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Senior Software Engineer

Lisbon, Portugal (DeHouse)💼 Full-time🗓 2026-09-11 → 2026-09-26

Core

Design, develop, and maintain secure, scalable distributed systems and blockchain platforms supporting digital payments and digital asset services.

Role type

Senior IC software engineer (blockchain/distributed systems)

Builds

Blockchain platforms, distributed applications, secure backend services, and cloud-native microservices

Domain

Fintech, digital payments, blockchain, distributed systems

Deliverable

production ML models | product features

Required skills

Java, Spring, Angular, REST APIs, GraphQL, microservices architecture, cloud platforms (AWS/Azure), CI/CD, Docker, Kubernetes, cryptographic protocols, key management

Preferred skills

Ethereum, Hyperledger, Bitcoin, Polygon, Solana, Web3 technologies, smart contract interactions, event-driven architectures, OAuth2, OIDC, MFA

Technologies

Java, Spring, Angular, AWS, Azure, Docker, Kubernetes, Ethereum, Hyperledger, Bitcoin, Polygon, Solana

Responsibilities

Design and develop blockchain platforms and distributed applications; Build secure and scalable backend services; Develop integrations with blockchain networks and cryptographic services; Create and maintain APIs and microservices; Conduct code reviews and mentor junior engineers; Troubleshoot complex technical issues in distributed environments

Seniority

Senior, hands-on IC with mentorship responsibilities

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