Senior Backend Engineer; AdTech

Full time | Agile Engine | Spain

Posted On 06/05/2026

City Madrid

State/Province Madrid

28022

IT Services

Agile Engine is an Inc. 5000 company that creates award‑winning software for Fortune 500 brands and trailblazing startups across 17+ industries. We rank among the leaders in areas like application development and AI/ML, and our people‑first culture has earned us multiple Best Place to Work awards.

If you’re looking for a place to grow, make an impact, and work with people who care, we’d love to meet you!

Join as a Senior Backend Developer (AdTech) to help build a next‑generation advertising platform powered by scalable backend systems, real‑time data processing, and distributed architectures. You will work with technologies such as Python, Django, Kubernetes, Postgre

SQL, and AWS while contributing to technical direction and engineering standards in an early‑stage environment. This role offers strong ownership, collaboration with experienced engineers, and the opportunity to create products used by millions of people.

• Architect, build, and evolve core systems for the Ads platform
• Design APIs and services supporting campaign management, targeting, delivery, attribution, and reporting
• Build and optimize high‑throughput, low‑latency systems processing large volumes of events and data
• Own critical systems end‑to‑end, including design, implementation, deployment, monitoring, and ongoing improvements
• Drive architectural decisions and establish patterns that support scalability, reliability, and developer productivity
• Collaborate closely with product, data, and partner teams to translate business requirements into robust technical solutions
• Provide technical leadership through design reviews, system discussions, and mentoring other engineers
• Contribute to engineering best practices, documentation, and long‑term platform vision
• Participate in hiring and help grow a strong, high‑performing team

• 5 years of software development experience building scalable systems (backend programming languages/frameworks, e.g. Java, .NET, Python, Node.js etc)
• Experience with Ad Tech
• Experience with DSPs, SSPs, ad exchanges, affiliate programs, Prebid.js, Prebid Server, Google Ad Manager, Amazon UAM/TAM, OpenRTB, identity and addressability solutions, as well as ad operations workflows
• Deep understanding of computer science fundamentals (algorithms, data structures, networking, databases)
• Proven experience designing and scaling distributed systems focusing on performance, observability, and fault tolerance
• Strong architectural instincts and the ability to make high‑leverage technical decisions that impact multiple teams and systems
• Demonstrated ability to influence and mentor senior engineers, guide teams through ambiguity, and elevate engineering practices across the board
• Exceptional ownership mindset — you drive initiatives forward, raise the bar, and deliver lasting impact
• Excellent communication and cross‑functional collaboration skills
• Comfortable operating in a fast‑paced, high‑autonomy, product‑driven environment
• Experience with e‑commerce and catalog management is preferred
• Familiarity with Python, Django, Kubernetes, Postgre
  
  SQL, AWS is strongly preferred
  , but deep expertise in analogous systems and a willingness to learn are welcome

• Strong experience with complex ETL flows and high‑throughput systems is highly preferred

• Professional growth
  :
  Mentorship, Tech Talks, and personalized growth roadmaps
• Competitive compensation
  : USD‑based pay with education, fitness, and team activity budgets
• Exciting projects
  :
  Modern solutions with Fortune 500 and top product companies
• Flextime
  :
  Flexible schedule with remote and office options