Senior Full Stack Engineer

At Caffeine.ai, we are building the world’s first platform that turns natural language into full-stack, modern applications that are deployed into a sovereign cloud, the Internet Computer. Our mission is to make building software as simple as a conversation—transforming ideas into live, production systems in minutes.

A core part of Caffeine is the App Market: a place where applications created through conversation can be published, discovered, remixed, and extended by other users. We are building both the platform and the initial set of high-quality applications that populate it.

We are a cross-functional team of engineers and researchers building the AI that powers this new paradigm. To do this, we need world-class product engineers who can design beautiful, reliable, and performant experiences across the entire stack.

About the Role

As a Senior Full Stack Engineer, you will own vertical slices of the Caffeine platform—from data models and APIs to real-time user interactions in the browser. This is not a role where frontend and backend are “handed off” between teams. You will regularly design the API you consume, evolve the data model behind it, and ship the UI that makes it usable.

You will work in TypeScript across the entire stack, building systems that integrate AI-driven code generation, while ensuring they feel fast, reliable, and intuitive to users.

This role is for a true generalist with deep expertise in TypeScript. This is a high-agency role for an engineer who cares as much about API latency and data integrity as they do about render performance and UX.

What You’ll Do

• Design and ship end-to-end features: Design and ship end-to-end features using TypeScript, Node.js, and React. You will make architectural decisions that span the Data model, API, and UI to ensure type safety, consistency, and scalability.
• Build the "AI-Native" Experience: Work with AI researchers to integrate LLM capabilities into the product. You will handle the complex state management required to stream AI responses while maintaining a responsive, seamless UI.
• Own backend and frontend quality: Optimize API latency, data access patterns, and background workflows—while also managing React render performance, state complexity, bundle size.
• Operate with high autonomy: Take features from vague problem statements to production. This includes clarifying requirements, proposing solutions, implementing them, and validating outcomes.
• Drive Engineering Standards: Champion code quality across the stack. You will add testing (unit, integration, e2e) and observability (logging, tracing, user analytics) to ensure we ship with confidence.
• Partner on product decisions: You are a product engineer, not just a ticket-taker. You will work closely with product and design to shape platform capabilities, challenging assumptions where needed.

Who You Are

• Experienced: You have 7 years of experience building production web applications and distributed systems.
• A True Full-Stacker: You are highly proficient in both the backend (Node.js, SQL/NoSQL, API design) and the frontend (React, modern CSS, state management). You don't just "get by" in one area; you work independently in both.
• TypeScript Native: You leverage TypeScript’s full power to ensure safety and developer velocity across the entire stack.
• Strong product sense: You have a strong sense of UX and care deeply about the end-user experience, but you build with the pragmatism required to ship fast.
• Curious & Adaptable: You are excited by the intersection of AI-driven development and sovereign web technologies (Web3).
• High Ownership: You thrive in fast-moving environments where you are expected to take an idea from concept to deployment independently.

Bonus Points

• Experience with PostgreSQL and event-driven architectures.
• Familiarity with marketplaces and app platforms
• Experience with SSR, SPA trade-offs, and SEO
• Knowledge of DevOps (Docker, Kubernetes, Observability).
• Interest in Web3 or blockchain-based systems

*This is a hybrid role based in our Zurich office, with a requirement of 3 days in the office per week.