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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: https://logos.co/manifesto/
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.
Hiring process
Interview with our Talent team
Interview with Team Member (Technical Life Story)
Interview with Team Lead / Pair Programming Session (Technical Discussion )
The expected compensation range for this role is negotiable, dependent on how we assess your skills and experience throughout our interview process. We are happy to pay in any mix of fiat/crypto.
Qualifications: Remote (Worldwide), Rust, Cryptographic primitives, MLS (Message Layer Security), OpenMLS library (bonus), P2P transport layers (Waku, libp2p) (bonus), Web3, Blockchains, Open protocols, Deep familiarity with instant messaging systems (Signal, Matrix, XMPP), Experience with decentralised computing, Peer-to-peer systems, Distributed networks, Decentralised application infrastructure, Secure private messaging principles, Forward secrecy, Post-compromise security, Key management, Reliable code, Maintainable code, Post-Quantum Cryptography (bonus), Authored/contributed to open specification (bonus), Open source organisation experience (bonus), Passion for decentralised chat, Strong alignment to principles, Asynchronous work
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