Job Description: Senior Technical Specialist – SMTP Backbone & Unix Infrastructure

Experience

10–15+ Years

Job Summary

We are seeking an experienced Senior Technical Specialist to join our SMTP Backbone Modernization program. The ideal candidate will have extensive expertise in Unix/Linux infrastructure, SMTP relay architecture, email routing, and enterprise messaging platforms. This role involves designing, implementing, maintaining, and modernizing SMTP relay services hosted on Red Hat Enterprise Linux (RHEL), ensuring secure, highly available, and scalable email infrastructure.

The candidate should possess strong knowledge of network technologies, security, automation, certificate management, monitoring, and open-source technologies supporting enterprise email environments.

Key Responsibilities

- Participate in the SMTP Backbone Modernization program, including planning, migration, implementation, and operational support.
- Design, implement, and administer SMTP relay infrastructure on Red Hat Enterprise Linux (RHEL).
- Manage enterprise email routing, SMTP relays, and message flow troubleshooting.
- Configure, maintain, and troubleshoot open-source email solutions such as Sendmail.
- Perform Unix/Linux server administration, including installation, configuration, hardening, patching, and lifecycle management.
- Automate operating system patching, software updates, and certificate renewals using scripting and automation tools.
- Manage SSL/TLS certificates using OpenSSL and ensure secure SMTP communication.
- Troubleshoot network connectivity, firewall policies, DNS resolution, and SMTP-related issues.
- Work closely with network, security, and application teams to resolve infrastructure issues.




- Configure and maintain monitoring solutions for SMTP services, operating systems, and infrastructure components.
- Perform log analysis, system auditing, root cause analysis (RCA), and performance tuning.
- Manage user authentication and directory integrations using LDAP and enterprise directory services.
- Support Privileged Access Management (PAM) solutions and ensure compliance with organizational security policies.
- Develop operational documentation, standard operating procedures (SOPs), and technical knowledge articles.
- Ensure infrastructure complies with enterprise security, governance, and audit requirements.

Required Technical Skills

Messaging & SMTP

- SMTP architecture and protocols
- SMTP Relay administration
- Email routing and mail flow troubleshooting
- Sendmail administration
- Mail queue management
- SMTP security (TLS, SSL)

Unix/Linux Administration

- Red Hat Enterprise Linux (RHEL)
- Linux/Unix system administration
- Shell scripting (Bash)
- System performance tuning
- User and group management
- File system management

Infrastructure & Networking

- TCP/IP
- DNS
- Firewall concepts
- Network troubleshooting
- Load balancing concepts
- High Availability (HA)

Security

- OpenSSL
- SSL/TLS certificate lifecycle management
- Privileged Access Management (PAM)
- Security hardening




- Vulnerability remediation

Open Source Technologies

- Sendmail
- PostgreSQL
- OpenSSL

Directory Services

- LDAP
- Enterprise Directory Services

Automation

- Automated patch management
- Operating system updates
- Certificate renewal automation
- Infrastructure automation using scripting tools

Monitoring & Operations

- Infrastructure monitoring tools
- Log analysis
- System auditing
- Performance monitoring
- Root Cause Analysis (RCA)

Preferred Skills

- Experience in enterprise SMTP backbone modernization or migration projects.
- Knowledge of ITIL processes (Incident, Change, Problem Management).
- Experience with enterprise monitoring platforms (e.g., Nagios, Zabbix, Prometheus, Splunk, SolarWinds).
- Exposure to Ansible or similar automation tools.
- Experience working in large-scale enterprise environments.
- Familiarity with cloud-hosted messaging infrastructure is an advantage.

Soft Skills

- Strong analytical and troubleshooting skills.
- Excellent communication and documentation abilities.
- Ability to work independently and collaboratively across cross-functional teams.
- Strong stakeholder management and coordination skills.
- Ability to manage multiple priorities in a rapid-paced environment.

Education

- Bachelor's degree in Computer Science, Information Technology, Engineering, or a related discipline.

Preferred Certifications

- Red Hat Certified System Administrator (RHCSA) or RHCE
- Linux Foundation Certification
- ITIL Foundation
- Relevant security or networking certifications are desirable

Pay: ₹15,000.00 - ₹25,000.00 per week

Work Location: In person

📌 Senior Technical Specialist – SMTP Backbone & Unix Infrastructure (India)
🏢 Venture Informatrix
📍 India