Arnau Julià

CTO and Full Stack Developer with experience building end-to-end digital products: architecture, backend, frontend, cloud infrastructure, and DevOps.

I have worked leading technical teams and developing scalable platforms for startups and companies, participating in both strategic decisions and hands-on implementation.

Specialized in developing modern web applications with React, Next.js, Node.js, and TypeScript, as well as cloud infrastructure on AWS, GCP, Docker, CI/CD, and automation.

I also have real experience designing and delivering AI systems in production, including autonomous agents, LLM-based workflows, integrations with OpenAI APIs, and testing/evaluation of AI systems to ensure reliability and quality in real-world environments.

I can join either as a senior developer to accelerate an existing product or lead the complete technical architecture for a new project, MVP, or growing platform.

Experience in:

• Frontend: React, Next.js, TypeScript, Tailwind

• Backend: Node.js, REST/GraphQL APIs, PostgreSQL, Redis

• Cloud & DevOps: AWS, GCP, Docker, CI/CD

• Software Architecture and Scalability

• Technical Leadership and Team Management

• AI Agent Systems and LLM Automation

• Testing and Evaluation of AI Systems in Production

I adapt quickly to the business and prioritize delivering robust, maintainable, and results-oriented solutions.

Led engineering at Anything App, an AI-powered assistant startup that combined an AI agent with a team of human assistants to handle tasks for busy professionals — via WhatsApp, with no app to install.

Built the full product on Django, React, and TypeScript. Designed and implemented our AI agent ("Any"), which proactively monitored users' inboxes and calendars, detected actionable tasks, and routed them to human assistants with the right context — and nothing more.

Went deep on AI agent architecture: LLM orchestration, tool use, context management, and building reliable AI workflows in production. Also heavily adopted AI-assisted development (Claude Code, context engineering, custom tooling) as a core part of how we worked as a team.

Plazah was a B2B SaaS platform connecting brands with expert networks to improve product recommendations and boost conversion rates. Built using a full TypeScript stack including Next.js, tRPC, Prisma, Node.js, PostgreSQL, and GCP. I also developed a Shopify integration/plugin to connect stores with the platform ecosystem.