E-mail Infrastruktúra és Kézbesíthetőségi Mérnök

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) . Originally posted on Himalayas