Founding Software Engineer (FullStack Leaning Frontend)

Salary

salary60,000€ - 80,000

Skills

Location

Languages

Fluent EnglishBasic Spanish

Job Description

We're looking for a driven and experienced Founding Software Engineer to design, build, and operate powerful AI-driven software for high-impact renewable energy projects.

🎯 Responsibilities

  1. Design, develop, and operate an AI-powered document processing pipeline capable of handling millions of documents and terabytes of data daily.
  2. Maintain and manage platform infrastructure with a focus on high availability.
  3. Continuously optimize and automate processes to maximize team efficiency.
  4. Proactively propose and benchmark technical solutions that address customer business challenges.

🛠️ Requirements

  1. Demonstrated experience building scalable software solutions for data-intensive applications.
  2. Ability to assess trade-offs and strike the right balance between best practices, technical debt, and speed of execution.
  3. Strong foundations in software architecture and system design, with practical knowledge of design patterns and anti-patterns.
  4. Genuine passion for combating climate change through clean technology.
  5. Excellent, clear, and structured communication skills with a collaborative approach to problem-solving.

🌟 What Sets This Role Apart

  1. Opportunity to directly accelerate renewable energy financing and make a measurable global impact.
  2. Hands-on growth working alongside experienced founders in AI, energy, and climate tech.
  3. Competitive compensation: €60-80k salary plus a leading equity package.
  4. Hybrid work flexibility with a family-friendly environment.
  5. Flat hierarchy encouraging open communication, rapid decision-making, and real ownership over your projects.

🌱 Our Values

  1. Customer Obsession: Designing solutions that create true user value.
  2. Action and Learning: Moving quickly, experimenting often, and learning through execution.
  3. Ownership: Taking responsibility and initiative beyond defined roles.
  4. Results-Focused: Setting ambitious targets and delivering real outcomes.
  5. Excellence: Holding ourselves and each other to high standards.
  6. Integrity: Acting with respect, trust, open communication, and ethical integrity.

Hiring Process

We want to keep it nice and lean, while making sure both parties get to know each other well enough before we tie the knot! Our hiring process consist in 4 stages which may or may not follow this order:

1. Initial phone screening (30' videocall): Getting to know each other, your goals and constraints around availability, compensation, objectives.

2. Technical take-home challenge (3h, to be completed in 72h): A technical take home challenge that will serve as the basis for the following technical interviews. The take home can be scheduled at a time and date of your convenience and needs to be completed within 72h.

3. Technical interview - take-home discussion (1h30 videocall): A chat with our CTO and an expert software engineer on architecture, system design, design patterns, best practices.

4. Culture & values fit interview with our COO (1h videocall)

5. Final interview with our CEO (45' videocall)

We will strive to move fast and commit to giving feedback as soon as possible.

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TetraxAI

Tetrax is an AI-powered climate-tech startup transforming how clean infrastrcture energy projects are assessed and de-risked. We help energy companies, developers, and investors move faster and safer by automating one of the most complex parts of the industry: due diligence, compliance, and project risk analysis.

Our core product, TetraxVerify, uses artificial intelligence to analyze massive volumes of technical, legal, and commercial project data in minutes instead of weeks—reducing risk, cutting transaction costs, and accelerating the global energy transition.

TetraxVerify supports solar, wind, battery storage, and other clean infrastructure assets, helping teams assess project readiness, identify risks early, and make better investment and development decisions. Our customers include renewable developers, IPPs, investment funds, and advisors across Europe who manage large, multi-country portfolios.

Join our founding team of exceptionally experienced professionals:

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

At Tetrax, you’re not just joining a company. You’re helping build the digital infrastructure behind the global renewable energy transition.

About the team

6

employees

4

nationalities

67%

man

33%

women

Benefits and perks

  • workFromHome

    Work from home

  • flexible

    Flexible schedule

  • food

    Food & drinks

  • stocks

    Stocks options

Location

Plaça de les Glòries Catalanes, Barcelona, Spain