Senior Java Backend Engineer — Hybrid (Onsite 3x/Remote 2x)

Zillion Technologies; Town of Vienna (WI); Hybrid; USD 103,000 - 117,000; Full time

Job summary

Zillion Technologies in the United States seeks a mid-to-senior Backend Java Developer to design, build, test, and maintain secure backend services for banking platforms. You will collaborate with analysts, QA, frontend engineers, and cross-functional teams to deliver scalable, reliable, and high-quality solutions.

This role requires strong engineering judgment, independent work, and the ability to provide guidance to junior engineers.

Qualifications

• Strong Java experience with Java 17+ preferred.
• Solid knowledge of enterprise Java, Spring, Spring Boot, web services, and RESTful APIs.
• Experience with automated testing frameworks such as JUnit and Mockito.
• Proficiency with Git and CI/CD tools (Maven, Docker, Jenkins, GitHub, Azure DevOps).
• Strong understanding of databases, SQL, and data integration patterns.
• Experience troubleshooting distributed systems and designing scalable microservices.
• Experience developing cloud-native applications, with Microsoft Azure preferred.
• Strong communication and collaboration skills, able to explain technical concepts to non-technical audiences.

Responsibilities

• Design, build, integrate, and maintain secure backend services and APIs for mobile, web, enterprise, and partner systems.
• Design for performance, reliability, resiliency, observability, quality, and responsiveness.
• Collaborate with cross-functional teams to define, design, and deliver sustainable technical solutions.
• Develop and maintain unit, integration, and automated tests to support reliable delivery.
• Apply secure coding, data protection, and engineering standards.
• Troubleshoot production defects, performance bottlenecks, integration issues, and complex service dependencies.
• Refactor code and conduct peer reviews to improve security, quality, readability, and maintainability.
• Contribute to solution design, technical documentation, and proof-of-concepts supporting architectural decisions.
• Support services across testing, deployment, production troubleshooting, and continuous operational improvement.
• Participate in Agile ceremonies and advocate for adaptive planning, automation, reusable solutions, and continuous improvement.
• Share knowledge and support the development of less experienced engineers.

Skills

Java

Spring/Spring Boot

RESTful APIs

JUnit/Mockito

Git

CI/CD

Maven

Docker

Jenkins

Azure DevOps

SQL/databases

Distributed systems

Cloud-native

Tools

Git

CI/CD tools

Maven

Docker

Jenkins

GitHub

Azure DevOps

Job description

Zillion Technologies in the United States seeks a mid-to-senior Backend Java Developer to design, build, test, and maintain secure backend services for banking platforms. You will collaborate with analysts, QA, frontend engineers, and cross-functional teams to deliver scalable, reliable, and high-quality solutions.

This role requires strong engineering judgment, independent work, and the ability to provide guidance to junior engineers.