Logos Messaging Team

The Logos Messaging team is focused on creating communication infrastructure for a freer internet — permissionless, interoperable, and based on user consent. We're building toward a world where anyone can reach anyone on a network that no single entity controls or can take away. We cannot afford to compromise on Privacy, and Eventual Decentralisation is not an option.

Right now we're deep in the hard problems: Bringing decentralised group messaging over MLS to all developers. This is frontier tech work — the protocols we're writing don't have established playbooks, and the tradeoffs we're navigating haven't all been mapped yet.

This is where you come in. We're a small team seeking engineers who have a passion for decentralised chat and who've thought deeply about how these systems work, where they fail, and what it takes to get them right. You'll work directly on our SDK and contribute to the protocols underneath it, with real ownership over work that enables open communication.

Key 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

You will ideally have

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

Bonus points

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

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.

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