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Senior Software Developer - Sending Pipeline

  • Mailgun
  • Full time
  • France
  • 08/07/2021

Mailgun is hiring a Senior Software Engineer to join our sending pipeline team. We represent the core systems that accept, process, and deliver billions of messages each and every month for Mailgun users! As part of this team, you will be working to refactor and develop new techniques for increasing the performance and throughput of the Mailgun sending pipeline to better serve our customers.

Our Team
  • We believe in contributing back to the community. Many of the tools and libraries we’ve developed are open source (
  • We adapt quickly and don’t believe in having unnecessary silos and red tape that keep teams from shipping software. As a developer on the team, you are responsible for not only building great software, but ensuring it is operating properly once it’s been deployed.
  • We have a passion for solving hard problems – our services are responsible for processing billions of messages each month and have to not only scale, but be highly reliable.
  • Develop new features to improve the capabilities of the Mailgun offering.
  • Refactor existing Python services using Go and a microservice architecture.
  • Maintain and scale existing infrastructure.
  • Participation in the on-call rotation.


  • BS in Computer Science or related area.
  • 4+ years of relevant work experience.
  • Experience with high performance scaling, distributed systems.
  • Senior level experience working in Python (some Go experience would be a plus)
  • An interest in continuing to develop your Go skills to an expert level
  • Experience working with MongoDB and/or Cassandra.
  • Experience building APIs and RESTful web services.
  • Comfortable working autonomously with remote teams.


  • HAVE FUN: To encourage extra professional activities, you will have access to a catalog of negotiated offers and will get a refund from Mailgun up to 25€ per month for the activities of your choice, provided that they fit in the 3 following categories: culture /sport /travel.
  • HAVE A NICE LUNCH: Mailgun will credit every month an amount on your meal ticket card which can be used in restaurants and to buy food.
  • KEEPING YOU BALANCED: Mailgun provides free virtual counseling resources through our Employee Assistance Programs. Your mental health is as important as your physical health.
  • TAKE A BREAK: We believe performance at work requires balance at home. This is why we provide 5+ weeks of time-off to all employees.
  • FAMILY PLANNING: We know that families can be built in a variety of ways and this is why Mailgun offers paid parental leave and family planning support.
  • WORK FLEXIBILITY: We offer teleworking opportunities for most of our positions.
  • STAND IN SOLIDARITY: You will be able to take up to 8 hours/ 1 day of paid time off per year to participate in the volunteer program of your choice.
  • TREAT YOURSELF: Our comprehensive anniversary program offers a personalized experience in recognition of milestones achieved.
  • MOVE AROUND SERENELY: We provide 100% reimbursement for the Navigo Pass.

Mailgun embraces diversity and equal opportunity in all aspects of our business. We are committed to building a company that empowers individuals from diverse backgrounds and values diversity of thought as a beacon for performance. The more inclusive we are, the better our work will be.

About Mailgun

Mailgun is the leading API-based email delivery service to send, receive, and track email. Since our start in 2010, Mailgun has delivered innovative technologies to the email space for the benefit of technically progressive companies around the globe. In October 2019, Mailgun furthered this initi...

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