The promise of artificial intelligence is no longer locked away in closed systems. The future belongs to builders who create models that reflect their own data, values, and vision.
We envision a future built on specialized AI that you own and control. A future powered by Small Language Models (SLMs) that are forged from your data, aligned with your values, and run on your terms. The gap that exists to get there isn't a frontier problem. It's a tooling problem.
At round3, we build the tools for self-owned AI. We create the secure, observable, developer-first stack that makes owning your models not just possible, but practical.
Discover our products at
three.dev
Join us
We're an experienced, product-minded team building critical AI infrastructure. If the future of AI platforms excites you, we'd love to talk.
Founding Engineer, Frontend
Frontend architecture and component systems.
- Take ownership of designing and evolving our frontend architecture and component systems, setting the technical direction for the user interface.
- Build and deliver high-performance, visually stunning UIs, working closely with product, UX, and infrastructure teams to ensure secure, observable, and delightful user experiences.
- Explore and prototype cutting-edge browser-based LLM inference using WebGPU and emerging web technologies, pushing the boundaries of what's possible in the browser.
- Contribute to product strategy and roadmap discussions, bringing a frontend perspective to cross-functional planning.
Founding Engineer, ML Systems
Training, evals, and productionization of SLMs.
- Own evaluations and training pipelines for small language models (SLMs), from data curation to deployment.
- Run and automate benchmarks like SWE-Bench, MMLU, IFEval, and others to measure model performance and guide improvements.
- Design and implement scalable, reproducible training and evaluation workflows using modern ML tooling (e.g., PyTorch, JAX, Weights & Biases, Ray, HuggingFace).
- Investigate and implement techniques for efficient fine-tuning, distillation, and continual learning.
- Stay up to date with the latest research in LLM/SLM evaluation, safety, and alignment, and bring best practices into our stack.
- Contribute to product strategy and roadmap discussions, bringing a ML perspective to cross-functional planning.
Founding Engineer, Backend
Backend architecture and systems.
- Architect and implement the core backend systems that power our platform.
- Design and build scalable, secure, and highly reliable services to support rapid product growth.
- Collaborate closely with product, frontend, and ML teams to deliver seamless, high-quality user experiences.
- Participate in the oncall rotation to ensure the reliability and uptime of backend services.
- Contribute to product strategy and roadmap discussions, bringing a backend perspective to cross-functional planning.
Don't see the right role? Reach out anyway.