Full-Stack Engineering Lead

Madrid, Spain / Portugal·Full-time·Added 3 months ago

The Flex

6 open roles

What they offer

  • Full-time hours

    Per the ad.

  • Fully remote

    Per the ad.

What they ask for

  • Have the right to work in Spain

    The Flex doesn't mention sponsorship in the ad.

  • Work in English

    English is required, per the ad.

  • Have senior-level experience

    Lead-level role.

This job was published 3 months ago

The role

At The Flex, we believe renting a home should be as effortless as booking a ride.

Our mission is to enable anyone to live anywhere, anytime, without friction.

Powered by Base360.ai, our proprietary technology platform, we are building the operating system for modern renting—automating operations, connecting fragmented systems, and creating seamless experiences for guests, landlords, and operators across the world.

We're looking for a Full-Stack Engineering Lead to help scale both our technology and our engineering culture.

This is a hands-on leadership role. You'll spend the majority of your time building products, solving technical challenges, and architecting systems while also helping guide engineering standards, mentoring team members, and shaping the future of the platform.

If you're excited about ownership, rapid execution, AI, automation, and building products that have real-world impact, we'd love to meet you.

What you'll do

Design, build, and launch high-impact products that improve guest experience, operational efficiency, and business performance.

Make key technical decisions that ensure the platform remains scalable, reliable, and maintainable as the company grows internationally.

Establish engineering best practices, code quality standards, development workflows, and technical documentation.

Provide technical guidance, conduct code reviews, and help create a high-performance engineering culture focused on continuous improvement.

Develop systems that eliminate manual work and allow operations to scale efficiently across multiple markets.

Build and maintain integrations with platforms including Airbnb, Hostaway, Stripe, Twilio, Google, OpenAI, and other strategic partners.

Implement AI-powered workflows, tools, and agents that improve productivity and decision-making across the business.

What You'll Build

As a Full-Stack Engineering Lead, you'll lead the development of Base360.ai, the technology platform powering every aspect of The Flex.

You'll work across product, engineering, AI, and operations to create scalable systems that automate processes, improve decision-making, and accelerate company growth.

You'll be responsible not only for what gets built, but how it's built.

Tech Stack

Our current stack includes:

  • Python

  • FastAPI

  • React

  • TypeScript

  • Supabase

  • PostgreSQL

  • AWS

  • OpenAI APIs

  • Stripe

  • Twilio

  • Docker

  • GitHub Actions

You don't need experience with every technology listed, but you should be comfortable learning quickly and leading technical decisions.

What Success Looks Like

Within your first year:

  • Core systems become more scalable, reliable, and automated

  • Engineering velocity increases significantly

  • Technical debt is reduced without slowing innovation

  • AI-powered workflows are deployed across the business

  • New products are launched rapidly and effectively

  • Base360.ai becomes a major competitive advantage for The Flex

This Role Is Not For You If

  • You prefer large corporate environments with rigid processes

  • You enjoy managing more than building

  • You are uncomfortable making decisions with incomplete information

  • You require detailed instructions for every task

  • You are unwilling to take ownership beyond your immediate responsibilities

If you're excited about leading by example, building world-class software, and helping create the operating system for modern renting, we'd love to hear from you.

#LI-Remote

Requirements

What we're looking for

  • Strong full-stack software engineering experience

  • Experience designing and scaling production systems

  • Strong understanding of APIs, databases, cloud infrastructure, and system architecture

  • Experience leading technical projects from concept to deployment

  • Excellent problem-solving and communication skills

  • Ability to balance speed with engineering quality

  • Strong ownership mentality and bias toward execution

Nice to have

  • Experience leading engineers or technical teams

  • Startup or scale-up experience

  • Experience with AI products or LLM integrations

  • Experience with SaaS, marketplace, travel, or PropTech businesses

  • Experience with FastAPI, React, AWS, or Supabase

Pay & benefits

What you'll get

You'll have direct influence over technology strategy, architecture, and product direction.

Your work will power thousands of stays across multiple countries.

This is a hands-on role where you'll spend your time creating solutions, not sitting in meetings.

Competitive compensation with meaningful upside for exceptional performers.

Work from anywhere. We care about impact, not hours worked.

About The Flex

The Flex is a PropTech company operating in the real estate technology sector, focused on building software solutions for the property industry. The company is at an early stage, operating as a startup with a small, focused team. Their work centers on developing products that address challenges in the real estate market, leveraging technology to improve processes for property professionals.

The Flex has established a presence in Madrid, Spain, where they are actively hiring for their founding team. As a young startup, they offer international professionals the opportunity to join at the ground level, taking on significant ownership and responsibility in shaping the company's product and growth. Their work culture is likely dynamic and fast-paced, typical of early-stage startups, with a strong emphasis on engineering and product development.

Industry
PropTech
Employees
50
Headquarters
Madrid, Spain
In Spain
Madrid

Good to know if you are moving

  • Early-stage startup: joining now means you can have significant impact on the product and company culture.
  • Based in Madrid, Spain, offering a chance to be part of a founding team in the PropTech sector.
  • As a startup, the company may offer equity or other incentives to early employees, common in this stage of company growth.
  • The team is small, so roles are likely to be cross-functional and offer broad responsibility.
  • The company is building software for the real estate industry, a sector with global relevance.

In their own words

About the company & team

Work closely with product, operations, revenue, and leadership teams to translate business challenges into scalable technical solutions.

Work closely with founders and help shape the future of both the platform and the engineering organization.

All open roles at The Flex
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