Senior Frontend Engineer — AI World-Modeling Apps + Equity

HASH; Greater London; Hybrid; GBP 70,000 - 120,000; Full time

Benefits offered by this job

Equity compensation

Pension contributions

30 days holiday

Global team retreats

Job summary

HASH is hiring a senior frontend engineer in London or Berlin to own end-to-end delivery of world-modeling and AI-native interface components. You’ll shape frontend architecture and collaborate with AI engineers, researchers, and product management to build novel, accessible web apps for researchers and enterprises.

You will translate complex data into intuitive UIs, drive performance, accessibility, and maintainability, and help define robust frontend APIs while keeping delivery on time and to

Qualifications

• Expertise with React, TypeScript, modern HTML & CSS.
• Proven track record architecting and delivering rich web apps with 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.

Responsibilities

• 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 into software requirements and write tests to ensure correctness.
• Convert UX/UI designs for world modeling and AI-interaction features into performant, responsive experiences across devices.
• Establish project-wide standards for code quality, linting, review, testing, and provide feedback on 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 interfaces via blog posts and workshops.
• Partner with backend/infra teams to define robust APIs for frontend performance.
• Stay on top of emerging browser capabilities and drive adoption where relevant.

Skills

React

TypeScript

HTML & CSS

Web app architecture

Performance debugging

English communication

Job description

HASH is hiring a senior frontend engineer in London or Berlin to own end-to-end delivery of world-modeling and AI-native interface components. You’ll shape frontend architecture and collaborate with AI engineers, researchers, and product management to build novel, accessible web apps for researchers and enterprises.

You will translate complex data into intuitive UIs, drive performance, accessibility, and maintainability, and help define robust frontend APIs while keeping delivery on time and to