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Kunai

Senior Software Engineer, Java

Kunai

Senior Software Engineer at Kunai developing payment processing solutions. Contributing to digital payments integration and application modernization efforts in a fintech environment.

Posted 7/2/2026full-timeRemote • 🇺🇸 United StatesSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in Java software engineering, performance testing strategies, and relational databases, particularly Oracle and PostgreSQL. Proven ability to optimize performance in digital payments and financial services technology while ensuring compliance with PCI requirements.

Highest-signal resume keywords
Java Software EngineeringPerformance Testing StrategyRelational Database ManagementContainerized Environments (OpenShift)Digital Payments Technology

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
JavaOraclePostgreSQLPerformance TestingLoad TestingBottleneck ResolutionTest Framework DesignEvent-Driven ArchitectureAI-Assisted Development ToolingCloud-Native Environments
Soft Skills
Strong Communication SkillsCollaborationAdaptability
Tools & Technologies
OpenShiftKubernetesTomcatWebSphereGitHub Copilot
Industry Keywords
Digital PaymentsCard ProcessingFinancial Services TechnologyPCI ComplianceData Lifecycle Management

Tech Stack

Tools & technologies
CloudDistributed SystemsJavaKubernetesOpenShiftOraclePostgres

About the role

Key responsibilities & impact
  • You will be embedded across one or more workstreams supporting digital payments engineering, with responsibilities that may include:
  • Design and execute enterprise-grade performance testing strategies for payment processing services, defining frameworks, tooling, and success criteria from the ground up.
  • Identify performance bottlenecks across legacy and modern service layers and drive measurable improvements through analysis and targeted optimization.
  • Instrument and validate services running on Java, Oracle, Tomcat, and WebSphere as well as modern workloads running on PostgreSQL and OpenShift.
  • Collaborate with backend engineers to ensure scalability requirements are met across all environments prior to release.
  • Translate performance findings into clear recommendations for engineering leads and stakeholders.
  • Build and maintain full-stack backend services supporting card network integration, working primarily in Java with PostgreSQL and OpenShift Container Platform (OCP).
  • Contribute to application modernization efforts, migrating and re-platforming services from legacy infrastructure to cloud-native environments.
  • Leverage AI-assisted development tooling (including GitHub Copilot) to improve development velocity and code quality.
  • Participate in code reviews, architectural discussions, and cross-team technical planning sessions.
  • Work with event-driven services running on OpenShift and Oracle and PostgreSQL backends to support data lifecycle and compliance requirements.
  • Serve as a flexible, senior contributor across teams where engineering depth and experience are needed most.

Requirements

What you’ll need
  • 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 (OpenShift, Kubernetes, or equivalent).
  • Familiarity with legacy enterprise application servers — Tomcat and/or WebSphere experience a plus.
  • At least one enterprise-level performance testing engagement — defining strategy, selecting tooling, executing tests, and presenting findings.
  • Experience with performance profiling, load testing, and bottleneck resolution in high-throughput, distributed systems.
  • Ability to design logical, streamlined test frameworks from scratch and operate with minimal guidance.
  • Background in digital payments, card processing, or financial services technology strongly preferred.
  • Understanding of PCI compliance requirements and secure data handling practices.
  • Familiarity with event-driven architecture patterns and OpenShift-based eventing.
  • Demonstrated ability to work effectively in large, matrixed program environments with multiple teams and stakeholders.
  • Strong written and verbal communication skills; able to translate technical complexity for non-technical audiences.
  • Comfortable operating in environments with evolving requirements and ambiguity.

Benefits

Comp & perks
  • Competitive compensation
  • Professional development opportunities
  • Flexible work arrangements