Core Residential Engineer
First Point Group
Job Description
Engagement: Own consultant company or via P&P
Duration: 6 months, with potential extension
Role Overview
We are looking for an experienced Core Resident Engineer with strong Nokia MSS/MGW expertise to provide dedicated technical support Circuit Switched (CS) Core network.
The successful candidate will act as a key technical interface between customer operations, engineering teams, and vendor support organisations. The role will focus on maintaining network stability and performance while supporting troubleshooting, network changes, optimisation, capacity planning, modernisation, and ongoing operational improvements.
You will work across Nokia CS Core platforms, Oracle SBCs, and teleSys SS7/Voice Firewall environments, providing Tier-3 technical expertise and supporting critical incidents and network transformation activities.
Key Technical Requirements
SS7 & Signalling
Strong hands-on knowledge of:
- SS7 and SIGTRAN
- M3UA and SCTP
- ISUP and MAP
Voice Core & Media
- H.248 / MEGACO
- BICC
- SIP and SIP-I
- Voice codecs including AMR, AMR-WB and G.711
Mobile CS Core Architecture
Extensive experience across 2G/3G Circuit Switched Core networks, including:
- A Interface
- Iu-CS
- Nc, Nb and Mc interfaces
- TDM / E1
- ATM
- IP networking
- Hands-on operational experience with Nokia DX200 and ATCA-based MSS/MGW
- Strong CLI-based troubleshooting capabilities
- Hardware administration and platform support
- Experience with cloud-based voice core solutions is an advantage
- Major incident and outage management
- Network recovery and service restoration
- Protocol trace capture and analysis
- Emergency patch implementation
- Root Cause Analysis (RCA)
Experience with diagnostic tools such as Wireshark, Tektronix and Iris/GEO is required.
Network Maintenance & Optimisation
Experience with:
- Capacity planning and management
- Planned maintenance activities
- Change implementation and governance
- CSFB
Network Transformation
Experience supporting 3G network sunset and modernisation programmes, including:
- Traffic refarming
- Interconnect optimisation
- Voice routing changes
Knowledge of the Irish interconnect and voice-routing environment would be highly beneficial.
Customer & Regulatory Experience
The ideal candidate will also have experience with:
- 112/999 emergency call routing
- Lawful Interception requirements
- Customer-facing technical support
- SLA management
- Tier-3 technical escalations
Key Responsibilities
- Provide onsite technical ownership for the Nokia CS Core environment.
- Troubleshoot complex MSS/MGW, signalling and voice-related issues.
- Lead or support major incident resolution and service restoration.
- Analyse signalling and protocol traces to identify network faults and performance issues.
- Coordinate with customer teams and external vendors on technical escalations.
- Support upgrades, patches, maintenance windows and network changes.
- Monitor network health, capacity and operational performance.
- Contribute to network optimisation and modernisation initiatives.
- Support 3G sunset, traffic migration and voice-core transformation programmes.
- Ensure changes are delivered in line with operational, SLA and governance requirements.
- Provide technical input into RCA, problem management and continuous improvement activities.