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Senior Software Engineer - Ads Spain Jobs

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Senior FrontEnd Software Engineer
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Spain , Barcelona
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Amaris Consulting
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Senior Software Engineer
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Join our Barcelona team as a Senior Software Engineer on the core C&E platform. Design and own scalable backend systems, data pipelines, and APIs that power customer segmentation and personalization. We seek an engineer experienced in SaaS architecture and high-throughput systems. Enjoy a hybrid ...
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Spain , Barcelona
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Bsport
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Senior Software Engineer - AI Platform
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Join our team as a Senior AI Software Engineer in Spain. Implement and integrate cutting-edge LLMs and GenAI APIs to enhance real-world applications. We seek strong Python skills and hands-on RAG, prompt engineering, and CI/CD experience. Enjoy remote work, relocation support, health insurance, a...
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Spain
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Fever
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Senior Software Engineer
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Join our Engineering team as a Senior Software Engineer in Spain. Design, build, and own scalable services using RESTful APIs and relational databases. We value clean code, CI/CD, and offer remote work, relocation support, and great benefits.
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Spain
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50000.00 - 65000.00 EUR / Year
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Fever
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Senior Full Stack Software Engineer
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Join bsport, a leading fitness-tech platform, as a Senior Full Stack Engineer. Design scalable microservices and modern React interfaces in a dynamic, hybrid environment. Enjoy competitive compensation, equity, health insurance, and fitness perks in Barcelona or Paris.
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Spain; France , Barcelona Tasso; Paris
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Bsport
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Senior Software Engineer - Frontend
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Join Microsoft's Azure Data team as a Senior Frontend Software Engineer in Spain. Design and develop world-class user experiences for cutting-edge big data and AI analytics products like Microsoft Fabric. Utilize your expertise in JavaScript, TypeScript, and modern frameworks (React/Angular/Vue) ...
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Spain , Multiple Locations
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Microsoft Corporation
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Senior Software Engineer
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Join Microsoft's Ad SDK team in Barcelona as a Senior Software Engineer. Design and optimize high-performance JavaScript/TypeScript SDKs for browser environments. Tackle complex technical challenges in ad-serving technology within a global team. Requires expertise in browser internals and coding ...
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Spain , Barcelona
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Microsoft Corporation
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Senior Software Engineer with Python
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Join a leading global legal tech platform in Madrid as a Senior Software Engineer. Utilize your 6+ years of experience with Python, TypeScript, and modern frameworks to build scalable, high-performance web applications. Enjoy a flexible, remote-friendly culture focused on innovation and well-bein...
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Spain , Madrid
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Babel Profiles
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Senior Software Engineer (Java)
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Join our Madrid team as a Senior Java Engineer. Design and scale a high-performance distributed platform, impacting businesses from day one. Mentor peers, drive architectural decisions, and optimize robust financial data systems. We value clear communication, ownership, and fast-paced iteration w...
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Spain , Madrid
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Adyen
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Senior Software Engineer - Geolocalized Services
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Join our team as a Senior Software Engineer specializing in Geolocalized Services. You will design and build scalable, multi-region backend systems with a strong focus on data residency and privacy compliance. We seek expertise in geo-distributed architecture, CockroachDB/AWS DynamoDB, and backen...
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Spain
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50000.00 - 70000.00 EUR / Year
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Fever
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Senior Software Engineer - Data Science
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Spain , Multiple Locations
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Microsoft Corporation
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Senior Software Engineer
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Join Microsoft's Search Growth team in Barcelona as a Senior Software Engineer. Design and build scalable, consumer-facing search experiences for Bing using C++, Java, or Python. Drive data-driven decisions through A/B testing in a fast-paced, full-stack environment.
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Spain , Barcelona
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Microsoft Corporation
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Senior Backend Software Engineer - Payments & Fraud
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Spain
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Hopper
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Senior Fullstack Software Engineer - Payments & Fraud
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Spain
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Hopper
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Senior Software Engineer, Full Stack
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Spain
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Hopper
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Senior Software Engineer (GOlang)
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Join our Engine team as a Senior Software Engineer specializing in GOlang. You will build and scale the core runtime for Workato's recipe execution, focusing on performance, durability, and distributed systems. This role requires 7+ years of backend experience with scalable applications, database...
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Spain , Barcelona; Madrid
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Workato
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Senior Software Engineer
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Join our team in Barcelona as a Senior Software Engineer. You will build complex Ruby on Rails applications and robust backend APIs, collaborating across teams. We seek 5+ years of Rails expertise, deep Ruby knowledge, and experience with Postgres and caching. Contribute to all development phases...
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Spain , Barcelona
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Workato
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Senior Software Engineer
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Join our team as a Senior Software Engineer in Barcelona or Madrid. You will build complex Ruby on Rails applications and robust backend APIs, collaborating across teams. We seek 5+ years of Rails experience, deep Ruby knowledge, and expertise in Postgres and caching. Contribute to all developmen...
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Spain , Barcelona; Madrid
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Workato
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Senior Software Engineer - Geolocalized Services
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Join our team as a Senior Software Engineer specializing in Geolocalized Services. You will design and build scalable, multi-region backend systems with a strong focus on data residency and privacy compliance. The role requires expertise in geo-distributed systems, CockroachDB or DynamoDB, and ba...
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Spain
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50000.00 - 70000.00 EUR / Year
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Fever
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Senior Software Engineer
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Join Microsoft AI in Barcelona as a Senior Software Engineer. Develop a cutting-edge platform to ground Large Language Models (LLMs) with real-time web data, reducing hallucinations. You'll need expertise in backend technologies like C#/Python and cloud platforms (Azure/AWS). Build scalable, secu...
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Spain , Barcelona
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Microsoft Corporation
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About the Senior Software Engineer - Ads role

Explore senior software engineer jobs in the dynamic and high-impact field of advertising technology. A Senior Software Engineer specializing in Ads is a pivotal role responsible for architecting, building, and maintaining the complex systems that power digital advertising platforms. These professionals work at the intersection of data, performance, and scale, developing the engines that deliver targeted ads, manage real-time bidding auctions, analyze campaign performance, and ensure optimal revenue generation. Their work directly influences the core business metrics of platforms, making this a critical and technically challenging career path.

Typically, professionals in these roles are entrusted with end-to-end ownership of major components within the ad tech stack. Common responsibilities include designing and implementing low-latency, high-throughput distributed systems capable of processing billions of requests daily. They develop algorithms for ad targeting, ranking, and budget pacing, while rigorously optimizing for performance and cost-efficiency. A significant part of the role involves ensuring system reliability and data accuracy, as even minor errors can have substantial financial implications. Collaboration is key; senior engineers frequently work alongside product managers, data scientists, and machine learning experts to translate business requirements into robust technical solutions. They also champion best practices, mentor junior engineers, and lead initiatives to improve code quality, system architecture, and operational excellence.

To excel in senior software engineer jobs within ads, a specific and advanced skill set is required. A strong foundation in computer science fundamentals, data structures, and algorithms is non-negotiable. Proficiency in languages like Java, Go, Python, C++, or Scala is common, coupled with deep experience in distributed systems, cloud platforms (AWS, GCP, Azure), and big data technologies (e.g., Hadoop, Spark, Kafka). Expertise in database design, both SQL and NoSQL, is essential for handling massive datasets. Given the real-time nature of ad serving, knowledge of concurrency, multithreading, and network programming is critical. Furthermore, a solid understanding of the digital advertising ecosystem—including concepts like RTB, DSPs, SSPs, and ad exchanges—is a major advantage. Successful candidates typically possess several years of relevant experience, a proven track record of solving complex scalability problems, and a data-driven, results-oriented mindset. They are proactive problem-solvers who can navigate the trade-offs between system performance, business needs, and technical debt. If you are passionate about building systems at massive scale and directly impacting business growth, exploring senior software engineer jobs in ads offers a rewarding and intellectually stimulating career.

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