Software Engineer, Sweeps

Core Weave, the AI Hyperscaler™, acquired Weights & Biases to create the most powerful end-to-end platform to develop, deploy, and iterate AI faster. Since 2017, Core Weave has operated a growing footprint of data centers covering every region of the US and across Europe, and was ranked as one of the TIME
100 most influential companies of 2024. By bringing together Core Weave’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 Core Weave, 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.

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.

• 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)

• 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 Type Script
• 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

• 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

• 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.

• Be Curious at Your Core
• Act Like an Owner
• Empower Employees
• Deliver Best-in-Class Client Experiences
• Achieve More Together

The base pay for this position ranges from $109,000 to $160,000. The starting salary will be determined based on job‑related knowledge, skills,…