Senior Backend Engineer, Comms Core — Remote Spain

Affim is hiring a Senior Software Engineer, Backend (Comms Core) to own and deliver backend services for high-volume, multi-region communications. You will design, implement, and operate reliable systems, collaborating with product, design, analytics, and security teams to balance customer impact and technical constraints. You will lead integrations with external messaging vendors and improve observability, reliability, and on-call readiness while mentoring peers and shaping the architecture. J…