Senior Software Engineer, Metrics Platform

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.

• The Metrics Platform team builds and scales the infrastructure behind Weights & Biases’ flagship Models product, which powers experiment tracking and analytics for over 2,500 of the world’s leading AI and ML teams.
• The team focuses on data ingestion, storage, and querying at a petabyte scale, optimizing for performance, reliability, and cost‑effectiveness.

As a Software Engineer, you’ll lead efforts to scale our metrics and storage systems to meet the needs of our most advanced customers. Day to day, you’ll set technical direction, balancing near‑term deliverables with long‑term architectural improvements. You’ll partner with product, revenue, and engineering teams across W&B to evolve our platform and ensure it continues to meet customer demands. You’ll also help mentor engineers and drive best practices across the organization.

• 4+ years of experience in software engineering, with a focus on backend performance and/or distributed systems
• Strong software engineering fundamentals and proficiency in at least one modern programming language (Python, Go, Type Script, etc.)
• Experience designing and scaling customer‑facing APIs in production, ideally leveraging systems such as MySQL, Clickhouse, Bigtable, Pub/Sub, or Kafka
• Hands‑on experience with Kubernetes, Terraform, and at least one major cloud provider (GCP, AWS, or Azure)

• Experience mentoring junior engineers and collaborating with other business functions
• Background in large‑scale metrics, logging, or analytics systems
• Familiarity with designing cost‑optimized storage and query infrastructure

• You love building scalable systems that handle massive amounts of data efficiently
• You’re curious about how ML teams use metrics and analytics to accelerate research
• You’re an expert in distributed systems and API design

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 Best‑in‑Class Client Experiences
• Achieve More Together

We support and encourage an entrepreneurial outlook and independent thinking. We foster an environment that encourages collaboration and provides the opportunity to develop innovative solutions to complex problems. As we get set for takeoff, the growth…