Senior Backend Developer - Java

Our Company NymCard is a full-stack payments infrastructure company. Founded in 2018, we give banks and financial institutions one platform, nCore, to issue cards, move money, lend, settle, and manage financial crime as a single system, not separate vendors stitched together. nCore is AI-native and built on a real-time data core, so every product runs on one shared view of the customer. We're a team of 180+ with a high bar. AI isn't a department here, it's how every team works, and we back decisions with data, not opinion. The way we work has a name, BOLD: we build trust through transparency, we own outcomes rather than tasks, we lead with speed because in payments a delay is a real cost, and we deliver excellence as a habit. If you want real ownership and room to move fast, this is the team for you. The Role As a Senior Backend Engineer at NymCard, you will play a key role in designing and implementing high-volume, low-latency APIs, and working across teams to deliver scalable, secure solutions that power frictionless payments. You will engage with Engineering, DevOps and Product teams from design through production support, while building new features at scale and collaborating in a trustful, agile environment. Responsibilities: Design and implement high-volume, low-latency APIs. Engage with Engineering, DevOps, Marketing teams throughout design, implementation, testing, deployment and production support. Work with engineers across the company to build new features at large scale. Enjoy team collaboration within a trustful culture. Skills & Qualifications: Minimum of 5+ years of software development experience working with distributed projects and technologies (Java). Hands-on experience with team management/leadership. Experience with any NoSQL/RDBMS (Mongo, SQL Server, Oracle, PostgreSQL etc.). Awareness of application security principles including secure coding standards and practices. Familiarity with various API design and architectural patterns (API Gateway, OpenAPI, REST). Understanding fundamental design principles behind a scalable application. Additional Skills: Experience with stream-processing systems such as Apache Kafka, Amazon SQS, Google Cloud Pub/Sub. Upper-intermediate (B2) or higher English level. Agile enthusiast (Scrum) knowledge, estimation practices. Would be a plus: Experience in payments, ISO8583 message format. Experience with HSM (Thales preferred). Knowledge of PCI Compliance standards. Knowledge of CI/CD. Knowledge in Kubernetes. Knowledge of Cloud (Google, AWS, Azure) and Docker. This role is remote based in Ukraine.