Full Stack Engineer

Prism Digital; England; On-site; GBP 90,000 - 110,000; Full time

Job summary

A tech company in Central London is seeking a Full Stack Engineer to join their high-calibre team focused on building AI-native products. You will design and develop scalable backend services, shape technical direction, and lead innovative projects in a fast-paced environment. The ideal candidate has strong full-stack experience and a resilient problem-solving mindset. This role offers a chance for deep ownership in an exciting new category of product development.

Qualifications

• Experience with multimodal models or agent UX is a plus.
• Founding engineer background is desirable.
• Ability to prototype new models of human-agent collaboration.

Responsibilities

• Influence core platform architecture during foundational stage.
• Build and iterate on multimodal agent systems.
• Work closely with founders on strategy and product direction.

Skills

Full-stack engineering experience

End-to-end feature shipping in containerised environments

Strong problem-solving mindset

Comfortable navigating ambiguity

Tools

React

Supabase or similar cloud-native backend tools

Job description

Base pay range

Direct message the job poster from Prism Digital

• Salary: Up to £100k + meaningful equity
• Location: Zone 1 Central London Offices, On-site
• Please note: sponsorship is not available at this time.

The Role

You’ll join a small, high‑calibre engineering team building AI‑native products from the ground up. In this role, you will work across the full stack to architect, build, and ship production systems powering multimodal AI agents. You’ll design intuitive interaction models for human–AI collaboration, develop scalable backend services, and rapidly prototype new features at pace.

You’ll also work directly with the founding team to shape technical direction, defining the platform architecture and helping build a genuinely new category of agent‑led product development. This is a true 0→1 engineering environment where you’ll have deep ownership and impact.

Non‑Negotiables

• Full‑stack engineering experience with production delivery
• Ability to ship end‑to‑end features in containerised environments
• Comfortable navigating ambiguity, shifting priorities, and rapid experimentation
• Strong problem‑solving mindset with ownership and resilience

Nice to Haves

• Founder or founding engineer background
• Experience building interfaces for agentic workflows
• Exposure to LLMs, multimodal models, or agent UX (AX)
• Experience shaping technical strategy in early‑stage teams

What You’ll Work With

• React engineering and modern frontend tooling
• Supabase or similar cloud‑native backend tools
• LLM agent workflows: tool calling, memory, retries, context updates
• Human–AI interaction models and agent UX (AX) design
• System design, architecture evolution, and scaling pathways
• MCP integrations and multimodal agent capabilities

Responsibilities

• Influence core platform architecture during its foundational stage
• Build and iterate on multimodal agent systems
• Prototype and refine new models of human–agent collaboration
• Work closely with founders on strategy and product direction
• Be part of a high‑intensity, supportive team obsessed with building exceptional products

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Engineering and Information Technology

Industries

Software Development, Technology, Information and Media, and IT Services and IT Consulting

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