Senior Engineer, Retail Media / AdTech Solutions (m/f/d) in Köln, Deutschland

About Redcare Pharmacy:

As Europe’s No.1 e-pharmacy Redcare Pharmacy is powered by passionate teams and cutting-edge innovation. We strive to create a healthy collaborative work environment where every employee feels valued and inspired to contribute to our vision “Until every human has their health”. If you’re seeking a career that offers purpose and aligns with your values join us and start your #Redcareer today.

About the role: 

As a  Senior Engineer (m/f/d) in the  Retail Media Ad Solutions area , you will play a critical role in designing and building high-performance, scalable AdTech solutions that power our growing Retail Media ecosystem. You'll work across the stack, from backend services to customer-facing interfaces, with a strong focus on clean architecture, data performance, and user-centric development. Working closely with your cross-functional team, you’ll help turn complex business needs into robust, end-to-end technical solutions that deliver measurable impact.

About the tech stack:

React, https://jobeax.com/link/Z30sZYC3jcRenVso, TypeScript, https://jobeax.com/link/JSd7UYCSg572jJDY, https://jobeax.com/link/Q9uw8zwicH0Cg2ME, NestJS, MongoDB, Redis, BullMQ, RabbitMQ, Algolia, Docker, Kubernetes (GKE), Google Cloud Platform, CircleCI, ArgoCD, and integrations with modern ad-serving platforms.

While this is a remote position based in Germany, it may require occasional on-site collaboration at our offices in Berlin or Cologne, depending on business and team requirements.

Job Description

About your tasks: 

• System Architecture & Engineering:  Develop and optimize  https://jobeax.com/link/OUm7JcaAbH4l3vIT microservices , focusing on performance, modularity, and scalability. Contribute to architectural decisions that improve system maintainability and reliability.
• Frontend Development:  Build and maintain  React applications using  https://jobeax.com/link/Z30sZYC3jcRenVso (Pages Router)and  Material-UI . Implement advanced form logic using  Formik and  JSONSchema validation. Ensure exceptional user experiences through responsive, accessible, and high-performance UI.
• Data & Messaging Systems:  Integrate and optimize high-throughput data systems using  MongoDB ,  Redis , and  Algolia for real-time ad delivery and insights. Work with  BullMQ and  RabbitMQ to handle reliable, distributed message queuing and background processing.
• Cross-Functional Collaboration:  Partner with Product, Design, and Analytics teams to deliver end-to-end Retail Media features. Participate in sprint planning, technical reviews, and solution discovery to ensure engineering is aligned with business goals.

Qualifications

About you:

• Strong hands-on skills in  JavaScript/TypeScript ,  https://jobeax.com/link/JSd7UYCSg572jJDY ,  React , and modern web technologies.
• Deep experience building  scalable microservices and  frontend applications in cloud-native environments.
• Familiarity with  AdTech or  Retail Media platforms (eg such as Kevel, Google Ad Manager, CitrusAd, TopSort) will be looked upon favourably. 
• Committed to writing  clean, maintainable, and efficient code , with a strong focus on  scalability, testing, and long-term system health .
• Comfortable working in  Agile/Scrum teams and contributing proactively to cross-functional initiatives.
• A continuous learner who thrives in fast-moving environments and enjoys solving real-world business challenges with technology.
• Have AI experience, have integrated it into real systems and shipped features with it.

Additional Information

About your benefits:

In order to provide you with the best possible support for your individual needs - whether it‘s living a healthy life, having enough time for your family, or developing your skills - we offer a wide range of different, site-specific benefits:

• Sports: Stay healthy. Profit from a membership (M) package at Urban Sports Club, so that you can take advantage of a huge variety of sport offers.

• Work from Home: If your job does not require you to be present in the office, we can arrange the place you work from individually - even for up to 20 days a year anywhere in the EU.

• Mobility: We provide our employees with a fully costed Deutschland Ticket which can be used at any time.

• Personal development: Grow! We support and encourage your individual development through various in- and external trainings.

• Vacation: 30 days paid vacation per annum (plus another day on Rosenmontag) and the option to take unpaid vacation of up to 10 days (after one year working with us).

• Employee discount: You get a 10 % employee discount on all over the counter, beauty and personal care products in our online store & 20 % discount on nu3.