Senior Full Stack Developer

About the role

Delta Labs is building Elaiia, an AI‑driven simulation engine that creates intelligent synthetic agents to mirror real consumer populations. As a Senior Full Stack Developer you will design and build the systems that power this platform, working across the entire stack from database schema to production UI.

Key responsibilities

• Design and build production features across the full stack, from data model to UI.
• Integrate LLM APIs into production workflows, including prompt pipelines, structured outputs, token optimization and reliability at scale.
• Build and operate long‑running, multi‑step simulation workflows as durable background jobs.
• Own entire features end‑to‑end, ensuring performance, quality and correctness.

Required profile

• 4+ years of experience shipping production web applications in TypeScript.
• Strong expertise in the modern React/Next.js ecosystem with focus on code quality and performance.
• Proficiency in Python or willingness to work with Python backend services.
• Experience designing relational database schemas that scale.
• Interest or experience with LLM integration, prompt engineering and agent architectures.

Required skills

• TypeScript
• React
• Next.js
• PostgreSQL
• Python
• LLM APIs (OpenAI, Anthropic, Google Gemini)
• LangGraph
• Azure
• Vercel

What we offer

• Competitive salary and potential equity participation.
• Opportunity to build a company from its earliest stages.