Senior Jobs in Berlin

What you will do

About Circles

Circles is a radically different kind of moneyissued directly by people secured cryptographically and powered by a decentralized web of trust. Its money as a public good : open transparent and fair by design.

Instead of banks or gatekeepers every user creates their personal money in the form of a Token. Trust connections between users weave these individual currencies into a spendable whole. Our vision is money that belongs to people strengthens communities and feels natural intuitive and fair.

Were a diverse team united by curiosity idealism and pragmatism. We build carefully openly and always with the community in mind. Everything we make is open-source from day one.

About the Role

Were looking for a senior backend developer to design and build the infrastructure that makes Circles a trustworthy payment method in everyday life. Youll build systems to capture and index blockchain events create accessible APIs for developers manage off-chain user data (profiles trust relationships group metadata) and ensure the whole system stays reliableeven when the network behaves unpredictably.

Our stack is rooted primarily in TypeScript C# SQL and occasionally Python and Rust but we choose technologies based on their merits not just habits. Youll be collaborating closely with our smart-contract developers frontend engineers community contributors and designers.

What youll do

Blockchain Data Indexing

Build maintain and evolve our custom Circles blockchain indexer (Nethermind plugin C# / .NET) which ingests and organizes events into PostgreSQL. Ensure it stays consistent even through network disruptions reorganizations and edge-cases.

API & Developer Infrastructure

Develop robust APIs (JSON-RPC / HTTP) that enable wallets community apps explorers and analytics dashboards to reliably query Circles data in real-time.

Web-of-Trust & Pathfinding

Extend and tune our pathfinding service to determine viable token-transfer routes through trust connections. Make complex graph computations accessible via clean APIs to power seamless payments and insights.

Off-chain Data Handling

Manage reliable off-chain storage of user profiles group information and metadata (IPFS-backed). Ensure efficient storage fast retrieval and secure updates.

Developer SDKs

Create and maintain intuitive strongly-typed backend SDKs to support community developers building apps and integrations on Circles.

Reliability & Security

Design robust services that gracefully handle failures spikes in traffic and other real-world scenarios. Implement observability through metrics logs and alerts. Ensure sensitive keys and operations remain secure.

Open Collaboration & Documentation

Write clear documentation share knowledge openly and actively welcome contributions from our community. Your code and documentation will be public and built for transparency.

Initial projects youll dive into

Circles Nethermind Indexer :

Ensuring reliable real-time indexing of blockchain events into PostgreSQL.

Pathfinder Service :

Improving the pathfinder service that computes viable transaction paths through the trust network.

Profiles Backend :

Building efficient secure storage and retrieval mechanisms for off-chain user data (profiles images metadata).

• Server-side SDKs :

Creating easy-to-use SDKs that enable third-party developers to quickly integrate Circles into their own applications.

Who you are

You have several years (5) experience building and operating production-grade backend systems.

Youre strong in TypeScript () and comfortable diving into C# / .NET or willing to quickly learn it.

You have practical experience with SQL (PostgreSQL) and understand how to optimize database performance.

Youve previously worked with blockchain indexing Ethereum JSON-RPC event-driven systems or similarly complex backend architectures.

You build APIs with empathy for the developers who will use themdesigning interfaces that feel natural and easy to reason about.

You thrive in remote autonomous teams taking ownership from design through deployment.

You genuinely care about open-source software and public-good infrastructure.

Nice-to-have (but not required)

Experience with IPFS or decentralized storage.

Experience with community driven projects.

Familiarity with algorithms and graph theory.

Interest in tokenomics decentralization or community-driven economics.

What we value

We look beyond specific skills to find people who are thoughtful builders clear communicators and passionate collaborators. We value pragmatic idealism and curiosity. If youve wrestled with complex systems navigated ambiguity gracefully and thoughtfully made trade-offs youll fit right in.

What we can offer you

At Gnosis we strive to create an inclusive environment that empowers our employees. We believe that our products and services benefit from our diverse backgrounds and experiences and are proud to be an equal opportunity employer : all qualified applicants are considered for positions regardless of race ethnic origin age religion or belief marital status gender identification sexual orientation or physical ability.

Required Experience :

Contract

Key Skills

Business Intelligence,Bidding,Accounts Assistant Credit Control,Account Development,Content Development,Lab Testing

Employment Type : Full-Time

Experience : years

Vacancy : 1