Backend Engineer, Java

NymCard is a company focused on enabling fintech and financial innovators to launch seamless payment programs through their modern infrastructure. They are seeking a Backend Engineer (Java) to design and build scalable APIs for real-time payment systems, collaborating with various teams to ensure system security and maintainability while contributing to architectural decisions.

Responsibilities:

• Own and drive the design of scalable backend services and APIs that power real-time payments
• Collaborate closely with Product, DevOps, and Engineering leads to align system capabilities with business goals
• Contribute to architectural decision-making, balancing performance, security, and maintainability
• Lead initiatives to evolve the platform from project-based delivery toward a unified product architecture
• Conduct thoughtful code reviews, raise engineering standards, and mentor others through technical leadership
• Troubleshoot and resolve complex production issues with a focus on root-cause elimination
• Influence and support the adoption of best practices in API design, observability, and operational resilience
• Provide input into roadmap planning from a technical feasibility and scalability perspective

Requirements:

• 6+ years of hands-on Java backend development experience, ideally with distributed systems
• A strong foundation in system design, architecture, and scalability principles
• Proficiency in relational and NoSQL databases (e.g. PostgreSQL, MongoDB, SQL Server, Oracle)
• Deep understanding of RESTful API design, OpenAPI standards, and API gateway patterns
• Experience designing or integrating with messaging systems like Kafka, RabbitMQ, Amazon SQS/SNS in event-driven architectures
• Experience working closely with Product, DevOps, and cross-functional teams to deliver aligned solutions
• Knowledge of secure coding practices, data privacy, and application-level security
• Ability to navigate technical ambiguity and make trade-off decisions under constraints
• Familiarity with CI/CD pipelines, agile delivery, and modern software practices
• Strong communication skills — able to explain technical concepts to non-technical audiences
• Experience evolving monoliths or legacy systems into modular platform architectures
• Exposure to payments infrastructure, such as card issuing, settlement, or transaction clearing
• Familiarity with PCI DSS compliance and security audits
• Hands-on experience scaling platforms in high-growth or regulated environments
• Contributions to engineering culture, such as mentorship, knowledge-sharing, or internal tooling initiatives
• Past experience working in product-first engineering teams or helping shape roadmaps from a technical lens