Founding Software Engineer, AI‑Powered Rental Platform

The Flex; Netherlands; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Competitive compensation

Remote-first work environment

Founding-level ownership

Job summary

The Flex is seeking a Founding Software Engineer to help architect and build its future technology. You’ll work directly with the founder, making key architectural decisions and shaping product strategy.

This position allows extraordinary ownership and impact, as you develop systems that automate operations, enhance customer experiences, and integrate with major platforms. Ideal for those looking to influence the core of a growing business while engaging in innovative product development.

Qualifications

• Strong software engineering fundamentals.
• Experience building production‑grade applications.
• Strong understanding of APIs, databases, and system design.
• Product mindset and customer obsession.
• Ability to work independently with minimal supervision.
• Strong problem‑solving ability.
• High level of ownership and accountability.

Responsibilities

• Design, build, and launch the software that powers bookings, pricing, payments, operations.
• Make key technical decisions and define long‑term architecture.
• Develop workflows and systems to automate operations.
• Build AI‑powered tools and workflows that enhance productivity.
• Develop integrations with platforms like Airbnb, Stripe, Twilio.

Skills

Strong software engineering fundamentals

Experience building production‑grade applications

Strong understanding of APIs, databases, and system design

Product mindset and customer obsession

Ability to work independently with minimal supervision

Strong problem‑solving ability

High level of ownership and accountability

Tools

Python

FastAPI

React

TypeScript

Supabase

PostgreSQL

AWS

OpenAI APIs

Stripe

Twilio

Docker

GitHub Actions

Job description

The Flex is seeking a Founding Software Engineer to help architect and build its future technology. You’ll work directly with the founder, making key architectural decisions and shaping product strategy.

This position allows extraordinary ownership and impact, as you develop systems that automate operations, enhance customer experiences, and integrate with major platforms. Ideal for those looking to influence the core of a growing business while engaging in innovative product development.