Senior Full Stack Developer

About Delta Labs

Delta Labs uses AI to simulate and predict consumer behaviour at scale. We build Elaiia, a simulation engine that generates AI Twins, intelligent synthetic agents that mirror real consumer populations. Our clients use Elaiia to simulate customer decisions before committing to them: pricing strategies, product launches, campaign messaging, channel allocation. We replace surveys, focus groups, and intuition with simulation-based evidence.

We're a small, focused team and we intend to stay that way. We give people ownership, trust, and the autonomy to do their best work. We work with urgency and intellectual honesty and expect new team members to match our pace. We seek individuals who are curious, rigorous, and want their work to have demonstrable impact. If you're drawn to the idea of a small team building something that hasn't existed before, let's build together.

About The Role

As a Full Stack Developer at Delta Labs, you will design and build the systems that power Elaiia’s simulation platform. The Engineering team owns the full stack, from database schema to production UI, and is responsible for making Elaiia fast, reliable, and scalable.

THE STACK

Next.js, React, Shadcn UI, Tailwind CSS on the frontend. PostgreSQL with Drizzle ORM on the backend. OpenAI, Antrophic and Google Gemini deeply integrated into the product layer. Deployed on Vercel and Microsoft Azure.

Responsibilities

• Design and build production features across the full stack, from data model to UI
• Integrate LLM APIs into production workflows: prompt pipelines, structured outputs, token optimization, and reliability at scale
• Own entire features end-to-end and take responsibility for their performance, quality, and correctness
• Collaborate with the research team to transition experimental AI capabilities into production-grade systems
• Improve and extend the platform architecture as simulation workloads grow in complexity and volume
• Ship continuously to maintain the pace the company needs
  
  
  

YOU MAY BE A FIT IF

• You have 3+ years of experience shipping production web applications in TypeScript and JavaScript
• You are strong in React and Next.js and care about code quality, performance, and maintainability
• You have designed relational database schemas that hold up under real-world scale and complexity
• You have worked with or are deeply curious about LLM integration — prompt engineering, structured outputs, retrieval-augmented generation, agent architectures
• You use AI tools as a core part of your development workflow and consider AI-assisted engineering the standard, not optional
• You are comfortable working with ambiguity and incomplete specifications
• You communicate clearly about technical trade-offs and write useful documentation
  
  
  

STRONG CANDIDATES MAY ALSO

Have built AI-powered features used by real customers in production

Have direct experience with our stack: Drizzle ORM, Shadcn UI, Tailwind CSS, Vercel, Azure

Have worked in a high-velocity early-stage environment

Have experience scaling systems that handle complex, long-running computational workloads

LOCATION

This role is based in Switzerland. We work from Zürich and meet regularly in person. Candidates should be based in Switzerland or open to relocation.

Benefits

We offer a competitive salary, potential equity participation, and the opportunity to build a company from its earliest stages. Delta Labs is an equal opportunity employer. We welcome applications from all backgrounds.