About HASH

About the role

What you'll work on

• Design, build, and ship production-ready React/TypeScript components and app-wide features for complex data-driven UIs
• Work with mathematical experts to convert world-modeling theory formalizations into software requirements, and writing tests which ensure implementation correctness
• Convert novel UX/UI designs — for new world modeling and AI-interaction features — into performant, responsive and accessible experiences that work across devices
• Establish project-wide standards for code quality (e.g. via linting), review and testing, and provide feedback on the work of other frontend engineers
• Profile and optimize rendering performance for complex interactions and visualisations
• Tell the story of best practices and lessons learned in developing and testing novel, complex world-modeling interfaces, e.g. via blog posts and workshops
• Partner with backend/infra teams to identify and manage interdependencies, and to help define robust APIs that support excellent, feature-rich frontend performance
• Stay on top of emerging browser capabilities and drive adoption of the ones that matter

Requirements

Must have

• Expertise with React, TypeScript, modern HTML & CSS
• Proven track record architecting and delivering rich web apps that involve complex user interactions
• Rigorous approach to documenting and versioning components for external audiences
• Experience profiling and debugging performance in devtools
• Comfortable taking a visible technical leadership role, mediating discussions around standards and implementation approaches, and taking accountability for the delivery of features on time and to spec
• Excellent written & verbal communication in English and comfort working async

Nice to have

• Familiarity with process/model-oriented UIs: BPMN, UML, systems-dynamics models, graphs, etc.
• Understanding of WCAG 2.2 and pragmatic accessibility techniques (ARIA, focus management, keyboard UX)
• Public record of maintaining a well-documented, semantically versioned library (ideally in an open-source context)
• Experience with CRDTs or other real-time collaboration solutions
• Hands-on experience with WebAssembly pipelines
• Canvas/WebGL experience for high-performance rendering

Benefits

• Employer pension contributions
• At least 30 days holiday annually
• Quarterly in-person team retreats around the world