Logos is a movement supporting the development of the decentralised web, building technologies that lay the foundations for a freer internet where communities can evolve into network states. The Logos Messaging team focuses on creating permissionless, interoperable, and user-consent-based communication infrastructure, aiming for a world where anyone can communicate on a network no single entity controls. The team is currently tackling hard problems like bringing decentralised group messaging over MLS to all developers, working on frontier tech with no established playbooks. They seek engineers passionate about decentralised chat to work directly on their SDK and contribute to underlying protocols, with real ownership over enabling open communication.
Responsibilities
- Implement our messaging protocols in our reference SDK, translating protocol specs into reliable, production-quality Rust
- Own the API design and developer experience of the SDK surface — abstractions, ergonomics, and developer-facing documentation
- Contribute to messaging protocol specifications alongside the team
- As a member of a small team, you'll wear many hats — picking up problems outside your immediate lane, learning as you go, and growing with the team
- Write clear technical documentation and participate in async design discussions with collaborators across the project
Requirements
- Deep familiarity with real-world instant messaging systems - you've worked on, contributed to, or spent serious time understanding how systems like Signal, Matrix, XMPP, or similar are built, where they make tradeoffs, and where they struggle
- Experience with decentralised computing - peer-to-peer systems, distributed networks, or decentralised application infrastructure
- Comfort working directly with cryptographic primitives - signatures, ciphers, and key exchanges and an understanding of secure private messaging principles such as forward secrecy, post-compromise security, and key management
- Solid Rust experience: comfortable writing reliable, maintainable code in a team setting
- Previous experience with Web3, blockchains, open protocols, and the values that underpin them
- A strong alignment to our principles
Nice to have
- Experience with Post-Quantum Cryptography and its application to secure messaging
- Experience with MLS (Message Layer Security / RFC 9420) or the OpenMLS library specifically
- You've authored or contributed to an open specification
- Familiarity with P2P transport layers such as Waku or libp2p
- Experience working for an open source organisation
- Comfortable working remotely and asynchronously
Benefits
- We are happy to pay in any mix of fiat/crypto
Additional details
- Don't worry if you don't meet all of these criteria — we'd still love to hear from you if you think you'd be a great fit. Just explain why in your cover letter.
- Hiring process: Interview with our Talent team, Interview with Team Member (Technical Life Story), Interview with Team Lead / Pair Programming Session (Technical Discussion), Interview with Program Lead (Culture Fit)
- Originally posted on Himalayas
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