Principal Software Engineer - Models

Responsibilities

• Own the frontend architecture, performance, stability, and reliability of the W&B Models application.
• Set performance targets, instrument the application, and drive improvements validated with production data.
• Define application delivery, rendering, code-splitting, and frontend architecture decisions.
• Partner with backend and platform teams on API design and moving work out of the client.
• Lead large-scale architectural overhauls and coordinate requirements across engineering teams.
• Shape other teams' designs, build organizational consensus, and execute owned plans through production.

Requirements

• 8+ years of experience building user-facing software, with deep frontend architecture and performance expertise.
• Experience leading the transformation of a large, long-lived React application and owning the outcome.
• Strong React and TypeScript skills with production GraphQL experience and expertise in Redux or Zustand.
• Ability to analyze frontend and backend traces, identify performance bottlenecks, and quantify improvements.
• Strong client-side caching fundamentals, including normalization, invalidation, and large-scale failure modes.
• Hands-on experience with bundlers, build tooling, code splitting, and delivery tradeoffs.
• Sufficient backend depth to design high-level systems and API architectures.
• Track record of validating ideas, coordinating across engineering teams, and sequencing cross-organizational work.
• Preferred: experience with automated lint rules, CI gates, performance budgets, data-dense or visualization-heavy applications, and configurable products.
• Preferred: familiarity with Datadog RUM and APM or comparable observability tools, working knowledge of Go, and exposure to ML, MLOps, or AI agent workflows.

Benefits

• US full-time benefits include fully company-paid medical, dental, and vision insurance; life insurance; disability insurance; flexible spending and health savings accounts; tuition reimbursement; ESPP participation; mental wellness benefits; family-forming support; paid parental leave; childcare support; and a 401(k) with employer match.
• Flexible PTO, a casual work environment, and catered lunch at office and data center locations are offered.
• The role includes a discretionary bonus and equity awards in addition to base salary.
• Benefits vary by location for roles outside the United States.