Senior Software Engineer

The Flex
Paris, Milan, Belfast, Tunis, Bali, Cairo, San Marino, Algiers, Port Louis, Oslo, Tirana, Lisbon, Astana, Belgrade, Podgorica, Bandar Seri Begawan, Hanoi, Rabat, Muscat, Victoria, Budapest, Ljubljana, Casablanca, Warsaw, Taipei, Riga, Manila, Dublin, Vienna, Abidjan, Beijing, Sofia, Bangkok, Helsinki, Kinshasa, Lima, Athens, Leeds, Addis Ababa, Yerevan, Reykjavik, Jakarta, Copenhagen, Valletta, Chisinau, Kuala Lumpur, Liverpool, London, Brussels, Vilnius, Yaoundé, Antananarivo, Luxembourg, Nicosia, Istanbul, Tbilisi, Bratislava, Berlin, Porto-Novo, Amsterdam, Amman, Manchester, Andorra la Vella, South Africa, Tokyo, Madrid, Doha, Benin, Azerbaijan, Baku
Workplace: RemoteFull timeFunction: Software EngineeringSkills: ["Problem-solving","Product mindset","Independent work","Technical judgment","Ownership"]

Build and scale an AI operating system for short-term rental operators, delivering customer-facing products, automation engines, and AI-powered workflows across the full rental lifecycle. You’ll design API-first systems, integrate key partners (Airbnb, Hostaway, Stripe, Twilio, OpenAI, Google), and deploy cloud-native infrastructure. Own projects end-to-end—from architecture and implementation to deployment and reliability—bringing senior engineering judgment to complex operational problems.

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The Flex
The Flex
1 day ago

Senior Software Engineer

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Last checked: 3 hours agoStatus: Live

Job Summary

Build and scale an AI operating system for short-term rental operators, delivering customer-facing products, automation engines, and AI-powered workflows across the full rental lifecycle. You’ll design API-first systems, integrate key partners (Airbnb, Hostaway, Stripe, Twilio, OpenAI, Google), and deploy cloud-native infrastructure. Own projects end-to-end—from architecture and implementation to deployment and reliability—bringing senior engineering judgment to complex operational problems.
Location: Paris, Milan, Belfast, Tunis, Bali, Cairo, San Marino, Algiers, Port Louis, Oslo, Tirana, Lisbon, Astana, Belgrade, Podgorica, Bandar Seri Begawan, Hanoi, Rabat, Muscat, Victoria, Budapest, Ljubljana, Casablanca, Warsaw, Taipei, Riga, Manila, Dublin, Vienna, Abidjan, Beijing, Sofia, Bangkok, Helsinki, Kinshasa, Lima, Athens, Leeds, Addis Ababa, Yerevan, Reykjavik, Jakarta, Copenhagen, Valletta, Chisinau, Kuala Lumpur, Liverpool, London, Brussels, Vilnius, Yaoundé, Antananarivo, Luxembourg, Nicosia, Istanbul, Tbilisi, Bratislava, Berlin, Porto-Novo, Amsterdam, Amman, Manchester, Andorra la Vella, South Africa, Tokyo, Madrid, Doha, Benin, Azerbaijan, Baku
Workplace: Remote
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Architect and scale the platform that powers reservations, availability, pricing, payments, guest experiences, and property operations.
  • •Build event-driven automation workflows that eliminate repetitive work across the rental lifecycle.
  • •Develop AI-powered systems using LLMs and AI agents for communication, triage, and pricing decisions.
  • •Create robust API-first integrations connecting internal services, booking channels, and third-party providers.
  • •Own projects end-to-end, including delivery, code reviews, deployment, and ongoing reliability improvements.

Key Requirements

  • •Strong experience building and owning production-grade software systems.
  • •Experience with FastAPI, Python, React, or similar frameworks.
  • •Strong understanding of APIs, distributed systems, and cloud architecture.
  • •Experience designing scalable backend systems and reliable data models.
  • •Ability to work independently and make sound technical decisions.
Experience:Short-term rentalsHospitality technologyProperty managementMulti-tenant SaaSMarketplacesAI agentsEvent-driven architectures
Skills:Problem-solvingProduct mindsetIndependent workTechnical judgmentOwnership
Tech Stack:PythonFastAPIReactTypeScriptSupabasePostgreSQLAWSServerless architectureOpenAI APIsTwilioStripeDockerGitHub ActionsLLMsAI agentsAPIsDistributed systemsCloud-native infrastructure

Company Brief

The Flex
The Flex designs and sells adjustable, stretch-fit caps and casual headwear focused on comfort and modern styling. They offer fitted and flex-fit hats alongside casual apparel and accessories for everyday and sportswear use.
Industry: Fashion & Apparel
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