Senior Software Engineer (Python)

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 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.