[Hiring] Senior Blockchain Backend Developer — Node.js / EVM (Remote, Europe)

Building backend infrastructure connecting a production platform to EVM-compatible blockchain networks — RPC communication, event indexing, transaction monitoring, on-chain/off-chain sync. English fluency required.

Requirements:

• Minimum 5 YOE
• Real experience connecting backend services to an EVM-compatible blockchain
• Strong Node.js and TypeScript
• Strong JSON-RPC understanding, HTTP or WebSocket RPC providers
• Processing smart-contract events/logs, decoding transaction receipts, understanding block numbers, tx hashes, block hashes, log indexes, confirmations
• Storing blockchain data in a relational database, idempotency and duplicate prevention
• Background workers/queues, async processing, retries and failure handling
• Building secure, documented APIs; strong debugging; writes automated tests; can extend an existing codebase
• Collaborates across engineering roles with clear communication

€5000-7500/month, long-term contract. Must have actually shipped this before.

DM with: Resume, LinkedIn, years of backend + blockchain experience, GitHub/portfolio, timezone + availability.

Must be based in Europe.