We're looking for an Email Infrastructure & Deliverability Engineer to own the systems that send email at scale for a fast-growing ecommerce lifecycle marketing platform — covering behavioral tracking, personalization, and email/SMS automation.
In this role, you'll own the entire email sending infrastructure — from queues and scheduling through delivery, feedback processing, and reputation management across a multi-tenant environment.
This is a great opportunity for someone with deep backend infrastructure experience and real email deliverability expertise who enjoys owning critical systems end-to-end, protecting sender reputation at scale, and working autonomously in a small, high-ownership team.
Your responsibilities will include:
- 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, queues, and mailbox providers
- Own your systems end to end, including observability and incident response
What we expect from you:
- 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, domain alignment, and custom sending domains
- 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, spam traps, and customer abuse affect deliverability
- Clear communication and the ability to work autonomously in a small team
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
What we offer:
- Interesting project and technical challenges that support both professional and personal growth.
- A long-term project with stability and impact.
- A flexible, results-oriented schedule with hybrid or remote work options.
- A comfortable, modern office in Kyiv with generator and battery backup.
- Competitive salary, medical insurance, and a supportive onboarding/trial period.
- Team-building events, including parties, online activities, picnics, and more.
- The opportunity to work in a Top Employer company (DOU 2025).
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