APPLICATION DEVELOPER

Atos

Phoenix (AZ)

On-site

USD 110,000 - 140,000

Full time

14 days+

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Job summary

Atos in Phoenix, AZ is seeking a Senior Mainframe Developer to design, build and support large-scale mainframe applications in production environments.

You will work with COBOL, JCL, CICS, and DB2, ensuring batch and online processing runs reliably while driving performance improvements and modernization initiatives. Collaboration with business users and IT teams will be essential to deliver secure, scalable solutions.

Qualifications

5+ years of experience in mainframe technologies including COBOL, JCL, CICS, DB2, VSAM, IMS, MQ Series, and z/OS.
Hands-on experience with batch processing, online transactions, production support, debugging, and performance tuning.
Exposure to RESTful APIs, Kafka/event-driven systems, ITIL processes, and cloud/mainframe modernization.

Responsibilities

Design, develop, and support complex, large-scale mainframe applications in production environments.
Accountable for system design, batch/online architecture, and performance optimization.
Lead code reviews, enforce JCL standards, and drive CI/CD and release management.
Enable automated deployment across development, QA, UAT, and production mainframes.
Troubleshoot complex issues and provide strategic technical recommendations.
Partner with leadership to design secure, high-performing mainframe solutions and roadmaps.
Mentor junior engineers and contribute to continuous improvement using metrics.

Skills

Mainframe COBOL

JCL

CICS

DB2

VSAM

IMS

MQ Series

z/OS

RESTful API integration

Kafka

ITIL

Control-M

Cloud modernization concepts

Tools

Abend-AID

File-AID

IBM Debug Tool

Tivoli

Splunk

Dynatrace

Kibana

Control-M

Kafka

Job description

About Atos Group

Atos Group is a global leader in digital transformation with c. 56,000 employees and annual revenue of c. €7.2 billion (at the go-forward perimeter), operating in 54 countries under two brands - Atos for services and Eviden for products and systems. European number one in cybersecurity and a leader in cloud, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos Group is the brand under which Atos SE (Societas Europaea) operates. Atos SE listed on Euronext Paris. The purpose of Atos Group is to help design the future of the information space. Its expertise and services support the development of knowledge, education and research in a multicultural approach and contribute to the development of scientific and technological excellence. Across the world, the Group enables its customers and employees, and members of societies at large to live, work and develop sustainably, in a safe and secure information space.

About Eviden

Eviden is the Atos Group brand for hardware and software products with c. € 1 billion in revenue, operating in 36 countries and comprising four business units advanced computing, cybersecurity products, mission‑critical systems and vision AI. As a next‑generation technology leader, Eviden offers a unique combination of hardware and software technologies for businesses, public sector and defense organizations and research institutions, helping them to create value out of their data. Bringing together more than 4,500 world‑class talents and holding more than 2,100 patents, Eviden provides a strong portfolio of innovative and eco‑efficient solutions in AI, computing, security, data and applications.

Position Title Mainframe Developer

Location Phoenix, Arizona

Position Type Full Time

Job Description -

Experienced Senior Mainframe Engineer with strong hands‑on expertise in designing, developing, and supporting complex, large‑scale enterprise mainframe applications in high‑volume production environments.
Accountable for the technical execution of assigned mainframe applications, including system design, batch and online architecture, prototype development, coding, and performance optimization.
Collaborates closely with business users, customers, internal stakeholders, and technical product managers to enhance platform stability, scalability, and operational capabilities.
Leads and enforces mainframe engineering best practices across teams, including code reviews, JCL standards, version control, CI/CD implementation, release management, and production support processes.
Enables teams to implement automated and scalable deployment solutions across development, QA, UAT, and production mainframe environments.
Applies deep industry and domain expertise to identify, troubleshoot, and resolve complex system issues while providing strategic technical recommendations.
Partners with leadership teams to design and implement resilient, secure, and high‑performing mainframe solutions that improve software maturity and operational excellence.
Guides the technical direction of the team and contributes to modernization initiatives and long‑term platform roadmap planning.
Fosters a culture of continuous improvement through mentoring junior engineers, providing actionable feedback, and leveraging operational metrics for performance optimization.
Minimum 5+ years of proven experience in Mainframe technologies including COBOL, JCL, CICS, DB2, VSAM, IMS, MQ Series, and z/OS environments.
Strong experience in batch processing, online transaction systems, production support, debugging, and performance tuning using tools such as Abend‑AID, File‑AID, IBM Debug Tool, Tivoli, Splunk, Dynatrace, and Kibana.
Hands‑on experience with RESTful API integration, Kafka/event‑driven systems, ITIL processes, scheduling tools like Control‑M, and exposure to cloud and mainframe modernization concepts is an added advantage