Staff Software Engineer (Messaging Protocol)

Overview

Job Description

Responsibilities

• - Build and maintain XMTP’s mobile SDKs, designing and implementing Rust-to-mobile bindings for high-performance, reliable developer experiences across iOS, Android, and React Native
• - Advance the encrypted messaging protocol (built on Rust and OpenMLS), from multi-device sync and performant content types to scaling from hundreds to tens of thousands of participants
• - Collaborate with teammates to design systems, evaluate trade-offs, and deliver improvements, balancing security, scalability, and efficiency
• - Engage with the open source community, ensuring XMTP SDKs are intuitive, well-supported, and empowering the next generation of privacy-preserving apps

Required Skills

• - Minimum of 10+ years of professional experience as a staff-level software engineer
• - Expertise in mobile development with one or more of Kotlin, Swift, React Native, or C++, including delivering production-ready SDKs or apps
• - Solid experience with Rust, or a strong interest in learning Rust and building Rust-to-mobile bindings
• - Experience building and maintaining communication protocols, SDKs, or developer-facing APIs with an emphasis on performance, scalability, and security
• - A well-rounded, ''T-shaped'' expertise profile is preferred
• - Bonus points if you have prior experience with Messaging Layer Security
• - A proven aptitude for adversarial systems design, including identifying and mitigating potential security risks
• - Prior involvement in open source SDK projects and public communications

Benefits

• - Competitive compensation package, Base + Equity
• - Remote-first environment with semi-yearly gatherings to connect IRL
• - Fully paid Medical, Dental, Vision insurance in the US
• - Parental Leave
• - IT Equipment and WFH setup
• - Monthly Wellness and Lifestyle stipend
• - Personal assistant
• - Unlimited time off