Senior Software Engineer - Fullstack - Founding Team

☀️ Accelerating the Energy Transition, One Algorithm at a Time

TetraxAI is revolutionizing renewable energy infrastructure development, making it 100x faster and 10x cheaper through a cutting-edge B2B SaaS powered by AI.

Join our founding team of exceptionally experienced entrepreneurs :

• Marta : Energy M&A lawyer with +2GW in transactions under her belt
• Arnau : PhD in EECS, architected smart pricing algorithms at WalmartLabs
• Katya : Launched Amazon Flex across 4 countries, scaling operations from scratch

🎯 Your Mission

As a Founding Team member, you'll be responsible for designing, building and operating the software that will enable the processing of millions of documents and terabytes worth of project information every day, helping developers and investors make better decisions in a shorter time.

🔧 Core Responsibilities :

🔍 What We're Looking For

🛣️ The TetraxAI Way

At Tetrax, our culture is built around action, ownership, kindness and relentless focus on creating value for our customers . We’re a small, driven team solving hard problems—so how we work together matters just as much as what we’re building. These principles guide how we make decisions, collaborate, and grow :

Why Join Us?

🌍 Impact : Your code will directly accelerate renewable energy project financing, contributing to global decarbonization efforts

🚀 Growth : Work directly with seasoned founders and gain hands-on experience in AI, energy, and climate tech

💰 Compensation : €60-80k salary + top-of-market equity package.

📍 Flexibility : Hybrid work model in beautiful Barcelona, 2.5-day / week in-person

👩‍👩‍👦‍👦  Family-friendliness : We have children and understand that even though this is a startup, first things come first.

🗾  Flat-hierarchy : we encourage open communication, fast decision-making, and mutual respect. You’ll work directly with the founding team and have real ownership over your projects.