Senior Backend Python Engineer (Core Gateway)

payabl. empowers businesses to grow through payments innovation and banking services. Our ambition is to expand our strong portfolio of global financial services and make them all accessible through our unified platform, payabl. one. As a licensed financial company with principal membership with card schemes, we specialize in global payments and multi-currency banking solutions. The role is about: We are expanding our engineering capabilities and looking for a Senior Backend Developer to join our Core Gateway team. This is a unique, dual-track role where you will play a central part in both the present and future of our infrastructure. You will support, maintain, and extend our existing Perl-based payment gateway ensuring stability and high performance in a live financial production environment while simultaneously leading the architecting and building of our next-generation Python microservices platform. In this role, you will work in a fast-paced environment where system performance, scalability, and 99.9% reliability are critical to our core transaction flow. Location: Remote from Poland (Contractor arrangement) Reporting to: Technical Lead What you will do: Dual-Track Maintenance: Support and extend the existing Perl-based payment gateway debugging production issues and adding features while the migration is ongoing. Modernization: Design, develop, and maintain modern server-side components in Python, ensuring high performance and scalability. Integrations: Integrate thir