Senior Blockhai̇n / Crypto Backend Developer

Location: On-Site
Employment Type: Full-Time

About Us

We are a team dedicated to building innovative digital products with a strong focus on user experience. Our goal is to create high-performance systems that deliver seamless and engaging experiences to our users.

As our team continues to grow, we are looking for a Senior Blockchain / Crypto Backend Developer who will design and build secure, scalable blockchain infrastructure and crypto payment solutions for our products.

What Makes This Role Interesting

• Build production-grade blockchain infrastructure and crypto payment systems
• Work on cutting-edge cryptocurrency and DeFi technologies
• Collaborate with senior developers and product teams to deliver secure, scalable crypto solutions
• Opportunity to shape blockchain architecture, security practices and off-chain data processing

Responsibilities

• Design, implement and maintain blockchain-based backend systems
• Develop and manage smart contracts, ensuring security and efficiency
• Build crypto payment gateways and integrate with multiple blockchain networks
• Implement secure wallet management, key storage and transaction flows
• Ensure high-performance, fault-tolerant architecture for blockchain services
• Develop off-chain indexing and event processing systems (e.g., TheGraph or custom solutions)
• Collaborate with product and frontend teams to deliver crypto-based features
• Participate in code reviews, smart contract audits and testing processes
• Monitor and optimize transaction throughput, latency and gas fees
• Stay up-to-date with the latest blockchain technologies, standards and security practices

Requirements

• 5+ years of backend development experience, with at least 2+ years in blockchain or crypto systems
• Strong experience with smart contract development (Solidity, Rust, or similar)
• Hands-on knowledge of Ethereum, BSC, Solana or other blockchain networks
• Experience building crypto payment solutions, wallets and secure transaction flows
• Proficiency in Node.js, Go or Python for backend services
• Experience with PostgreSQL, Redis or other databases in blockchain contexts
• Familiarity with AWS, Docker, Kubernetes or similar cloud and container technologies
• Strong understanding of cryptography, digital signatures and secure key management
• Experience with monitoring and logging tools, including Graylog or blockchain-specific solutions
• Strong problem-solving, research and analytical skills
• A responsible, collaborative team player with excellent communication skills

Nice to Have

• Experience with 3rd party integrations, including payment providers
• Familiarity with Graylog or similar logging systems
• Knowledge of Docker and Kubernetes
• Familiarity with Jira
• Experience with microservice-based architectures
• Knowledge of Go Lang