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Senior Full-Stack Engineer (Email Automation Platform) Remote | Full-Time Location: Remote Employment Type: Full-Time Experience: 5+ Years Build the Future of Cold Email Infrastructure A t Mailin. ai, we're building the next generation of email infrastructure and outbound automation. Our platform powers high-volume outbound campaigns for businesses that rely on reliable, scalable email delivery. We're looking for a Senior Full-Stack Engineer who can take ownership of building a production-grade email sequencing platform comparable to Instantly, Smartlead, Apollo, or Lemlistdesigned for scale, reliability, and exceptional user experience. This isn't a maintenance role. You'll architect, build, and ship core platform capabilities that send millions of emails while maintaining industry-leading deliverability. What You'll Build You'll own major parts of our outbound automation platform, including: Email Campaign Engine - Multi-step email sequences - Campaign scheduling and business hours - Smart follow-up automation - Conditional branching based on opens, replies, clicks, bounces, and custom events - Campaign throttling and rate limiting - Queue-based email processing Lead & Contact Management - CSV and API imports - Lead segmentation and tagging - Custom fields and dynamic variables - Duplicate detection - Personalization engine Sending Infrastructure - SMTP, Gmail OAuth, Microsoft 365 OAuth - Multiple mailbox management - Automatic mailbox rotation - Domain-aware sending - Queue management and retry systems - High-volume email delivery optimization Unified Inbox - Conversation threading - Reply detection - Team collaboration - Search, filters, and labels - Inbox workflow management Deliverability Platform - Mailbox health monitoring - Bounce tracking - Reputation analytics - Domain health dashboards - Warm-up integrations - Sending optimization AI & Personalization - AI-powered email generation - Subject line generation - Energetic personalization - Tem .
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The employers posting the most developer roles are Link Group (369 jobs), Upvanta (257), jobgether (226), and OfferZen (212). If you're applying to any of these, research their hiring patterns. They move fast and post often, which means they're either scaling hard or replacing people who didn't fit.
In your interview, expect this: 'Walk me through the last time you had to debug something that took you more than an hour. What was it, what did you try first, and what would you do differently?' Hiring managers ask this to see if you think systematically or just try random fixes. Have a real example ready with specifics.