Experience
Experience
From cell-tower KPI analysis to signalling firewalls running in live operator networks — building the systems, deploying them, and explaining them to the people who have to trust them.
Cellusys
Dublin, Ireland
May 2026 — Present
Solutions Engineer
- Design and dimension signalling security solutions — firewall and steering of roaming — for mobile operators worldwide.
- Own the technical side of RFPs and pre-sales, turning an operator’s requirements into a solution, a dimensioning and a deployment plan.
- Run network integration across SS7, Diameter, GTP and 5G.
May 2025 — May 2026
Integration Engineer
- Travelled internationally to lead end-to-end integrations for Tier-1 operators across the Middle East, Africa, South-East Asia and South America, acting as the primary technical contact in high-stakes client meetings to align security architecture with regional infrastructure.
- Led the deployment of unified security across SS7, Diameter, GTP, SIP and HTTP/2.
- Deployed protection for 5G Standalone and LTE networks, using HTTP/2 and SEPP integration to mitigate risk inside authenticated TLS connections.
- Designed and tuned real-time controls against GSMA FS.11, FS.19, FS.20 and FS.36 — defending networks from location tracking, Wangiri and International Revenue Share Fraud through CLI blocking and cross-protocol verification.
- Configured security analytics and post-processing modules for stateful traffic analysis, using node diagnostics and service monitoring to resolve critical latencies and keep system health in check.
March 2024 — September 2024
Software Engineer
- Contributed to core roaming products for mobile operators, including Steering of Roaming and Roam Welcome.
- Worked inside an Agile team on feature development and system performance across a production codebase.
- Built and optimised services across Clojure, Java, JavaScript, AngularJS, Elasticsearch and Kibana.
- Developed a working understanding of SS7, Diameter and SIP, with exposure to LTE, VoLTE and 5G NR.
May 2023 — August 2023
Software Engineer Intern
- API development in Clojure and front-end development in Vue.js.
- First sustained exposure to telecom protocols — SS7, Diameter and SIP — and to how a carrier-grade product is actually built.
Dublin City University
Dublin, Ireland
January 2025 — May 2025
Lab Tutor
- Supported second-year Computer Science students through coursework in SQL, relational databases and query optimisation, on the Introduction to Databases module.
September 2024 — April 2025
Peer Mentor
- Mentored ten first-year Computer Science students through their first year of the degree.
2023 — 2024
Sponsorship & Events Officer, Athletic Boxing Club
- Led sponsorship and event campaigns across a membership of more than 100, contributing to an increase of over 100 members.
- Designed and built a new club website in Next.js, giving the committee something they could keep current themselves.
- Co-wrote a three-year growth plan for the club’s presence inside the university and internationally.
Future Connections
Madrid, Spain
June 2022 — September 2022
Software Engineer Intern
- Built and maintained full-stack web applications in Django, using Plotly, Dash, SQL and Streamlit for interactive interfaces.
- Automated manual reporting workflows with Python and UI Vision, removing recurring work from the team’s week.
- Ran KPI analysis on cell-tower data for multinational telecommunications operators.
Earlier
Ireland, Spain and the United Kingdom
2019 — 2025
Private Tutor
- Maths, languages, programming and design, from secondary school through to first-year university.
2018 — 2021
Waiter
- Wedding catering and restaurant service.
2016 — 2017
Volunteer
- Oxfam, Bath, United Kingdom.
Toolkit
Technologies I work with
Telecom
- SS7 / MAP
- Diameter
- GTP
- SIP
- SMPP
- LTE / VoLTE
- 5G NR & SBA
- Steering of Roaming
Languages
- Clojure
- Java
- JavaScript
- TypeScript
- Python
- C
- SQL
Platforms
- Linux
- Docker
- AWS
- Google Cloud
- Elasticsearch
- Grafana
- PostgreSQL
- Django
- React / Next.js
Practice
- Network integration
- Interoperability testing
- Signalling analysis
- Technical documentation
- Agile delivery
- Spoken languages
- Spanish, English and French — fluent in all three.