Full-Stack Product Engineer

JobsCloseBy Editorial Insights

The Flex is hiring a Full-Stack Product Engineer in Beijing, hybrid, to help build the operating system for modern renting powered by Base360.ai. You’ll own ideas from concept to production, design solutions with founders and ops, ship fast, automate workflows, build tools and features, and connect external platforms like Airbnb, Stripe, Twilio, and OpenAI. The role demands strong full-stack experience, production-grade apps, solid API and database skills, a product mindset, independence, and clear written communication; nice-to-haves include FastAPI, React/TypeScript, AI integrations, startup or PropTech experience. To apply, tailor materials to show end-to-end impact, automation, and cross-functional collaboration, and explain why The Flex excites you.

At The Flex, we believe renting a home should be as simple 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 systems, and creating seamless experiences for guests, landlords, and operators worldwide.

We're looking for a Full-Stack Product Engineer who thrives at the intersection of product, engineering, and execution.

This isn't a role where you'll simply implement tickets.

You'll identify problems, design solutions, build products, automate workflows, and help shape the future of the platform.

What You'll Do

Build Products End-to-End

Take ideas from concept to production by designing, building, testing, and launching features that create measurable business impact.

Own Customer Problems

Work directly with founders and operational teams to understand challenges and transform them into elegant software solutions.

Move Fast

Ship quickly, gather feedback, iterate, and continuously improve products based on real-world usage.

Create Automation

Design systems that eliminate manual work and allow the company to scale efficiently.

Build Internal Tools

Develop operational dashboards, workflow engines, management platforms, and AI-powered tools used across the business.

Connect External Systems

Build integrations with platforms such as Airbnb, Stripe, Hostaway, Twilio, Google, and OpenAI.

Leverage AI

Implement AI-powered features and workflows that improve productivity, decision-making, and customer experience.

Scale the Platform

Ensure systems remain reliable, secure, and scalable as the business grows internationally.

Tech Stack

Current technologies include:

• Python

• FastAPI

• React

• TypeScript

• Supabase

• PostgreSQL

• AWS

• OpenAI APIs

• Stripe

• Twilio

• GitHub Actions

You don't need experience with every technology listed above, but you should be capable of learning quickly and adapting.

What We're Looking For

Must-Have

• Strong full-stack development experience

• Experience building production-grade web applications

• Strong understanding of APIs and databases

• Product mindset and user-centric thinking

• Ability to work independently and take ownership

• Strong problem-solving skills

• Excellent written communication

Nice-to-Have

• Experience with FastAPI

• Experience with React and TypeScript

• Experience with AI tools or LLM integrations

• Startup experience

• PropTech, marketplace, or SaaS experience
  

What Success Looks Like

Within your first year:

• You've launched multiple high-impact features

• Manual operational processes have been automated

• Product development cycles are significantly faster

• AI-powered workflows have been deployed across the business

• Base360.ai has become a stronger competitive advantage for The Flex
  

Why Join The Flex

Massive Ownership

You'll have direct influence over product decisions, architecture, and company strategy.

Build Real Products

Your work will impact thousands of users and properties across multiple countries.

Learn at Startup Speed

You'll work closely with founders and gain exposure to engineering, product, operations, AI, and business.

Remote-First

Work from anywhere.

High Growth Environment

We're building quickly and looking for people who want to grow alongside the company.

This Role Is Not For You If

• You prefer highly structured corporate environments

• You only want to write code from predefined specifications

• You avoid ownership outside your immediate responsibilities

• You are uncomfortable moving quickly and adapting to change
  

If you love building products, solving real-world problems, and creating systems that scale, we'd love to hear from you.

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