Senior Software Engineer

We are Merlin Digital Partner ! A leading IT and Digital headhunting company who stands out from the crowd, boasting over a decade of experience. We've successfully collaborated and played a pivotal role in the growth of industry heavyweights such as Wallapop, Glovo, Banc Sabadell, and Duracell, among others. Our emphasis lies in people-centric approaches and optimizing the selection processes . Our mission is to revolutionize companies by seamlessly integrating top-tier talent . What sets us apart is our in-depth understanding of each partner (being their best influencer!), addressing not only their needs but also capturing their essence. Our partner is a fast-growing HealthTech company developing connected technologies at the intersection of hardware, embedded systems, IoT, AI and digital health . Their technology transforms everyday environments into intelligent health platforms, enabling seamless and continuous health monitoring. We are currently looking for a Senior Software Engineer (Python) to join their Engineering team and help build the embedded technologies powering the next generation of connected health products. Mission: As a Senior Software Engineer , your mission will be to design and develop the backend systems, cloud infrastructure and APIs powering the company's connected technologies. You will have a key role in building scalable, reliable and secure software that connects devices, AI-driven services and customer-facing applications. Working closely with Product, AI, Embedded and Frontend teams , you will take ownership of solutions from architecture and implementation through deployment and production, helping define the technical foundations of the platform as the company scales. The Role: You will be responsible for: Designing, developing and maintaining scalable backend services , primarily using Python . Building and evolving REST APIs powering web, mobile and IoT applications. Designing and optimizing databases, data models and system integrations . Developing cloud-native services with a strong focus on reliability, performance and scalability. Contributing to cloud infrastructure, deployment pipelines and system monitoring . Improving platform performance, observability and security . Troubleshooting production issues and continuously improving system reliability . Collaborating closely with Product, AI, Embedded and Frontend teams to design and deliver new product capabilities. Participating in software architecture and technical design decisions . Building clean, maintainable and well-tested software following strong engineering practices. Improving development workflows, CI/CD pipelines and code quality . Providing technical guidance and mentoring other engineers through code reviews and knowledge sharing . Continuously evaluating new technologies, tools and engineering best practices. What we need: 5+ years of professional backend software engineering experience . More extensive senior-level experience will be highly valued. Strong professional development experience with Python . Experience working with modern Python backend frameworks such as FastAPI, Django or similar . Solid experience designing, developing and maintaining REST APIs . Experience designing scalable software architectures and contributing to architectural decisions. Strong knowledge of SQL and PostgreSQL , including database and data model design. Experience working with Firebase . Experience deploying and operating applications on cloud platforms such as GCP, Hetzner or similar . Hands-on experience with Docker, Git and CI/CD pipelines . Experience with monitoring, observability and background processing tools , such as Sentry, Celery or similar . Strong understanding of software engineering best practices, including testing, maintainability, code reviews and clean software design . Excellent debugging, analytical and problem-solving skills . Ability to take ownership of technical solutions from design and architecture through deployment and production . Professional English level . Disponibilidad para acudir a oficinas 4-3 días a la semana. Nice to Have Experience with event-driven architectures and technologies such as Kafka, RabbitMQ or MQTT . Experience with Infrastructure as Code (IaC) . Previous experience working with IoT or connected devices . Experience integrating AI or Machine Learning services into production systems. Experience building or operating distributed systems . Previous experience in startups, scale-ups or fast-growing technology companies . A product-oriented mindset and the ability to comfortably collaborate across different engineering disciplines. What we offer: Join a fast-growing HealthTech company building a new generation of intelligent, connected health technologies. Work at the intersection of embedded systems, hardware, IoT, cloud, AI and digital health . Build technologies powering products already used by leading sports organizations and enterprise customers worldwide . Take ownership of high-impact projects , from embedded software development through system integration and production. Collaborate with a talented multidisciplinary team across Hardware, Backend, AI, Data and Product . Have a visible impact on technical and architectural decisions as the platform and engineering organization continue to evolve. Work in a fast-paced environment with a high level of autonomy and ownership . Strong opportunities for professional growth and technical leadership as the company scales internationally. Competitive compensation based on experience.