Research Engineer
Prime Intellect
Research Engineer
Prime Intellect
Open frontier-model stack for enterprise RL
Prime Intellect is building the open superintelligence stack: the infrastructure frontier AI labs build internally, made available to every ambitious AI team.
Our platform, Lab, unifies compute, environments, evaluations, secure sandboxes, high-performance training, and deployment into one full-stack system for post-training at frontier scale - from SFT and RL to tool use, agent workflows, and continuously improving production models. We are building open frontier AI: open-source models trained end to end for long-horizon tasks like autonomous research, and the full-stack platform our own research team uses to build them. The next generation of AI companies, enterprises, and research teams do not just need more GPUs. They need the ability to turn their own workflows, tools, data, and feedback loops into superintelligence they own.
Prime Intellect has raised $150M in total funding from Founders Fund, Radical Ventures, NVIDIA, and exceptional AI, infrastructure, and enterprise operators, including Andrej Karpathy, Dwarkesh Patel, and leaders and founders from Ramp, Perplexity, Harvey, Mercor, Zapier, Datadog, Cognition, OpenAI, Thinking Machines, Together AI, SemiAnalysis, LangChain, Browserbase, Cloudflare, Sierra, Databricks, Airbnb, OpenRouter, Standard Intelligence, Fleet, Core Auto, and more. We are looking for people who want to build at the intersection of frontier research, real infrastructure, and go-to-market for a category that does not fully exist yet.
Take Prime Intellect’s next open models from architecture experiments through full pre-training runs, scaling toward 1–3T parameters. You’ll work across the model and training stack, making research decisions and fixing the systems problems that determine whether a run succeeds.
Build and extend the pre-training code in prime-rl, taking small experiments into full training runs.
Evaluate model architecture changes, including MoE and attention designs, against model quality and training cost.
Profile training jobs and improve end-to-end throughput, working with systems engineers on hardware-aware execution.
Make long runs resilient to failures, with reliable checkpointing and recovery.
Investigate training dynamics and numerical stability, checking that optimizations preserve convergence.
Run controlled ablations to guide larger experiments, keeping the setup and results reproducible.
Work with data and evaluation researchers on training mixtures, including midtraining and long-context experiments.
Hands-on experience training language models, including modifying training code and following the effects through actual runs.
Strong Python skills and experience with PyTorch or a comparable framework, with enough systems understanding to debug distributed training.
A practical understanding of model architectures and optimization, including their effect on convergence.
Ability to design an ablation that answers a research question and explain what its results do and don’t show.
Good judgment about what to investigate yourself and when to bring in a colleague.
Flexible work arrangements, with the option to work remotely or in-person at our offices in San Francisco.
Cash Compensation Range of $150-350k, including equity incentives, aligning your success with the growth and impact of Prime Intellect.
Full medical, dental and vision coverage for employees and dependents.
Flexible PTO.
$200/month health and wellness benefit.
Visa sponsorship and relocation assistance for international candidates.
Professional development budget for courses and conferences.
Quarterly team off-sites, hackathons, conferences and learning opportunities.
Company-covered meals when working from our San Francisco office.
If you're excited about the opportunity to build the foundation for the future of decentralized AI and create a platform that empowers developers and researchers to push the boundaries of what's possible, we'd love to hear from you.
Open frontier-model stack for enterprise RL
Prime Intellect provides an open, end-to-end superintelligence stack for enterprises to train and continually improve their own AI agents. The platform includes scalable compute, large-scale reinforcement learning, environments, sandboxes, evaluations, and deployment tools, and it ships open frontier models to customers. It covers the full lifecycle from training to deployment plus post-training support, enabling agentic training at scale. Its differentiator is the open, end-to-end stack used across thousands of customers with strong backing from top investors, and its goal is to help organizations build and iteratively improve their AI agents using open frontier models.
Explore more opportunities at Prime Intellect