Key skills
Red Hat Enterprise LinuxM365 collaboration stackPostfix SMTP configurationEmail security standardsAutomation toolsScripting skillsLoad balancing knowledgeSystem monitoring toolsDNSTCP/IPRed Hat certificationsCommunication skillsPythonBashPowerShellAnsibleNGINXLDAPGrafanaLoad BalancingCollaboration
About this role
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. The Senior Collaboration Engineer will manage and maintain Red Hat Enterprise Linux servers and M365 collaboration services, enhancing the mail flow environment and ensuring high availability through load balancing and system hardening.
Responsibilities:
- Implement and monitor SPF, DKIM, and DMARC policies
- Troubleshoot email delivery issues and enforce anti-spoofing measures
- Full lifecycle management of our Red Hat servers, including installation, configuration and patching in production and test environments
- Perform security patching, upgrades, and hardening to meet compliance standards and remediate critical vulnerabilities
- Configure and maintain Postfix SMTP servers for enterprise email flow
- Integrate email services with DNS, LDAP, and TLS for secure delivery
- Knowledge of load balancers and DNS for email services
- Support failover and disaster recovery strategies
- Use tools like Grafana, Nagios, Zabbix, or similar for system and service monitoring
- Analyze logs and resolve complex SMTP and network issues
- Automate routine tasks using Bash, Python, PowerShell, and configuration management tools (Ansible, Puppet)
- Maintain accurate documentation of configurations and processes
- Deliver, support, and enhance M365 services in Exchange Online, Exchange Online Protection, retention policies, litigation holds, etc
- Introduce new and modify existing M365 mail flow features and services across NASA and support customer issues
Requirements:
- Must be a US citizen to apply
- Must be able to obtain a Public Trust or currently possess a security clearance to be considered
- Bachelor's degree in Computer Science, Information Technology, or equivalent experience
- 8-12 years of relevant experience
- Experience with SMTP management including configuration, security, and troubleshooting
- Hands-on experience in command-line Linux system administration
- Experience as service owner within an enterprise or GCC M365 environment
- Advanced proficiency in Red Hat Enterprise Linux (RHEL 8/9) Bash administration
- Advanced proficiency in Hybrid Exchange and the M365 collaboration stack
- Expertise in Postfix SMTP configuration, troubleshooting, and mailflow
- Expertise in SPF, DKIM, DMARC implementation, troubleshooting, and monitoring
- Familiarity with load balancers (NGINX, HAProxy) and reverse proxy setups
- Solid understanding of DNS, TCP/IP, LDAP, and secure email transport (TLS/SSL)
- Scripting skills in Bash or Python and PowerShell
- Experience with automation tools (Ansible, Puppet)
- Knowledge of system monitoring tools and performance tuning
- Red Hat certifications (RHCSA, RHCE) strongly preferred