Senior Backend Developer (Monolith)

Job Description

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 Backend Developer is responsible for designing, implementing, and maintaining the core backend services that drive Paxful’s marketplace, with a strong emphasis on scalability and performance. While PHP expertise is essential, this role also requires experience with Go and Node.js for handling multi-language service integrations and distributed systems. You’ll work closely with cross-functional teams to build robust APIs, optimize platform performance, and support the seamless operation of Paxful’s P2P platform.

What will you do:

• Design and implement scalable, high-performance backend services using Java.
• Develop RESTful APIs and integrate with frontend, mobile, and blockchain systems.
• Optimize existing Java-based microservices for performance, scalability, and reliability.
• Collaborate with product managers and other engineering teams to define and deliver new features.
• Debug, troubleshoot, and resolve production issues, ensuring platform stability.
• Implement security best practices for backend services, particularly in fintech and crypto environments.
• Architect and maintain distributed systems, ensuring efficient data flow and communication.
• Write robust unit and integration tests to maintain code quality.
• Monitor and optimize database queries, ensuring high availability and low latency.
• Work closely with DevOps to deploy and monitor services in cloud environments using Kubernetes and Terraform.
• Participate in peer code reviews, mentoring junior developers to uphold best practices.

Who you are:

• A highly skilled backend developer with a deep passion for Java and distributed systems.
• A problem solver with a focus on delivering efficient, scalable solutions.
• A collaborative team player who values clear communication and teamwork.
• Excited to work on challenging problems in a fast-paced environment, particularly in fintech and crypto.

Requirements

What we are looking for:

• 5+ years of experience in backend development with a strong focus on Java.
• Proficiency in Java frameworks such as Spring Boot or Micronaut.
• Experience designing and building microservices architectures.
• Strong understanding of RESTful API design and event-driven systems.
• Proficiency in working with databases.
• Experience with SQL databases like PostgreSQL and familiarity with NoSQL databases like MongoDB.
• Knowledge of CI/CD pipelines and DevOps workflows.
• Hands-on experience with GitLab CI/CD, Docker, and Kubernetes.
• Familiarity with security best practices in backend development.
• Understanding of authentication and authorization mechanisms (e.g., OAuth, JWT).

Recommended Skills:

• Knowledge of blockchain technologies or cryptocurrency-related systems.
• Experience with message queues (e.g., RabbitMQ, Kafka) for event-driven architectures.
• Familiarity with performance monitoring and distributed tracing tools (e.g., Prometheus, Grafana, Jaeger).
• Contributions to open-source projects or technical communities.

Benefits

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.