Founding Software Engineer (Path to CTO)

CroX
Barcelona, Spain
3 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English, Spanish
Experience level
Senior
Compensation
€ 120K

Job location

Remote
Barcelona, Spain

Tech stack

API
Artificial Intelligence
Cloud Computing
Cursor (Graphical User Interface Elements)
Embedded Software
Firmware
Github
LoRaWaN
Software Engineering
Swiftui
iOS
Backend
Build Management
Speech Synthesis

Job description

As Founding Software Engineer, you'll own and ship the entire technical stack and play a central role in shaping the product, the architecture, and the technical direction of the company., * Own the entire technical stack: embedded firmware, cloud backend, and iOS app

  • Take over, iterate, and optimise existing STM32-based firmware
  • Design and build cloud infrastructure from scratch (APIs, data, scalability)
  • Build an iOS app designed for low-literacy, non-technical users (UX, visuals, text-to-speech)
  • Collaborate closely with hardware manufacturing partners
  • Use AI coding tools (Cursor, Claude, GitHub Copilot) as core development partners
  • Travel regularly for hands-on field testing and product launches
  • Ship V1 to market in 2025 and continuously improve reliability and usability

Requirements

Do you have experience in iOS development?, We're looking for a builder - someone excited by ambiguity, ownership, real-world problems, and the opportunity to help build a company from the ground up.

You'll be the sole engineer, working AI-first, shipping a real hardware + software product, and testing it in cattle fields in South America.

If you're looking for a polished corporate environment, a large team, or clearly defined processes from day one, this role is not for you - and that's completely fine., * Strong software engineering fundamentals (language-agnostic)

  • Heavy, demonstrated use of AI coding tools in daily development
  • Experience shipping complete products independently
  • iOS development experience (Swift / SwiftUI)
  • Systems thinking across firmware, backend, and mobile
  • Comfort working autonomously as the sole engineer
  • At least 5+ years of hands-on engineering experience

Nice to Have

  • Embedded / firmware experience (C, STM32)
  • IoT protocols (e.g. LoRaWAN)
  • Cloud backend development (any modern stack)
  • Experience with hardware products
  • Spanish language skills
  • AgTech, robotics, or physical-world product exposure

This Role Is NOT for You If…

  • You need a large team to be productive
  • You're skeptical about AI-assisted development
  • You prefer highly structured corporate environments
  • You're looking for feature-only work without ownership
  • You're uncomfortable with ambiguity, iteration, and field conditions

Who Thrives in This Role

  • Autonomous, resourceful builders
  • Low-ego, high-ownership mindset
  • Comfortable with uncertainty and responsibility
  • Strong product sense and user empathy
  • Excited by real-world, physical impact

Apply for this position