Senior Java Backend Engineer

About NymCard

NymCard's mission is to enable fintech and financial innovators to launch frictionless payment programmes with our modern infrastructure, at record speed. Our open API modern card issuing platform provides flexibility and control to issue cards, authorise transactions, and manage payment operations with just one integration and one partner.

We are a team of industry experts and technology innovators who take a dynamic approach to solving complex industry challenges. NymCard has an open and collaborative work environment and together we make up the NymCardian Nation. We power possibilities for our customers and each other by bringing the best talent together to do the best quality work we can.

The Role

As a Senior Backend Developer, you'll take ownership of designing and building APIs that support NymCard's real-time payment infrastructure. You'll work on distributed systems that process millions of transactions, focusing on scalability, performance, and reliability.

You'll work closely with other engineers, DevOps, and Product teams to ensure that systems are secure, maintainable, and designed for long-term evolution. This role goes beyond writing code. We're looking for engineers who contribute to architecture, technical design, and platform thinking.

As we evolve from a software delivery model to a centralized platform product, you'll play a key role in shaping how that transition is built. Your input will influence how we move from project-based feature development toward a cohesive, scalable, and modular backend system.

What You'll Be Doing

• 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

What You Bring

• 5+ 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

Bonus Points

• 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