[Remote] Software Engineer II - Inline Mailflow

Note: The job is a remote job and is open to candidates in USA. Abnormal AI is looking for a Software Engineer to join the newly formed Inline Mailflow team, which is building next-generation SMTP relay infrastructure for outbound email security. The role involves designing and implementing core components of the SMTP relay harness and collaborating with various teams to ensure reliable configurations and high service availability.ResponsibilitiesDesign and implement core components of the SMTP relay harness, including Mail Transfer Agent (MTA) infrastructure, scalability, IP management, encryption, and DMARC support, working from conception through production operationCo-build the production relay alongside existing infra engineers, ramping toward full ownership of defined services as the product matures through Q3 and into EACollaborate with PMs and Solutions Architects to translate customer requirements into reliable, opinionated relay configurations that support inbound and outbound use casesOwn and operate tier-0 mail flow services that handle high volumes of enterprise email at production SLA, participating in on-call rotations and driving continuous reliability improvementsContribute to technical design discussions on how the relay integrates with existing inline products (outbound DLP, behavioral outbound, misdirected email), helping define the architecture of the broader Mail Flow platformRaise the bar of engineering excellence by contributing to knowledge sharing, runbooks, and professional development within the teamSkillsBS degree in Computer Science, Applied Sciences, Information Systems, or a related engineering field3+ years of backend software development experience with distributed systems, designing and building production servicesHands-on experience with our stack: Go and/or PythonExperience building features and components from scratch and owning them in production, balancing feature development with operational workComfortable with ambiguity and 0-to-1 projects where you help shape requirements alongside product and engineering stakeholdersExperience working with distributed teams; proficient in asynchronous and written communicationSolid understanding of email protocols and infrastructure (SMTP, MTA architecture, DNS, SPF/DKIM/DMARC)Experience with our extended stack: AWS, Kubernetes, Django, Spark, PrometheusFamiliarity with email security products or Secure Email Gateways (SEGs) such as Proofpoint, Mimecast, or Microsoft DefenderExperience with email deliverability concepts: IP reputation, bulk sending infrastructure, bounce handling, or feedback loopsFamiliarity with containerization using Docker or similar technologiesCompany OverviewAbnormal AI is the leading AI-native human behavior security platform. It was founded in 2018, and is headquartered in Las Vegas, Nevada, USA, with a workforce of 1001-5000 employees. Its website is https://abnormal.ai/.Company H1B SponsorshipAbnormal AI has a track record of offering H1B sponsorships, with 3 in 2026, 4 in 2025. Please note that this does not guarantee sponsorship for this specific role.