Senior UI/UX Designer — AI Workflow Platform (London)
Location: London (onsite)
Employment Type: Full-time
Compensation: Competitive salary + meaningful equity
About the Company
Threesixfive is partnering with a fast-growing London-based startup operating at the intersection of AI, design, and creative tooling. Backed by £4.5M in early funding and preparing for a Series A round, the company is building frontier AI workflow software that gives creators unprecedented control over how they design stories, 3D assets, and game-ready experiences.
The platform allows users to orchestrate multiple AI models through an intuitive interface — transforming complex AI operations into creative, visual workflows.
The Opportunity
We’re looking for a Senior UI/UX Designer to join as one of the company’s founding design hires. This is a chance to shape the look, feel, and usability of a product that sits at the edge of what’s possible with generative AI.
Working closely with the CEO and CTO, you’ll help define how creators interact with advanced AI tools — ensuring that every touchpoint feels intuitive, powerful, and beautifully designed.
You’ll be joining a small, talented, and deeply technical team that values design as a strategic advantage.
What You’ll Do
Lead the end-to-end design process — from conceptualisation to high-fidelity UI and interactive prototypes.
Define and own the product’s visual language and interaction patterns.
Translate complex AI functionality into elegant, creator-friendly interfaces.
Collaborate directly with engineers and leadership to bring ideas to life in an agile, iterative environment.
Build and maintain a design system that scales with the product.
Contribute to product thinking and UX strategy, helping prioritise what delivers the most value for users.
About You
We’re looking for someone who thrives at the intersection of creativity and systems thinking — a designer who can make advanced technology feel approachable and inspiring.
You’ll likely have:
5+ years of experience in product design, with a focus on complex web platforms or creative tools.
Strong UI craft and a portfolio demonstrating both visual polish and interaction design depth.
Proven ability to translate abstract concepts or technical workflows into clear, usable experiences.
A deep understanding of user-centric design principles and modern product development processes.
Experience collaborating closely with engineers and product leaders in fast-moving startups.
Interest or experience in AI, creative tooling, or 3D/interactive design is a big plus.
Why This Role?
Be part of a high-impact founding team working on cutting-edge AI applications.
Shape a platform that will empower creators across film, gaming, and design industries.
Collaborate directly with visionary founders and top-tier engineers.
Earn meaningful equity in a company with strong early momentum and upcoming Series A.
If you’re excited about building tools that redefine how humans and AI collaborate — and you want to be at the centre of a new creative frontier — we’d love to hear from you. Send your CV to kris@threesixfive.es