Remote Backend Engineer - Email Delivery & Reliability

Lever, Inc.; Ireland; Remote; EUR 132,000 - 150,000; Full time

Benefits offered by this job

Fully remote

Flexible schedules

Team off-sites & conferences

Ownership of infrastructure

Modern tech stack

Job summary

Lever, Inc. is seeking a Backend Engineer to build and operate backend infrastructure for high-volume email delivery, including SMTP delivery, routing, retries, and delivery controls.

This fully remote role offers ownership of critical systems and collaboration with Trust & Safety and Core Sending teams. Ideal candidates have strong backend experience, familiarity with email delivery, and a focus on reliability and observability.

Qualifications

• Extensive backend engineering experience.
• Experience with email/messaging infrastructure or high-volume delivery systems.
• Strong knowledge of queues, workers, retries, idempotency, and backpressure.
• Familiarity with SMTP/MTAs, DNS, and mailbox-provider behavior preferred.
• Reliability, observability, and on-call incident experience.

Responsibilities

• Build and operate email transport and delivery infrastructure.
• Develop SMTP delivery, MTA operations, routing, retries and delivery controls.
• Design throttling across domains, providers, and IPs.
• Improve delivery outcome handling for bounces and deferrals.
• Develop internal tools to investigate delivery issues across customers and routes.
• Participate in incident response and on-call rotations.

Skills

Backend engineering

Email infrastructure

Distributed systems

Ownership

Tools

TypeScript

Go

AWS

PostgreSQL

Datadog

Job description

Lever, Inc. is seeking a Backend Engineer to build and operate backend infrastructure for high-volume email delivery, including SMTP delivery, routing, retries, and delivery controls.

This fully remote role offers ownership of critical systems and collaboration with Trust & Safety and Core Sending teams. Ideal candidates have strong backend experience, familiarity with email delivery, and a focus on reliability and observability.