Backend Engineer (Email Systems, REMOTE)

• Up to €5,200 per month
• 100% Remote 
• Full-time
• B2B Contract

We’re hiring a Backend Engineer focused on outbound email infrastructure who enjoys building fast, reliable systems and pays close attention to how email infrastructure and deliverability work.

Our client is a Portugal based company whose platform is built to simplify the process of launching effective cold calls and email campaigns, making outreach more efficient and results-driven. 

Requirements:

• Strong knowledge of email systems and protocols such as SMTP, SPF, DKIM, DMARC, as well as DNS and mail routing
• 4+ years working in backend development, infrastructure engineering, or building system-level software
• Skilled in backend programming languages like Node.js, Go, Python, etc., with experience building on container-based or cloud-native platforms (like Docker, AWS, Kubernetes)
• Hands-on experience growing and managing email infrastructure like Mailgun, Postmark, etc.  — whether through third-party providers or custom-built setups
• Familiar with managing background task systems and message queues (e.g. Kafka, Redis Queue, or RabbitMQ) along with handling concurrency and throttling
• Comfortable using tools for tracking logs, system health, and performance alerts (such as Prometheus, Sentry, Grafana, or Datadog)

Nice to have:

• Understanding of techniques for managing multiple sending addresses and mimicking varied user profiles
• Background in building tools that connect with email platforms like Gmail or Outlook using their APIs or standard protocols (e.g., IMAP, SMTP)
• Solid grasp of how to design and scale systems that handle large amounts of data across multiple components or services

Key Responsibilities:

• Design and support the backend systems that drive outbound messaging infrastructure  
• Build scalable logic to handle high-volume email events, including intelligent queuing and sending limits  
• Create systems for managing multiple domains, IPs, and sender identities across campaigns  
• Automate key processes like warm-ups, rotation strategies, reputation monitoring, and failover response  
• Work closely with the deliverability team to create tools for tracking domain/IP health, handling errors, and avoiding blacklists  
• Develop real-time tools and dashboards to keep tabs on system status, performance, and alerts  
• Ensure that the outbound systems are stable, follow industry standards, and meet compliance requirements  
• Continuously explore ways to boost sending volume while keeping sender reputation strong and consistent  

Get to know DevsData:

We are a technology consulting and recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in global corporations as well as students of the best technical and business universities.

Find out more: devsdata.com