Salary Range: $30k - $60k USD

About Mission Inbox

Mission Inbox empowers businesses to take back control of their email deliverability with an all-in-one infrastructure platform. We move fast, think outside the box, and solve problems with urgency. Our team is made up of founding engineers and driven builders — we set the bar high.

The Role

We need a Systems Architect who is both a builder and a strategist. You won’t just make things fit within current limitations — you will point them out, challenge them, and design ways to remove them. This is about building for scale: we are at 50M emails/month today, but we’re months away from needing to support 600M/month.

This is not a hands-off role. You will design, plan, teach, and execute while working hand-in-hand with our developers and CTO.

Key Responsibilities

• Architect, configure, and optimize email infrastructure:
  • Dovecot (IMAP/POP3 servers)
  • MTAs (Postfix, KumoMTA, Postal, PowerMTA or similar)
  • Full mail server setup, scaling, and hardening
• Collaborate with developers — understand their code, integrate with their workflows, and guide them technically.
• Challenge existing systems, identify limitations, and propose structural changes to eliminate them.
• Build for scale — from 50M → 600M emails/month and beyond.
• Work with the CTO to define long-term infrastructure architecture and lead its execution.
• Mentor engineers, ensuring knowledge transfer and adoption of best practices.
• Take ownership of system reliability, scalability, and performance.

Required Skills & Experience

• Expert-level, hands-on knowledge of:
  • Dovecot setups (configurations, optimizations, advanced deployments).
  • MTAs (Postfix/Exim/etc.).
  • End-to-end email server environments.
• Strong coding background (Python preferred; other languages welcome).
• Ability to collaborate with software engineers and speak their language.
• Proven experience designing and scaling production-level infrastructure.
• Linux systems administration mastery.
• A problem-challenger mindset — not just fitting into limitations but tearing them down to build better.

What Success Looks Like

• Within 2 weeks: You’ve fully onboarded, studied our systems, and are mapping out improvements.
• Within 1 month: You’re delivering measurable impact (resolving infrastructure issues, identifying bottlenecks, proposing scalable solutions).
• Ongoing: You’re the authority for email infrastructure, driving our evolution from tens of millions to hundreds of millions of emails per month.

Culture Fit

• Thrives in fast-paced, high-expectation environments.
• Sees challenges as opportunities to innovate.
• Direct, vocal, and committed — we value bold thinking.
• Treats remote work with full accountability and commitment.