The Role

You'll be working directly on the systems that process 15M+ emails monthly for 50+ B2B customers. This isn't about building another email client - you'll be engineering the foundational layer that makes sales emails actually reach inboxes. Think of yourself as both a plumber and an architect: ensuring robust flow while designing systems that scale.

What You'll Build

OBM Engine: Enhance our SendGrid-like API infrastructure designed specifically for cold outreach and sales email
MI Shield Integration: Work with our AI-powered spam filter trained on 41M+ sales emails to block risky emails before they're sent
Dedicated Infrastructure: Optimize and scale our dedicated IP systems that prevent the "shared IP death spiral" plaguing competitors
MI-Workspace Components: Contribute to our evolving ecosystem including DNS management, CRM integrations, and email clients

Our Values in Action

Own It: Take full accountability for email deliverability systems that directly impact customer revenue
Build Solutions: Create infrastructure solutions that don't exist elsewhere in the market
Quality as a Signature: Write code that handles millions of emails with zero tolerance for failure. We encourage AI-assisted development to accelerate your expertise, but you own every line of code that goes into production
Customer ROI in Mind: Every line of code should improve customer email performance and delivery rates

Technical Requirements

5+ years software engineering experience with proven expertise in email infrastructure, SMTP protocols, and mail server management
Deep understanding of email deliverability, reputation management, DNS records (SPF, DKIM, DMARC), and ISP relationships
Experience with high-volume email systems, queue management, and distributed infrastructure
Proficiency in backend technologies and API development (our stack includes modern cloud infrastructure)
Understanding of anti-spam technologies, reputation monitoring, and email authentication protocols
Strong code quality practices with personal accountability for production systems
Bonus: Proficiency with Claude Code and intelligent AI-assisted development - we encourage using AI to accelerate your expertise, not replace your technical judgment

Who Should NOT Apply

Developers looking for typical CRUD app work or frontend-focused roles
Those who view email as "just another messaging protocol" rather than a complex infrastructure challenge
Engineers who rely on AI-generated code without understanding the underlying logic or maintaining code quality standards
"Copy-paste developers" who use AI as a crutch rather than a tool to amplify their existing expertise
Anyone uncomfortable with the regulatory and compliance aspects of email infrastructure
Engineers uncomfortable with individual accountability for code that handles millions of revenue-generating emails
Those seeking a traditional 9-5 with minimal ownership or accountability
Developers who prefer working in isolation rather than directly impacting customer outcomes

Sr Software Engineer

Anywhere in the world

Remote

Senior

Mission Inbox