Job Title: Backend Engineer Location: Barcelona (on-site) About the job: We are an ambitious and rapidly evolving cybersecurity company based in Barcelona and we are seeking a skilled and motivated Backend Engineer to join our team. As a core part of our backend development efforts, you will work on building and maintaining a scalable, microservices-based architecture. You will collaborate closely with cross-functional teams to design, develop, and deploy robust backend systems, ensuring optimal performance and responsiveness. What you will do: Design, develop, and maintain backend services using modern technologies Work with SQL and NoSQL databases Develop and deploy containerized applications using Docker Implement and maintain microservices architecture Improve and debug an already running system to ensure stability and performance Optimize system performance and troubleshoot production issues Collaborate with Frontend developers, DevOps, and other stakeholders to deliver high-quality solutions Ensure high-quality code standards and enhance code quality through testing and peer reviews Take ownership of end-to-end development processes, including requirement analysis, design, implementation, testing, and deployment What you will bring: 5 years of experience in backend development, with a proven track record of delivering high-quality, scalable solutions Strong, hands-on programming skills with a focus on Python Proficiency in C programming Experience with internal OS development Familiarity with DevOps practices and on-prem infrastructure is a plus. Experience with microservices architecture Strong understanding of system architecture principles, with the ability to design and maintain efficient, scalable backend systems Proficiency in both SQL and NoSQL databases (e.g., PostgreSQL, MongoDB) Hands-on experience with Docker for containerization Working knowledge of Linux OS Ability to work independently and take ownership of tasks from start to finish What we offer: For us, people come first and our highly experienced team of professionals is bringing to life their vision of the future of cybersecurity. If you Join us, you will have the unique opportunity to be a part of our growing and ambitious start-up. You will enjoy: Competitive salary in the sector (based on your experience/skills) Private health insurance Food allowance and flexible compensation Flexible office working hours Beautiful office in Barcelona Fully stocked kitchen (coffee, organic fruits, snacks, and beverages) Team-building events and professional growth opportunities We are proud to be an equal opportunity employer and consider all qualified applicants for employment without regard to race, colour, religion, age, sex, sexual orientation, gender, gender identity, national origin, disability, veteran status or any other legally protected characteristic.