Skills

Problem-solving Architecture react FastAPI

Job Specifications

Senior Product Engineer | FullStack (FastAPI, React, Supabase) | AI Start Up

Salary: Up to £100k + meaningful equity
Location: Zone 1 Central London Offices - 5 days/week on-site

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
In-office, Monday–Friday

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

FastAPI backend development
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

Why join

You’ll join a deeply AI-native engineering culture where you’ll help define how humans and agents build products together. You will:

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

Senior Product Engineer | FullStack (FastAPI, React, Supabase) | AI Start Up

About the Company

We are Prism Digital, your DevOps and Cloud talent partner. Proud sponsors and co-organisers of the London DevOps meetup group. We are a niche consultancy with a tight focus on driving quality over quantity. We pride ourselves on our consultative approach, our extensive knowledge of the DevOps, Cloud and infrastructure sector and most importantly how important great talent is to help your company grow and succeed. We offer: • Expertise in Cloud (AWS, Azure, GCP), Linux, Windows, CI/CD, Configuration Management, IaC, Cont... Know more