As a Design Engineer, you'll bridge the gap between engineering and design—owning the craft of building elegant, high-performance UI and design systems that scale. You'll work across our TypeScript/React frontend and collaborate closely with product and backend engineers to shape the future of how AI teams build products.
We’re a small, smart, and hardworking team operating at the frontier of AI. Our customers demand world-class performance, reliability, and usability, and we aim to set the standard for intuitive design that enables product leaders and non-technical subject matter experts to collaborate effectively with developers.
About the roleYou’ll be responsible for:
Designing and building high-quality, reusable UI components and design systems that scale.
Crafting seamless, beautiful user experiences that make complex AI workflows intuitive.
Bringing designs to life with polished, accessible, and performant front-end code.
Making strong calls on when to build in-house solutions versus leveraging existing tools.
Owning the end-to-end implementation of features that balance usability, aesthetics, and engineering efficiency.
Advocating for best practices in design, accessibility, and front-end architecture.
Engaging with users to understand their needs, ensuring the product is both functional and delightful.
You have a deep appreciation for great design and care about the finer details of UI/UX.
You are equally comfortable designing interfaces and implementing them in code.
You understand systems thinking and have experience building scalable design systems.
You are capable in Figma
You have strong frontend engineering skills in TypeScript, React, and TailwindCSS (or equivalent modern stacks).
You are excited by AI and its potential, and want to shape the way teams interact with it.
You hold yourself and others to a high bar, striving for elegance and simplicity in design and code.
You thrive in a fast-moving startup environment and want to have real impact.
You communicate clearly, collaborate well, and enjoy engaging with users to improve the product.
We aim for a modern, pragmatic stack that optimizes for speed and developer happiness:
Frontend: TypeScript, React, Next.js, TailwindCSS, Radix UI
Backend: FastAPI (Python), Postgres
Infrastructure: AWS
This role is primarily for San Francisco.
If London is a more suitable location for you that can be arranged. We work in our HQ in SoMa, with flexibility as needed.
Skills Required
- Experience designing and building scalable design systems
- Ability to design interfaces and implement them in code
- Capability in Figma
- Strong frontend engineering skills in TypeScript, React, and TailwindCSS or equivalent modern stacks
- Understanding of UI/UX design, accessibility, and frontend architecture best practices
- Interest in AI and its applications
- Clear communication and effective collaboration skills
- Ability to work in a fast-moving startup environment
What We Do
Humanloop enables companies to safely and effectively implement Large Language Models (LLMs) like OpenAI's GPT-4 and Anthropic's Claude in their organisations. Companies like AmexGBT, Duolingo and Gusto use the Humanloop developer platform to go faster from prototype to production application, evaluate outputs of LLMs and constantly improve them by fine-tuning models and incorporating private data. Humanloop is headquartered in London and was founded by leading machine learning experts that previously worked on some of the largest AI projects at Google, Microsoft and Amazon.
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