Email Infrastructure & Deliverability Engineer

Stack

Responsibilities

• ▹Build and operate high-throughput email sending services, queues and workers
• ▹Implement retries, backpressure, prioritization, rate limits and adaptive throttling
• ▹Manage shared and dedicated IP pools, domain reputation, warm-up and traffic routing
• ▹Build domain onboarding for SPF, DKIM, DMARC, return-path and tracking domains
• ▹Process bounces, complaints, unsubscribes, suppressions and ISP feedback loops
• ▹Monitor throughput, queue latency, deferrals, bounce rates, complaints and reputation signals
• ▹Create automated guardrails that throttle, pause, reroute or block unsafe sending
• ▹Diagnose production issues across SMTP, DNS, providers and queues
• ▹Own systems end to end, including observability and incident response

Requirements

• ▹Strong backend or infrastructure engineering experience
• ▹Production experience building or operating high-volume email systems, ideally at an ESP or marketing automation platform
• ▹Deep knowledge of SMTP, bounces, complaints, deferrals, throttling and mailbox-provider behavior
• ▹Hands-on experience managing sender reputation across domains and IP pools
• ▹Strong knowledge of SPF, DKIM, DMARC, DNS and domain alignment
• ▹Experience with queues, distributed workers, idempotency, rate limiting, SQL and Redis
• ▹Ability to diagnose blocklists, spam complaints, authentication failures and reputation changes
• ▹Understanding of how list quality, engagement and spam traps affect deliverability

Nice to have

• ▹Experience at an ESP such as Klaviyo, Mailchimp, Braze, Iterable, SendGrid, Mailgun or Customer.io
• ▹Experience with Amazon SES or MTAs such as Postfix, Haraka or PowerMTA
• ▹Familiarity with Google Postmaster Tools, Microsoft SNDS/JMRP, feedback loops and blocklist monitoring
• ▹Experience with Go, Node.js/TypeScript, Kafka, Pub/Sub, Kubernetes or Prometheus
• ▹Experience using AI coding tools such as Claude Code or Codex

Soft skills

What we offer

• ▹Interesting project and technical challenges
• ▹A long-term project with stability and impact
• ▹Flexible, results-oriented schedule with hybrid or remote work options
• ▹Comfortable, modern office in Kyiv with generator and battery backup
• ▹Competitive salary, medical insurance and a supportive onboarding/trial period
• ▹Team-building events
• ▹The opportunity to work in a Top Employer company (DOU 2025)

About the company

Empat provides an ecommerce lifecycle marketing platform covering behavioral tracking, personalization and email/SMS automation.