Job Description
CoreWeave, the AI Hyperscaler™, acquired Weights & Biases to create the most powerful end-to-end platform to develop, deploy, and iterate AI faster. Since 2017, CoreWeave has operated a growing footprint of data centers covering every region of the US and across Europe, and was ranked as one of the TIME100 most influential companies of 2024. By bringing together CoreWeave’s industry-leading cloud infrastructure with the best-in-class tools AI practitioners know and love from Weights & Biases, we’re setting a new standard for how AI is built, trained, and scaled. The integration of our teams and technologies is accelerating our shared mission: to empower developers with the tools and infrastructure they need to push the boundaries of what AI can do. From experiment tracking and model optimization to high-performance training clusters, agent building, and inference at scale, we’re combining forces to serve the full AI lifecycle — all in one seamless platform. Weights & Biases has long been trusted by over 1,500 organizations — including AstraZeneca, Canva, Cohere, OpenAI, Meta, Snowflake, Square,Toyota, and Wayve — to build better models, AI agents and applications. Now, as part of CoreWeave, that impact is amplified across a broader ecosystem of AI innovators, researchers, and enterprises. As we unite under one vision, we’re looking for bold thinkers and agile builders who are excited to shape the future of AI alongside us. If you're passionate about solving complex problems at the intersection of software, hardware, and AI, there's never been a more exciting time to join our team. What You’ll Do As a software engineer on the Sweeps team, you’ll take end-to-end ownership of a user-facing product that helps practitioners design and run hyperparameter searches. You’ll balance maintaining existing systems with building new functionality, and regularly debug real user workflows that span backend logic, the UI, and user-run agents. Sweeps is a core part of the W&B product, and changes you make will directly affect how users configure experiments, run workloads on their own infrastructure, and reason about results. About The Role Own the development and evolution of the Sweeps product, maintaining existing systems while designing and shipping new functionality with a focus on backend logic and APIs Implement and evolve sweep semantics and hyperparameter generation logic Debug and resolve user-reported issues that may involve backend behavior, agent execution, or UI interactions Improve reliability, performance, and correctness of sweep execution as usage scales Build and maintain integrations between Sweeps and external hyperparameter tuning libraries (e.g. Optuna, Ray Tune) Who You Are 4+ years of experience in software engineering Backend-leaning full stack engineer with experience building and maintaining user-facing products Strong software engineering fundamentals and experience with at least one modern language such as Python, Go, or TypeScript Comfortable working in and improving legacy systems while incrementally shipping new features Able to debug complex, real-world user workflows that don’t always fit neatly into isolated components Comfortable working with a high degree of ownership and autonomy in a fast-paced environment Able to collaborate effectively with PMs and cross-functional partners to turn user needs into technical solutions Preferred Experience working on experimentation systems, developer tools, or ML-related products Familiarity with hyperparameter optimization or ML workflows Experience integrating third-party libraries or SDKs into a product Wondering if you’re a good fit? We believe in investing in our people, and value candidates who can bring their own diversified experiences to our teams – even if you aren't a 100% skill or experience match. Here are a few qualities we’ve found compatible with our team. If some of this describes you, we’d love to talk. You enjoy owning a product end-to-end and balancing new feature development with maintaining existing systems. You like debugging real user workflows and understanding how backend behavior, user-run code, and product semantics interact. Why Us? About We work hard, have fun, and move fast! We’re in an exciting stage of hyper-growth that you will not want to miss out on. We’re not afraid of a little chaos, and we’re constantly learning. Our team cares deeply about how we build our product and how we work together, which is represented through our core values: Be Curious at Your Core Act Like an Owner Empower Employees Deliver