Weekday (YC W21)

Senior Network Engineer

Weekday (YC W21)

full-time

Posted on:

Location Type: Remote

Location: New York • United States

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Job Level

Senior

Tech Stack

CloudDNSFirewallsSMTPTCP/IP

About the role

  • Monitor, analyze, and troubleshoot bounced emails and email delivery failures across enterprise systems.
  • Investigate SMTP errors, soft bounces, hard bounces, and delivery delays to identify root causes.
  • Work with network and infrastructure teams to diagnose issues related to DNS, routing, firewall rules, and mail server configurations.
  • Maintain and optimize email infrastructure including SMTP servers, gateways, and relay systems.
  • Analyze server logs, bounce messages, and delivery reports to resolve technical issues affecting email performance.
  • Configure and manage authentication and security mechanisms such as SPF, DKIM, and DMARC.
  • Collaborate with product and engineering teams to improve email deliverability and system reliability.
  • Monitor network performance and ensure optimal configuration for high-volume email systems.
  • Implement preventive measures to reduce bounce rates and ensure successful email transmission.
  • Document troubleshooting steps, root cause analyses, and solutions for recurring issues.

Requirements

  • Strong understanding of email protocols including SMTP, POP3, and IMAP.
  • Experience analyzing email bounce logs, SMTP response codes, and delivery status notifications (DSN).
  • Knowledge of DNS configuration, MX records, reverse DNS, and email authentication standards (SPF, DKIM, DMARC).
  • Familiarity with mail servers such as Postfix, Sendmail, Exim, Microsoft Exchange, or cloud-based email services.
  • Solid networking knowledge including TCP/IP, firewalls, routing, and load balancing.
  • Experience troubleshooting issues related to email deliverability, spam filtering, and blacklisting.
  • Ability to analyze logs, identify patterns, and resolve complex technical issues.
  • Strong problem-solving skills with attention to detail.
  • Excellent documentation and communication skills.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
SMTPPOP3IMAPDNS configurationMX recordsSPFDKIMDMARCPostfixMicrosoft Exchange
Soft Skills
problem-solvingattention to detaildocumentationcommunication