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About the Role
As our Senior Software Engineer, you will join our five-person Contextualization Platform team, building the technology that understands content across the open web, Connected TV (CTV), and in-app environments. You'll develop high-performance backend systems and turn AI innovations into production solutions that power contextual advertising at scale.
Responsibilities
- Design, build, and maintain high-throughput, low-latency services using Golang, supporting an RTB ecosystem handling over 500K queries per second.
- Transform Data Science experiments, LLM capabilities, and AI-driven ideas into reliable production systems.
- Develop APIs, services, and data pipelines that process large volumes of contextual data efficiently.
- Prototype, test, and iterate on new approaches to contextual understanding across OpenWeb, CTV, and in-app environments.
- Contribute to architectural decisions and continuously improve system performance, reliability, and scalability.
- Work closely with Data Scientists, AI teams, and Product Managers to deliver solutions with measurable business impact.
- Write clean, maintainable code while balancing quality, speed, and evolving business priorities.
Requirements
- Strong hands-on Golang experience, building and maintaining backend services in production.
- Solid understanding of distributed systems, particularly high-throughput or low-latency architectures.
- Hands-on experience with LLM APIs, embeddings, or RAG, alongside a strong interest in AI technologies.
- Experience with cloud infrastructure, observability, and production system monitoring.
- Familiarity with Infrastructure as Code principles and tools.
- Strong problem-solving skills and a pragmatic approach to delivering reliable, maintainable software.
- Ability to work autonomously, adapt to changing priorities, and collaborate effectively with technical and non-technical stakeholders.
Skills
- Golang
- Distributed systems
- High-throughput architectures
- Low-latency architectures
- LLM APIs
- Embeddings
- RAG
- AI technologies
- Cloud infrastructure
- Observability
- Production system monitoring
- Infrastructure as Code
- Python
- Node.js
- TypeScript
- RTB
- OpenRTB
- CTV
Location
- Remote
- Hybrid
Work Type
- Remote
- Hybrid
Experience Level
- Senior
Benefits
- Flexible work model with 100% remote or hybrid options.
- Continuous learning through a learning platform and optional language classes.
- A supportive, trust-based culture that values well-being.
- Team activities and opportunities to connect beyond work.
- Home office setup budget up to €1,000
- Paid trips to our HQ in Madrid
- MacBook Pro M3
About the Company
- 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.
- Our proprietary AI, Liz, enables brands to connect with audiences across the open web and Connected TV without cookies or user tracking.
- Founded in 14 by two ex-Googlers, Seedtag has grown to 500+ Seedtaggers in 17 countries, backed by €250M in funding, and operates today as a global ad-tech leader.
- If you enjoy solving complex engineering challenges and building AI-driven systems at scale, you’ll feel right at home here.
Equal Opportunity
- At Seedtag, we create an environment where everyone can thrive. If you need accommodations during the hiring process, let us know and we’ll ensure a positive experience.