Ingeniero Senior de Pilas Completas, Inteligencia Artificial y Producto

• You have a strong software engineering background, with at least 5 years of experience writing production code across frontend and backend.
• You have experience with AI orchestration frameworks (e.g., LangChain, CrewAI, or building custom agentic logic)
• You have a strong understanding of RAG and optimizing LLM performance through tool-calling and prompt engineering.
• You have experience building high-concurrency backends to support real-time AI interactions and data streaming.
• Advanced written and spoken English (C1)
• You thrive in fast paced, nimble startup environments.
• You have a demonstrable track record of shipping.
• You have an entrepreneurial mindset, whether you’ve created your own products, worked at startups, or have dreams to do so.
• You're hungry for impact and ownership, and you enjoy wearing multiple hats and learning new things.
• You consider yourself a generalist, not tied to any one technology, but excited to tackle new technical challenges.
• You have an appreciation and passion for great design, whether product, brand, or UI.
• You feel confident making decisions amid ambiguity.

MacrosFirst is building the world’s leading nutrition app to help people live healthier lives and achieve fitness goals through a balanced diet. We’re bootstrapped, profitable, and focused on scaling to eight-figure ARR while keeping the team small and nimble.

You’ll join a team of 6 engineers and work closely with the co-founders, design, marketing, and customers to craft features that move the needle for our engaged user base. The project slate centers on an AI-powered Nutrition Copilot, a multi-agent system using LLMs for real-time nutritional coaching, plus ongoing Flutter-based frontend efforts and backend evolution.

• Architect and scale our AI-driven "Nutrition Copilot" – You will lead the development of an intelligent, multi-agent system that utilizes LLMs to provide real-time nutritional coaching. This includes building the conversational UI, implementing a robust Tool Manager for RAG against our food and user databases, and engineering the backend orchestration layer that handles complex tasks. It’s a really fun and ambitious project.
• Flutter development – Ship new features and maintain our existing codebase serving iOS, Android and Web, all written in Flutter and following atomic design with reusable components.
• Backend migration – Steer our migration from FastAPI to golang, starting with building a new backend for a brand new product offering. An exciting blank slate to make your mark.
• Automation – Explore and experiment with AI tools, custom-built internal software, and other automations to amplify the company’s effectiveness.

• You’ve launched your own app, product, or other project.
• You’ve worked on subscription apps before, and words like “RevenueCat”, “paywall test”, and “MMP” mean something to you.
• You have some proficiency in design and feel comfortable tweaking Figma mockups and making design decisions when specs aren’t fully complete.
• You’ve integrated AI effectively into your workflows and are tuned into the latest AI tooling.
• You’ve worked on AI consumer products.