Bangalore, Karnataka
Job Summary
To ensure on-time resolution of escalations/incidents through effective 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

#body.unify div.unify-button-container .unify-apply-now: focus, #body.unify div.unify-button-container .unify-apply-#body.unify div.unify-button-container .unify-apply-now: focus, #body.unify div.unify-button-container .unify-apply-

📌 SrSubject Matter Exprt(Tools&Automation) (India)
🏢 HCLTech
📍 India