Research Engineer/Scientist

NxT Level • Repto San Francisco, PR

1d • Remote

About The Position

Our client is a stealth-stage AI company building frontier models focused on human intent understanding, computer use, and autonomous agent systems. The founding team includes leaders from Tesla AI, Google DeepMind, NVIDIA, Physical Intelligence, and Apple. They are building from the ground up and looking for early research talent to help shape the technical direction, research agenda, and product architecture from day one. This is an opportunity to work on some of the hardest problems in applied AI: teaching agents to understand how people work, represent intent, use computers, and complete long-horizon tasks with increasing autonomy. Our client is hiring a Research Engineer / Scientist to own ambitious research bets end to end. This person will work across hypothesis generation, data strategy, model training, evaluation, deployment, and iteration. The role is focused on reinforcement learning, post-training, continual learning, multimodal agents, and long-horizon autonomous systems. The team is open to a range of backgrounds, from fresh PhD graduates with strong research internships to senior researchers who have led teams at top AI labs.

Requirements

• Experience in frontier AI research, applied AI research, or research engineering
• Strong background in machine learning, deep learning, reinforcement learning, post-training, continual learning, or multimodal systems
• Experience designing and running rigorous experiments
• Ability to move from research idea to implemented system
• Strong programming and engineering fundamentals
• Comfort working with large-scale datasets and complex model training workflows
• Strong judgment around model evaluation, data quality, experimental design, and deployment readiness
• Ability to operate in ambiguity and take ownership of open-ended research problems
• Clear communication and ability to collaborate with a small, high-caliber founding team
• Excitement about computer use, autonomous agents, human intent modeling, and the future of AI-native software

Nice To Haves

• Fresh PhD graduates with strong research internship experience
• Research engineers from frontier AI labs
• Applied scientists with experience training and evaluating advanced AI systems
• Senior researchers who have led teams or major technical efforts
• Builders who can connect research quality with production-minded execution

Responsibilities

• Run experiments and train frontier AI models focused on human judgment scaling, computer use, and intent representation learning
• Post-train LLMs and multimodal agents using reinforcement learning and continual learning methods
• Work with large-scale screen recording and behavioral data to understand how individual users work
• Build models that can learn user workflows and proactively automate tasks
• Design and execute rigorous research experiments that improve autonomous agent capabilities
• Own research bets end to end, from hypothesis and data through training, evaluation, deployment, and measurement
• Help define the company’s research direction as an early technical team member
• Partner closely with founders and engineering leadership on technical architecture and product strategy
• Translate cutting-edge research into systems that can power real product experiences

What This Job Offers

• Job Type: Full-time
• Career Level: Entry Level