Founded in 2020, Synonym is preparing for the post-Bitcoin economy by designing and developing an ecosystem of products and protocols that includes Pubky, Bitkit, and Blocktank. We empower individuals to take control and ownership of their digital lives through digital autonomy, privacy, and open-source technology.

About the Role

We're seeking a Senior Rust Developer to join our growing Pubky team. You will play a vital role in designing, building, and maintaining our core products, with a particular focus on Pubky Core and Pubky Nexus. This role is ideal for a self-driven builder who is ready to contribute to high-impact projects, uphold code quality, and shape core product development.

• Contract type: Full-time
• Location: Remote only
• Salary: Based on experience, be prepared to communicate your requirements

Responsibilities

• Design & Development: Architect, develop, and maintain robust Rust-based solutions for our core products and protocols.
• Integration: Collaborate with product, UX, QA, and engineering teammates to ship new features and improvements into existing systems.
• Code Quality: Perform code reviews, implement best practices, and maintain high standards of code quality and documentation.
• Scalability & Performance: Optimize applications for speed, reliability, and efficient resource usage.
• Innovation: Stay informed about emerging libraries, tools, and industry trends, and proactively suggest new approaches.
• Security & Reliability: Help protect user data and maintain system integrity across our products and services.

Skills and Qualifications

• Problem-Solving Mindset: Ability to break down complex challenges into manageable tasks and deliver scalable solutions.
• Expertise in Rust: Proven experience building production-grade applications or systems in Rust.
• Systems Programming: Comfortable working with low-level systems, concurrency, and performance optimization.
• Data & APIs: Familiarity with database management, RESTful APIs, and related technologies.
• Collaboration: Strong communication skills and the ability to work effectively in a fully remote team setting.
• AI-Assisted Engineering: Comfortable using LLM-based coding tools in daily workflow. Ability to critically evaluate AI-generated code for correctness, security, and performance.

Bonus Skills

• Cryptography: Practical knowledge of cryptographic techniques, protocols, and secure data handling.
• Server Protection: Experience building secure systems, protecting servers from threats, and designing robust access controls.
• Decentralized / P2P Systems: Exposure to peer-to-peer architectures and protocols.
• Blockchain / Bitcoin: Experience with Bitcoin or other blockchain technologies.
• Decentralized Social Technologies: Prior work on decentralized or federated social platforms such as Nostr, Mastodon, or Bluesky.

Why Join Us?

• Impactful Work: Play a key role in shaping next-generation technologies that empower individuals and communities.
• Growth & Ownership: Enjoy the flexibility to define your role, innovate, and lead initiatives.
• Cutting-Edge Environment: Collaborate with a forward-thinking, decentralized team working on Bitcoin and peer-to-peer ecosystems.
• Remote Culture: Work from anywhere with flexible hours while we prioritize productivity and well-being.
• Generous Time Off: 28 vacation days per year.

Founded in 2020, Synonym is building the world's first digital free-market society, including any necessary R&D required to deliver "The Atomic Economy." The Atomic Economy is a civic-engineering initiative to replace traditional institutions with open protocols and products that empower individuals.

About the Role

We're seeking a DevOps Engineer to join our growing team. You will play a vital role in architecting, managing, and improving the infrastructure behind our products, with a focus on scalability, reliability, security, and operational excellence. This role is ideal for a self-driven builder who is ready to take ownership as the company's sole DevOps resource and contribute to high-impact projects across our platform.

• Contract type: Full-time
• Location: Remote only
• Salary: Based on experience, be prepared to communicate your requirements

Responsibilities

• Bring our infrastructure to the next level.
• Manage and optimise cloud infrastructure on Google Cloud Platform.
• Bullet-proof applications in case of high demand and DDoS attacks.
• Implement monitoring, logging, alerting, and tracing solutions.
• Collaborate with developers to improve deployment practices and system stability.
• Troubleshoot and resolve issues related to infrastructure, deployments, and performance.
• Implement and improve security measures and practices related to our internal applications.
• Create and maintain documentation for infrastructure, configurations, and processes.
• Facilitate scaling solutions for our growing mobile and web applications.
• Design, implement, and maintain CI/CD pipelines.
• Participate in an on-call rotation for incident response and critical system support.

Skills and Qualifications

• DevOps experience: 3 years of experience as a DevOps engineer.
• Ownership: Capable of independently architecting, managing, and improving our infrastructure as the sole DevOps resource in the company.
• Cloud platforms: 2+ years of demonstrated ability working within and building on a cloud platform, preferably Google Cloud Platform.
• Systems administration: Strong Linux/Unix system administration knowledge (e.g. Ubuntu, Debian, Alpine), including Bash scripting.
• Networking & security: Solid understanding of network protocols, IP networking, and network security, including DDoS prevention.
• Infrastructure tooling: You talk CI/CD, Docker, VPNs, nginx, configuration management, monitoring, and firewall configurations fluently.
• Problem-solving: Excellent problem-solving skills and the ability to troubleshoot complex systems and networks.
• Communication: Strong communication skills to collaborate effectively with development, operations, and other cross-functional teams.
• Infrastructure as Code: Experience with IaC tools such as Terraform and Terragrunt.
• Provisioning: Experience with provisioning tools like Ansible.
• Monitoring: Experience with monitoring tools such as the Prometheus stack.
• Programming: Experience programming in at least one of the following languages: Rust, JavaScript, or TypeScript.

Bonus Skills

Experience with: Ansible, GitHub Actions, Prometheus, WireGuard, iptables, SELinux, virtualisation, PostgreSQL, Terraform, Terragrunt, Redis, Neo4j, and Docker.

Why Join Us?

• Impactful Work: Play a key role in shaping next-generation technologies that empower individuals and communities.
• Growth & Ownership: Enjoy the flexibility to define your role, innovate, and lead initiatives.
• Cutting-Edge Environment: Collaborate with a forward-thinking, decentralized team working on Bitcoin and peer-to-peer ecosystems.
• Remote Culture: Work from anywhere with flexible hours while we prioritize productivity and well-being.
• Generous Time Off: 28 vacation days per year.

Founded in 2020, Synonym is preparing for the post-Bitcoin economy by designing and developing an ecosystem of products and protocols that includes Pubky, Bitkit, Blocktank, and now Atomicity. Synonym empowers individuals to take control and ownership of their digital lives. We are committed to the principles of digital autonomy, privacy, and open-source technology.

Synonym is an entirely remote team working to bring new integrated products to open source protocols and cutting-edge peer-to-peer technology.

About the Role

We are seeking a Senior Rust Engineer with a strong cryptography background to join our team and contribute to the implementation of Atomicity, our open protocol for peer-to-peer mutual credit issuance, settlement, and routing of trusted payments.

Atomicity is currently in the research and design phase. It combines several Synonym primitives (Pkarr for key-based identity, Pubky Core for the semantic social graph) with an Offset-like mutual credit model. The goal is to enable web-of-trust based credit channels where users can issue, transfer, route, and settle debts in any denomination, with Bitcoin as the underlying settlement rails.

This position is for an engineer who is equally comfortable reading a cryptography paper, writing a clean Rust implementation of it, and reasoning about how it composes with the rest of the system.

• Contract type: Full-time
• Location: Remote only
• Salary: Based on experience, be prepared to communicate your requirements

Responsibilities

• Cryptographic Design: Design and document the cryptographic primitives behind Atomicity, including credit note formats, signature schemes, hash chains, commitment schemes, and key binding to Pkarr identities.
• Design & Development: Architect, develop, and maintain robust Rust-based solutions for our core products and protocols.
• Integration: Work with the rest of the Atomicity team to wire the cryptographic layer into the routing, settlement, and identity components, and with the wider Synonym stack (Pubky Core, Bitkit, Paykit).
• Innovation: Stay informed about emerging libraries and industry trends; proactively suggest and implement improvements or new approaches.
• Security & Reliability: Work closely to protect user data and maintain system integrity.

Skills and Qualifications

• Specifications: Comfortable reading RFCs and academic papers, and writing precise, implementable specifications.
• Problem-Solving Mindset: Ability to break down complex challenges into manageable tasks and deliver scalable solutions.
• Expertise in Rust: Proven experience building production-grade applications or systems in Rust.
• Systems Programming: Comfortable working with low-level systems, concurrency, and performance optimization.
• Collaboration: Strong communication skills and the ability to work effectively in a fully remote team setting.
• AI-Assisted Engineering: Comfortable using LLM-based coding tools in daily workflow. Ability to critically evaluate AI-generated code for correctness, security, and performance.

Bonus Skills

• Server Protection: Experience building secure systems, protecting servers from potential threats, and designing robust access controls.
• Decentralized / P2P Systems: Exposure to peer-to-peer architectures and protocols.
• Blockchain / Bitcoin: Experience with Bitcoin or other blockchain technologies.
• Security Auditing: Prior experience auditing cryptographic code or coordinating external audits.

Why Join Us?

• Impactful Work: Play a key role in shaping next-generation technologies that empower individuals and communities.
• Growth & Ownership: Enjoy the flexibility to define your role, innovate, and lead initiatives.
• Cutting-Edge Environment: Collaborate with a forward-thinking, decentralized team working on Bitcoin and peer-to-peer ecosystems.
• Remote Culture: Work from anywhere with flexible hours. We prioritize productivity and well-being.
• Generous Time Off: 28 vacation days per year.

Founded in 2020, Synonym is preparing for the post-Bitcoin economy by designing and developing an ecosystem of products and protocols that includes Pubky, Bitkit, Blocktank, and now Atomicity. Synonym empowers individuals to take control and ownership of their digital lives. We are committed to the principles of digital autonomy, privacy, and open-source technology.

Synonym is an entirely remote team working to bring new integrated products to open source protocols and cutting-edge peer-to-peer technology.

About the Role

We are seeking a Senior Rust Engineer with a background in Distributed Systems & Graph Routing to join our team and contribute to the implementation of Atomicity, our open protocol for peer-to-peer mutual credit issuance, settlement, and routing of trusted payments.

In Atomicity, value flows across a web of trust: every user defines credit limits to a set of peers, and payments are routed multi-hop across this graph until a settlement path is found. The system has no central coordinator. Discovery, routing, state replication, and decentralized commit all happen between peers. Getting these distributed systems mechanics right is what makes Atomicity practical at scale.

This position is for an engineer who thinks naturally about partial failures, eventual consistency, gossip, graph algorithms, and how to make a decentralized system actually converge.

• Contract type: Full-time
• Location: Remote only
• Salary: Based on experience, be prepared to communicate your requirements

Responsibilities

• Routing Engine: Design and implement the multi-hop routing layer over the Atomicity web of trust, including pathfinding, capacity/credit-aware routing, fee modeling, and fallback strategies.
• Graph & State Management: Build the local view of the trust and credit graph, with efficient updates, partial synchronization, and resilience to stale or adversarial information.
• Decentralized Commit: Implement the multi-hop commit flow so that a payment either fully completes or fully unwinds, even in the presence of node failures, slow links, or hostile peers.
• P2P Infrastructure: Work with Pkarr, Pubky, and Mainline DHT-based discovery to make peers findable, reachable, and resilient under churn.
• Scalability & Performance: Optimize routing and state propagation for low-latency operation on mobile and desktop clients, with bounded memory and bandwidth.
• Innovation: Stay informed about research on payment routing (Lightning routing, trampoline, blinded paths), mutual credit pathfinding, DHTs, and gossip-based systems, and bring relevant ideas back into Atomicity.

Skills and Qualifications

• Expertise in Rust: Proven experience building production-grade systems in Rust, ideally including networked or financial components.
• Distributed Systems: Strong working knowledge of partial failures, eventual consistency, replication, gossip, leader-less coordination, and the failure modes that come with them.
• Graph Algorithms: Practical experience with pathfinding (Dijkstra, A*, k-shortest-paths), graph data structures, and constraint-aware routing (capacities, fees, trust limits).
• Systems Programming: Comfortable with concurrency, async runtimes, low-level performance work, and careful state management.
• Collaboration: Strong communication skills and the ability to work effectively in a fully remote team setting.
• AI-Assisted Engineering: Comfortable using LLM-based coding tools in daily workflow. Ability to critically evaluate AI-generated code for correctness, security, and performance.

Bonus Skills

• P2P Protocols: Direct experience with DHTs (Mainline, Kademlia), libp2p, or building custom P2P transports.
• Payment Routing: Familiarity with Lightning routing, trampoline payments, blinded paths, or HTLC-based multi-hop flows.
• Adversarial Robustness: Experience with Sybil resistance, eclipse attacks, spam mitigation, and incentive design in P2P systems.
• Mutual Credit: Familiarity with ecash, Offset, Trustlines, or other mutual credit / IOU systems.
• Decentralized / P2P Systems: Exposure to peer-to-peer architectures, DHTs, gossip protocols, and libp2p.
• Cryptography: Working knowledge of signatures, hash chains, and HTLC / PTLC mechanics.

Why Join Us?

• Impactful Work: Play a key role in shaping next-generation technologies that empower individuals and communities.
• Growth & Ownership: Enjoy the flexibility to define your role, innovate, and lead initiatives.
• Cutting-Edge Environment: Collaborate with a forward-thinking, decentralized team working on Bitcoin and peer-to-peer ecosystems.
• Remote Culture: Work from anywhere with flexible hours. We prioritize productivity and well-being.
• Generous Time Off: 28 vacation days per year.

Founded in 2020, Synonym is preparing for the post-Bitcoin economy by designing and developing an ecosystem of products and protocols that includes Pubky, Bitkit, Blocktank, and now Atomicity. Synonym empowers individuals to take control and ownership of their digital lives. We are committed to the principles of digital autonomy, privacy, and open-source technology.

Synonym is an entirely remote team working to bring new integrated products to open source protocols and cutting-edge peer-to-peer technology.

About the Role

We are seeking a Senior Rust Engineer with a strong payment layer background to join our team and contribute to the implementation of Atomicity, our open protocol for peer-to-peer mutual credit issuance, settlement, and routing of trusted payments.

Atomicity treats credit as a settlement method, alongside Bitcoin on-chain and Lightning. Building it well requires deep familiarity with how real-world payment layers actually behave: HTLCs and timelocks, channel states, fee mechanics, refund and recovery flows, and atomic swaps. Whether your background is Lightning, on-chain Bitcoin, or any other payment / L2 protocol, we want someone who has shipped payment code in production and knows where the sharp edges are.

This position is for an engineer who is comfortable thinking in terms of channels, states, timeouts, and adversarial counterparties, and who can translate that intuition into clean Rust code.

• Contract type: Full-time
• Location: Remote only
• Salary: Based on experience, be prepared to communicate your requirements

Responsibilities

• Settlement Design: Design and implement the settlement layer of Atomicity, including credit channels, state transitions, timeouts, refund paths, and integration with Bitcoin as underlying settlement rails.
• Channel & State Engineering: Build robust state machines for credit channels (open, update, dispute, close), with attention to failure modes, partial states, and recovery.
• Payment Coordination: Work with the Paykit team to integrate Atomicity as a payment / settlement method alongside on-chain Bitcoin, including proof generation and verification flows.
• Integration: Coordinate with the Blocktank, Bitkit, and Lightning teams (LDK) to make sure Atomicity composes cleanly with existing Synonym payment infrastructure.
• Reliability & Recovery: Treat money and credit as critical. Design clear failure modes, robust retries, idempotent flows, and recovery procedures for stuck or partial payments.
• Innovation: Stay informed about payment protocol research (PTLCs, atomic swaps, payment routing) and bring relevant ideas back into Atomicity.

Skills and Qualifications

• Expertise in Rust: Proven experience building production-grade systems in Rust, ideally including networked or financial components.
• Payment Layer Experience: Hands-on experience building, integrating, or operating a payment protocol in production. This can be Lightning, atomic swaps, or another L2 / payment system.
• State Machines & Concurrency: Strong intuition for protocol state machines, async runtimes, idempotency, and edge cases (timeouts, retries, partial failures).
• Money-Grade Engineering: Deep care for correctness, auditability, and recoverability when value is at stake.
• Data & APIs: Familiarity with database management, persistent state, and RPC / API design for payment flows.
• Collaboration: Strong communication skills and the ability to work effectively in a fully remote team setting.
• AI-Assisted Engineering: Comfortable using LLM-based coding tools in daily workflow. Ability to critically evaluate AI-generated code for correctness, security, and performance.

Bonus Skills

• Lightning Network: Practical experience with LDK, LND, CLN, or Eclair, and a working understanding of BOLT specs, HTLCs, and routing.
• Atomic Swaps & HTLC Patterns: Prior work on submarine swaps, reverse swaps, Boltz-like services, or cross-chain atomic swaps.
• Other Payment Layers: Experience with other L2s, payment channel networks, or payment-oriented blockchains (the more battle scars, the better).
• Mutual Credit: Familiarity with ecash, Offset, Trustlines, or other mutual credit / IOU systems.
• Decentralized / P2P Systems: Exposure to peer-to-peer architectures, DHTs, gossip protocols, and libp2p.
• Cryptography: Working knowledge of signatures, hash chains, and HTLC / PTLC mechanics.

Why Join Us?

• Impactful Work: Play a key role in shaping next-generation technologies that empower individuals and communities.
• Growth & Ownership: Enjoy the flexibility to define your role, innovate, and lead initiatives.
• Cutting-Edge Environment: Collaborate with a forward-thinking, decentralized team working on Bitcoin and peer-to-peer ecosystems.
• Remote Culture: Work from anywhere with flexible hours. We prioritize productivity and well-being.
• Generous Time Off: 28 vacation days per year.