APPLICATION DEVELOPER

Atos SE; Phoenix (AZ); On-site; USD 120,000 - 160,000; Full time

Job summary

Atos Group in Phoenix, Arizona seeks a Senior Mainframe Developer to design, build, and support large-scale mainframe applications. You will drive technical execution, including batch and online architecture, code reviews, and release management, while collaborating with business users and product teams to enhance stability and performance.

The role emphasizes mentoring junior engineers, promoting best practices, and supporting modernization initiatives in a high-volume environment within an

Qualifications

• Minimum 5+ years of proven experience in Mainframe technologies (COBOL, JCL, CICS, DB2, VSAM, IMS, MQ Series, z/OS).
• Strong experience in batch processing, online transaction systems, production support, debugging, and performance tuning.
• Experience with RESTful APIs, Kafka/event-driven systems, ITIL processes, and scheduling with Control-M.
• Exposure to cloud and mainframe modernization concepts.

Responsibilities

• Design, develop, and support mainframe applications in high-volume environments.
• Lead technical execution including system design, batch/online architecture, and release management.
• Collaborate with business users and product managers to improve stability and scalability.
• Mentor junior engineers and contribute to modernization roadmaps.

Skills

Mainframe engineering

COBOL

JCL

CICS

DB2

VSAM

IMS

MQ Series

z/OS

Batch processing

Online transactions

Production support

Performance tuning

RESTful APIs

Kafka / event-driven

ITIL processes

Control-M

Cloud & modernization

Tools

Abend-AID

File-AID

IBM Debug Tool

Tivoli

Splunk

Dynatrace

Kibana

Control-M

Job description

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.

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

Responsibilities & Qualifications

• 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.

Atos is committed to a fair work environment for all.