Software Engineer II - Inline Mailflow
Core
Building Abnormal's next-generation SMTP relay infrastructure to power outbound email security and SEG displacement strategies.
Role type
Senior backend software engineer (distributed systems, email infrastructure)
Builds
Scalable mail flow harness, MTA infrastructure, IP management, encryption, and DMARC enforcement services
Domain
Cybersecurity / Email Infrastructure / Distributed Systems
Deliverable
production ML models | product features | infrastructure
Required skills
backend software development, distributed systems design, Go, Python, 0-to-1 build, production service ownership, MTA architecture
Preferred skills
email protocols (SMTP, DNS, SPF/DKIM/DMARC), AWS, Kubernetes, Django, Spark, Prometheus, Docker, email deliverability concepts, Secure Email Gateway experience
Technologies
Go, Python, AWS, Kubernetes, Django, Spark, Prometheus, Docker
Responsibilities
Design and implement core components of the SMTP relay harness including MTA infrastructure and encryption; Co-build the production relay alongside existing infra engineers; Collaborate with PMs and Solutions Architects to translate customer requirements into relay configurations; Own and operate tier-0 mail flow services handling high volumes of enterprise email; Contribute to technical design discussions on relay integration with existing inline products; Raise the bar of engineering excellence by contributing to knowledge sharing and runbooks
Seniority
Mid-Senior, hands-on IC