AI Training Infrastructure Engineer - Post Training

Company: OptiRoi Media
Location: San Francisco
Posted on: May 21, 2025

Job Description:

Perplexity is seeking experienced AI Research Engineers and Scientists to continue to improve our in-house Online LLMs, the Sonar models. Your job is to work with the team and create a robust and effective training framework (on top of Megatron/PyTorch), especially for post-training LLMs.Responsibilities

• Build a post-training framework that can run cutting-edge model training jobs at scale.
• Implement the necessary infrastructure and components to support the latest models and algorithms like SFT, RL (DPO/GRPO), and more.
• Own the full stack data, training, and evaluation pipelines required to post-train LLM models.
• Work closely with engineering teams to integrate Sonar models into our product.Qualifications
  • Proven experience with large-scale LLM frameworks building.
  • Strong in Python/PyTorch; C++/CUDA is a plus.
  • Self-starter with a willingness to take ownership of tasks.
  • Passion for tackling challenging problems.
  • Minimum of 6 years of working on relevant projects.Bonus
    • PhD in AI/ML/Systems or related areas.
    • Experience building LLM training frameworks, especially post-training.The cash compensation range for this role is $220,000 - $290,000.At Perplexity, we've experienced tremendous growth and adoption since publicly launching the world's first fully functional conversational answer engine in 2022. We've grown from answering 2.5 million questions per day at the start of 2024 to around 20 million daily queries in December 2024.Final offer amounts are determined by multiple factors, including experience and expertise, and may vary from the amounts listed above.Equity: In addition to the base salary, equity is part of the total compensation package.Benefits: Comprehensive health, dental, and vision insurance for you and your dependents. Includes a 401(k) plan.Apply for this job* indicates a required fieldFirst Name *Last Name *Email *Phone *Resume/CV *WebsiteLinkedIn ProfileWill you now or in the future require visa sponsorship for employment? * Select...Are you open to a hybrid work schedule (In office M-W-F) * Select...Are you located in the San Francisco Bay? * Select...If you do not live in the San Francisco Bay Area, are you willing to relocate? Select...
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Keywords: OptiRoi Media, Arden-Arcade , AI Training Infrastructure Engineer - Post Training, Engineering , San Francisco, California