The Flex Tech Stack

Flexible short-term apartment rentals powered by event-driven automation

Real Estate LONDON, London 51–200 employees Founded 2019 Privately Held

The Flex operates a marketplace for furnished apartments with flexible lease terms, built on a heavily automated backend—Node.js, Python, FastAPI, and AWS serverless primitives (Lambda, DynamoDB, EventBridge, SQS). The engineering-dominant hiring mix (705 engineering roles across 1020 open positions) and active adoption of Stripe, Hostaway, and Twilio suggest infrastructure-first scaling priorities, with a particular focus on eliminating operational friction through event-driven automation and third-party integrations.

Tech Stack 34 technologies

Core StackTrello Asana Slack HubSpot Salesforce Node.js TypeScript Python FastAPI React AWS Stripe Twilio AWS Lambda DynamoDB Meta Ads Google Ads Microsoft Office Google Workspace Zoho CRM Hostaway EventBridge AWS SQS AWS EventBridge TikTok Ads Google Analytics 4 Webflow Hotjar TikTok Ads Manager+4 more

AdoptingStripe Twilio Python FastAPI Hostaway

What The Flex Is Building

◆Challenges

Removing friction from guest and operator journeys
Replacing manual tasks across the business
Improving conversion rates
Pricing intelligence
Replacing manual operations
Fragmented manual processes
Operational chaos
Processing millions of real-time events
Replacing manual processes with automation
Operational and technical issues

▲Active Projects

Deep integrations with airbnb, stripe, hostaway, twilio
Automation workflows
Initial architecture powering bookings, payments, availability, and guest experience
Event-driven services and automated workflows
Serverless infrastructure on aws
Automation pipelines
Initial architecture powering bookings and payments
Integration with third-party services
Event-driven automation services
Build high-performing acquisition funnels for bookings and leads

Hiring Activity

Steady1,000 roles · 420 in 30d

Department

Engineering

705

Support

161

Marketing

Ops

Product

Operations

Legal

Seniority

Mid

473

Senior

400

Lead

Manager

Junior

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About The Flex

The Flex is a UK-based rental platform offering furnished apartments on flexible terms, founded in 2019 and headquartered in London. The company operates a two-sided marketplace connecting landlords and renters, positioning itself as an alternative to traditional property management. The product spans bookings, payments, availability, and guest experience layers, with deep integrations into popular property management and payment ecosystems. Hiring is distributed across 24+ countries, with the largest concentration in engineering and customer support roles.

HeadquartersLONDON, London

Company Size51–200 employees

Founded2019

Hiring MarketsUnited Kingdom, Indonesia, Malaysia, Chile, Moldova, Andorra, Nigeria, Senegal

Frequently Asked Questions

What tech stack does The Flex use?

Core stack: Node.js, TypeScript, Python, FastAPI, React frontend, AWS (Lambda, DynamoDB, EventBridge, SQS). Payment processing via Stripe; messaging via Twilio. Property management integrations with Hostaway and Airbnb.

What is The Flex working on?

Event-driven automation, serverless infrastructure, and third-party service integrations (Airbnb, Stripe, Hostaway, Twilio). Active projects: booking and payment architecture, automated workflows, high-performing acquisition funnels, and real-time event processing at scale.