Senior Blockchain Developer

Summary

Join Paxful as a Senior Blockchain Developer and design, build, and maintain robust blockchain-based systems powering our global P2P marketplace. You will leverage your expertise in blockchain technologies, API integrations (e.g., BitGo, Fireblocks), and Solana Smart Contracts to build secure wallet systems, optimize transaction processing, and integrate new features. This role demands deep experience in blockchain development, proficiency in programming languages like Python, Go, or Rust, and a strong understanding of blockchain security. You will collaborate with cross-functional teams, conduct security audits, and stay updated on advancements in blockchain technology. Paxful offers a competitive salary, a fully remote work environment with flexible hours, and opportunities for professional growth and development.

Requirements

• 5+ years of experience in blockchain development or related fields
• Extensive experience with Bitcoin, UTXOs, multi-signature wallets, and Layer 2 solutions like Lightning Network
• Proficiency in blockchain programming
• Strong knowledge of Python, Go, or Rust for smart contract development
• Experience with API integrations for custodial and non-custodial wallets
• Hands-on experience with BitGo, Fireblocks, or similar vendors
• Proficiency with smart contract development and deployment
• Hands-on experience working with Solana Smart Contracts using Anchor or similar frameworks
• Deep understanding of blockchain security best practices
• Familiarity with cryptographic techniques, secure wallet implementation, and transaction validation

Responsibilities

• Develop and maintain blockchain-based services and wallet systems to support Paxful’s P2P marketplace
• Design and implement integrations with third-party providers like BitGo, Fireblocks, and other custodial/non-custodial solutions
• Build and deploy smart contracts on platforms like Solana, focusing on scalability and security
• Optimize UTXO management, transaction processing, and on-chain activity for performance and cost efficiency
• Develop tools for transaction monitoring, fraud detection, and blockchain analytics
• Collaborate with cross-functional teams to define and deliver blockchain-focused features and improvements
• Create and manage wallet solutions, including multi-signature wallets, self-custody solutions, and Lightning Network integrations
• Integrate blockchain technologies with Paxful’s backend services and APIs to enable seamless transactions
• Conduct security audits and implement robust measures to protect funds and user data
• Debug and resolve blockchain-related issues, ensuring uninterrupted platform availability
• Stay updated on advancements in blockchain technology and propose relevant improvements to the platform

Preferred Qualifications

• Familiarity with other blockchain platforms, such as Ethereum and its smart contract ecosystem
• Experience with DeFi protocols, self-custody wallets, and cross-chain interoperability
• Knowledge of blockchain analytics tools (e.g., Chainalysis, Blockchair)
• Experience with event-driven architectures and message queues like Kafka or RabbitMQ
• Contributions to open-source blockchain projects or technical communities

Benefits

• Competitive salary
• Fully remote work environment
• Flexible working hours with a 4-hour overlap in Eastern Time (EST)
• Opportunity to work with cutting-edge technologies on impactful projects
• Collaborative, innovative, and supportive work culture
• Opportunity to mentor and lead a team of talented engineers
• Professional growth and development opportunities