Demo

Senior Java Backend Engineer - CA

Apex Systems
Concord, CA Contractor
POSTED ON 4/25/2026
AVAILABLE BEFORE 5/24/2026
Job#: 3031974

Job Description:

Job Title: Senior Java Backend Engineer (API, Middleware & DevOps)

Location: Concord, CA – Hybrid (3 days onsite)

Contract Length: 18 months (possible extension or conversion)

Pay Rate: $61/hour - $65/hour

Note: We are unable to consider C2C or third-party submissions.

Role Overview

This position supports a mission-critical middleware platform within a highly regulated financial services environment. The role involves consulting on and participating in moderately complex initiatives, contributing to large-scale planning, and resolving engineering challenges. The ideal candidate will leverage a solid understanding of software engineering functions, policies, and compliance requirements while collaborating with client personnel to meet deliverables.

Key Responsibilities

  • Design, develop, and support REST and XML-based APIs, authentication services, and secure middleware integrations for a high-volume platform.
  • Ensure performance, scalability, and resiliency for applications processing millions of daily transactions by conducting performance, stress, and load testing.
  • Lead and contribute to engineering efforts across distributed teams, including onshore and offshore partners.
  • Participate in architecture discussions, SDLC process improvements, and large-scale planning.
  • Work within enterprise-shared DevOps pipelines, supporting CI/CD, build automation, and production deployments.
  • Utilize monitoring tools like Splunk, Elastic, Grafana, and AppDynamics to validate deployments and diagnose production issues.
  • Contribute to cloud-readiness initiatives, including the design and support of containerized services using Kubernetes or OpenShift.
  • Document architecture, technical decisions, and processes in Confluence and manage work using Jira in an Agile Scrum environment.
  • Collaborate with product, QA, and platform partners to deliver on engineering goals.

Required Qualifications

  • 4 years of Software Engineering experience, or equivalent demonstrated through work experience, training, military experience, or education.
  • 4 years of experience with middleware web services and API design and implementation, specifically with Java and Spring.
  • 4 years of experience supporting high-volume, mission-critical applications.
  • 2 years of leadership experience.
  • Demonstrated experience working with distributed teams, including onshore and offshore models.
  • Experience with DevOps or DevSecOps principles, CI/CD pipelines, and SDLC best practices.
  • Knowledge of cloud-ready architecture, including containerization with Kubernetes or OpenShift.
  • Experience with observability and monitoring tools such as Splunk, Elastic, Grafana, or AppDynamics.

Preferred Qualifications

  • Experience with Apigee or other API management tools.
  • Experience implementing Quality Engineering best practices.
  • Familiarity with AI concepts as they relate to engineering and automation.
  • Experience using Confluence and Jira for Agile delivery.
  • Previous experience in the financial services industry.

We are an equal opportunity employer and welcome applications from all qualified candidates regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.

Apex uses a virtual recruiter as part of the application process. Click here for more details.

If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.

Apex Systems is part of the Commercial Segment of ASGN Incorporated.

NYSE: ASGN

4400 Cox Road

Suite 200

Glen Allen, Virginia 23060

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Apex Systems.

Salary : $61 - $65

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