Senior Backend Engineer, Comms Core — Remote Spain

Affim is seeking a Senior Software Engineer, Backend (Comms Core) to own and deliver backend capabilities for a high-volume communications platform. You will design multi-region, multi-tenant services, collaborate with cross-functional teams, and drive reliability, performance, and scalability across complex messaging workflows. Based in Spain with remote-first flexibility, you will contribute to architectural decisions, integrations with external vendors, and on-call reliability while growing …