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# Routing L3 Support Engineer - Linux

- **Company:** Randstad
- **Location:** Pennington, NJ, United States
- **Experience:** Expert
- **Salary:** $116,480.0 - $137,280.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Antivirus Softwares, Bash Shell, Unix, Configuration Management, Information Leak Prevention, Linux, Domainkeys Identified Mail, Domain-Based Message Authentication Reporting and Conformance (DMARC), Email Filtering, Perl (Programming Language), Monitoring of Systems, Python (Programming Language), Korn Shell, Log Analysis, Simple Mail Transfer Protocols, Enterprise Messaging Systems, Windows Servers, Nagios, Routing, Windows PowerShell, Red Hat Enterprise Linux, Sendmail, Shell Script, Systems Architecture, Scripting, System Availability, Malware, Postfix, Sender Policy Framework (SPF), Operational Systems, Splunk
- **Published:** September 25, 2026
- **Apply:** https://www.dice.com/job-detail/4ed77261-6f53-40bc-a4f9-dc42e46c55b7

## About the Role

* Experience level: Experienced
 * Minimum 5 years of experience
 * Education: Bachelors (required)

skills:

Antivirus,Bash,configuration management,Anti-Spam,messaging technologies,messaging systems,Data Loss Prevention,Korn Shell,Linux/UNIX,Linux,log analysis,Malware,Windows,service monitoring,monitoring tools,monitoring and observability tools,Nagios,Operations System,Perl,Python,enterprise Linux,scripting,Shell scripting,SMTP,Splunk,system availability,UNIX,Windows Server,analytical,Excellent written and verbal communication,communicate effectively,organizational skills,committed,problem resolution,troubleshoot,Troubleshooting,problem-solving capabilities,reliability,proactively,Ability to work independently,proactive approach,Collaboration,24x7,System Administration,administration,Architecture,Install,automation,continuous improvement,business needs,Change Management,construction,corrective and preventive actions,Diagnose,email processing,email security,Engineering Support,incident management,Problem Management,incident response,ITIL processes,infrastructure,Infrastructure
Support,infrastructure knowledge,hygiene,maintenance,system maintenance,optimization recommendations,operating systems,operational support,production support,root cause investigations,security,service improvement,enterprise collaboration,system design,resolve technical issues,testing,user requirements,Windows-based systems,Windows environments

## Description

We are hiring a Level 3 Email Routing Support Engineer to join our core Linux-based email infrastructure team. As senior members of our established team prepare for retirement, we are seeking a strong technical lead who can maintain operational continuity (BAU) for our legacy environment while helping drive modernizations for our messaging architecture.

This position is structured with a direct path toward FTE conversion, making it ideal for an experienced engineer seeking a long-term home.

PRIMARY RESPONSIBILITIES

L3 Incident Resolution & Support (BAU): Serve as the final escalation point for complex email delivery failures, mail flow deferrals, and routing misconfigurations.

MTA & Gateway Administration: Maintain and tune Proofpoint secure email gateways, alongside Sendmail and Postfix mail transfer agents running on Linux.

Legacy Application Support: Troubleshoot legacy Windows Server email routing configurations and application-generated mail flow to ensure seamless relaying to our Linux core.

Modernization & Automation: Identify opportunities to upgrade legacy Sendmail/Postfix rules, implement modern authentication standards (SPF, DKIM, DMARC), and automate queue monitoring via Bash, Python, or PowerShell.

Knowledge Transfer & Succession: Work closely with retiring senior engineers to document legacy system architectures, custom routing maps, and standard operating procedures., Messaging Infrastructure Support

? Provide day-to-day operational support for enterprise email and collaboration infrastructure.

? Install, configure, maintain, and troubleshoot messaging applications and supporting

technologies.

? Ensure availability, reliability, and performance of messaging systems in accordance with

established SLAs.

? Support SMTP email processing, mail routing, delivery, and message hygiene services.