We’re looking for a Senior Software Engineer - AdExchange to join our team and help shape the future of contextual advertising as we continue to expand globally.

Who We Are
At Seedtag, our goal is to lead the change in the advertising industry because we believe that effective advertising should not be at odds with users’ privacy.
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 that finds 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 for their brand. All of this, without relying on cookies or any other tracking mechanisms.
Every day, our teams develop new services that reach over 200 million users worldwide with fast response times to ensure that we deliver the best user experience. We’re fully committed to the DevOps culture, where we provide the platform that our Software Developers and Data Scientists use to manage over 100 different microservices, pushing dozens of changes to production every day. All of this is built on top of Kubernetes in Google Cloud Platform and Amazon Web Services.
If you are interested in joining one of the fastest-growing scale-ups in Europe and working on massive scalability challenges, this is the place for you.

Your Challenge

• You will be responsible for building and improving the backend services of the ad exchange which have a direct impact on our publishers and client’s advertising KPIs.
• You will work on end-to-end projects, taking solutions from concept to production, and focusing on creating scalable, efficient, and impactful solutions.
• 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.
• You’ll provide a data-driven analytical mindset, being able to validate your own hypothesis with data 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

Our core tech 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 tech 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 scouts

Another core value we hold is that we are all 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 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 models and processes to ensure that we are delivering the best possible outcome for our customers.

Tech Stack
We have to support 120k requests per second running with ML models in production answering within 10 milliseconds! We have this running in production with Python and GoLang microservices using datalakes, GCS, Redis, Kinesis or Kafka. All this is constantly deployed in GCP using Kubernetes and other kinds of production stacks. The current stack outputs 20 TB of daily data having them ready to use for analytics and more with easy and low latency access.
In the rest of the company, we also develop in Typescript for Nodejs and Scala making use of technologies like Kafka, Druid and MongoDB all over the Google Cloud Platform.


What You’ll Need to Succeed

• 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.

Why Join Seedtag?
Growth & Opportunity: A key moment to join with vast career development prospects.
Flexibility: At Seedtag, we trust you to balance work and life effortlessly with the option to a 100% remote (Please note that while we operate as a 100% remote company, we can only extend contracts within Europe in countries where we have established legal entities: Spain, Italy, the UK, Belgium, the Netherlands, France, and Germany) or hybrid work setup, depending on what works best.
Learning & Development: Online courses in ODILO and optional English or Spanish group classes.
Inclusive Culture: We foster a supportive environment that values personal growth.
Fun & Connection: Participate in team activities, company offsites, and more!

Additional Perks

• Flexible benefits plan: Restaurant, transportation, and kindergarten vouchers.
• Health insurance: Comprehensive coverage is included.
• Gympass: Access to wellness programs and fitness classes.
• Seedsave Program: Exclusive discounts to help you save for the future.
• Build your home office with a gross budget of up to 1K€ (external screen, chair, table...).
• Paid travel to our HQ in Madrid to work p2p with your squad members.
• Macbook Pro M3.

Ready to join the Seedtag adventure? Send us your CV, and let’s grow together!

At Seedtag, we’re committed to creating an inclusive environment where everyone can thrive. We welcome diverse perspectives as they fuel our innovation and growth. Please let us know if you require accommodations during the hiring process, and we’ll ensure a positive and accessible experience.