Senior Systems Engineer
Mission Inbox
WorldwideFully remoteFull TimeSeniorInformation Technology
USD 24,000–36,000 a yearPosted 3 months ago3mo agoApply link checked 4 hours ago
Why we think you can apply
- Hiring model
- Open worldwide · the employer states no country restriction
- Work from
- Anywhere, the UAE included
Posted 3 months ago · apply link checked 4 hours ago
About the role
Responsibilities
- Maintain and configure core MTAs (Postfix, Postal) and IMAP/POP3 servers (Dovecot)
- Utilize HAProxy and network routing protocols like BGP via FRRouting for traffic distribution
- Administer backend infrastructure databases including PostgreSQL replica setups
- Act as technical authority on DNS and authentication protocols including SPF, DKIM, DMARC, and BIMI
- Implement automated MTA-level dynamic throttling to handle 4xx deferrals
- Design and guide automated IP/Domain Warm-up Plans
- Configure and optimize Rspamd for outbound spam filtering
- Deploy automated connection-dropping systems like Fail2Ban to mitigate attacks
- Build and manage high-performance log aggregation pipelines using Vector
- Monitor ISP infrastructure portals including Google Postmaster Tools and Microsoft SNDS
Requirements
- 5+ years of experience as a Linux Systems Administrator, DevOps, or Infrastructure Engineer
- Expert-level proficiency with Postfix, Dovecot, or Postal
- Hands-on experience with Rspamd and Fail2Ban
- Proven experience building log pipelines using Vector or similar frameworks
- Experience with HAProxy, FRRouting, and PostgreSQL replication
- Deep understanding of TCP/IP, routing, ports, and DNS management
- Expert parsing of aggregate DMARC reports
About the Company
Mission Inbox is focused on high-scale email infrastructure and deliverability services.
What we look for
- 5+ years Linux Systems Administration experience
- Expertise in Postfix, Dovecot, or Postal
- Experience with Rspamd and Fail2Ban
- Proficiency with Vector log pipelines
- Knowledge of HAProxy and FRRouting
- Deep understanding of DNS, SPF, DKIM, and DMARC
LinuxPostgreSQLPostfix
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