[Hiring] Java Engineer @Kunai

Role Description

We are seeking a Senior Software Engineer to join a high-impact digital payments modernization program supporting the integration of a major card network into one of the largest financial institutions in the United States. This is a hands-on engineering role at the intersection of legacy and modern infrastructure, where you will contribute to both the reliability of mission-critical payment systems today and help shape the architecture that will power them tomorrow.

Some things you may work on:

• Domain & Service Architecture
  • Apply domain-driven design to define bounded contexts, domain models, and aggregate boundaries for card-network reference data.
  • Develop and harden a Spring Boot / JPA / PostgreSQL Aurora service with Liquibase-managed schema migrations.
  • Design and own integration workflows and routing using Apache Camel (or equivalent).
  • Develop an event-driven backbone using Kafka.
• Frontend & Identity
  • Develop a micro-frontend application (Next.js/React/TypeScript).
  • Own the OAuth2/OIDC identity architecture end-to-end.
• Cloud & Platform
  • Design and govern AWS IAM policy, S3, and CloudFront architecture across multiple environments.
  • Lead deployment on the organization's internal static cloud hosting platform.
  • Drive test-driven development practice across the team.
• Scalability, Performance Testing & Validation
  • Design and execute enterprise-grade performance testing strategies for payment processing services.
  • Identify performance bottlenecks across legacy and modern service layers.
  • Instrument and validate services running on Java, Oracle, Tomcat, and WebSphere.
  • Collaborate with backend engineers to ensure scalability requirements are met.
• Application Engineering
  • Build and maintain full-stack backend services supporting card network integration.
  • Contribute to application modernization efforts.
  • Leverage AI-assisted development tooling to improve development velocity and code quality.
  • Participate in code reviews, architectural discussions, and cross-team technical planning sessions.
• General Engineering
  • PCI data purging pipelines and event-driven architecture patterns.
  • Work with event-driven services running on OpenShift and Oracle and PostgreSQL backends.
  • Serve as a flexible, senior contributor across teams.

Qualifications

• 5+ years of professional software engineering experience, primarily in Java.
• Strong working knowledge of relational databases — Oracle and/or PostgreSQL required.
• Experience deploying and operating services in containerized environments.
• Familiarity with legacy enterprise application servers — Tomcat and/or WebSphere experience a plus.
• Experience with Spring Boot/JPA, business rules engines, and integration/orchestration frameworks.
• Working knowledge of Kafka or similar event-streaming platforms.

Requirements

• Practical experience applying domain-driven design in a production system.
• Demonstrated ownership of authorization/data-access control design.
• Experience designing and governing cloud IAM, storage, and CDN architecture.
• Experience with modern frontend frameworks.
• Experience owning OAuth2/OIDC identity flows end-to-end.
• At least one enterprise-level performance testing engagement.
• Demonstrated experience driving test-driven development practices across a team.
• Background in digital payments, card processing, or financial services technology strongly preferred.
• Demonstrated ability to work effectively in large, matrixed program environments.

Benefits

• Competitive compensation.
• Professional development opportunities.
• Flexible work arrangements.

Company Description

Our success over the past 20 years is rooted in our exceptional team, which thrives in a culture of collaboration, creativity, and continuous learning. We remain committed to cultivating an environment where people feel valued, have a voice, and are given the tools to grow—both personally and professionally—while pushing the boundaries of innovation in the fintech industry.