Principal Software Engineer - Models

CoreWeave is The Essential Cloud for AI™. Built for pioneers by pioneers, CoreWeave delivers a platform of technology, tools, and teams that enables innovators to build and scale AI with confidence. Trusted by leading AI labs, startups, and global enterprises, CoreWeave combines superior infrastructure performance with deep technical expertise to accelerate breakthroughs and turn compute into capability. Founded in 2017, CoreWeave became a publicly traded company (Nasdaq: CRWV) in March 2025. Learn more at www.coreweave.com.What You’ll DoYou will own the frontend architecture of the W&B app, the product ML researchers and engineers work in every day, and be accountable for app performance, stability and reliability.A single page in W&B assembles data from many parts of the product, which power different product features owned by different teams. Individually those requests are all reasonable; in aggregate they contribute to increased load times and a worse experience for users. Performance here is a question of composition: what queries each page needs before it can render, what queries can add to that set, and how those boundaries hold as the product grows. You'll define those boundaries and make the calls they depend on.This role is frontend-led but architecture-deep and organizationally wide. You'll spend time shaping other teams' designs and building consensus across boundaries, and you'll own execution of your own plans when that's what it takes to land them.RequirementsIn this role you'll be responsible for the architecture, performance, and stability of the W&B Models frontend, defining the frontier of innovation for the team, and managing cross team requirements within the Models system. Some examples of what you’ll do:Setting performance targets and driving the work that meets them, with results proven in production dataDeciding the app's delivery and rendering architecture, including how code is delivered efficientlyPartnering with backend and platform teams on API design, including moving work out of the clientProposing and driving the larger overhauls that incremental work cannot reachInvesting in our people is one of our top priorities, and we value candidates who can bring their diversified experiences to our teams. Here are some qualities we’ve found compatible with our team. We'd love to talk about whether this aligns with your experience and interests and what you’re excited to work on next.Who You AreMinimum Qualifications8+ years building user-facing software, with deep expertise in frontend architecture and performanceHave led the transformation of a large, long-lived React application with a focus on performance, product impact and dev experience and owned the outcomeStrong command of React and TypeScript, with production experience in GraphQL and a modern state management approach such as Redux or Zustand, including opinions on when each is the right toolReal performance engineering skill: you can instrument an application, read both frontend and backend traces, determine precisely where time is going, and prove the improvement with numbersSolid client-side caching fundamentals, including normalization, invalidation, and the failure modes that appear at scaleHands-on experience with bundlers and build tooling, and clear views on code splitting and delivery tradeoffsEnough backend depth to design systems at a high level. You can propose a new API architecture in service of a faster client and reason about its frontend implicationsTrack record of validating ideas, coordinating across engineering teams, and sequencing work that spans organizational boundariesAn operator mindset: you measure, you ship, you follow through, and you stay close to productionPreferred QualificationsExperience introducing automated enforcement such as lint rules, CI gates, or performance budgets that changed engineering behavior broadlyBackground in data-dense or visualization-heavy applications where rendering cost and data volume are the core constraintsFamiliarity with observability tooling such as Datadog RUM and APM, or comparable tracing and session-replay stacksWorking knowledge of Go or a similar backend languageExposure to ML, MLOps, or AI agent workflows, or genuine curiosity about the researchers and engineers who use these toolsExperience with a highly configurable product, where the space of user and deployment settings can't be exhaustively testedThe base salary range for this role is $227,000 to $303,000. 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 OfferThe 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. The benefits below reflect our US-based offerings for full-time employees; for roles in other locations, benefits vary and are shared during the hiring process. These include:Medical, dental, and vision insurance - 100% paid for by CoreWeaveCompany-paid Life Insurance Voluntary supplemental life insurance Short and long-term disability insurance Flexible Spending AccountHealth Savings AccountTuition Reimbursement Ability to Participate in Employee Stock Purchase Program (ESPP)Mental Wellness Benefits through Spring Health Family-Forming support provided by CarrotPaid Parental Leave Flexible, full-service childcare support with Kinside401(k) with a generous employer matchFlexible PTOCatered lunch each day in our office and data center locationsA casual work environmentA work culture focused on innovative disruptionCalifornia ApplicantsCalifornia Consumer Privacy Act Equal Opportunity & AccommodationsCoreWeave 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.Export Control ComplianceThis position requires access to export controlled information. To conform to U.S. Government export regulations applicable to that information, applicant must either be (A) a U.S. person, defined as a (i) U.S. citizen or national, (ii) U.S. lawful permanent resident (green card holder), (iii) refugee under 8 U.S.C.1157, or (iv) asylee under 8 U.S.C.1158, (B) eligible to access the export controlled information without a required export authorization, or (C) eligible and reasonably likely to obtain the required export authorization from the applicable U.S. government agency. CoreWeave may, for legitimate business reasons, decline to pursue any export licensing process.