Senior Back End Developer (with Matrix)

Svitla Systems Inc. is looking for a Senior Back End Developer with Matrix for a full-time position (40 hours per week).

Our client is a digital identity platform that empowers individuals to own and manage their personal information online securely. It allows users to create a portable digital identity that they fully control, eliminating the need for multiple usernames and passwords across different platforms.​ Users can obtain verifications from trusted entities, such as banks or educational institutions, to authenticate aspects of their identity, enhancing trust and security in digital interactions.​ The platform offers encrypted messaging and document sharing, ensuring users can communicate and exchange information safely. The solution includes a digital wallet feature, enabling users to manage various digital assets and currencies within the same secure environment.

The project involves rebuilding the messaging system using the Matrix protocol – an open, secure, and decentralized standard for real-time communication. The client is looking for a Principal Engineer with deep experience in the Matrix ecosystem to lead the backend development and integration of their new messaging system. This role will focus on backend infrastructure and protocol-level integration, tackling key challenges such as token handling, session reliability, federation stability, and secure communication.

Requirements:

• 8+ years of experience in software engineering. 
• 4+ years of hands-on experience with the Matrix protocol (mandatory).
• Deep knowledge of Matrix APIs, federation, and encryption mechanisms.
• Solid understanding of backend development with Python, Go, or Node.js.

• Strong knowledge of secure communication principles and real-time systems.

   

Nice to Have

• Experience with other decentralized communication protocols.
• Contributions to the Matrix ecosystem.
• Experience with bridging services (e.g., IRC, Slack, Discord).
• Understanding of decentralized identity (DID, SSI).
• Open-source project involvement or standards body participation (IETF, W3C).

Responsibilities:

• Lead Matrix protocol backend integration and ongoing maintenance.
• Work with Matrix server implementations such as Synapse or Dendrite.
• Deeply understand and apply Matrix APIs, federation, and authentication flows.
• Integrate Matrix into the backend stack (Python, Go, Node.js).
• Address token handling, session management, reliability, and scaling.
• Ensure a secure and robust communication infrastructure.