Senior Blockchain Developer

Paxful is the world’s largest people-powered marketplace, connecting over 14 million users across 140+ countries to move, save, and store money - even without a bank account. Founded in 2015 and based in the United States, Paxful offers safe, fast, and reliable access to the global economy through cryptocurrencies bought and sold on a borderless peer-to-peer payment network. With over 500 payment methods for accessing Bitcoin, USDT, and other popular digital and local currencies, Paxful is building a financial system allowing all users to participate in the digital economy.

The Senior Blockchain Developer is responsible for designing, building, and maintaining robust blockchain-based systems that power Paxful’s platform. This role requires deep expertise in blockchain technologies, hands-on experience with API integrations (e.g., BitGo, Fireblocks), and the ability to work with advanced blockchain solutions such as Solana Smart Contracts. You will play a critical role in building secure wallet systems, optimizing transaction processing, and integrating new blockchain features to support Paxful’s expanding ecosystem.

What will you do:

• 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.

Who you are:

• A blockchain expert passionate about building innovative solutions and advancing the crypto ecosystem.
• A detail-oriented and analytical developer focused on performance, reliability, and security.
• A collaborative team player who thrives in a fast-paced environment.
• Excited to work at the intersection of blockchain, fintech, and peer-to-peer technology.

What we are looking for:

• 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.

Recommended Skills:

• 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.

We encourage a remote-first approach for geographically distributed teams, being open to skilled professionals from around the world. Beyond that, we are committed to transparency, openness, and supporting each other to build great things together.

You can expect:

• 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

Notes

We are a fully remotely distributed team. However, we are currently unable to provide visa sponsorship for employment.

Due to legal restrictions, we are unable to hire individuals residing in countries currently under international sanctions.

Upon submitting your application, you consent to receive future communications. The communication will depend on the alignment of your qualifications with this position. Only eligible candidates will receive correspondence.

Interested in Paxful but don't think this role is the best fit for you? View our other positions: https://paxful-crypto.workable.com

Base compensation is dependent on the candidate's residence.

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To recruitment agencies and outsourcing entities: Paxful maintains a strict policy of not accepting third-party applications from recruitment agencies or individual recruiters. Furthermore, any collaboration with outsourcing partners remains outside of our strategic planning.