• Enfoque en ofrecer la mejor experiencia de usuario (UX). • Análisis y resolución efectiva de problemas. • Colaboración en equipos multidisciplinarios. • Orientación a la eficiencia y comunicación clara. • Proactividad e interés por la investigación y la mejora continua. • Aplicación de buenas prácticas de testing y metodologías ágiles.

C2C is not available Must be authorized to work in the U.S. without sponsorship Why you will enjoy Mondays again: - Opportunity to collaborate with a diverse group of colleagues in a fun, creative environment - Progressive career journey and opportunity for advancement - Continuous development through training, mentorship and certification programs - Exposure to modern technologies across various industries in an agile environment - Flexibility to work remotely, onsite or a hybrid of both as desired in certain locations - Competitive salary + bonus opportunities - Robust benefits package, matching 401(k) plan, and substantial PTO - Tuition reimbursement A Day in the Life: - Build and maintain scalable, high-performance web applications using React and Java - Develop responsive user interfaces using React, TypeScript, and modern CSS frameworks like Tailwind - Design and implement robust back-end functionality and APIs using Java and the Spring ecosystem - Implement sophisticated application state management using Redux and Redux-Sagas - Create and consume RESTful services to ensure seamless integration between front-end and back-end systems - Build new systems and enhance existing software products with a focus on code quality and performance - Utilize modern styling approaches including styled-components and Bootstrap to deliver high-quality UX - Design, code, and test full-stack solutions to meet complex business and client requirements - Manage application-wide data flow using Next.js and high-level JavaScript patterns - Collaborate with cross-functional teams through code reviews and shared development best practices - Ensure the successful delivery of technical milestones and high-quality code deliverables - Contribute to all phases of the SDLC from initial architecture to final testing and deployment What it takes: - Consultative approach and problem solving skills to successfully align digital solutions with long-term business goals of the client - Commitment to understanding and exceeding client expectations - Ability to perform project oversight and execution of deliverables - Flexibility to adapt within a high-growth organization - Ability to lead, mentor and motivate those around them - Hunger for continuous learning and professional development - Intellectual curiosity to provide creative solutions - Full understanding of the software development life cycle - Ability to positively impact fellow colleagues through effective leadership, presentations, coaching, etc. - Desire to work in a team environment - Good interpersonal, written and verbal communication skills Regardless of your specific role, we seek individuals who are excited to explore, adopt, and evangelize AI tools and methodologies. If you have experience in AI or a proven track record of rapidly learning and mentoring others on emerging tech, you’ll fit right in. Equal Employment Opportunity Policy: Sparq is proud to offer equal employment opportunity without regard to age, color, disability, gender, gender identity, genetic information, marital status, military status, national origin, race, religion, sexual orientation, veteran status, or any other legally protected characteristic. We are committed to providing equal employment opportunities and believe in an inclusive workplace. If you require reasonable accommodations to participate in the job application or interview process, please let us know by contacting recruiting@teamsparq.com #LI-REMOTE

• Developing cutting-edge technology and designing scalable and robust backend solutions for our Kaufland Marketplaces is part of your daily work • You take ownership of end-to-end feature development, from design and coding to testing, deployment, and production monitoring • You collaborate closely with different stakeholders and other engineers, communicating effectively to achieve shared objectives • You contribute to the evolution of our development processes and methodologies, exploring new tools and technologies to improve our engineering practices • You write clean, maintainable, high-performance code while following best practices • In pair-programming sessions, you mentor and guide junior engineers, fostering a culture of learning and growth

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.