeting and measurement.
• Fine-tune, optimize, and deploy LLMs to understand hundreds of millions of videos, images, and text posts from TikTok, YouTube, Facebook, Instagram, and Snap; build compound AI systems combining multiple models and modalities into scalable pipelines.
• Work within Zefr’s technology team leveraging patented machine learning and AI (Cognition AI) to power responsible marketing by enabling advertisers to control content adjacencies based on brand safety and suitability preferences aligned with GARM standards.
• Advance expertise in LLM lifecycle management — from prototyping to production-grade serving at scale — while contributing to cutting-edge AI systems that balance quality, latency, and cost in multimodal social media understanding.

🎯 Requirements

• Bachelor's or Master's degree in Computer Science or related field with 4+ years of professional experience in machine learning or data science
• Hands-on experience fine-tuning large language models (open-source and/or closed-source)
• Experience with LLM inference optimization — KV cache management, quantization, multi-node GPU serving, batching strategies, and serving frameworks (vLLM, TensorRT LLM, SGLang)
• Track record of taking ML models from research to production at scale
• Fluency with Python and SQL (specifically Snowflake)
• Experience working with multimodal models and features

🏖️ Benefits

• Flexible PTO
• Medical, dental, and vision insurance with FSA options
• Company-paid life insurance
• Paid parental leave
• 401(k) with company match
• Professional development opportunities
• 13 paid holidays off
• In-office, hybrid, and fully-remote work options available
• Summer Fridays (shorter work days on select Fridays during summertime)
• In-office lunches and lots of free food
• Optional in-person and virtual events

Skills & Technologies

Python

Node.js

FastAPI

AWS

GCP

Data Science

Senior

Remote

Degree Required

Ready to Apply?

Apply Externally

You will be redirected to an external site to apply.

Zefr, Inc.

Visit Website

About Zefr, Inc.

Zefr provides brand suitability and contextual targeting technology for advertisers on YouTube, TikTok, Facebook and other social video platforms. Its machine-learning systems scan and classify millions of videos daily, mapping content against GARM and brand-specific safety standards to ensure ads appear only alongside appropriate material. The company delivers dashboards, verification reporting and programmatic integrations that help marketers maximize reach while minimizing reputational risk. Founded in 2009 and headquartered in Los Angeles, Zefr works with global agencies and Fortune 500 brands to align campaigns with brand values and regulatory requirements.

View Company Profile

Get more remote jobs like this

Subscribe to the weekly newsletter for similar remote roles and curated hiring updates.

Weekly remote jobs and featured talent.

No spam. Only curated remote roles and product updates. You can unsubscribe anytime.