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# Senior Java Backend Developer

- **Company:** Staffworxs LLC
- **Location:** Mechanicsburg, PA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Spring Security, Amazon Web Services, Data Analysis, User Authentication, Microsoft Azure, Cloud Computing, Code Review, Databases, Continuous Integration, Data Validation, Data Security, DevOps, Hibernate (Java), Web Servers, Java Persistence API, Junit, Key Management, PostgreSQL, Apache Maven, Enterprise Messaging Systems, OAuth, OpenID, Performance Tuning, Public Key Infrastructure, Mockito, Secure Coding, Software Engineering, Azure Service Bus, Spring Cloud, Concurrency, Spring-boot, Backend, Integration Tests, Apache Kafka, Front End Software Development, Restful APIs, Docker, Microservices
- **Published:** October 30, 2026
- **Apply:** https://www.careerbuilder.com/job-details/senior-java-backend-developer-mechanicsburg-pa--36cc31a7-169e-46c8-8784-5f829b78a4d7

## About the Role

Java, Software Engineering, Data Analysis, Java, Software Engineering, Microservices, Concurrency, Java Persistence API (JPA), Cloud Computing, PostgreSQL, * 8+ years of backend development experience, including 5+ years building Spring/Spring Boot microservices.

 * Expert knowledge of modern Java (17+), concurrency, and virtual threads.
 * Spring Boot, Spring Security, Spring Data JPA, and Spring Cloud.
 * PostgreSQL or equivalent databases, with JPA/Hibernate performance tuning.
 * Messaging technologies such as Kafka or Azure Service Bus.
 * OAuth2/OIDC authentication and authorization.
 * Working knowledge of PKI, HSM/KMS, and COSE/CBOR.
 * Maven, Docker, CI/CD pipelines, and OpenTelemetry-based observability.
 * Strong mentoring, technical writing, and stakeholder communication skills.

Preferred Skills

 * Familiarity with digital identity ecosystems.
 * Experience integrating identity-proofing vendors and systems of record.
 * Experience in government or other regulated environments.
 * Azure or AWS cloud certification.

## Description

* Design, develop, and document REST APIs and backend microservices.
 * Implement secure authentication and authorization using Spring Security, OAuth2, OIDC, and role-based, least-privilege access.
 * Apply secure coding practices, including input validation, safe HTTP client configurations, and secure secrets management.
 * Implement cryptographic signing and encryption using Bouncy Castle and cloud KMS/HSM SDKs, keeping private keys within the HSM and following approved algorithms.
 * Build reliable services using Resilience4j and optimize data access with Spring Data JPA/Hibernate.
 * Develop unit and integration tests using JUnit 5, Mockito, and Testcontainers.
 * Lead design reviews and document architectural decisions.
 * Mentor junior developers and conduct constructive code reviews.
 * Collaborate with architecture, security, DevOps, QA, and front-end teams while communicating risks and progress to stakeholders.
 * Support production services through incident response, root-cause analysis, and continuous improvement.

Staffworxs is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive workplace for all employees, regardless of race, color, religion, gender, sexual orientation, national origin, age, disability, or veteran status.