Blockchain engineer
hace 1 semana
Blockchain Engineer – Mainnet, Wallets & Regulatory IntegrationsOn-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 Mi CA, Travel Rule, and compliance-driven transaction flows. What you'll doBlockchain & 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 & SecurityWork 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 Mi CA-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 Mi CA, 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.
-
Blockchain Engineer
hace 1 semana
Madrid, España Bnka A tiempo completoBlockchain Engineer – Mainnet, Wallets & Regulatory IntegrationsOn-site / Hybrid – Barcelona | Fintech & Crypto Infrastructure We are a fast-growingfintech startupexpanding ourBlockchain Engineering team . We’re looking for ahands-on Blockchain Engineerto work onmainnet integrations, wallet security, and smart-contract interactionsin aregulated...
-
Blockchain Engineer
hace 5 horas
Madrid, España Bnka A tiempo completoBlockchain Engineer – Mainnet, Wallets & Regulatory IntegrationsSi desea conocer los requisitos para este puesto, siga leyendo para obtener toda la información relevante.On-site / Hybrid – Barcelona | Fintech & Crypto Infrastructure We are a fast-growingfintech startupexpanding ourBlockchain Engineering team . We’re looking for ahands-on Blockchain...
-
Blockchain Engineer
hace 4 días
Madrid, España Yeah! Global A tiempo completoAbout the job Blockchain Engineer - Spain (Remote) One of our clients based in CA, USA is looking to hire 8 talented Blockchain Engineers globally to join their growing team. The ideal candidate will have a strong background in blockchain development, with a focus on developing and implementing innovative solutions for our clients. As a Blockchain Developer,...
-
Blockchain Engineer
hace 4 días
Madrid, España Yeah! Global A tiempo completoAbout the job Blockchain Engineer - Spain (Remote) One of our clients based in CA, USA is looking to hire 8 talented Blockchain Engineers globally to join their growing team. The ideal candidate will have a strong background in blockchain development, with a focus on developing and implementing innovative solutions for our clients. As a Blockchain Developer,...
-
Blockchain Engineer
hace 5 horas
Madrid, España Yeah! Global A tiempo completoAbout the job Blockchain Engineer - Spain (Remote)One of our clients based in CA, USA is looking to hire 8 talented Blockchain Engineers globally to join their growing team. The ideal candidate will have a strong background in blockchain development, with a focus on developing and implementing innovative solutions for our clients. As a Blockchain Developer,...
-
Senior Software Engineer
hace 24 horas
Madrid, España 1inch Labs A tiempo completoOverviewTodas las habilidades, cualificaciones y experiencia relevantes que necesitará un candidato seleccionado se enumeran en la siguiente descripción.1inch is the DeFi ecosystem building financial freedom for everyone. 1inch products help users and builders trade, hold and track digital assets with security and an intuitive user experience. We are...
-
Senior Software Engineer
hace 5 horas
Madrid, España 1inch Labs A tiempo completoOverview1inch is the DeFi ecosystem building financial freedom for everyone. 1inch products help users and builders trade, hold and track digital assets with security and an intuitive user experience. We are looking for a Senior Blockchain Engineer with a Get Stuff Done mentality and a passion for innovation. You will design, develop, and optimise smart...
-
Blockchain Engineer
hace 2 días
Madrid, España Yeah! Global A tiempo completoAbout the job Blockchain Engineer - Spain (Remote)One of our clients based in CA, USA is looking to hire 8 talented Blockchain Engineers globally to join their growing team. The ideal candidate will have a strong background in blockchain development, with a focus on developing and implementing innovative solutions for our clients. As a Blockchain Developer,...
-
Blockchain DevOps Engineer
hace 5 días
Madrid, España Crypto.com A tiempo completoResponsibilities Maintain and support blockchain infrastructure Review and propose configuration of blockchain software and network setup of nodes running the blockchain software Develop deep understanding of the Blockchain technology (specifically public Blockchain) Develop and share with others on security threats of various blockchain technology Define...
-
Blockchain DevOps Engineer
hace 5 horas
Madrid, España Crypto.com A tiempo completoResponsibilities Maintain and support blockchain infrastructure Review and propose configuration of blockchain software and network setup of nodes running the blockchain software Develop deep understanding of the Blockchain technology (specifically public Blockchain) Develop and share with others on security threats of various blockchain technology Define...
