Senior Backend Developer

Do you want to shape the future?

We are looking for an experienced Senior Backend Developer to join our team and take an active part in the creation and development of our systems. We expect a passion for technology, the ability to solve complex problems, and a willingness to work with both modern and existing solutions.

• Minimum 5 years of commercial programming experience.
• Strong proficiency in C++ and C# and .NET (including modern .NET versions).
• Good knowledge of Python.
• Practical knowledge of MS Windows and Linux operating systems.
• Ability to create simple web UI using HTML, CSS, and JavaScript, with a basic understanding of web UI frameworks (e.g., React, Vue, Angular, or Razor Pages/Blazor).

• Experience in designing and implementing RESTful Web APIs.
• Knowledge of fundamental architectural patterns and the ability to apply them in practice.
• Ability and willingness to work with legacy code, including its refactoring and modernization.
• Experience in concurrent and multi-threaded programming, including async/await and task-based programming in .NET.

• Experience with relational and lightweight databases, such as Postgre
  
  SQL or SQLite.
• Networking and Web Applications.
• Practical knowledge of network protocols: HTTP, Web Socket, RTSP.
• Deep understanding of web application mechanics (session management, authorization, headers,cookies).
• Knowledge of network configurations and mechanisms, such as reverse proxy and load balancing.

• Proven knowledge of application security: TLS, cryptography, authorization, authentication (OAuth2/ OpenID Connect), and Single Sign-On (SSO).
• Familiarity with issues related to cybersecurity and data protection (GDPR).

• Practical knowledge of CI/CD processes and version control systems (preferably Git).
• Experience with containerization (Docker).
• Experience working in agile methodologies (Scrum/Kanban).
• Ability to write unit tests (e.g., using Google Test, xUnit, NUnit, MSTest).
• Experience with profiling and static analysis / code quality tools (e.g. Sonar Qube, .NET analyzers).

• Very good command of English (min.
  
  B2) and Polish (min.
  
  C2), spoken and written.
• Analytical thinking and independent problem-solving skills.

• Knowledge of ONVIF (device/protocol specification) for IP video devices.
• Knowledge of video/audio streaming protocols and codecs (e.g., RTP, RTSP, H.264, H.265).
• Practical ability to work with LLM agents.

• International projects.
• Individual development path and close-knit team.
• Friendly and casual atmosphere of work (no open space, no dress code).
• Permanent contract.
• Hybrid model of work; in some cases fully remote might be considered.
• Private healthcare (Luxmed) & Multisport card - co-financed by Teleste.
• Flexible working hours (start time between 7:00 a.m. and 10:00 a.m.).