Senior Data Scientist
Zefr
full-time
Posted on:
Location Type: Hybrid
Location: Marina del Rey • California • New York • United States
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Salary
💰 $200,000 - $225,000 per year
Job Level
Tech Stack
About the role
- We are hiring a Senior Data Scientist focused on the research and productionalization of Large Language Models for multimodal social media content understanding.
- Work with multi-terabytes of social media platform data from TikTok, YouTube, Facebook, Instagram, and Snap.
- Fine-tune, optimize, and deploy LLMs that understand what hundreds of millions of videos, images, and text posts are about.
- Span the full lifecycle — from research and prototyping to production-grade serving at scale.
- Build sophisticated compound AI systems that combine multiple models and modalities into reliable, scalable pipelines.
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
- Familiarity with cost/quality tradeoff analysis across LLM providers and self-hosted models
- Experience with distributed systems and GPU-accelerated workloads
- Strong foundation in data structures, algorithms, and software design
- Thorough testing and code review standards/practices
- Strong verbal and written communication skills
- Experience working with Autonomous Coding Agents
- Openness to new technologies and creative solutions
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 the summertime)
- In-office lunches and lots of free food
- Optional in-person and virtual events (we like to celebrate!)
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills & Tools
large language modelsmachine learningdata scienceLLM inference optimizationPythonSQLmultimodal modelsdistributed systemsdata structuresalgorithms
Soft Skills
strong verbal communicationstrong written communicationopenness to new technologiescreative solutions
Certifications
Bachelor's degreeMaster's degree