Available for opportunities

Ranbir Kumar
Telecom Designer

Network infrastructure specialist with 15+ years designing fiber networks across India, New Zealand, and Australia. Building cybersecurity skills to bridge network design and security operations — because knowing how networks are built helps understand how they can be broken.

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15+
Years experience
15k+
km fiber deployed
$10M+
Infrastructure managed
2k+
Site surveys conducted
Career

Experience

Apr 2023 – Jun 2025
Network Designer — Ventia Australia Pty Ltd
West End, Brisbane QLD · NBN FTTH
  • Planned and executed detailed network designs using CAD, incorporating PNI updates
  • Developed in-house design solutions for SD1 and SD2 projects
  • Performed QA for offshore teams, ensuring quality standards were met
  • Managed project tasks and communicated status updates with diverse stakeholders
NBN FTTHCADQAPNI
Oct 2013 – Apr 2023
Network Designer — Ventia NZ Pty Ltd
Auckland, New Zealand · Chorus NZ
  • Design and deployment of nationwide fiber optic network spanning 15,000+ km with 99.99% reliability
  • Managed $10M+ in infrastructure projects, consistently delivering on time and under budget
  • First employee to implement schematic cutover process, reducing service disruption by 90%
  • Utilized automation tools to reduce design time by 30% and improve accuracy
  • Conducted 2000+ site surveys and field inspections across diverse geographic locations
Chorus NZFiber OpticsGreenfieldAutomation
Jan 2009 – Jan 2013
Network Operations Engineer — BSNL
Punjab, India · PSTN & Media Gateway
  • O&M of CDOT MBM XL tandem switch achieving 99.9% uptime for critical services
  • Root cause analysis and troubleshooting for complex network issues
  • Configured and maintained Ericsson EMS for network monitoring and management
  • Tracing and debugging of signaling issues across the network
PSTNCDOT MBM XLEricsson EMSMedia Gateway
Jul 2006 – Jan 2009
Engineering Assistant — All India Radio
Goraya, Punjab, India · AM & FM Transmission
  • Maintenance of high power AM transmitters (2×100 kW and 300 kW), achieving 99.9% uptime
  • Studio to transmitter link (STL) maintenance ensuring reliable broadcast communication
  • Tuning and optimization of RF parameters for enhanced signal strength
RFAM/FMSTLTransmitters
Self-hosted & Security

Home Lab & Projects

NixOS Desktop running
Intel i5-6500 running NixOS 26.05. Full declarative config with flakes, sops-nix secrets, and custom modules for all services.
NixOSFlakessops-nix
Bitcoin Node running
Bitcoin Knots full node with LND Lightning Network on Umbrel. Automated daily backups via systemd timers over Tailscale mesh.
BitcoinLightningLND
SIEM Stack running
Grafana + Loki + Fluent Bit pipeline ingesting router syslog from OpenWrt via syslog-ng. Automated alert rules for failed auth, service anomalies, and firewall blocks.
LokiFluent BitGrafanaDetection Rules
Network Security running
OpenWrt with BanIP, AdGuard Home, and unbound DNS. syslog-ng aggregating firewall blocks, DNS queries, and auth attempts. VLAN segmentation for service isolation.
BanIPAdGuardVLANsUnbound
Mesh Network running
Tailscale mesh across NixOS desktop, MacBook Air M3, Umbrel, and iPhone. GL-iNet AR750S with hardened DNS and firewall rules.
TailscaleWireGuardOpenWrt
HackTheBox learning
Actively working through HackTheBox machines to develop offensive security skills. Understanding attacker techniques to inform better network defence and detection engineering.
CTFPentestingOffensive basics
Self-hosted Services running
Nextcloud, CouchDB (Obsidian LiveSync), Vaultwarden, Linkwarden, Gitea — all declaratively managed via NixOS modules with nginx reverse proxy and Let's Encrypt.
NextcloudVaultwardenGitea
Local AI Stack running
Ollama on MacBook Air M3 with Open WebUI on NixOS served over Tailscale. RenderCV + Ollama pipeline for automated CV tailoring from job descriptions.
OllamaLM StudioOpen WebUI
Expertise

Skills

Network Design
CAD, Fiber Optics, NBN FTTH, Chorus Infrastructure, Network Planning, PNI, Greenfield
Telecom Infrastructure
PSTN Switch, Ericsson EMS, Media Gateway, CDOT MBM XL, RF Transmission, STL
Systems Administration
NixOS, Linux, Ubuntu, Docker, Nix Flakes, systemd, Fish Shell, Bash
Networking
Tailscale, WireGuard, OpenWrt, Unbound DNS, Nginx, VLANs, GL-iNet
Security developing
SIEM, Loki, Fluent Bit, Detection Engineering, BanIP, AdGuard, Firewall Rules, Log Analysis, Network Segmentation, HackTheBox
Observability & DevOps
Grafana, Loki, Prometheus, syslog-ng, Gitea, CI pipelines, systemd timers
Document

Resume

Ranbir_Kumar_CV.pdf
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Connect

Contact

✉ balenordic@tutamail.com ☎ +61 411 632 769 LinkedIn → GitLab →