Principal Application Support Engineer; IBM z​/OS Platform

Company Description

ATPCO is the world's primary source for air fare content, holding over 200 million fares across 160 countries. Every day, the travel industry relies on ATPCO's technology and data solutions to help millions of travelers reach their destinations efficiently. Join us and contribute to the development of innovative applications that power global travel. ATPCO is everywhere people buy flights.

We’re not just shaping the future of air travel– we’re redefining how and where great work happens. At ATPCO, we believe in flexibility, trust, and a culture where your wellbeing comes first.

✅Remote-First Culture– Flexibility to work from home in your country of hire

✅“Leave Your Way” PTO– Take the time you need, when you need it

✅401(k) with Generous Employer Match– Invest in your future

✅Comprehensive Benefits– Medical, dental, vision, & mental health

✅Global Tuition and Gym Reimbursement– Learn and grow on us

✅Standby Flight Program– Explore the world

✅Inclusive, Collaborative Culture– Be seen, heard, and valued

We’ve built a remote-first culture rooted in trust, transparency, and belonging. With open-door leadership, weekly 1:1s, and real-time recognition, we keep our people connected and valued—no matter where they work.

Our cultural pillars of Collaboration, Empowerment, Innovation, Learning, Transparency, and Trust guide how we show up for one another and grow together.

As a Principal Application Support Engineer (IBM z/OS Platform) at ATPCO, you will be responsible for the implementation, enhancement, and maintenance of a wide range of ATPCO applications and services. In this role, you will collaborate with cross-functional teams to design and develop software solutions that align with business objectives, ensuring high performance, scalability, and reliability. You'll also play a critical role in improving existing applications, integrating new features, and maintaining system functionality to meet evolving business needs.

• Provide 24x7 Tier 2 support for all ATPCO applications and systems during both day and night oncall rotations, including weekends and holidays

• Serve as the technical lead for diagnosing and resolving critical production incidents in mainframe and distributed applications.

• Proactively resolve complex technical issues, managing multiple tasks while ensuring timely and quality results.

• Act as a technical mentor and resource for engineering teams, providing guidance on best practices and fostering team collaboration.

• Stay current with emerging technologies, driving continuous improvements in development processes and application delivery.

• Collaborate cross-functionally to meet business objectives, ensuring smooth communication between teams and stakeholders

• Share knowledge with peers and the wider organization, contributing to a culture of continuous learning and improvement.

• Develop proactive monitoring, alerting, and self-healing capabilities for applications and APIs.

• Analyze operational trends, volume surges and application logs to anticipate issues before they impact customers.

• Manage Severity 1 and 2 incidents and outages—from initial troubleshooting, vendor engagement, and outage communication to escalation and bridge management—ensuring effective internal and external communication and customer satisfaction.

• Provide support during business hours for non-production environments.

• Perform application and database maintenance activities such as MPM data uploads, historical data migrations, back-door data fixes, and addressing customer subscription data processing issues.

• Maintain and update COBOL programs and JCL.

• Maintain a deep understanding of the ATPCO enterprise environment to quickly diagnose and resolve issues, while staying informed about changes to ATPCO applications and technologies

• Collaborate with PSS Tier 1 to maintain and optimize Control-M/EM batch processing jobs.

• Monitor systems such as Service Now, Splunk On-Call, application alerts, and group emails, and respond to issues in a timely manner.

• Monitor scheduled Applications performance metrics and prepare ad hoc reports for IT management using DB2 SQL…