Senior Backend Engineer – AdTech

Full time | Agile Engine | Spain

Posted On 07/02/2026

City Valencia

State/Province Valencia / València

46003

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!

We are looking for a Senior Backend Engineer to architect and build the core systems of a next-generation AdTech platform that embeds products directly into visual experiences. You will design high-throughput, low-latency services for campaign delivery, targeting, attribution, and partner integrations using Python, Django, Kubernetes, and AWS. This is an early-stage initiative where senior engineers define the technical direction and system architecture from the ground up.

• 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 (This may include 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.
• Availability to work till 1pm EST (till 8 pm Kyiv time).
• 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
  , PostgreSQL
  , and 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.