Mission Inbox

Mission Inbox is a B2B email infrastructure platform purpose-built for businesses that treat email deliverability as a competitive advantage

Private Company

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BucharestBucharestRomania. Kyiv+10 more locationsContractInfrastructure EngineeringPosted

Senior Systems Engineer - Email Deliverability & Infrastructure

Maintain and configure core MTAs (Postfix, Postal) and IMAP/POP3 servers (Dovecot).
Utilize HAProxy and network routing protocols like BGP to distribute traffic.
Administer PostgreSQL replica setups and block backup/archive servers.
Maintain strict workload isolation across infrastructure nodes.
Enforce SPF, DKIM, DMARC, and BIMI protocols.
Implement MTA-level dynamic throttling to handle deferrals.
Design and guide automated IP/Domain warm-up plans.
Optimize Rspamd and Fail2Ban for outbound spam and connection protection.
Manage log aggregation pipelines using Vector.
Monitor ISP portals and third-party tracking tools.

PostgreSQL

About Mission Inbox

Mission Inbox is a B2B email infrastructure platform purpose-built for businesses that treat email deliverability as a competitive advantage. We operate providing the underlying infrastructure that ensures email reaches the inbox, at scale, reliably. There are currently over 80 million emails going out of our servers and counting. We're early-stage but cash-flow positive (profitable) company which means you get the energy of a startup without the survival anxiety. Every hire has direct leverage on outcomes. The team is fully remote and globally distributed, moves fast, and operates with the execution standards of a company 10x our size.