Senior Base44 Backend & Integrations Engineer (Marketplace) or Marketplace Architect + Base44 Expert

**Job Title: Senior Backend Engineer + Base44 or Marketplace Architect + Base44 Expert** **Job Description:** Join our team as a Senior Backend Engineer to enhance our marketplace platform. You'll work on integrating new features, optimizing performance, and ensuring scalability. Collaborate with our team to design and implement backend solutions that meet user needs. This role requires strong problem-solving skills and the ability to work independently. About the Project We are building EG marketplace in Europe. Our goal is to build a scalable, secure, and production-ready platform with a strong focus on merchant onboarding, payments, and long-term architecture. We are looking for a highly experienced engineer who can take ownership of the backend architecture and critical integrations within Base44. To be considered, please start your proposal with the words "EG Backend" and answer the following questions: How many production Base44 applications have you personally built? Please provide links or demos. Have you implemented marketplace payment flows? Have you implemented split payments or commission logic? Have you integrated invoice/factura APIs? What would be the biggest technical challenge in building a marketplace like EG in Base44?