Staff Software Engineer (Messaging Protocol)

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Requirements:

• Minimum of 10+ years of professional experience as a software engineer, staff level.
• Expertise in Rust and at least one of the following: Kotlin, Swift, C++.
• Extensive experience designing, developing, and maintaining communication protocols with an emphasis on performance, scalability, and security.
• Understanding of encryption algorithms (e.g., AES, RSA), key exchange protocols (e.g., Diffie-Hellman), and secure messaging protocols (e.g., Signal Protocol, PGP).
• A proven aptitude for adversarial systems design, including identifying and mitigating potential security risks.
• Prior involvement in open-source SDK projects and public communications.

Responsibilities:

• Design, build, and maintain XMTP, our E2EE messaging protocol.
• Extend our encrypted group chat protocol to work for 1:1 conversations.
• Determine how to share user state between devices in a privacy-preserving way.
• Designing a protocol to share whether or not a message was sent by a given user with third party servers in a trust-minimized way
• Collaborate closely with other engineers, developers, and stakeholders to help our small team build with confidence and deliver with velocity.
• Engage in open-source communities and events, representing Ephemera effectively in public forums.
• Evaluate and recommend trade-offs in our development plans and system design, considering factors such as security, scalability, efficiency, and cost.