Sr Subject Matter Expert(Tools & Automation)

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HCLTech is seeking a Senior Subject Matter Expert in Tools & Automation with L3 Mainframe Network Engineering experience on z/OS. The role involves owning and operating z/OS Communications Server networking, ensuring reliability, performance, and security for critical workloads. Responsibilities include designing, implementing, and supporting complex network configurations, troubleshooting issues, and ensuring high availability.

Job Summary

To ensure on-time resolution of escalations/incidents through efficient analysis as per the SLA, quality norms and ensure positive customer satisfaction and contribute to EN business creation.

Key Responsibilities

L3 Mainframe Communications / Network Engineer (z/OS)

About the Role

We are looking for L3 Mainframe Network Engineer to own and operate z/OS Communications Server networking across complex, multi-LPAR Sysplex environments. You’ll be the final escalation for TCP/IP, VTAM/EE, OSA/, Sysplex Distributor/DVIPA, and AT-TLS/IPSec—ensuring reliability, performance, and security for mission-critical workloads (CICS, IMS, Db2 DDF, MQ, z/OS Connect).

Key Responsibilities

· Be an architect for z/OS Communications Server for multiple customers

· Design, implement, and support z/OS TCP/IP stack configs: profiles, PAGENT (AT-TLS, IPSEC), OMPROUTE, VIPA/DVIPA, Sysplex Distributor, port sharing, and policy routing.

· Own SNA/VTAM and Enterprise Extender (HPR/IP) design and migration patterns; manage VTAM definitions and APPN nodes.

· Manage network security on z/OS: AT-TLS/IPSec, cipher policies, certificate use (with platform security team)

· Operate and tune TN3270E, FTP/FTPS/SFTP, SSH, Connect:Direct, CSSMTP, and other comms subsystems.

· Troubleshoot complex issues using packet traces, IPCS, SMF 119, NETSTAT, Comm Server traces; coordinate with enterprise Network/IAM/Security teams.

· Ensure high availability: Sysplex-aware routing, failover, capacity planning, DR readiness, and change reliability.

Required Skills & Experience

· 8+ years total IT with 5+ years in z/OS networking (Comm Server, VTAM/EE).

· Deep hands-on with: TCP/IP on z/OS, PAGENT (AT-TLS/IPSec), OMPROUTE, VIPA/DVIPA, Sysplex Distributor, OSA-Express.

· Strong in tracing: IPCS packet trace, SYSTCP* logs, SMF 119, zERT, z/OS Comm Server diagnostics, Wireshark (offloaded).

· Experience with NetView, SA z/OS,

· Solid knowledge of CICS IPIC/HTTP, IMS Connect, Db2 DDF, MQ z/OS Connect EE connectivity patterns.

· Scripting with REXX, JCL, basic shell on USS; change/incident/problem (ITIL).

Nice to Have

· Knowledge in z/OSMF

· Load balancing integrations (A10/F5) with Sysplex Distributor

· Certifications: IBM z/OS Networking, ITIL Foundation

Skill Requirements

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Other Requirements

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#mainframe#networking#z/OS#L3 support#automation#security#high availability#ITIL