Mid-Senior Software Engineer

Smadex is a cutting-edge ad-tech company: we process more than 4,5 million ad requests per second , replying under 100ms (for reference, the Google search engine handles ~76,000 QPS). Every day we generate several TBs of data that need to be processed, analyzed and aggregated, so our real-time components get smarter every day. We need you to help us keep our platform in motion! If you are ready to boost your professional career in the tech world, this is your opportunity. The team You will join our core engineering team, a collaborative group of 8 experienced engineers responsible for maintaining and evolving the real-time bidding (Open-RTB) auction system that powers our entire business. We foster a fast-paced, supportive environment where knowledge sharing is key. We value autonomy and will provide the platform for you to grow your career while solving complex engineering challenges. What are we looking for? We're looking for a knowledgeable Software Engineer who is excited by complex technical challenges. Your success will be measured by your ability to deliver high-quality features , collaborate with the team, while sharing and applying your knowledge effectively. What will you do at Smadex? You will dive into a dynamic environment, tackling short-cycle tasks across the core platform following a "you build it, you run it" philosophy. You will be expected to participate in code reviews, contribute to technical and architectural decisions, and collaborate in a fast-paced environment where every opinion counts. Key Responsibilities Feature Ownership : Design, develop, and implement new features for core products using NodeJS and Java. Quality Assurance : Write clean, efficient, testable code and thoroughly test work locally and in a sophisticated staging environment. Operational Excellence : Monitor deployments and help ensure the stability, reliability and performance of production systems. Agile Collaboration : Collaborate with the team in an agile environment, participating in planning and reporting on progress. Requirements: A Bachelor's degree in Computer Science or a related technical field. 2-4 years of experience in a software engineering role. Hands-on experience with Java or NodeJS. A solid theoretical foundation in data structures, algorithms, and software design principles. A genuine passion for technology and an eagerness to learn and grow professionally. Excellent communication skills in English (written and spoken). Proficiency with Linux, Git, Docker, and Docker-Compose. Experience with testing tools and modern CI/CD frameworks. What Will Make You Stand Out (Bonus Points): Experience with Key-Value stores and in-memory databases (e.g. Redis, Memcached). Familiarity with cloud environments, particularly AWS. Our Tech Stack Languages: NodeJS, Java, Bash, Python Databases: MySQL Cloud & DevOps: AWS, Jenkins, Docker Tools: Git, Jira, Notion What We Offer Integrate a highly motivated, young and dynamic team Great compensation package Top location at the heart of Barcelona with a rooftop terrace, Barbecue, and a fully stocked fridge Great work-life balance: work from home (2 days per week), flexible hours Meal vouchers - Ticket Restaurant monthly allowance Monthly gym allowance: Choose between DiR and Wellhub LinkedIn Learning and training opportunities Monthly TGIF events Regular team-building events Fun and friendly work environment with talented marketers and engineers from over 40 countries And more! If you want to know more about us visit our website Smadex.com , and for a sneak peek of the cool stuff we build check this video out! And, if you are ready to take your career to the next level and tackle engineering challenges at a global scale, we encourage you to apply! Please note that we do NOT provide VISA sponsorship. Candidates without a legal permit to work in Spain won't be considered.