Senior Python Developer

The company provides devices and subscription-based infrastructure for a connected-device ecosystem used by retail and hospitality businesses across Europe.

• At least 4-5 years of commercial experience in backend development.
• Proven experience designing and building distributed systems, cloud-based applications or scalable backend services.
• Strong Python skills and hands-on experience with FastAPI, Django, Flask or a similar framework.
• Experience working with relational databases, especially MySQL, and non-relational databases, especially Redis.
• Good knowledge of MQTT, including QoS, retained messages and broker configuration with tools such as Mosquitto, HiveMQ or EMQX.
• Solid understanding of networking concepts, including TCP/IP, routing and load balancing.
• Experience with Docker and Git.
• Experience working in a cloud environment: AWS, GCP or Azure.
• Strong focus on clean code, automated testing, code quality and maintainable solutions.
• Technical university degree in Computer Science, Software Engineering or a related field.
• English at minimum B2 level, allowing comfortable day-to-day communication.
• Openness to hybrid work from the office (2-3 days per week) in Wrocław.

• Build and develop backend features in Python.
• Improve the performance and reliability of services that support smartwatches, tablets and mobile communication.
• Investigate and fix connectivity issues, including delays, unstable device connections and TCP disconnects.
• Maintain and develop the communication layer between devices and backend services.
• Build and support integrations with external customer systems.
• Work with MQTT communication, including QoS settings, retained messages and broker configuration.
• Write clean, maintainable code and follow good engineering practices.
• Take part in code reviews and write automated tests to maintain strong code quality.
• Work closely with the Tech Lead and Android Developers on product and technical decisions.
• Help improve backend architecture as the platform, number of devices and customer integrations grow.

Candidates must be open to hybrid work from the office (2-3 days per week) in Wrocław, as the team is based there. English language proficiency at minimum B2 level is required.