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.