Application Support Engineer (AS400)

About Us:

GECO Philippines, part of the GECO Asia Group of Companies, is a specialist IT Consulting Services company with headquarters in Singapore and two delivery centers in the Philippines.

AS400 L3 Application Support Specialist

About the Role

We are looking for an experienced AS400 L3 Application Support Specialist to provide advanced support for AS400/iSeries applications and production environments. This role is responsible for resolving complex incidents, performing root cause analysis, implementing application enhancements, and ensuring the stability and performance of business-critical systems.

What You'll Do

• Investigate and resolve complex incidents escalated from Level 1 and Level 2 Support teams
• Monitor production jobs, batch processes, and application performance
• Perform root cause analysis and implement corrective solutions
• Develop, modify, test, and deploy application fixes and enhancements
• Support incident, problem, and change management processes
• Troubleshoot application failures, job errors, and system issues
• Create and maintain technical documentation and knowledge articles
• Collaborate with business users, developers, QA teams, project managers, and stakeholders
• Participate in continuous improvement and knowledge-sharing initiatives
• Provide after-hours support and participate in weekend on-call rotations when required

Must Have

• Bachelor's degree in Computer Science, Information Technology, Computer Engineering, or a related field
• At least 3 years of experience in programming, application analysis, troubleshooting, and support
• At least 1 year of experience in Level 3 Application Support, Incident Management, Problem Management, and Change Management
• Strong analytical, troubleshooting, and problem-solving skills
• Hands-on experience with AS400 / IBM iSeries environments
• Strong knowledge of:

• COBOL

• RPG

• CL Programming

• AS400 Commands

• Query/SQL 400
  • Experience analyzing user requirements and translating them into technical solutions
  • Ability to test, debug, and support production applications
  • Strong communication and documentation skills
  • Willing to work on rotating shifts and weekend on-call schedules
  • Willing to work onsite at least three (3) days per week

Nice to Have

• Experience supporting enterprise or business-critical applications
• Knowledge of business processes and operational workflows
• Experience working in banking, insurance, retail, logistics, or similar industries
• Exposure to ITIL processes and service management practices
• Experience working with cross-functional teams including Developers, QA, Infrastructure, and Project Management teams
• Experience mentoring junior support team members
• Familiarity with application performance monitoring and production support tools

What We're Looking For

• Professional, honest, and dependable
• Strong attention to detail and sense of ownership
• Resourceful, proactive, and self-motivated
• Team-oriented with excellent collaboration skills
• Able to work effectively under pressure and manage multiple priorities
• Passionate about learning and continuous improvement
• Committed to delivering high-quality support and customer service

Work Schedule & Conditions:

• May require shifting schedules (including mid-shift, night-shift) | Rotating shifts 
• 3 days onsite, 2 days remote

Why Join Us?

• Competitive pay and benefits with opportunities for skill advancement.
• Be part of a collaborative team where your expertise drives real impact.
• Exposure to diverse technologies and global projects.
• Work in a hybrid setup—3 days onsite per week—with flexibility for extended support hours when needed.

How to Apply:

Click the “Apply for this job” button or send your updated resume to kca@geco.asia.