Agentic platform engineer in adtech

We’re looking for a Senior Agentic Platform Engineer to join our tech team and help build the future of neuro-contextual advertising at global scale. At Seedtag, our mission is to transform advertising by proving that effectiveness and user privacy can truly coexist. As the leading Neuro-Contextual Advertising Company, we combine Artificial Intelligence, Natural Language Processing, Computer Vision, and neuroscience to understand not only what content is about, but how it makes people feel and what they intend to do next.

• Design, build, and maintain the core Liz Agent runtime, including agent execution, context management, and event streaming.
• Develop MCP tool servers, APIs, and authentication and policy services to enable secure agent access to internal data and capabilities.
• Enhance agent capabilities through multi-model routing, memory, durable execution, and LLM frameworks.
• Ensure platform stability, performance, and production debugging through monitoring, tracing, and evaluation tools.
• Define scalable APIs, service patterns, CI/CD pipelines, and cloud-native deployment standards that enable teams to build agents independently.
• Implement robust security controls, prompt-injection protection, automated evaluations, and regression testing.
• Drive architectural decisions, mentor engineers, and collaborate with Data, ML, Platform, and Product teams.

• 5+ years of experience building and maintaining production backend systems.
• Strong Python expertise, including APIs, asynchronous programming, testing, and clean architecture.
• Hands-on experience developing LLM applications or AI agents in production.
• Solid understanding of event-driven architectures, microservices, Kubernetes, and cloud infrastructure.
• Experience with LLMOps, observability, CI/CD, and production troubleshooting.
• Knowledge of AI security, including authentication, access controls, and prompt-injection protection.
• Proven ability to lead technical decisions, mentor engineers, and work autonomously in a collaborative environment.

• A key moment of growth with real ownership and global impact.
• Flexible work model with 100% remote or hybrid options. (Remote contracts available in Spain, Italy, UK, Belgium, Netherlands, France, and Germany.)
• Continuous learning through a learning platform and optional language classes.
• A supportive, trust-based culture that values well-being.
• Team activities, offsites, and opportunities to connect beyond work.
• Home office setup budget up to €1,000
• Paid trips to our HQ in Madrid
• MacBook Pro M3