Senior Linux Administrator

Minimum Experience:

5 years

Company Description  Neuailes Global specializes in securing and streamlining digital communication in the modern cyber era. The company focuses on protecting both external and internal communications while helping organizations enhance customer acquisition through tools that amplify and manage communication channels. Neuailes Global offers solutions designed to safeguard digital assets and optimize communication efforts end-to-end. The culture emphasizes partnership, reliability, and shared problem-solving to give clients assurance and confidence in their communication security.

Role Description  This is a full-time, on-site Senior Linux Administrator role based in Noida. We're looking for a hands-on infrastructure engineer to own and operate our SaaS platform end to end. You'll manage the full stack — from Linux servers and SMTP/MTA infrastructure to the Node.js services and databases.
This is a deeply technical, ownership-driven role  suited to someone who can identify root causes fast, work directly on production systems, and keep a busy platform stable and performant.

Responsibilities
Operate, monitor, and maintain Linux-based infrastructure in production
Manage SMTP/MTA servers — configuration, routing, queue management, and deliverability
Maintain and extend Node.js services (APIs, tracking, webhooks, queueing)
Administer MySQL/MariaDB — tuning, replication, backups, performance optimization
Manage email authentication and deliverability (SPF, DKIM, DMARC, IP/domain reputation, bounce/feedback handling)
Configure and harden cloud infrastructure (AWS — EC2, load balancers, security groups, DNS, Cloud Watch)
Implement security controls (firewalls, fail2ban, rate limiting, intrusion prevention)
Set up and respond to monitoring and alerting; troubleshoot incidents under pressure
Plan and execute high-availability and scaling improvements with minimal downtime

Required
Minimum 5 years in Linux system administration / infrastructure engineering
Strong Linux system administration (Ubuntu/Debian), shell scripting
Solid Node.js experience — reading, debugging, and modifying production code
Hands-on experience operating SMTP/MTA infrastructure
MySQL/MariaDB administration and query optimization
Networking fundamentals — TCP/IP, TLS/SSL, DNS, firewalls

Preferred

Experience with Haraka/Postfix (or similar SMTP servers) and open-source MTA
Email deliverability expertise (reputation management, ISP relationships, authentication)
AWS infrastructure experience (load balancers, networking, monitoring)

Experience with high-availability database setups (replication, failover)
Security mindset — hardening, log analysis, incident response