Golang Engineer

About the job You will design, build, and maintain backend services using Go for Web3 card payment processing. You will develop and maintain smart contract integrations, including interactions with on-chain data and handling transaction flows between the blockchain and application layer. You will create and manage APIs for interactions with the blockchain, payments infrastructure, and third-party services. You will implement efficient and secure transaction handling, with support for asynchronous transaction confirmations and a processing oracle to facilitate sequential transaction workflows. You will develop services to support cross-chain token swaps, stablecoin transactions, and fund management across different chains. You will implement secure data handling practices for sensitive financial data and user information, including encryption, authentication, and authorization protocols. You will ensure high availability and reliability through monitoring, debugging, and troubleshooting issues in live environments, particularly around transaction and fund flows. Responsibilities Design, build, and maintain backend services using Go, focusing on high-performance, low-latency solutions for Web3 card payment processing. Develop and maintain smart contract integrations, including interactions with on-chain data and handling transaction flows between the blockchain and application layer. Create and manage APIs for interactions with the blockchain, payments infrastructure, and third-party services (e.g., Wirex B2B API, Ethereum, and other EVM-compatible chains). Implement efficient and secure transaction handling, with support for asynchronous transaction confirmations and a processing oracle to facilitate sequential transaction workflows. Develop services to support cross-chain token swaps, stablecoin transactions, and fund management across different chains. Implement secure data handling practices for sensitive financial data and user information, including encryption, authentication, and authorization protocols. Ensure high availability and reliability through monitoring, debugging, and troubleshooting issues in live environments, particularly around transaction and fund flows. Requirements 3+ years in Go development, with 1+ year in Web3 or blockchain projects. Understanding of blockchain fundamentals, especially Ethereum and EVM-compatible networks; experience with smart contracts, Ethereum nodes (Geth, Infura, etc.), and wallet integrations. Familiarity with financial transaction lifecycles, particularly in Web3 ecosystems, including token transfers, stablecoin transactions, and cryptocurrency wallet management. Proficient in RESTful API and gRPC service design and development; experience with API security and integration best practices. Proficient in working with relational databases (MySQL) with a strong focus on data consistency and performance. Experience with containerized applications and Kubernetes for deployment in production environments; familiarity with managing Go microservices in Kubernetes. Understanding of cryptographic principles and experience implementing secure data storage and transmission solutions. Familiarity with cloud infrastructure (e.g., AWS, GCP, Azure) and CI/CD pipelines for Go applications. Good English for documentation; Ukrainian or Russian communication skills.