Senior Mainframe API Developer

Hybrid role urgent client needs Senior Mainframe API Developer

Senior Mainframe API Developer (z/OS Connect)

Hartford, CT 06103 Hybrid

6 Months

Must Have Skills:

5+ years of experience in IBM z/OS application development (multiple client engagements).

Hands-on experience with z/OS Connect Enterprise Edition.

Proven experience with:

o Inbound APIs: Cloud z/OS Connect CICS and/or IMS o Outbound APIs: CICS Cloud-based REST APIs

Strong knowledge of CICS TS and/or IMS TM environments.

Experience working with COBOL (or PL/I) backend programs.

Solid understanding of RESTful API design, HTTP methods, JSON, and OpenAPI.

Familiarity with security concepts such as OAuth 2.0, TLS, and API authentication.

Nice to Have Skills:

Experience with API management platforms (e.g., IBM API Connect).

Knowledge of MQ, DB2, and VSAM data access patterns.

Familiarity with Changeman

Experience integrating mainframe workloads with public cloud platforms (AWS, Azure, or Google Cloud Platform).

Understanding of z/OS system concepts, including SMF, ACF2, and workload management.

z/OS Connect Enterprise Edition server configuration specifically server.xml.

Detailed Job Description:

We are seeking an experienced z/OS Connect Applications Developer to design, develop, and support API-based integrations between IBM Z platforms and cloud systems. This role focuses on both outbound integrations (CICS Cloud APIs) and inbound integrations (Cloud APIs z/OS Connect endpoints) connecting to CICS and/or IMS transaction processing environments.

The ideal candidate has strong mainframe application experience, hands-on knowledge of z/OS Connect EE, and a solid understanding of modern RESTful API design and cloud integration patterns.

Key Responsibilities

API Design & Development

Design, build, and maintain RESTful APIs using z/OS Connect Enterprise Edition (EE).

Develop inbound APIs exposing CICS and/or IMS transactions via z/OS Connect endpoints.

Develop outbound API integrations enabling CICS applications to securely invoke cloud-based REST APIs.

Define and maintain API contracts using OpenAPI / Swagger specifications.

Mainframe Integration

Integrate z/OS Connect with CICS Transaction Server and/or IMS TM applications.

Configure and manage service archives (SAR), z/OS Connect services, and related artifacts.

Work with COBOL, PL/I, or assembler-based backend programs to support API enablement.

Security & Governance

Implement authentication and authorization using OAuth 2.0, JWT, TLS, and certificates.

Ensure APIs conform to enterprise security, data protection, and compliance standards.

Collaborate with platform and security teams to support API lifecycle management and governance.

Operations & Support

Troubleshoot and resolve API integration, performance, and connectivity issues.

Monitor API usage and performance using z/OS Connect logs and enterprise monitoring tools.

Support deployment automation and CI/CD pipelines for z/OS Connect and related components.

Collaboration

Work closely with cloud, distributed systems, and application teams to design end-to-end solutions.

Participate in architecture reviews, code reviews, and design discussions.

Create and maintain technical documentation and integration runbooks.

Required Qualifications

5+ years of experience in IBM z/OS application development (multiple client engagements).

Hands-on experience with z/OS Connect Enterprise Edition.

Proven experience with:

o Inbound APIs: Cloud z/OS Connect CICS and/or IMS o Outbound APIs: CICS Cloud-based REST APIs

Strong knowledge of CICS TS and/or IMS TM environments.

Experience working with COBOL (or PL/I) backend programs.

Solid understanding of RESTful API design, HTTP methods, JSON, and OpenAPI.

Familiarity with security concepts such as OAuth 2.0, TLS, and API authentication.

Preferred / Nice-to-Have Skills

Experience with API management platforms (e.g., IBM API Connect).

Knowledge of MQ, DB2, and VSAM data access patterns.

Familiarity with Changeman

Experience integrating mainframe workloads with public cloud platforms (AWS, Azure, or Google Cloud Platform).

Understanding of z/OS system concepts, including SMF, ACF2, and workload management.

z/OS Connect Enterprise Edition server configuration specifically server.xml.

Soft Skills

Strong analytical and problem-solving abilities.

Excellent written and verbal communication skills.

Ability to collaborate effectively across mainframe, cloud, and distributed teams.

Comfortable working in a hybrid legacy-modern technology environment.

Minimum Years of Experience: 8+ years

Best regards,

Alvin Stuart - Lead IT Recruiter

Direct Number:

Email:

Hangout:

Princeton Forrestal Village;

CPUC, NCMSDC MBE

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