Java Developer jobs in United Kingdom

Listo is building the infrastructure layer for AI-native distribution.

We help companies turn their existing APIs, products, and services into AI-native applications that run inside platforms like ChatGPT and other agentic systems.

We automate the entire lifecycle of AI app integration: MCP server generation, AI-native UI, hosting, deployment, monitoring, and optimisation for invocation and visibility.

Our conviction: AI platforms are the next major distribution channel, much like the App Store was a decade ago and we want to empower any business to participate.

We are an early-stage company operating at the edge of a fast-moving ecosystem. This is not a maintenance role. It’s about designing, shipping, and operating new infrastructure under real-world constraints, with real customers and real stakes.

We’re looking for a Founding Software Engineer to join Listo at the ground floor and help define our technical DNA.

You’ll work hand-in-hand with the CTO and founders on architecture, platform design, and long-term technical decisions. This is a true ownership role: you’ll build systems that must scale, operate them in production, and evolve them as customers and complexity grow.

What You’ll Do

• Design and build foundational backend and platform systems
• Own critical parts of the platform from design through production
• Define engineering patterns, standards, and best practices
• Collaborate closely with founders on roadmap and product direction
• Think deeply about scalability, reliability, and maintainability

What We’re Looking For

You’ll be a great fit if you:

• Have experience building and operating production systems
• Have worked in a startup or scale-up environment
• Are comfortable making architectural trade-offs in ambiguous situations
• Care deeply about system reliability and product quality
• Enjoy influencing both technical and product decisions

Preferred Tech Stack

Strong experience in several of the following is expected:

• Backend & Platform: TypeScript, Node.js, Python
• System Design: APIs, distributed systems, multi-tenant architectures
• Agentic Systems: LLM-driven workflows, orchestration, evaluation pipelines
• Infrastructure: Kubernetes, Docker, CI/CD, GCP or AWS
• Observability: Metrics, logging, tracing, alerting

You Might Be an Excellent Fit If

• You’ve led products from early versions into production
• You’ve built agentic systems, MCP servers, or AI-native apps before
• You’re excited to help shape both the product and the engineering culture
• You enjoy working closely with a driven, early-stage founding team