AI Researcher (AI)

TL;DR

AI Researcher (AI): Advancing AI products and capabilities by post-training SOTA LLMs and building robust training frameworks with an accent on model performance across various products. Focus on staying current with the latest LLM research, implementing personalization, and turning research ideas into launched models.

Location: Onsite in San Francisco or Palo Alto, USA, or remote globally for employees outside the U.S.

Salary: $200,000–$300,000

Company

hirify.global is building the future of AI-powered search and agent experiences through its Sonar models, Deep Research Agent, Comet Agent, and Search products.

What you will do

• Post-train SOTA LLMs using techniques like SFT/DPO/GRPO.
• Scale model performance across Sonar, Deep Research, Comet, and Search products.
• Invent in-house improvements and optimizations for SOTA models.
• Own full-stack data, training, and evaluation pipelines for model development.
• Build robust training frameworks on top of Megatron/PyTorch.
• Collaborate with engineering and product teams to integrate models and understand user needs.

Requirements

• Proven experience with large-scale LLMs and Deep Learning systems.
• Strong programming skills in Python/PyTorch.
• Experience with post-training techniques and reinforcement learning.
• Self-starter with a willingness to take ownership of tasks.
• Minimum 2-6 years of experience on relevant projects.

Nice to have

• PhD in Machine Learning, AI, Systems, or related areas.
• Experience in post-training LLMs with SFT/DPO/GRPO.
• C++/CUDA programming skills.
• Experience building LLM training frameworks.
• Academic publications and research impact.
• Experience with agent systems and multi-step reasoning.
• Background in personalization and preference learning.

Culture & Benefits

• Comprehensive benefits program for full-time U.S. employees including equity, health, dental, vision, retirement, fitness, commuter, and dependent care accounts.
• Full-time employees outside the U.S. enjoy a comprehensive benefits program tailored to their region of residence.