Archon Labs - Blockchain Developer

As a Blockchain Developer at deCircle, you build data-driven systems and smart contracts that power risk analytics and allocation workflows in decentralized finance. You work across on-chain and off-chain data, deliver secure Solidity contracts, and ship reliable services that integrate blockchain data with internal platforms.

What you'll do

• Extract, normalize, and store data from Ethereum, L2s such as Arbitrum and Solana, plus relevant protocols.
• Design and implement secure Solidity/EVM contracts to enable data adapters, allocation validation, and rule evaluation.
• Build and maintain services that integrate on-chain data to internal systems and external APIs.
• Develop robust, testable logic for event ingestion, data orchestration, and state transitions.
• Implement access controls, pausability, monitoring, and on-chain and off-chain audit trails.
• Collaborate with product and engineering teams to design resilient, auditable, and automated financial workflows.
• Contribute to shared libraries and improve tooling for data ingestion, validation, and analysis.

What you bring

• Strong Python proficiency for data processing, backend services, and automation.
• Extensive hands-on experience with Solidity, EVM tooling, and DeFi integrations.
• Practical use of The Graph (subgraphs), Alchemy or Infura, Dune or Flipside, or custom indexing tools.
• Understanding of decentralized data models, indexing, and event-driven architectures.
• A track record of writing clean, maintainable, and secure code with thorough tests and reviews.
• Experience owning deliverables end-to-end and working in distributed, async teams.
• Background in fintech, data engineering, or DeFi infrastructure.
• Clear, structured communication and attention to detail.
• Strong ownership, ability to break down complex problems and deliver independently while being a reliable team member.
• A proactive, self-directed mindset suited to a fast-evolving technical environment.

Nice to have

• Proficiency in C++ or Java for performance-sensitive components.
• Experience with formal verification, bug bounty programs, or audit coordination.
• Familiarity with time-series and relational data models.
• Exposure to infrastructure basics such as containers and Infrastructure as Code, for example Docker and Terraform; knowledge of Kubernetes is a plus.