Job Summary: We are seeking a Senior Systems Operations Developer with strong experience in product operations, messaging infrastructure, Linux administration, Proofpoint, Cloudmark, and SMTP routing. The role will be responsible for maintaining, optimizing, and supporting business-critical messaging platforms while ensuring system reliability, security, availability, and operational excellence. The ideal candidate will bring a combination of systems engineering, application support, troubleshooting, automation, and cross-functional collaboration skills. Key Responsibilities: • Manage and support messaging and email infrastructure in production environments. • Perform day-to-day product operations, including monitoring, incident response, service validation, and operational support. • Administer and troubleshoot Linux-based systems and services. • Configure, maintain, and troubleshoot Proofpoint and Cloudmark messaging and email-security solutions. • Design, implement, and maintain SMTP routing, relays, gateways, connectors, and mail-flow configurations. • Analyze email delivery issues, including bounces, delays, rejections, spam classifications, and routing failures. • Monitor system health, performance, availability, capacity, and message-processing workflows. • Investigate and resolve production incidents using structured root-cause analysis. • Develop scripts and automation to improve operational efficiency and reduce manual processes. • Implement and maintain operational procedures, runbooks, support documentation, and knowledge articles. • Support upgrades, patches, configuration changes, migrations, and production deployments. • Collaborate with engineering, security, network, infrastructure, and support teams to resolve complex issues. • Ensure messaging systems meet security, compliance, availability, and performance requirements. • Participate in on-call rotations and provide timely support for critical production issues. • Identify opportunities to improve monitoring, alerting, reliability, and overall product operations. Required Qualifications: • Several years of experience in systems operations, production support, messaging operations, or systems development. • Strong hands-on experience with Linux operating systems and command-line administration. • Solid understanding of email and messaging technologies, including SMTP, DNS, MX records, SPF, DKIM, DMARC, TLS, certificate management, SMTP authentication, mail queues, delivery status codes, email reputation, and anti-spam controls. • Experience with SMTP routing, mail relays, gateways, connectors, and mail-flow troubleshooting. • Experience supporting Proofpoint and Cloudmark products or comparable messaging-security platforms. • Strong troubleshooting, analytical, and problem-solving skills. • Experience working in production environments with incident, change, and problem-management processes. • Ability to collaborate effectively with engineering, security, network, infrastructure, and support teams. • Strong understanding of system reliability, security, availability, and operational support practices. Preferred Qualifications: • Scripting experience using Shell, Python, or Bash. • Experience with cloud platforms such as AWS, Azure, or GCP. • Familiarity with email security and anti-spam technologies. • Experience working in a 24x7 support environment.