Back-end Engineer en Madrid o en remoto


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Descripción de la oferta

We are looking for a talented SeniorBackend Engineer 🧑🏽‍💻 to help us change the world of digital advertising together. We want to become the most sophisticated and intelligent AdExchange for our brands and publishers. Are you the one?


We’re the leaders of ⚙️ Contextual Advertising Technologies, At Seedtag our goal is to promote a better advertising industry where effective advertising respects the user’s privacy and experience.

By combining Natural Language Processing and Computer Vision, our proprietary Machine Learning-based technology provides a human-like understanding of the content of the web. We find the best context for each ad, while providing unparalleled risk-mitigation capabilities that protect advertisers from showing their ads on pages that could be damaging to their brand. All of this, without relying on cookies or any other tracking mechanisms.

We are a scale-up in a 📈 hyper-growth phase so we need to ensure that our product can scale up, and we need your 🧠 brain for this !

We want you to 💡 innovate and we have plenty of space for you to develop professionally!


2014 · Founded

2018 · 16M€ total turnover , getting growth and going international

2021 · Raised 40M€ , 230 Seedtaggers in 10 countries

2022 · Raised 250M€ , expanding into the U.S market

👉 2023 · Where will 😎 you bring us ?


…in numbers 🤯:

  • We handle more than 180 billion of events per day
  • We process on average 600,000 web pages per hour
  • Our CDN serves 1.5 petabytes every month to 200 million devices worldwide

So... it’s all about 🏎️ speed.

Your 😎 mission (if you accept it) is to make our platform . . . . Harder, Better, Faster, Stronger !


As a senior Backend Engineer at Seedtag, you will be taking on an exciting and important challenge: scale one of the three business lines at Seedtag. You will be working closely with our tech ( engineering, data and product) team, within three squads, to ensure that the adexchange is executed in the most efficient and effective way possible. This is a major undertaking that requires significant technical and leadership skills. You will be expected to use your experience to make key technical decisions, manage project timelines and priorities, and communicate effectively with stakeholders across the company.

This challenge will provide you with the opportunity to work on a high-impact team that will shape the future of Seedtag. It will also be a chance for you to further develop your technical skills, as you work with cutting-edge technologies such as Typescript, Golang, Mongo, Redis, and Kafka. If you are looking for a challenge that will push you to grow both professionally and personally, then this is the opportunity for you.

🚀 This is a high-impact challenge that will shape the future of Seedtag.

💻 You will be working with cutting-edge technologies such as Typescript, Golang, Mongo, Redis, and Kafka.

🧑‍💼 You will be responsible for driving this project forward and making key technical decisions with your peers.

📈 This project is critical to Seedtag's success and requires someone with demonstrable experience in Go and who cares about producing maintainable code over time using good programming practices, someone who has experience applying programming patterns within a microservice and communicating services.

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.


🎯 Outcome over output

Our core engineering values reflect our commitment to delivering exceptional results, fostering a culture of continuous learning, and always putting the customer's needs first. We believe that success comes from focusing on the outcomes rather than just the output. Our engineering team aims to solve problems that make a meaningful difference, and we measure our success by the impact we have on the customer.

💡Failure is allowed, learning is a must

We also recognize that failure is an inevitable part of the innovation process. Our team understands that setbacks are opportunities to learn and grow. We believe in testing early and often, and we continuously iterate and improve until we arrive at the best solution.

👨‍👩‍👧‍👦 We are all boy scouts

Another core value we hold is that we are all boy scouts. We believe in leaving things better than we found them. This means we take ownership of our work and strive to improve the systems and processes we touch. We encourage our team members to be proactive in identifying areas for improvement, and we value those who take the initiative to implement positive changes. Our goal is to leave a lasting, positive impact on our projects and our team.

📊 We are data-driven

Lastly, our team is data-driven. We believe that making informed decisions based on data is crucial to our success. Our engineering team uses data to guide our decision-making process and to identify opportunities for improvement. We are committed to using data to continuously monitor and optimize our systems and processes to ensure that we are delivering the best possible outcome for our customers.


We use Typescript, Golang, Mongo, Redis, GCP, Kafka...

☝ do you know them as well? ( )

We craft high-throughput ⚙ micro-services, APIs, data pipelines, async message queues…

☝have you done that too?

We breathe DevOps, love Kanbans, Peer Reviews, Continuous Discovery and Delivery

☝so do you?

We are on Slack, Notion, JIRA, Github

☝you like these too?


  • 🚀 You have a deep understanding of back-end development. You have at least 5 years of demostrable 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 within a microservice. you know about Patterns or practices for communicating services.
  • 🌐 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.
  • 🤔 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 energized 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.
    • 🏎️ You are adaptable and flexible. You are comfortable working in a dynamic, fast-paced environment, and you are able to adjust to changing priorities and requirements.
    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.


    • 🚀 Key moment to join Seedtag in terms of growth and opportunities
    • 💯 One Seedtag: Work for a month from any of our open offices with travel and stay paid if you’re a top performer (think of Brazil, Mexico..., 🏖️)
    • 🍽️🚘 Access to a flexible benefits plan with restaurant, transportation, and kindergarten tickets and discounts on medical insurance
    • ⌛ Real flexible schedule to balance work and personal life. You will be free to choose your work from home and office time.
    • 🏋 Gympass, you will have access to wellness apps with certified psychologists, nutritional plans, on-demand classes and much more.
    • 🇬🇧 🇪🇸 🇫🇷 Optional company-paid English, Spanish and/or French courses
    • 📚 Odilo online school, where you can learn as much as you want
    • 🍻 We love what we do, but we also love having fun. We have many team activities you can join and enjoy with your colleagues!


    • Growth: International, highly demanding work environment in one of the fastest growing AdTech companies in Europe. We reject "that’s the way it’s always been done". In Seedtag you can find an energetic, fresh workplace, multicultural work environment where our members are from different countries in Europe, LATAM, US and so many more!
    • Impact: The chance to have a direct impact, here you don't work for the sake of working, we all have an impact on seedtag in our own way, rowing in the same direction.
    • Diversity of methodology and people: Seedtag DNA is unique and highly appreciated by very different types of Seedtagers. We embrace diversity and encourage everyone to seek the best version of themselves and to show who they really are. With a total flexible methodology.
    • Flexibility: At Seedtag, we trust you, you can work from home, the beach or the office in our hybrid mode .

    Are you ready to join the Seedtag adventure? Then send us your CV!


    Acerca de Seedtag

    • Marketing

    • Madrid, Spain

    • 50-200

    • 2014


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