Senior Machine Learning Engineer (AI/LLM)

TL;DR

Senior Machine Learning Engineer (AI/LLM): Designing and building large-scale AI systems for platform safety by leveraging multimodal LLMs to curate data and mitigate risks. Focus on architecting continuous learning pipelines, fine-tuning foundation models, and integrating AI solutions for real-time moderation.

Location: This is a hybrid role based in San Mateo, CA, United States, requiring onsite presence Tuesday, Wednesday, and Thursday.

Salary: $242,100–$293,800 USD

Company

hirify.global is a product company focused on connecting people in 3D immersive digital experiences, empowering a global community of developers and creators.

What you will do

• Design, build, and own core components of Safety AI Systems for data generation, labeling, and evaluation, focusing on reliability and scalability.
• Fine-tune open-weight multimodal LLMs (text, image, video, voice) and deploy them as agents for synthetic datasets and high-quality automated labeling.
• Build robust pipelines for curating and evaluating multimodal training data, including human-in-the-loop systems.
• Develop benchmarks and evaluation frameworks to measure multimodal model behavior, data quality, and downstream safety impact.
• Architect systems that support continuous learning, enabling weekly gated rollouts and tight feedback loops from real-world failures.
• Partner closely with engineers, product managers, policy experts, and safety specialists to translate complex safety challenges into scalable, production-grade AI solutions.

Requirements

• 5+ years of experience designing, building, and deploying large-scale machine learning systems in production environments.
• Graduate degree or equivalent experience in Computer Science, Engineering, or a related technical field.
• Strong communication skills and a collaborative, solution-oriented approach to problem solving.
• Hands-on experience with fine-tuning VLMs, LLMs, or large multimodal models to improve model quality, safety, and performance.

Nice to have

• Experience working with data quality, evaluation, synthetic data, or ML infrastructure in safety systems.

Culture & Benefits

• Strive to connect a billion people with optimism and civility, with a mission to lead in civil immersive online communities.
• Work to shape the future of human interaction, solving unique technical challenges at scale.
• Foster positive relationships by keeping the platform secure, inclusive, and resilient.
• Collaborative, curious, creative, and impact-driven work environment.
• All full-time employees are eligible for equity compensation and comprehensive benefits.
• hirify.global provides equal employment opportunities and reasonable accommodations to candidates with qualifying disabilities or religious beliefs.