Senior Software Engineer Workspaces

About Us

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.

We’re 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. As part of Core Weave, that impact is amplified across a broader ecosystem of AI innovators, researchers, and enterprises.

The Models team builds and maintains the core user experience for tracking, visualizing, and analyzing machine learning experiments at Weights & Biases. Our full‑stack engineering team works closely with Product, Design, and Platform partners to deliver high‑impact, customer‑facing features. We balance strong foundations in performance and reliability with a focus on building intuitive tooling that supports ML workflows at scale for both individual researchers and large ML organizations.

As a Senior Software Engineer on the Models team, you will build core features that directly improve how ML engineers interact with and understand their experiment data. You will solve complex technical challenges across the stack to unlock faster, more reliable, and more intuitive user experiences. Working closely with Product and Design, you will translate nuanced user needs into high‑quality, user‑facing implementations.

This role emphasizes technical ownership, iterative delivery, and raising the bar for performance and reliability at scale.

• 5+ years of professional software engineering experience building and operating production web applications.
• Demonstrated experience owning and delivering complex, user‑facing features end to end, from technical design through release.
• Strong experience with frontend development, including building complex user interfaces using React and Type Script.
• Strong experience with backend development, including designing, implementing, and maintaining backend services.
• Proven ability to solve complex technical problems that impact performance, reliability, or usability in large‑scale applications.
• Experience working with APIs and data‑fetching layers, with an understanding of how backend design affects frontend performance and user experience.
• Ability to independently drive technical decisions and break down ambiguous problems into iterative, deliverable work.
• Demonstrated technical leadership through influencing architecture, establishing or evolving technical patterns, and raising engineering best practices within a team or across the organization.

• Experience working on data‑intensive or analytics‑heavy web applications.
• Experience with Graph
  
  QL APIs, including query optimization and performance tuning.
• Experience with Go or another compiled backend language.
• Experience improving frontend performance for complex, highly interactive user interfaces.
• Familiarity with tools, workflows, or products used by ML engineers, data scientists, or research teams.
• Experience contributing to or evolving shared technical patterns and best practices across multiple teams.

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…