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.

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