Senior Backend Developer

Summary

Join Paxful as a Senior Backend Developer and design, implement, and maintain core backend services for our global P2P cryptocurrency marketplace. You will leverage your Java expertise, along with Go and Node.js, to build scalable and high-performance systems. Collaborate with cross-functional teams to develop RESTful APIs, optimize platform performance, and ensure platform stability. This role requires 5+ years of backend development experience with a strong focus on Java and microservices architectures. We offer a fully remote work environment with flexible hours and opportunities for professional growth and development.

Requirements

• 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)

Responsibilities

• 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

Preferred Qualifications

• 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

• 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