Sr. Systems Engineer

Join a high-impact infrastructure team supporting the migration of enterprise email security services from on-premises appliances to a cloud-based Proofpoint solution. This role offers the opportunity to help ensure a smooth transition with minimal disruption while working in an onsite environment in the greater DC metro area.
Responsibilities

• Lead the migration from on-premises IronPort email security appliances to a cloud-based Proofpoint email security platform.
• Design, configure, and maintain Proofpoint as an enterprise service.
• Manage Proofpoint firewall rules and maintain block lists.
• Respond to requests to quarantine or release email messages.
• Support messaging security operations with a strong understanding of mail transport architecture and security gateways.
• Work with Linux servers and VMware environments as part of ongoing platform support.
• Collaborate with stakeholders to support a seamless transition and uninterrupted email services.

Skills

• Expert-level experience designing, configuring, and maintaining Proofpoint in an enterprise environment.
• Strong knowledge of email security operations, including firewall rules, block lists, and message quarantine/release processes.
• Deep understanding of MTA and Proofpoint Messaging Security Gateway, including version 8.x.
• Hands-on experience with Linux Server administration.
• Experience supporting VMware-based environments.
• Ability to work onsite and reside within a 50-mile driving radius of the Board offices in the greater DC metro area.
• U.S. citizenship is required.

Preferred Skills

• Experience supporting email security platform migrations in enterprise settings.
• Familiarity with working through background check and drug screen processes upon offer.
• Strong communication and collaboration skills for working with technical and business stakeholders.
• Ability to manage priorities in a fast-moving environment where candidates are reviewed as submitted.

Horizontal is committed to fostering a diverse, equitable, and inclusive workplace where everyone feels respected, supported, and empowered to contribute. We welcome applicants from all backgrounds and experiences who are excited to help deliver secure, reliable technology services.

By applying for this position, you acknowledge and agree that Horizontal Talent may contact you regarding your application using automated technology, including phone calls, SMS/text messages, or email, which may be delivered by our virtual AI recruiter, Alex.

Please apply through this online posting or by visiting our Job Board at Applications will be accepted for 4 weeks. For those that join the team, we offer competitive compensation and benefits including medical, dental, vision, and retirement. Check out all we have to offer and how you can become part of the Horizontal Talent Team. The pay range for this role is $33 - $67 per hour based on qualifications and experience.