Senior Software Engineer, Mobile (iOS)

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

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 already seeing adoption 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.

About the role

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 is modern Swift 6 and SwiftUI with a clean modular architecture, and you'll have significant influence over technical direction as the team grows. You'll work closely with a dedicated designer, product manager, and one other full-time engineer, and collaborate with backend engineers across multiple W&B product areas. Mobile is becoming the surface for a broad set of W&B entrypoints beyond workspaces and visualization, and you'll be building across all of them.

Like any role at a hyperscaler, this comes with high accountability and ownership. You'll own the features you build from design through production, and you'll care deeply about the experience ML practitioners have 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

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 care about craft and you take pride in building mobile experiences that feel polished and fast.You're excited about joining a product that just launched and helping define what it becomes, rather than maintaining something that's already fully formed.You understand that the best mobile apps for technical users are the ones that respect their time and surface the right information at the right moment.

Why Us?

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 opportunities within the organization are constantly expanding. You will be surrounded by some of the best talent in the industry, who will want to learn from you, too. Come join us!

The base salary range for this role is $139,000 to $204,000. The starting salary will be determined based on job-related knowledge, skills, experience, and market location. We strive for both market alignment and internal equity when determining compensation. In addition to base salary, our total rewards package includes a discretionary bonus, equity awards, and a comprehensive benefits program (all based on eligibility). 

What We Offer

The range we’ve posted represents the typical compensation range for this role. To determine actual compensation, we review the market rate for each candidate which can include a variety of factors. These include qualifications, experience, interview performance, and location.

In addition to a competitive salary, we offer a variety of benefits to support your needs, including:

• Medical, dental, and vision insurance - 100% paid for by CoreWeave
• Company-paid Life Insurance 
• Voluntary supplemental life insurance 
• Short and long-term disability insurance 
• Flexible Spending Account
• Health Savings Account
• Tuition Reimbursement 
• Ability to Participate in Employee Stock Purchase Program (ESPP)
• Mental Wellness Benefits through Spring Health 
• Family-Forming support provided by Carrot
• Paid Parental Leave 
• Flexible, full-service childcare support with Kinside
• 401(k) with a generous employer match
• Flexible PTO
• Catered lunch each day in our office and data center locations
• A casual work environment
• A work culture focused on innovative disruption

Our Workplace

While 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 for specialized skill sets. New hires will be invited to attend onboarding at one of our hubs within their first month. Teams also gather quarterly to support collaboration

California Consumer Privacy Act - California applicants only

CoreWeave is an equal opportunity employer, committed to fostering an inclusive and supportive workplace. All qualified applicants and candidates will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information.

As part of this commitment and consistent with the Americans with Disabilities Act (ADA), CoreWeave will ensure that qualified applicants and candidates with disabilities are provided reasonable accommodations for the hiring process, unless such accommodation would cause an undue hardship. If reasonable accommodation is needed, please contact: careers@coreweave.com.