Job Details

Overview

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 in the US and Europe, and was named among TIME100 most influential companies of 2024. By combining CoreWeave's cloud infrastructure with W&B tools, we're enabling the full AI lifecycle — experiment tracking, model optimization, high-performance training clusters, agent building, and inference at scale — in one platform. We're uniting to empower developers with the tools and infrastructure they need to push AI forward.

Weighs & Biases has been trusted by over 1,500 organizations including AstraZeneca, Canva, Cohere, OpenAI, Meta, Snowflake, Square, Toyota, and Wayve. As part of CoreWeave, its impact is amplified across a broader ecosystem of AI innovators, researchers, and enterprises.

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

You'll be joining the Mobile team within the ML Workflows organization. We recently launched the W&B iOS app at NVIDIA GTC 2026, bringing run monitoring, project browsing, metric visualization, and push notifications to ML practitioners on the go. The app is live on the App Store and is being adopted across research labs, universities, and AI companies. We're now building on that momentum to expand the mobile experience and make W&B the app ML engineers check first when they want to know how their training runs are going.

As a Senior Engineer on the Mobile team, you'll be one of the first engineers shaping the future of W&B's mobile experience. Your day-to-day will involve building new iOS features end-to-end, from the data layer through shipping to the App Store. You'll work on charting and data visualization for ML metrics, real-time notifications, offline support, and deeper integrations with the W&B platform via GraphQL APIs. The codebase uses Swift 6 and SwiftUI with a clean modular architecture, and you'll have significant influence over technical direction as the team grows. You'll collaborate with a dedicated designer, product manager, and one other full-time engineer, and work with backend engineers across multiple W&B product areas. Mobile is becoming the surface for a broad set of W&B entry points beyond workspaces and visualization, and you'll be building across all of them.

You'll own the features you build from design through production and care deeply about the ML practitioner experience with the app every day.

Who You Are

• 4+ years of professional iOS development experience
• Strong proficiency in Swift and SwiftUI
• Experience shipping and maintaining apps on the App Store
• Experience using and maintaining mobile design systems
• Solid understanding of iOS app architecture patterns (MVVM, dependency injection, modular codebases)
• Experience with GraphQL or RESTful API integration in mobile apps
• Experience with push notifications (APNs, Firebase/FCM)
• Strong focus on writing clean, well-tested, and maintainable code
• Comfortable working in a small team with high autonomy and direct impact on product direction
• Experience with CI/CD pipelines for iOS (GitHub Actions, CircleCI, or similar)

Preferred

• Experience with ML tools, developer tools, or data-intensive applications
• Familiarity with Tuist or similar build system tooling for modular iOS projects
• Experience with observability and logging in mobile apps (Datadog, Sentry, or similar)
• Background in building real-time or near-real-time data display on mobile
• Familiarity with data visualization and charting on iOS (Swift Charts or similar)
• Experience with product analytics instrumentation (Segment, Amplitude, or similar)
• Knowledge of Auth0 or similar authentication frameworks on iOS
• Experience with accessibility and internationalization on iOS
• Previous work on apps used by technical or developer audiences

About You and Us

We believe in investing in our people and value candidates who bring diverse experiences, even if you aren't a 100% match. You care about craft and you take pride in building mobile experiences that feel polished and fast. You're excited to join a product that just launched and help define what it becomes. You understand that the best mobile apps for technical users surface the right information at the right moment.

Compensation and Benefits

The base salary range for this role is $139,000 to $204,000. Starting salary will be determined based on knowledge, skills, experience, and location. We offer a discretionary bonus, equity awards, and a comprehensive benefits program (eligibility applies). Benefits include medical, dental, vision, life insurance, disability, flexible spending and health savings accounts, tuition reimbursement, ESPP, mental health support, parental leave, childcare support, 401(k) with employer match, flexible PTO, and remote-friendly options where applicable.

Our Workplace and Compliance

We prioritize a hybrid work environment; remote work may be considered for candidates located more than 30 miles from an office, based on role requirements. New hires will attend onboarding at a hub within their first month. We comply with applicable laws and emphasize equal opportunity employment. CoreWeave may provide reasonable accommodations during the hiring process upon request.

Export Control

This position requires access to export controlled information. To conform to U.S. Government export regulations, applicants must meet certain criteria as described by policy. CoreWeave may decline to pursue export licensing when required.