Senior Systems Engineer – Email Deliverability, Infrastructure

🔥 1 hour ago

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Mission Inbox

WebsiteLinkedInAll Job Openings

2 - 10 employees

Founded 2024

☁️ SaaS

🤝 B2B

🔌 API

SaaS • B2B • API

Mission Inbox is an email infrastructure platform that handles delivery, routing, deliverability, and visibility for product, transactional and outbound campaign email. Developers connect via API or SMTP to send transactional and in-app messages while marketing, sales and agencies run high-volume outbound campaigns using isolated sending environments ("Cubes"), dedicated IPs, and risk-detection (MI Shield) to protect sending reputation. The product emphasizes separation of workloads, deliverability controls, webhooks and logs, and integration with CRMs and campaign tools.

📋 Description

• Fully Remote (Global) • Role Overview: We are seeking a highly technical, impact-driven **Senior Systems Engineer** to own, scale, and protect our core email transmission infrastructure. • Core Responsibilities: 1. Infrastructure Management & High Availability; 2. Deliverability Engine & Authentication Protocol Architecture; 3. Edge Security, Anti-Abuse & Incident Response; 4. Observability & Monitoring.

🎯 Requirements

• Systems Engineering Background: 5+ years of experience as a Linux Systems Administrator, DevOps, or Infrastructure Engineer with deep networking knowledge (TCP/IP, routing, ports, DNS management). • MTA Mastery: Expert-level proficiency configuring, debugging, and optimizing enterprise mail tools such as **Postfix**, **Dovecot**, or **Postal**. • Security & Filtering: Hands-on experience writing rules and maintaining mail-filtering/anti-abuse applications like **Rspamd** and **Fail2Ban**. • Observability Pipelines: Proven experience building or maintaining log pipelines using **Vector** or similar high-scale telemetry frameworks. • Infrastructure Automation: Experience implementing network routing layer tools (**HAProxy**, **FRRouting**) and relational databases (**PostgreSQL** replication). • Certificate Management: Strong familiarity with automated SSL/TLS certificate rotation and multi-node compliance monitoring to ensure broken TLS never causes silent drops. • Deliverability & Operational Standards: Deep comprehension of the difference between *Delivery* (server handoff) and *Deliverability* (inbox placement). • Expert parsing of aggregate **DMARC reports** using platforms like DMARCian, Valimail, or Postmark. • Strict commitment to Acceptable Use Policies (AUP): zero tolerance for purchased/scraped lists and a firm grasp on Feedback Loop (FBL) automated triage.

🏖️ Benefits

• This is a highly technical systems engineering role, not a marketing or email campaign management position. • To be considered, you must have hands-on experience configuring Linux mail servers at the command-line level. • Please confirm upon applying that the compensation range of **$40,000 to $62,000 USD per year** aligns with your expectations.