Senior Software Engineer Team Lead (Blockchain Integration team)

Wrocław, Lower Silesian Voivodeship, Poland. Porto, Porto District, Portugal. Sofia, Sofia City Province, Bulgaria. Madrid, Community of Madrid, SpainFull-TimeSenior

Salary not disclosed

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Job Details

Experience: 5+ years of backend and distributed systems development experience
Required Skills: AWSBackend DevelopmentDockerPostgreSQLKubernetesSoftware ArchitectureAzureRedisTerraformMicroservicesLangChainDistributed Systems

Requirements

5+ years of backend and distributed systems development experience
Strong practical experience with blockchain-integrated systems and enterprise architecture design
Proven ability to define and deliver end-to-end blockchain architecture and integration strategy
Experience building stand-alone blockchain developer tools and SDKs
Experience shaping Layer 2 direction (rollups, sidechains, payment channels, where applicable)
Experience designing token-based access control and billing architecture
Experience with wallet and transaction lifecycle design for production systems
Experience with cross-chain integration and interoperability strategy
Strong focus on scalability, security, and cost efficiency of blockchain components
Experience building and operating microservices with multiple integrations
Strong experience with Kubernetes and containerized deployments (Docker)
Experience with Infrastructure as Code (Terraform or equivalent)
Experience with event-driven architecture and distributed system reliability patterns
Strong experience with PostgreSQL and practical knowledge of Redis
Solid understanding of software architecture and system design
Experience as a Technical/Team Lead with end-to-end ownership of delivery and technical decisions
Hands-on expertise with AI software development tools (for example Cursor and Claude Code)

Responsibilities

Lead design and development of backend services and integrations across platform components
Drive integration efforts between platform components and blockchain layers
Collaborate closely with cross-functional teams to define and deliver solutions
Guide the team on implementation, quality, and engineering best practices
Ensure alignment across services in a highly integrated environment
Contribute to system design, technical documentation, and diagrams
Ensure code quality and reliability through testing and continuous improvements
Troubleshoot and resolve issues across distributed systems and integrations

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