We are seeking an experienced Blockchain Developer with strong Node.js expertise to join our team. The role focuses on integrating with multiple blockchain networks and building reliable backend services that process, store, and serve large volumes of blockchain data.
Requirements
Blockchain & Web3
- Experience working with blockchains based on different state and transaction models, including: UTXO-based blockchains (e.g. Bitcoin); account-based blockchains (e.g. Ethereum, Cosmos, Solana)
- Practical experience with major blockchain ecosystems and their tooling.
- Strong understanding of core blockchain concepts:
- Hands-on experience working with RPC APIs of major blockchain networks.
- Understanding of smart contracts and execution environments from an integration perspective, including transaction invocation, event/log processing, and error handling (writing or auditing smart contracts is not required).
- Strong understanding of cryptographic concepts and types, algorithms, and their applications.
Backend Development
- Strong experience building backend services with NodeJs
- Long-running processes (blockchain listeners, indexers) & background jobs and task queues
- Proficiency with relational databases, particularly PostgreSQL.
- Good understanding of API design and service-to-service communication.
Data Architecture
- Strong understanding of data architecture for blockchain-based systems, including:
- designing schemas for large, append-heavy datasets
- handling chain reorgs, idempotent writes, and data backfilling
- optimizing data storage and query patterns for both operational and analytical use cases
- Ability to select appropriate data structures and algorithms with future usage and scalability in mind.
Infrastructure & Operations
- Working knowledge of DevOps practices sufficient to collaborate effectively with infrastructure teams.
- Experience using Docker and containerized environments.
- Familiarity with Kubernetes (K8s) and modern deployment workflows.
- The role does not involve ownership of infrastructure.
Additional Qualifications
- Strong problem-solving skills and ability to work effectively in a collaborative team environment.
- Proactive attitude toward learning and staying current with blockchain technologies.
- Experience working in Agile development processes.
Responsibilities - Implementing modern BE applications and infrastructure in a microservices architecture, utilizing the latest technologies and development practices.
- Deep diving into the latest blockchain technology, and becoming an expert in the fundamentals, protocols, and features of the blockchains.
- Collaborating effectively with other developers, engineers, and other roles while showcasing independent problem-solving abilities
Portugal only
United States only
