About the Role

We're looking for an Infrastructure Engineer to join our Marketing Engineering team in Prague, focused on building and operating reliable, high-volume email infrastructure and automation systems.

You'll own the systems that power large-scale customer communications - from email delivery platforms and MTA configuration to automation pipelines and cloud infrastructure. This role sits close to production, values reliability above all, and expects someone who automates first and documents as they go.

If you enjoy deep infrastructure work, have strong fundamentals in email systems and Linux, and take pride in keeping complex systems running smoothly at scale, this role is a strong fit.

Key Responsibilities

• Design, configure, and operate Mail Transfer Agents (MTAs) such as Postfix, Sendmail, or Exim, and SMTP infrastructure

• Build and maintain email notification systems used across multiple internal services

• Develop and manage Infrastructure as Code using Terraform and Ansible

• Automate provisioning, configuration, and deployments via CI/CD pipelines (primarily Jenkins)

• Maintain high availability, performance, and security across email and system infrastructure

• Monitor email delivery and system health to consistently meet a 99.5% SLA

• Troubleshoot delivery issues including bounces, blocks, throttling, and sender reputation problems

• Implement and maintain email security standards: SPF, DKIM, DMARC, TLS, and DNS configuration

• Write and maintain clear documentation, runbooks, and operational playbooks

• Share on-call responsibility within the team rotation and support incident response

Key Requirements

• 5+ years of hands-on experience in infrastructure, systems engineering, or DevOps

• Strong experience configuring and operating MTAs and SMTP-based systems

• Solid understanding of SMTP, DNS, TLS, and email deliverability fundamentals

• Practical experience with Ansible and Terraform

• Strong Linux proficiency and shell scripting

• Experience with CI/CD pipelines, especially Jenkins

• Experience troubleshooting email delivery, bounce handling, blocking, and security issues

• Cloud platform experience (AWS, GCP, or Azure), including end-to-end migrations

• Understanding of cloud networking: VPCs, subnets, routing, BYOIP, ARIN IP management, and IP propagation to ISPs

• Proficiency with Git and collaborative development workflows

Nice to Have

• Experience with cloud email services such as KumoMTA, MTA Bird, Amazon SES, SendGrid, or Mailgun

• Exposure to high-volume or large-scale email delivery environments

• Familiarity with monitoring and observability tools: Prometheus, Grafana, or Nagios

What Success Looks Like

• Email infrastructure runs reliably and securely, with a low incident rate and fast resolution times

• Delivery consistently meets SLA and deliverability targets

• Infrastructure is fully automated, well-documented, and operationally straightforward

• Incidents are diagnosed efficiently with clear root-cause analysis and follow-through

• Internal teams rely on the email platform with confidence for critical communications at scale

We Are Interested In

• Engineers who take full ownership of systems and care about long-term reliability, not just uptime

• People who default to automation and treat manual toil as a problem worth solving

• Communicators who can work clearly across engineering and platform teams

• Practical, curious individuals who are comfortable in production environments and move with ownership