Lead Systems Platform Architect / Infrastructure Architect – F5

Oliver James Group; Dublin; Hybrid; EUR 101,000 - 166,000; Full time

Job summary

Oliver James Group is seeking an infrastructure architect for a 12-month initial contract in Dublin. The role focuses on delivering secure, high-performing internet infrastructure with emphasis on F5 GTM/LTM, DNS and networking, and involves producing architecture designs and technical documentation.

You will gather stakeholder requirements, translate them into high-level designs and work with application teams, architects and engineers in a hybrid Dublin setup.

Qualifications

• Strong hands-on experience with F5 GTM/LTM, DNS and networking.
• Advanced knowledge of load balancers and Web Application Firewalls (WAFs).
• Working knowledge of cloud and database technologies.
• Understanding of Zero Trust Architecture and network micro-segmentation.
• Experience with YAML-based deployments and infrastructure design documentation.

Responsibilities

• Design, implement and support secure, scalable internet infrastructure and middleware solutions.
• Configure and troubleshoot F5 GTM/LTM, DNS and networking issues.
• Produce and maintain TADs, infrastructure diagrams and technical docs.
• Troubleshoot performance issues and assist in capacity planning.
• Collaborate with cross-functional teams and stakeholders.

Skills

F5 GTM/LTM

DNS

Networking

Load Balancers

WAFs

Cloud

Databases

Zero Trust

Micro-segmentation

YAML deployments

Tools

Microsoft Visio

Job description

12-month initial contract
Day rate
Hybrid in Dublin

Role Overview

The role involves working with application teams, architects, engineers and stakeholders to gather requirements, develop technical designs and produce Technical Architecture Documents (TADs).

Overall Objective

To deliver and support secure, reliable and high-performing infrastructure solutions, with particular emphasis on F5 traffic management, DNS and networking, while meeting organisational architecture and operational standard.

Key Responsibilities

• Design, implement and support secure, scalable internet infrastructure and middleware solutions.
• Configure and troubleshoot F5 technologies, including Global Traffic Managers (GTM) and Local Traffic Managers (LTM).
• Manage and troubleshoot DNS, networking and traffic management solutions.
• Gather stakeholder requirements and translate them into high-level technical designs.
• Produce and maintain TADs, infrastructure diagrams, logical flows and technical documentation using Microsoft Visio or similar tools.
• Troubleshoot infrastructure issues and perform performance tuning, capacity planning and configuration management.
• Monitor production environments to maintain system stability, availability and performance.
• Evaluate emerging technologies and contribute to infrastructure projects and implementations.

Technical Skills and Experience

• Strong, hands‑on experience with F5 GTM and LTM, DNS and networking is essential. Candidates must demonstrate practical implementation, configuration and troubleshooting experience.
• Strong understanding of networking, operating systems, web servers, application servers and web middleware.
• Experience in internet infrastructure design and/or web administration.
• Advanced knowledge of load balancers and Web Application Firewalls (WAFs).
• Working knowledge of cloud and database technologies.
• Understanding of Zero Trust Architecture and network micro‑segmentation.
• Experience with YAML‑based deployments.
• Experience using Microsoft Visio or similar tools for infrastructure design and documentation.
• Strong troubleshooting, analytical and technical documentation skills.

Personal Attributes

• Proactive, detail‑oriented and results‑driven, with the ability to work independently under pressure.
• Strong communication, collaboration and stakeholder management skills.
• Able to manage multiple priorities and work across geographically distributed teams.
• Quick to learn new technologies and demonstrate initiative and ownership.

Typical Day and Stakeholder Interaction

The role combines hands‑on infrastructure engineering, design and operational support. Activities include configuring and troubleshooting F5 GTM/LTM, managing DNS and networking, developing architecture designs, resolving performance issues and collaborating with application, infrastructure and operational teams.