We’re looking for a Backend Software Engineer - AdExchange to join our tech team and help build the future of neuro-contextual advertising at global scale. Who We Are 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 2014 by two ex-Googlers, Seedtag has grown to 700+ 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. Your Challenge You will be architecting, refining and developing the backend services that power our AdExchange. In an industry where milliseconds determine success, you will focus on: - Optimising the high-throughput real-time bidding systems where you'll balance ultra-low latency requirements with cost-efficiency and reliability, ensuring our infrastructure scales sustainably. - Integrating new demand partners, owning the full lifecycle from capacity planning and endpoint configuration to traffic shaping and performance validation. - Designing pricing and auction mechanics, including bid flooring systems and dynamic margin calculations, serving machine learning models in real-time to optimise revenue. - Building event pipelines and reporting integrations that enable data teams to analyse performance, debug issues, and feed AI models. - Working on end-to-end projects from concept to production, making technical decisions, managing priorities, and communicating effectively with stakeholders across the company. - Collaborating closely with cross-functional teams with a data-driven analytical mindset, validating hypotheses with real data and aligning engineering work with business goals. This is a high-impact challenge that will shape the future of Seedtag. If you are up to the challenge and want to be a part of a talented and passionate team, we encourage you to apply for this position. Our Core Values Outcome over Output We measure success by impact and value, not by volume of features or lines of code. Failure Is Allowed, Learning Is a Must Experimentation is key to innovation. We test early, iterate often, and learn fast. We Are All Scouts We take ownership and leave things better than we found them. We Are Data-Driven Data informs our decisions and helps us continuously improve our systems and results. Tech Stack - We use Go, Typescript, Python, Mongo, Redis, Google Cloud, Kafka... - We craft high-throughput ⚙ micro-services, APIs, data pipelines, async message queues… - We breathe DevOps, love Kanbans, Pair Programming, Peer Reviews, Continuous Discovery, Delivery and Integration. - We are on Slack, Notion, JIRA, and GitHub. What You’ll Need to Succeed - You have a deep understanding of back-end development. You have at least 5 years of demonstrable experience working in software engineering, with a focus on building back-end systems. You have experience using it to build scalable, high-performance systems. - You care about producing maintainable code over time using good programming practices. You have experience applying programming patterns. - You have experience with high-throughput systems and distributed architectures. You are comfortable working with systems that handle large amounts of data and have experience building systems that scale to meet demand. - AI-Augmented Productivity: You embrace AI tools (GitHub Copilot, Claude code, LLMs, etc.) as a fundamental part of your daily workflow. You understand how to leverage these tools to speed up boilerplate coding, debugging, and learning, allowing you to focus on high-level architecture and complex problem-solving. - You are a big-picture thinker who can see the forest and the trees. You have a strong understanding of the technical and business requirements of the projects you work on, and you can think strategically to ensure that your work aligns with the goals of the company. - You are a problem solver who loves a good challenge. You are energised by tackling complex technical problems and figuring out creative solutions. - You are a continuous learner who is passionate about your craft. You are committed to staying up-to-date with the latest developments in back-end engineering and are always looking for ways to improve your skills and knowledge. - You are a strong communicator who can work effectively in a team. You are comfortable working collaboratively with others, and you are able to effectively communicate complex technical concepts to both technical and non-technical stakeholders. If you possess these qualities and are excited about the opportunity to work on challenging, high-impact projects with a talented and passionate team, we encourage you to apply for this position. Why Join Seedtag? - 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. Additional Perks - Home office setup budget up to €1,000 - Paid trips to our HQ in Madrid - MacBook Pro M3 Ready to Join the Seedtag Adventure? 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. Send us your CV and let’s build the future of neuro-contextual advertising together.

We’re looking for a Backend Software Engineer to join our tech team and help build the future of neuro-contextual advertising at global scale. Who We Are 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 2014 by two ex-Googlers, Seedtag has grown to 700+ 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. Your Challenge As Backend Software Engineer, you will: - Be responsible for building and improving services which will have a direct impact on our client’s advertising KPIs and operational efficiency. - Work on end-to-end projects, taking solutions from concept to production, and focusing on creating scalable, efficient, and impactful solutions. - As a member of our engineering team, you will develop new projects mainly on the backend side, but sometimes, you’ll support particular frontend needs. You’ll be in charge of the CI/CD, dimensioning production instances and scaling. - Provide an analytical mindset, being able to go to our data lake in order to validate your own hypothesis and try to get your own conclusions to discuss afterwards with the team. - Collaborating closely with our cross-functional teams, your work will be aligned with business goals and drive the practical application of your solutions. Our Core Values Outcome over Output We measure success by impact and value, not by volume of features or lines of code. Failure Is Allowed, Learning Is a Must Experimentation is key to innovation. We test early, iterate often, and learn fast. We Are All Scouts We take ownership and leave things better than we found them. We Are Data-Driven Data informs our decisions and helps us continuously improve our systems and results. Tech Stack We operate at large scale, supporting up to 120k requests per second, with ML models responding in under 10 milliseconds and processing 20 TB of data daily. Our stack includes: - Languages: Python, Go, TypeScript, Scala - Cloud & Infrastructure: Kubernetes, GCP, AWS - Streaming: Kafka, Kinesis - Data: Datalakes, GCS, Redis, Druid, MongoDB - Architecture: 100+ microservices, DevOps-driven, continuous deployment What You’ll Need to Succeed - You bring 3-5 years of experience into backend software engineering, from the conceptualization of the problem to the deployment in production and validation that works. - You have collaborated on some front-end projects even if it’s not your strongest skill. - You are a DevOps-oriented engineer who is responsible for the CI/CD of the services you build, you understand how to do the sizing of production deployment and how to troubleshoot if something is not working as expected. - You deeply understand the problem you are trying to solve. You measure the outcome of the development you do. - You have worked in related disciplines which can include Data engineering pipelines, infrastructure provisioning or deployment of ML models in production. Why Join Seedtag? - 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. Additional Perks - Home office setup budget up to €1,000 - Paid trips to our HQ in Madrid - MacBook Pro M3 Ready to Join the Seedtag Adventure? 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. Send us your CV and let’s build the future of neuro-contextual advertising together.

🧠 ¡BUSCAMOS DESARROLLADOR NODE.JS BACKEND SENIOR! 🧠 ¿Tienes experiencia sólida construyendo backend con Node.js en arquitecturas de microservicios sobre AWS y quieres seguir creciendo en proyectos de alto impacto? 🎯 Objetivo del rol: Desarrollar y mantener servicios backend robustos, seguros y escalables usando Node.js, participando en el ciclo completo de desarrollo y despliegue sobre AWS. 🎓 Requisitos del perfil - Formación académica: Ingeniero de Sistemas o profesional de carreras afines a TI. - Experiencia: Al menos 4 años de experiencia en desarrollo backend usando Node.js. - Conocimientos indispensables: Dominio avanzado de Node.js Comprensión de patrones de diseño backend Experiencia en pruebas unitarias Experiencia en desarrollo y despliegue de aplicaciones sobre AWS Amplia experiencia en desarrollo de microservicios y consumo de servicios REST y SOAP Conocimientos de Terraform y despliegue con Jenkins Conocimiento en metodologías ágiles Experiencia con funciones como servicio (serverless) Conocimientos en cifrado E2E de información, autenticación y automatización con tokens 💡 Competencias personales - Capacidad de análisis para resolver problemas técnicos complejos - Orientación a la calidad del código y buenas prácticas - Trabajo en equipo en entornos ágiles - Comunicación clara con perfiles técnicos y funcionales - Proactividad para proponer mejoras en arquitectura y seguridad ⚙️ Responsabilidades principales - Desarrollar y mantener servicios backend en Node.js bajo arquitectura de microservicios. - Implementar y mantener pruebas unitarias que garanticen la calidad del código. - Participar en el desarrollo y despliegue de aplicaciones en AWS, incluyendo componentes serverless. - Consumir e integrar servicios REST y SOAP con enfoque en seguridad (cifrado E2E, autenticación y tokens). - Apoyar la automatización de despliegues utilizando Terraform y Jenkins, dentro de un entorno de trabajo ágil. 🕒 Condiciones laborales - 📍 Ubicación: Remoto Colombia - 🧩 Tipo de contrato: Nomina - ⏰ Horario: Lunes a viernes - 💰 Salario: A convenir - 🎁 Beneficios para tu bienestar y estilo de vida 🌐 TALYCAP GLOBAL – Conectamos el mejor talento IT con proyectos de alto impacto. #AS400 #Synon #CA2E #IBMi #TalycapGlobal

We’re looking for a Mid-Senior Backend Engineer - AdExchange (Inventory & Enrichment) to join our tech team and help build the future of neuro-contextual advertising at global scale. Who We Are 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 2014 by two ex-Googlers, Seedtag has grown to 700+ 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. The Role You will join the AdExchange Engineering Team, the "engine room" of Seedtag. Your primary focus will be on Inventory Management and Bid Enrichment. This is a high-stakes environment where you will build the logic that categorises global ad inventory and enriches bidding requests with real-time contextual data. You will work in a high-throughput ecosystem where we don't just "deliver code"—we form hypotheses, measure real business impact, and iterate with an agile mindset to optimise our auction win rates and revenue. Your Challenge As a Mid-Senior Backend Engineer - AdExchange (Inventory & Enrichment), you will: - Inventory & Bid Enrichment: Own the core services that manage our global ad inventory and enrich bids with contextual metadata. This is a critical "hot path" in our infrastructure where low latency is non-negotiable. - High-Performance Node.js: Utilise Node.js, TypeScript, and Fastify to build ultra-low-latency services capable of handling hundreds of millions of requests daily. - Architectural Excellence: Lead the way in applying Hexagonal Architecture and Domain-Driven Design (DDD) to ensure our AdExchange remains maintainable and scalable as we grow. - Event-Driven Systems: Design and evolve our data pipelines using Kafka, ensuring that bid enrichment and inventory updates are processed reliably and asynchronously. - Technical Ownership: You will be responsible for making key technical decisions, managing project timelines, and collaborating with Data and Product teams to drive the project forward. - Quality & Observability: Ensure our services are not only fast but also resilient, well-tested, and fully observable through robust monitoring and logging practices. Our Core Values Outcome over Output We measure success by impact and value, not by volume of features or lines of code. Failure Is Allowed, Learning Is a Must Experimentation is key to innovation. We test early, iterate often, and learn fast. We Are All Scouts We take ownership and leave things better than we found them. We Are Data-Driven Data informs our decisions and helps us continuously improve our systems and results. Tech Stack We operate at large scale, supporting up to 120k requests per second, with ML models responding in under 10 milliseconds and processing 20 TB of data daily. Our stack includes: - Primary: Node.js, TypeScript, Fastify - Secondary: Go (Golang) - Data & Messaging: Kafka, MongoDB, Redis - Infrastructure: Kubernetes, AWS, Terraform - Patterns: DDD, Hexagonal Architecture, Event-Driven Microservices What You’ll Need to Succeed - The 5-Year Milestone: You have 5+ years of demonstrable experience in software engineering, with a focus on building high-performance backend systems. - Node.js & TypeScript Expert: You have a deep understanding of the Node.js event loop and asynchronous programming. Experience with Fastify is a significant plus. - Architectural Practitioner: You don't just know the theory; you have experience implementing Hexagonal Architecture (Ports & Adapters) and DDD. You know how to define clear domain boundaries and isolate business logic from infrastructure. - Distributed Systems Knowledge: You are comfortable with Event-Driven Architectures and message brokers like Kafka. You understand the challenges of eventual consistency and distributed data. - The "Big Picture" Thinker: You understand the business context of your work. You can balance the need for "perfect code" with the pragmatic need to deliver value and iterate based on data. - Software Craftsmanship: You are an advocate for Clean Code, SOLID principles, and TDD. You take pride in producing code that is easy for your peers to read and maintain. - Curiosity for Go: While our core stack for this role is Node.js, we have services in Go (Golang). You don't need to be an expert, but you should be excited to learn and contribute to our Go codebase when needed. - AI-Driven Efficiency: You see AI as a partner in engineering. You actively use AI tools to increase your productivity, from generating unit tests to refactoring legacy patterns. You are curious about how AI can help us build more resilient systems faster and you stay updated on the best ways to integrate it into a professional SDLC. Why Join Seedtag? - 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, the UK, Belgium, the Netherlands, 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. Additional Perks - Home office setup budget up to €1,000 - Paid trips to our HQ in Madrid - MacBook Pro M3 Ready to Join the Seedtag Adventure? 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. Send us your CV and let’s build the future of neuro-contextual advertising together.