Blockchain Engineer

hace 6 días

Barcelona, España Bnka A tiempo completo

Blockchain Engineer – Mainnet, Wallets & Regulatory Integrations

On-site / Hybrid – Barcelona | Fintech & Crypto Infrastructure

We are a fast-growing fintech startup expanding our Blockchain Engineering team .

We’re looking for a hands-on Blockchain Engineer to work on mainnet integrations, wallet security, and smart-contract interactions in a regulated production environment .

This role operates at the intersection of blockchain technology and regulation , including MiCA , Travel Rule , and compliance-driven transaction flows.What you’ll do

Blockchain & Mainnet Operations

Integrate and maintain mainnets (Ethereum / EVM chains and others as required).

Manage RPC providers, node connections, confirmations, reorg handling and monitoring.

- Implement deposit / withdrawal flows with compliance-ready tracking.

Wallets & Security

- Work on hot/cold wallet infrastructure , signing services and key management.
- Apply security best practices for fund custody and transaction execution.
- Coordinate with Security and Compliance teams on risk controls.

Smart Contracts (Practical Scope)

- Interact with simple production smart contracts (payments, transfers, internal logic).
- Deploy, test and monitor contracts with proper gas, fee and failure handling.

Regulatory & Compliance Integration

Support MiCA-aligned crypto operations in the EU.

- Integrate and maintain Travel Rule–compliant transaction flows .
- Ensure traceability and auditability of on-chain transactions.
- Collaborate with Compliance to align blockchain logic with regulatory requirements.

Backend & Systems

Integrate blockchain logic into backend services and APIs.

- Maintain on-chain off-chain synchronization .
- Support reconciliation, monitoring and incident resolution.

What we’re looking for

Hands-on experience with blockchain mainnets (Ethereum / EVM).

Experience with wallets, deposits, withdrawals and transaction monitoring .

Practical smart-contract experience (Solidity or equivalent).

Backend experience with Python, Node.js, Rust or Go .

Strong understanding of crypto security and operational risk.

Familiarity with MiCA, Travel Rule or regulated crypto environments .

Experience working in production systems handling real funds .

- Fluent in English .

What we offer

Barcelona-based role (on-site or hybrid).

Part of a core blockchain team (not a solo position).

- Compensation in USD / USDT .
- Stock options included.
- High-impact role in a regulated fintech + crypto environment.

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