Software Engineer II, Message Mailflow

About the Role

Abnormal AI is seeking a Software Engineer to join the Message Mailflow team. The Message Mailflow team is responsible for building and maintaining stable, efficient, and hands-off systems that power the ingestion of billions of emails per day. Our systems are the backbone of Abnormal's core Inbound Email Security product—handling everything from upstream mailbox monitoring and email notifications to downstream remediation actions on malicious messages.

The Message Mailflow team develops and manages tier 0 backend services that are mission-critical to Abnormal's success, including but not limited to Subscription Manager (which mailboxes we monitor), Notification Producer (processing new email notifications from providers), and Remediation (executing actions on malicious messages). This is a backend and systems-heavy team, and the ideal candidate will have experience working with distributed systems at scale and a passion for operational excellence.

The ideal candidate has strong backend and distributed systems experience, a deep appreciation for email infrastructure, and the ability to thrive in a fast-moving 0-to-1 build environment.

What You Will Do

• Design & execute software projects that are critical to Abnormal's core product, working with a team of engineers through conception, design, implementation, launch, and operation


• Own and improve the stability, performance, and scalability of tier 0 backend services that process billions of emails daily


• Collaborate with teams across R&D including Detection, Products, and Infrastructure to ensure Message Mailflow services meet the needs of the broader organization


• Participate in oncall rotations to maintain the reliability and uptime of mission-critical systems


• Drive continuous improvement by identifying opportunities to enhance system efficiency, reduce operational overhead, and increase reliability


• Raise the bar of engineering excellence, actively contributing to knowledge sharing within the team and participating in professional development activities

Must Haves

• BS degree in Computer Science, Applied Sciences, Information Systems or other related engineering field


• 3+ years of industry experience on backend software development & distributed systems, designing & building software applications


• Experience with our stack: Go and/or Python


• Experience working with distributed teams, proficient in asynchronous and written communication


• Experience building features & components from scratch and operating them, balancing feature development work with operational tasks


• Open to following pre-established guidelines, coding practices, and conventions


• You’re growth-driven & looking to increase impact & responsibility over time

Nice to Have

• Experience with our stack: AWS, K8, Django, Spark, Prometheus


• Familiarity with AWS services and deployment practices.


• Knowledge of containerization using Docker or similar technologies.

#LI-PP1