Russian Data Annotation Manager Jobs in Missouri

• Design, develop, and maintain backend services in Go, with a focus on high-performance and low-latency processing for Web3 and card payment systems.
• Build and maintain smart contract integrations, including interactions with on-chain data and transaction flows between blockchain networks and application services.
• Develop and manage APIs connecting blockchain infrastructure, payment systems, and external services.
• Implement secure and efficient transaction-processing workflows, including asynchronous confirmations and sequential transaction orchestration.
• Develop services supporting cross-chain token swaps, stablecoin transactions, cryptocurrency transfers, and fund management across multiple blockchain networks.
• Implement robust security measures for sensitive financial and user data, including encryption, authentication, authorization, and secure data transmission.
• Build and maintain reliable Go microservices deployed in containerized production environments.
• Monitor, troubleshoot, debug, and improve live systems, with particular attention to payment, transaction, and fund flows.
• Work with databases to ensure data consistency, integrity, and performance across financial transaction workflows.
• Contribute to cloud infrastructure, CI/CD pipelines, deployment processes, and production engineering practices.
• Collaborate with other engineers and stakeholders to deliver scalable, secure, and maintainable fintech and blockchain solutions.
• Continuously improve system reliability, performance, observability, and engineering standards.

• 3+ years of professional experience developing applications with Go, including at least 1 year working on Web3 or blockchain-related projects.
• Strong understanding of blockchain fundamentals, particularly Ethereum and EVM-compatible networks.
• Practical experience with smart contracts, Ethereum nodes such as Geth or Infura, blockchain data, and cryptocurrency wallet integrations.
• Understanding of financial transaction lifecycles within Web3 ecosystems, including token transfers, stablecoins, cryptocurrency transactions, and wallet management.
• Strong experience designing and developing RESTful APIs and gRPC services, including knowledge of API security and integration best practices.
• Experience working with relational databases such as MySQL, with a strong focus on consistency, integrity, and performance.
• Hands-on experience with containerized applications and Kubernetes, including deploying and managing Go-based microservices in production.
• Solid understanding of cryptographic principles and experience implementing secure storage and transmission of sensitive data.
• Familiarity with cloud platforms such as AWS, GCP, or Azure.
• Experience with CI/CD pipelines and automated delivery processes for Go applications.
• Strong troubleshooting and analytical skills, particularly when working with complex financial or blockchain transaction flows.
• Good written and spoken English for technical documentation and collaboration; Ukrainian or Russian communication skills are advantageous.
• Ability to work independently in a remote environment while collaborating effectively with distributed engineering teams.

Nice-to-have skills:

• Understanding of zk-rollups, sidechains, and Layer 2 scaling technologies.
• Experience with monitoring, observability, and service-health tooling for high-volume or financial transaction systems.
• Experience with Infrastructure-as-Code tools such as Terraform.
• Knowledge of automated deployment strategies for blockchain and Web3 services.

• Fully remote working opportunity with flexible working hours.
• Option to work from home or an office environment where applicable.
• Competitive B2B contract arrangement.
• Home office allowance.
• Premium rates for the company's products.
• Virtual share options scheme available after the probation period.
• Health insurance coverage after the probationary period.
• 20 business days of paid annual leave.
• Paid sick leave.
• Birthday and work anniversary leave.
• Additional length-of-service holidays.
• Access to online events focused on learning, professional development, and team engagement.
• PE accounting support and assistance.
• Opportunity to work on innovative fintech, blockchain, and Web3 payment technologies in an international environment.