Middle Senior Backend Engineer

You will develop Go backend services for blockchain and wallet infrastructure. You will build APIs, blockchain scanners, account-abstraction services, marketplace and orderbook capabilities, caching and indexing systems, tests, API documentation, and production monitoring for multi-chain operations.

Responsibilities

• Develop Go backend services for Ethereum interactions and RPC integration
• Integrate with ZK Stack infrastructure and L1 to L2 messaging
• Build wallet backend indexing integrations for token balances and webhooks
• Design APIs for NFT marketplace and orderbook services
• Implement smart-contract interactions using Go bindings
• Build ERC-4337 account-abstraction backend support
• Develop blockchain event scanners with reorganization handling
• Implement Backend-for-Frontend services for multi-chain operations
• Design caching and indexing strategies using Redis and MongoDB
• Write integration tests with a local ZKsync environment
• Document APIs with OpenAPI and Swagger
• Monitor and troubleshoot production systems

Requirements

• Have 2+ years of commercial Go experience
• Understand MongoDB and PostgreSQL query optimization and indexing
• Have experience with Redis caching and session management
• Know message queues such as NATS or RabbitMQ
• Have experience designing REST APIs with OpenAPI or Swagger
• Understand microservices and distributed systems
• Have experience with Docker, Git, and GitLab CI/CD