APIs You Won't Hate


Factor Eleven · Senior Backend Engineer (f/m/d)


We are looking for an experienced Senior Backend Engineer to expand and optimize our digital advertisement SaaS suite of applications. Using technologies such as NodeJS with TypeScript, federated GraphQL, Docker, AWS and Apache Kafka, you'll be designing microservices and other back-end components, and integrating data storage, monitoring and protection solutions. Your primary focus will be the development of all server-side logic, definition and maintenance of central databases and message busses, and ensuring high performance and responsiveness to requests from the front-end. Additionally you'll conduct regular code reviews, provide guidance to other team members, and contribute to workload estimations, project planning and architecture discussions.

You will join a cross-functional team under a Product Owner to contribute to our multi-tenant SaaS product and ad-serving network.

To ensure success as a Senior Backend Engineer at Factor-Eleven, you should possess extensive knowledge of NodeJS based services, good knowledge of AWS and/or Kafka, great knowledge of GraphQL/REST-APIs and experience in a similar role. An accomplished SBE will be someone whose expertise results in the stable, fast, and secure exchange of data between servers and end-users, and who successfully shares that expertise with the wider team.. Ultimately, a top-class Backend Engineer at F11 should be able to envision, plan, develop, test and deliver scalable microservices in an event-driven multi-tenant architecture, and teach others to do the same.


  • Developing and maintaining microservices and back-end components.
  • Ensuring optimal performance of databases and responsiveness to front-end requests.
  • Collaborating with developers, product owners and stakeholders on the design and integration of elements.
  • Developing high-performance applications by writing testable, reusable, and efficient code.
  • Implementing effective security protocols, data protection measures, and storage solutions.
  • Running diagnostic tests, repairing defects, and providing technical support.
  • Documenting server-side processes, including database schemas, message events and sagas, as well as preparing reports.
  • Recommending and implementing improvements to processes and technologies.
  • Keeping informed of advancements in the field of Node.js, AWS and related development.
  • Participate in code and technical design reviews
  • Write and review tasks and estimate workloads for yourself and others
  • Provide mentorship and technical supervision to team-members



  • 5+ years experience as Backend Engineer or similar role..
  • Strong proficiency of NodeJS with TypeScript, web stacks, libraries, and frameworks.
  • Working knowledge of front-end technologies such as HTML5 and CSS3.
  • Experience with user authentication and authorization between multiple systems, servers, and environments.
  • High familiarity with fundamental design principles behind scalable applications.
  • Creating database schemas that represent and support business processes.
  • Good knowledge of event-driven architecture, message busses, and/or pub/sub-systems.
  • Proven expert knowledge Implementing automated testing platforms and unit tests.
  • Superb interpersonal, communication, and collaboration skills.
  • Exceptional analytical and problem-solving aptitude.
  • Great organizational and time management skills.
  • Excellent familiarity with git, npm, docker and Jira
  • Great Troubleshooting skills
  • Good project management skills
  • Extensive experience in mentoring teammates in a respectful, educative manner



Factor Eleven's tech department is the inhouse tech scale-up responsible for our SaaS product suite offering localized digital advertising to enterprises of all sizes and shapes. We're powering the engine that Factor Eleven is successfully built upon and elevate the possibilities of our product on a daily basis. In 2022 we've scaled up, literally doubled in headcount and in 2023 we'll double again. We're working together to fulfill our ambitions as a top ad-tech provider by continuously leveling up the quality and expanding capabilities of the entire platform, as well as our engineering and product organization.

Join our amazing team in our mission to move digital localized advertisement forward and enjoy the freedom, camaraderie and perks of our fully remote operations.


  • Transparent, above-market salaries
  • 100% remote within Europe
  • Flexible work-hours and part-time models
  • Be part of a fast-growing, highly-skilled team
  • In person department and company events
  • Home office, co-working space and work-together allowance
  • Personal and professional development courses from Udemy
  • Case by case relocation and visa support

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