Rest Api Developer Jobs in Illinois (NOW HIRING)

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Location
Atlanta, Chicago, Dallas, NJ, Nashville
About the job you're considering
At Capgemini, you will collaborate with cross-functional teams to deliver innovative technology solutions that drive business value and enhance client experiences. You will contribute to the design, development, and continuous improvement of scalable, high-quality solutions in a dynamic and collaborative environment.
Your role
The z/OS Connect API Engineer is responsible for modernizing enterprise mainframe services by enabling secure, scalable, and reusable APIs using IBM z/OS Connect. This role serves as a critical bridge between traditional CICS/COBOL-based systems and modern API-driven, cloud-native architectures, helping organizations accelerate digital transformation while maximizing the value of existing mainframe investments.
The ideal candidate will have strong expertise in IBM z/OS Connect, API development, mainframe integration technologies, and enterprise security frameworks, along with experience in automation and CI/CD practices.
Key Responsibilities
API Development & Integration

• Design, develop, and deploy RESTful APIs using IBM z/OS Connect Enterprise Edition.
• Expose existing CICS, COBOL, and DB2 transactions as modern API services.
• Create and maintain API service definitions, request/response mappings, and YAML-based configurations.
• Develop and manage OpenAPI specifications in alignment with enterprise API standards and governance frameworks.
• Build reusable integration patterns and API accelerators to support rapid service onboarding.

Security & Authentication

• Configure and support enterprise authentication and authorization mechanisms, including:
• JWT (JSON Web Tokens)
• OAuth 2.0
• OpenID Connect (OIDC)
• RACF
• Certificate-based authentication
• Ensure APIs comply with organizational security, compliance, and governance requirements.

DevOps & Deployment

• Design and maintain CI/CD pipelines using GitHub Actions, Gradle, and related DevOps tools.
• Automate API deployment, testing, and release management processes.
• Support integration with enterprise API management platforms and gateways.

Platform Support & Optimization

• Troubleshoot and resolve API performance, security, configuration, and connectivity issues.
• Monitor API health, reliability, and service availability.
• Collaborate with infrastructure, middleware, and application teams to optimize service performance.

Modernization & Transformation

• Support enterprise mainframe modernization initiatives.
• Contribute to Shadow Service Migration and API enablement programs.
• Promote API-first and cloud-integration best practices across development teams.

Required Skills & Experience
Core Technologies

• IBM z/OS Connect Enterprise Edition
• REST API Development
• OpenAPI / Swagger Specifications
• JSON and XML
• CICS
• COBOL
• DB2
• RACF

Development & DevOps

• GitHub
• CI/CD Pipelines
• Git-based Version Control
• Gradle Build Automation

Additional Competencies

• API Design and Development Best Practices
• Mainframe Integration and Connectivity
• Troubleshooting and Performance Tuning
• Enterprise Security and Authentication Frameworks

Preferred Skills

• API Management (APIM)
• Java Development
• Spring Boot
• OAuth 2.0 and OpenID Connect (OIDC)
• Enterprise Integration Patterns
• Mainframe Modernization Programs
• Cloud-native Architecture and Microservices

Technical Competencies

• Strong understanding of mainframe application architecture and transaction processing.
• Experience exposing legacy services as modern REST APIs.
• Ability to translate business and technical requirements into scalable API solutions.
• Knowledge of enterprise security, authentication, and authorization standards.
• Familiarity with API lifecycle management and governance frameworks.
• Understanding of DevOps, release management, and automated deployment practices.

Success Profile
The ideal candidate is a technically strong z/OS Connect API Engineer who can successfully bridge legacy mainframe environments with modern digital platforms. They possess deep expertise in API enablement, enterprise security, and integration technologies, while contributing to broader modernization initiatives that enhance agility, scalability, and business value.
The base compensation range for this role in the posted location is $73,150 to $174,000
Capgemini provides compensation range information in accordance with applicable national, state, provincial, and local pay transparency laws. The base compensation range listed for this position reflects the minimum and maximum target compensation Capgemini, in good faith, believes it may pay for the role at the time of this posting. This range may be subject to change as permitted by law.
The actual compensation offered to any candidate may fall outside of the posted range and will be determined based on multiple factors legally permitted in the applicable jurisdiction.
These may include, but are not limited to: Geographic location, Education and qualifications, Certifications and licenses, Relevant experience and skills, Seniority and performance, Market and business consideration, Internal pay equity.
It is not typical for candidates to be hired at or near the top of the posted compensation range.
In addition to base salary, this role may be eligible for additional compensation such as variable incentives, bonuses, or commissions, depending on the position and applicable laws.
Capgemini offers a comprehensive, non-negotiable benefits package to all regular, full-time employees. In the U.S. and Canada, available benefits are determined by local policy and eligibility and may include:

• Paid time off based on employee grade (A-F), defined by policy: Vacation: 12-25 days, depending on grade, Company paid holidays, Personal Days, Sick Leave

• Medical, dental, and vision coverage (or provincial healthcare coordination in Canada)
• Retirement savings plans (e.g., 401(k) in the U.S., RRSP in Canada)
• Life and disability insurance
• Employee assistance programs
• Other benefits as provided by local policy and eligibility

Important Notice: Compensation (including bonuses, commissions, or other forms of incentive pay) is not considered earned, vested, or payable until it becomes due under the terms of applicable plans or agreements and is subject to Capgemini's discretion, consistent with applicable laws. The Company reserves the right to amend or withdraw compensation programs at any time, within the limits of applicable legislation.
Disclaimers
Capgemini is an Equal Opportunity Employer encouraging inclusion in the workplace. Capgemini also participates in the Partnership Accreditation in Indigenous Relations (PAIR) program which supports meaningful engagement with Indigenous communities across Canada by promoting fairness, accessibility, inclusion and respect. We value the rich cultural heritage and contributions of Indigenous Peoples and actively work to create a welcoming and respectful environment. All qualified applicants will receive consideration for employment without regard to race, national origin, gender identity/expression, age, religion, disability, sexual orientation, genetics, veteran status, marital status or any other characteristic protected by law.
This is a general description of the Duties, Responsibilities and Qualifications required for this position. Physical, mental, sensory or environmental demands may be referenced in an attempt to communicate the manner in which this position traditionally is performed. Whenever necessary to provide individuals with disabilities an equal employment opportunity, Capgemini will consider reasonable accommodations that might involve varying job requirements and/or changing the way this job is performed, provided that such accommodation does not pose an undue hardship. Capgemini is committed to providing reasonable accommodation during our recruitment process. If you need assistance or accommodation, please reach out to your recruiting contact.
Please be aware that Capgemini may capture your image (video or screenshot) during the interview process and that image may be used for verification, including during the hiring and onboarding process.
Click the following link for more information on your rights as an Applicant in the United States. http://www.capgemini.com/resources/equal-employment-opportunity-is-the-law
Capgemini is a global business and technology transformation partner, helping organizations to accelerate their dual transition to a digital and sustainable world, while creating tangible impact for enterprises and society. It is a responsible and diverse group of 340,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fueled by its market leading capabilities in AI, generative AI, cloud and data, combined with its deep industry expertise and partner ecosystem.