Senior Full-Stack Developer (Backend-Focused, Web3)

You will own backend systems that interact directly with blockchains, manage transaction lifecycles, and integrate on-chain and off-chain components into a robust production environment.

Responsibilities

• Design, develop, and maintain backend services using TypeScript and NestJS
  
• Build and operate a microservices architecture with scalable, fault-tolerant services
  
• Design and implement event-driven systems using message queues (Kafka, RabbitMQ, etc.)
  
• Design, optimize, and maintain relational and non-relational databases
  
• Implement seamless Web3 transaction flows including transaction creation, signing coordination, submission, confirmation, retries, and failure handling
  
• Manage the complete Web3 transaction lifecycle and blockchain event processing
  
• Integrate blockchain interactions with backend services and off-chain systems
  
• Work with RPC providers, blockchain node infrastructure, and Web3 APIs
  
• Build secure and performant REST APIs supporting Web3 use cases
  
• Apply NestJS patterns and general software design patterns
  
• Ensure system reliability through logging, monitoring, and performance optimization
• Collaborate closely with frontend, blockchain, and product teams

Requirements

• 6–8 years of professional backend development experience
  
• Strong expertise in TypeScript and NestJS
  
• Hands-on experience with event-driven architectures and message queues (Kafka, RabbitMQ, etc.)
  
• Experience designing and operating microservices and inter-service communication
  
• Experience with relational databases (PostgreSQL, MySQL) and non-relational databases (MongoDB, Redis, etc.)
  
• Strong understanding of the Web3 transaction lifecycle, including gas management, confirmations, retries, and re-org handling
  
• Experience designing reliable, production-grade transaction workflows
  
• Solid understanding of backend design patterns and scalable system design
  
• Experience building secure, high-availability backend systems
  
• Experience with Docker, CI/CD pipelines, and cloud platforms (AWS)
  
• Knowledge of wallet integrations, signature verification, nonce management
  
• Experience working with multiple chains, including EVM chains (Ethereum, Polygon) and non-EVM chains (e.g. Solana)
  
• Strong problem-solving skills and clear communication in remote environments
  
• English is required (fluent, written and spoken)

Nice to have

• Familiarity with blockchain re-orgs, finality concepts, and confirmation strategies
  
• Experience with off-chain/on-chain data synchronization
  
• Prior experience in fintech, payments, or financial infrastructure

Who you are

• Hands-on by nature — you genuinely enjoy writing code
  
• You focus on solving real problems, not just talking about them
  
• You help non-technical teammates move projects forward and unblock progress
  
• You treat your team with care — people are the most important asset
  
• You value clean, well-structured codebases, repositories, and backlogs
  
• You keep CI/CD, workflows, and documentation organized and reliable

How we work

• Global team with headquarters in Cyprus
  
• Russian is a plus, but not required
  
• We value respect, empathy, and clarity above everything else
  
• Flat structure — with no unnecessary layers
  
• We move fast, make decisions quickly, and focus on execution
  
• Remote-first setup, working from anywhere
  
• Timezone overlap within Western–Eastern Europe preferred
  
• Flexible working hours built on trust, not micromanagement
  
• Competitive compensation based on experience
  
• Long-term role with real ownership and growth potential

Conditions

• Location: Remote
• Employment Type: Full-time
• Experience: 6–8 years
• Timezone: CET / MENA / Asia
• Seniority: Hands-on Senior
• Compensation: Competitive, depending on experience