Senior Java & IBM i Engineer (AS/400) - L3/L4 Support

TMS LLC; Oregon; Hybrid; USD 150,000 - 190,000; Full time

Job summary

TMS LLC is seeking a senior Java engineer for L3/L4 support, development, and architectural input. The role emphasizes production support, complex integrations with IBM i/AS400, and driving root-cause analysis within ITIL-aligned processes.

You will troubleshoot escalated incidents, design robust Java solutions, mentor junior staff, and collaborate with DevOps, QA, and vendor teams. Remote-friendly with strict incident management expectations.

Qualifications

• 15+ years total IT experience with strong Java development and support.
• L3/L4 support background with complex defect analysis and fixes.
• Extensive hands-on IBM i (AS/400) experience.

Responsibilities

• Provide L3/L4 support for business-critical apps and perform root cause analysis.
• Design, develop, and deploy complex Java solutions interfacing with IBM i/AS400.
• Contribute to architecture decisions and modernization efforts.
• Manage incidents, changes, and service requests per ITIL and SLAs.
• Plan and track work in JIRA; participate in design, build, test, and deployment.

Skills

Java

L3/L4 support

IBM i / AS400

REST/SOAP

JIRA / Agile

ServiceNow ITSM

Code reviews

CI/CD

SQL / DB2

Architecture input

Tools

ServiceNow

JIRA

Git / Bitbucket

IBM i tooling

JT400/JTOpen

Job description

TMS LLC is seeking a senior Java engineer for L3/L4 support, development, and architectural input. The role emphasizes production support, complex integrations with IBM i/AS400, and driving root-cause analysis within ITIL-aligned processes.

You will troubleshoot escalated incidents, design robust Java solutions, mentor junior staff, and collaborate with DevOps, QA, and vendor teams. Remote-friendly with strict incident management expectations.