We are looking for a CTO / Head of Engineering to help us scale sun.store into one of the leading AI-native B2B marketplaces in the world.

About Sun.store

sun.store is the biggest B2B marketplace for solar and energy storage components in Europe. We have recently been recognized by Sifted as #1 fastest-growing startup in Europe in their annual Future 50 ranking.

Launched In October 2023, We Already

• process €100m+ GMV annually
• are truly pan-European, with 90% transactions crossing borders
• serve 45,000+ B2B users
• are backed by leading VC investors
  
  

We are building toward becoming the dominant platform in the solar and storage components space, with expansion into adjacent verticals in the plans.

What We Are Building

We are building a suite of internal and external tools around:

• AI agents
• operational automation
• pricing intelligence
• logistics orchestration
• sales enablement
• merchant tooling
• AI-assisted workflows for teams and customers
  
  

We Are Looking For Someone Excited About

• scaling agentic AI systems in production
• rapid experimentation
• AI-native product development
• leveraging modern vibe-coding / AI-assisted development workflows
• building software in very close cooperation with business teams
  
  

This is not a “keep the servers running” CTO role. This is a high-ownership builder role.

Current team & stack

Current Tech Team

• 3 developers
• 2 ML engineers
  
  

Current Platform

• fully custom-built
• primarily PHP-based today
  
  

Future Architecture

• open for discussion
• including potential migration toward a more Python-native and AI/ML-oriented ecosystem
  
  

We care much more about speed, architecture quality, product thinking and execution than attachment to any specific stack.

What We Are Looking For

We are looking for someone who is:

• highly energetic and hands-on
• deeply curious about AI agents and ML
• excited by scaling real businesses, not just writing code
• comfortable making product and business decisions
• capable of leading engineering while staying close to execution
• pragmatic and fast-moving
  
  

Ideal Background

• startup / scaleup environment
• experience with marketplaces, operational systems or AI tooling
• strong software engineering fundamentals
• ML / AI exposure is a major plus
• experience managing and growing engineering teams
  
  

What You Get

• very high level of ownership and autonomy
• direct influence on business strategy and product direction
• close cooperation with founders and leadership
• ability to shape the future architecture of the company
  
  

Compensation

• Attractive package, with ESOP included
  
  

Location

• flexible / hybrid preferred
  
  

If you are excited about the idea of combining AI agents, marketplaces, operational tooling and real-world business scale - we should talk!