Principal Backend Developer (Node.js)

At eyeo, we transform the internet into a trusted, sustainable and accessible place where users regain control over their experience, content creators and publishers are rewarded for their content, and advertisers and consumers can connect on mutually agreed terms. 

With multiple brands across the ad tech space, eyeo offers solutions for publishers, advertisers, ad-tech solutions providers and over 400 million ad-filtering users worldwide. eyeo’s market-leading ad-filtering technology powers products like Adblock Plus and AdBlock as well as technical integrations for popular browsers and smartphone OEMs. 

Our subsidiary, Blockthrough, is the most popular ad block recovery solution among the Comscore-150, offering premium demand via direct seats with top-tier SSPs, allowing effective content monetization and providing a platform where publishers and advertisers can efficiently transact.

We believe in creating a positive and empowering workplace where work-life balance is a priority. With a dedicated learning and development budget, you'll have the tools to grow and advance your skills, while contributing to clearly defined personal and company goals. Our people-first culture ensures you feel appreciated for your work and know that your contributions truly matter.

Your day-to-day activities

We are building the foundations for a consistent and better user experience for our massive user base across multiple platforms, including apps, web, routers and devices. We need to build a swathe of foundational core services that can serve all these users wherever they are, at a scale that is a bit daunting. Specifically, we need your expertise as a leader in designing and building secure, stable and scalable services and applications. Your track record of maintaining and monitoring after launch and aligning with the product owners and client teams will also prove invaluable.

• Design and develop scalable, high-performance microservices and APIs that will power our mobile applications, browser extensions and websites
• Drive end-to-end solutions by aligning and integrating efforts across multiple client teams, ensuring seamless delivery and alignment with organizational objectives
• Ensure the security and robustness of applications by applying secure development practices and adhering to industry standards
• Establish monitoring frameworks and drive performance optimization efforts, proactively ensuring reliability, scalability, and cost-effectiveness for mission-critical applications
• Collaborate with other engineers, Product Managers, UI/UX Designers, and cross-functional leaders to drive strategic alignment on product goals, ensuring cohesive user experiences across multiple teams and products
• Guide senior developers in advancing their technical expertise and drive high-impact code review processes
• Stay ahead of emerging technologies and cloud innovations, evaluating and incorporating cutting-edge tools and techniques where appropriate

What you bring to the table

• 15+ years of professional development experience and a proven track record of designing and building scalable services and APIs, leveraging microservices architecture and event-driven systems. Proficiency in NodeJS is a plus
• Knowledge of frontend clients, frameworks and their needs
• Solid understanding of cloud platforms, with a preference for Google Cloud, and hands-on experience with cloud-native services
• Familiarity with secure development practices and ability to implement secure coding principles
• Strong understanding of schema design, database systems (SQL and NoSQL), caching strategies, and web protocols such as HTTP/S, WebSocket, and gRPC
• Ability to debug complex issues, optimize performance, and deliver robust solutions
• Passionate about monitoring, logging and overall system health
• Excellent communication skills and ability to work effectively across teams

It’s awesome if you have

• Familiarity with GraphQL APIs
• Contributions to open-source projects or a technical blog presence
• Experience with authentication technologies like OAuth, OpenID Connect, and API key management

How and where we work

eyeo is a global employer with over 300 colleagues based all over the world. We love our diversity and take great pride in our company culture. We practice an independent, remote workstyle with work distributed in cross-functional matrix teams that span predominantly EST and CET time zones. If working remotely isn’t for you, we also have our HQ in Berlin and offices in Cologne, Toronto and soon in NYC that you can choose to work from. Our in-person team and company meetings foster community and collaboration. By enabling remote work and in-person sessions, we have built a culture that provides a unique dynamic of flexibility and belonging.

What we offer

At eyeo, we are committed to fostering a truly inclusive environment, where we build with everyone for everyone. 

We understand that each person’s life and schedule are unique. That’s why we offer flexible work arrangements, allowing you to plan your hours in a way that best suits your personal needs. Whether you prefer to work from home or from one of our offices in Berlin, Cologne, or New York—we designed our work approach so you can thrive, wherever you choose to be. If you choose to join us in one of our offices in Berlin or Cologne, we offer comprehensive relocation support to ensure a smooth and seamless transition.

Supporting your growth is important to us. We offer an annual learning and development budget of 1.500 EUR, giving you the freedom to choose to broaden or sharpen existing skills or to tap into something completely new. Because life evolves, so should your opportunities to grow. To further support your long term growth and well-being, we offer sabbatical leaves after two years with the company, allowing you to recharge, explore, and return with renewed energy.

We’re also committed to supporting parents to balance work and childcare. Our monthly childcare stipend of up to 500 EUR per month helps to lighten your load, so you can focus on the moments that matter most: both at work and at home.

Equal Opportunity Statement 

At eyeo, we are committed to fostering an inclusive environment where every employee is empowered to thrive. We believe that the diversity of our backgrounds and experiences enhances our products and services, and we take pride in being a safe space for everyone. 

All qualified applicants will receive equal consideration for employment, regardless of race, color, nationality, religion, sexual orientation, gender, gender identity, age, physical ability, or duration of unemployment. We celebrate diversity and are dedicated to creating a workplace where everyone feels valued and respected.