UK

United Kingdom · Technology and data · Lead (8-12 years)

Lead Network Engineer (Optimisation)

Here is the whole job, in plain words. What it is, what you decide, how you're judged, how people get here and where they go next. Then the part no course gives you: twelve AI tutors who learn your work.

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  • Experience bandLead (8-12 years)
  • Direct reports3-8 reports
  • Reports toPrincipal Network Architect
  • UK framework levelUsually a manager, or the deepest specialist in a team

Also advertised as Staff Network Optimisation Engineer · Network Optimisation Lead · Principal Network Performance Engineer

Built on 43,079 real UK job descriptions we analysed · grounded in qualifications employers recognise

Two short quizzes about you

1From this job to a course

The qualifications matched to this job

Qualifi Level 5 Extended Diploma in IT-Networking Qualifi Ltd · Level 5 · covers 4 of 10 standards
Qualifi Level 5 Diploma in IT-Networking Qualifi Ltd · Level 5 · covers 4 of 10 standards
Qualifi Level 5 Extended Diploma in Information Technology Qualifi Ltd · Level 5 · covers 4 of 10 standards
Qualifi Level 5 Diploma in Information Technology Qualifi Ltd · Level 5 · covers 3 of 10 standards
Qualifi Level 5 Extended Diploma in Networking and Cyber Security Qualifi Ltd · Level 5 · covers 2 of 10 standards

Matched from the standards this job is measured against: a suggestion, not an official ruling.

The units you would start with

Network Design and Administration Qualifi Level 5 Extended Diploma in IT-Networking
Operations Management in a Workplace Setting NOCN Level 5 Diploma in Computer Engineering (Information Technology and Data Science)

The future skills this job leans on

Data Fluency turning numbers into a decision
Automation Fluency building AI into how work runs
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Your Plan Illustration

Built for Lead Network Engineer (Optimisation)

2 units that map to this job, from the qualifications that cover it.

  1. Network Design and Administration Qualifi Ltd · covers 4 of 10 standards Level 5
  2. Operations Management in a Workplace Setting NOCN · covers 1 of 10 standards Level 5
These are the real units behind this job, in the order they rank for it. Nothing here is marked done, because this plan has not been started by anyone yet. Yours would fill in as you go.

2AI and this work

Will AI change your work as a Lead Network Engineer (Optimisation)?

Nobody can say exactly how. Here is what this job is being asked for next, and where to start.

The new skills this role is being asked for

  • Network Observability Engineering
  • Network-as-Code & CI/CD for Network Changes
Why each one is rising

The future skills this job leans on

We'll only ever tell you what we can actually back up. No hype, no scare tactics.

What happens when you start

Next, a free account. We build your Lead Network Engineer (Optimisation) plan as you set up, starting with a Future Fluency module on using AI in your job. No card.

Your first Future Fluency module is free. After that, your AI tutor is £70 a month.

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3What this role really is

A lead network engineer optimising network performance finds why systems slow down and designs fixes that last. The role involves hands-on leadership, mentoring others and shaping how systems perform over time.

4What you'd actually use

The tools this job runs on, and how well you'd need to know each one.

Datadog / LogicMonitor Expert

You'll be building custom dashboards, configuring complex alert triggers using multiple data sources (not just out-of-the-box stuff), and writing custom scripts to pull specific metrics from network devices for deep-dive analysis and proactive monitoring. This is where you'll spot those 'chasing ghosts' before they become real problems.

Wireshark (Expert) Expert

You'll be writing advanced capture and display filters, reconstructing TCP streams to understand application behaviour, analysing protocol handshakes in-depth, and using command-line tools (like tshark) for automated analysis of large packet captures. This is your scalpel for network forensics.

Python (Netmiko/NAPALM) Advanced

You'll be writing custom Python scripts to automate complex, multi-step network tasks, pull operational data via APIs for reporting, and perform configuration validation across hundreds of devices. This is how we make our network more efficient and less prone to human error.

Ansible (Advanced) Advanced

Beyond just running playbooks, you'll be designing and writing complex Ansible playbooks and roles for pushing standardised configuration changes, managing network device inventory, and orchestrating larger automation workflows. You'll also be integrating Ansible with other systems for a more cohesive automation strategy.

Splunk (SPL) / ELK Stack (Lucent) Advanced

You'll be writing complex search queries to correlate events across multiple device types (firewalls, routers, servers). This involves building custom dashboards and alerts for proactive threat detection and performance monitoring, helping us identify issues before they impact users. You're essentially a detective, using logs as your clues.

GNS3 / EVE-NG (Advanced) Advanced

You'll be creating complex, multi-vendor simulations of entire production environments in a lab setting. This is crucial for validating major architectural changes, testing BGP routing policies, or modelling failure scenarios before they ever touch our live network. It's your playground for 'what if' scenarios.

5What you get to decide, and how that grows

Power in a job isn't your title. It's what you're allowed to decide. Here's how it grows as you move up.

The choiceComing in Where you are nowThe step above
Technical Design & Implementation Follows prescribed designs; escalates any deviations. Chooses implementation approach for routine designs; consults on complex variations. Designs and implements solutions within a defined workstream; consults on architectural impact.
Project Scope & Timelines Executes tasks within given timelines; reports delays. Manages project segments; proposes minor timeline adjustments to manager. Owns workstream timelines; makes recommendations for project-level changes.
Vendor Selection & Tooling Uses approved tools; reports issues with tools. Recommends specific tools for routine tasks within existing budget. Evaluates and recommends new tools for specific workstream needs (up to £5K spend).
Team Mentorship & Development Seeks guidance from senior colleagues. Provides informal guidance to new joiners. Mentors 0-2 junior engineers; provides technical feedback.

6How you'll be judged

The scoreboard, and what is not on it. The hard targets, how often each is actually looked at, and the quiet signals that never reach a dashboard.

Critical Application Latency Reduction
The average latency for our top 5 business-critical applications (e.g., CRM, ERP, core trading platform) across the network.
Target · Reduce by 10% Quarter-on-Quarter (QoQ)

If the CRM application's average network latency was 80ms last quarter, your target is to get it down to 72ms or less this quarter. We'd track this using our network monitoring tools and application performance metrics.

Network Mean Time to Resolution (MTTR)
The average time it takes to fully resolve network-related incidents, from detection to verified fix.
Target · Improve by 20% Annually

If our current MTTR for P1/P2 network incidents is 60 minutes, your goal would be to bring that down to 48 minutes or less over the next year, perhaps through better automation or diagnostic tools you've implemented.

Optimisation Project Delivery
The number of medium-to-large scale network optimisation projects (e.g., SD-WAN rollout, BGP tuning, cloud connectivity improvements) completed on time and within budget.
Target · Lead 3+ projects per year, 90% on-time/on-budget

Successfully delivering a new QoS policy across all branch offices by the end of Q2, and then rolling out a new cloud peering architecture in Q4, both without budget overruns or significant delays.

Network Capacity Utilisation Efficiency
The efficiency of how we use our network bandwidth, ensuring we're not over-provisioning or under-provisioning links.
Target · Maintain core network link utilisation between 40-70% during peak hours, with less than 5% packet loss.

Identifying a core link consistently running at 85% during peak times and designing a cost-effective upgrade or re-routing strategy before it becomes a bottleneck, keeping it within the target range.

Architectural Design Quality
How robust, scalable, and maintainable your network designs and optimisation proposals are, balancing performance with practical implementation and future needs.
  • Designs are peer-reviewed positively by Principal Architects. Solutions are deployed with minimal post-implementation issues. Your proposals clearly consider long-term operational impact and cost-effectiveness. You're seen as the go-to person for complex design challenges.
Technical Leadership & Mentorship
Your ability to guide, support, and develop junior and mid-level engineers, helping them grow their technical skills and problem-solving capabilities.
  • Junior engineers actively seek your advice and feedback. You regularly run workshops or knowledge-sharing sessions. You successfully mentor at least one junior engineer to a promotion within 18 months. Your team's overall technical proficiency improves under your guidance.
Cross-Functional Influence
How effectively you can get other teams (like Application Development, Security, or Operations) on board with your network optimisation strategies and changes.
  • You're proactively invited to early-stage project planning meetings by other departments. Your recommendations are frequently adopted by other teams without significant pushback. You can clearly explain complex network issues to non-technical audiences and get their buy-in for solutions.
Documentation & Knowledge Sharing
The clarity, accuracy, and completeness of the documentation you produce for designs, configurations, and troubleshooting guides, making it easier for everyone else.
  • Your documentation is consistently up-to-date and easy for other engineers to follow. New team members can quickly get up to speed on your projects using your guides. You contribute regularly to our internal knowledge base, making sure critical information is captured.

7Would you like it

Both sides. What people enjoy, and what grinds them down.

What people enjoy
Solving Tough, Complex Puzzles

You get a real buzz from diving deep into a tricky network performance issue, piecing together data from various tools, and finally pinpointing the obscure root cause. The more challenging the problem, the more engaged you are.

Spending a full day tracing intermittent packet loss across a hybrid cloud connection, eventually discovering a subtle misconfiguration in a Transit Gateway route table that no one else spotted.

Building and Improving Things

You love designing new network architectures or optimising existing ones, seeing your plans go from whiteboard to production. There's satisfaction in knowing you've made a tangible difference to how our network performs.

Leading the design and implementation of a new SD-WAN overlay that significantly improves application performance for our remote offices, and then seeing the positive feedback from users.

Mentoring and Developing Others

You enjoy sharing your knowledge, guiding junior engineers through complex problems, and seeing them grow. You're happy to spend time explaining concepts or reviewing code, knowing it helps the whole team get better.

Helping a junior engineer debug a tricky BGP peering issue over several days, patiently explaining each step and guiding them to find the solution themselves, ultimately building their confidence.

What frustrates people
  • Being the 'network guy' blamed for every IT issue, regardless of the actual root cause.
  • Dealing with legacy network debt and outdated hardware that limits optimisation possibilities.
  • Slow, bureaucratic change management processes that delay critical fixes and improvements.
  • Lack of accurate documentation from other teams, leading to wasted troubleshooting time.
  • Stakeholders who expect 'magic packets'—instantaneous global connectivity despite the laws of physics.
What this role does not give you
  • A purely greenfield environment with no legacy systems to manage.
  • Complete control over all aspects of IT infrastructure (you'll need to influence, not dictate).
  • A quiet, predictable workload with no urgent, high-pressure incidents.
  • A role where you can avoid explaining complex technical details to non-technical people.

8Who you work with

This role directly shapes the performance, stability, and future direction of our network infrastructure. Your designs and optimisation projects will influence how quickly we can roll out new services, how resilient our systems are to outages, and how efficiently we use our network resources. Get it right, and you'll enable significant business growth; get it wrong, and you're looking at widespread service degradation and unhappy customers. It's a pretty big deal, frankly.

Inside the business
  • VP of Infrastructure
  • Peer Lead Engineers (e.g., Security, Cloud, Systems)
  • Application Development Leads
  • Operations Team Leads
  • Security Architecture Team
  • Product Management
Outside the business
  • Network Hardware Vendors (Cisco, Juniper, Arista)
  • ISP Account Managers
  • Cloud Service Provider Technical Contacts (AWS, Azure, GCP)
  • Strategic Technology Partners

9What you need before you start

Not a wish list. The things you would be expected to already have.

  • A minimum of 8 years of hands-on experience in network engineering, with a significant focus on optimisation, performance tuning, and complex troubleshooting.
  • Proven experience leading network projects from design to deployment, including managing timelines and resources.
  • Demonstrable experience mentoring junior engineers and contributing to team development.
  • Deep understanding of at least two major network vendor platforms (e.g., Cisco, Juniper, Arista) and their respective operating systems.
  • Expert-level proficiency in dynamic routing protocols (BGP, OSPF) and their advanced optimisation techniques.
  • Strong scripting and automation skills, ideally with Python for network automation (Netmiko, NAPALM).
  • Extensive experience with network monitoring and diagnostic tools at an expert level (e.g., Datadog, Wireshark, Splunk).

10What to practise next

Where the job is going, and what to do about it starting this week.

Advanced Cloud Network Architecture & FinOps

Our cloud footprint is growing, and simply 'lifting and shifting' isn't cutting it anymore. We need to architect cloud networks for optimal performance, security, and cost-efficiency, understanding the nuances of each cloud provider's offerings. FinOps for cloud networking is becoming critical to avoid bill shock.

Multi-Cloud Connectivity Patterns · Cloud Network Security Posture Management · Cloud Network Cost Optimisation · Serverless & Container Networking

  • This month: Get certified in advanced networking for at least one major cloud provider (e.g., AWS Advanced Networking Specialty).
  • Month 2: Conduct a cost analysis of our current cloud network spend, identifying areas for optimisation.
  • Month 3: Design a multi-cloud connectivity solution for a hypothetical new application.
  • Month 4: Lead a workshop on cloud network FinOps best practices for the team.

Quick win: Review our current cloud network architecture for any obvious inefficiencies or over-provisioned resources today.

Programmable Networks (Intent-Based Networking)

The future of networking isn't just automation; it's about defining desired network behaviour (intent) and letting the network configure itself to achieve that. This requires understanding new controllers, APIs, and data models. It's a huge shift from command-line configuration.

Network Controllers (e.g., Cisco DNA Center, Juniper Contrail) · YANG Data Models & NETCONF/RESTCONF · Network Service Orchestration · Closed-Loop Automation

  • This month: Research a leading Intent-Based Networking (IBN) platform and its capabilities.
  • Month 2: Experiment with NETCONF/RESTCONF APIs on a virtual network device in your lab.
  • Month 3: Create a simple script to retrieve and modify network configuration using a YANG model.
  • Month 4: Develop a small proof-of-concept for an IBN use case relevant to our environment.

Quick win: Start familiarising yourself with the APIs of our existing network devices. Even small automation scripts are a step towards programmable networks.

11Staying current once you are in

What people here do to keep up
  • Regularly contributing to open-source network automation projects or sharing your scripts on platforms like GitHub.
  • Attending industry conferences (e.g., Cisco Live, Juniper NXTWORK, AWS re:Invent) to stay abreast of emerging technologies and best practices.
  • Participating in online forums or communities dedicated to network optimisation, automation, or cloud networking.
  • Subscribing to relevant technical journals, blogs, and newsletters to keep your knowledge current.
  • Presenting on technical topics internally or at local meetups, sharing your expertise and building your personal brand.

12The rising capability

The rising capability

Zavmo analysis

What's rising in its place

This is where the work is heading, and the higher pay with it. Get fluent here and the shift stops being a threat and starts being your edge.

Network Observability Engineering

Traditional monitoring is no longer enough. We need to move beyond just 'is it up?' to 'why is it slow?' and 'what's the user experience like?'. This means integrating metrics, logs, and traces from every part of the network and correlating them with application performance data. Our competitors are already using this to reduce MTTR and proactively identify issues.

  • Distributed Tracing (e.g., OpenTelemetry)
  • eBPF for Network Visibility
  • Service Mesh Networking (e.g., Istio, Linkerd)
  • AIOps for Predictive Analytics

Network-as-Code & CI/CD for Network Changes

Manual network changes are slow, error-prone, and don't scale. The industry is rapidly moving towards treating network infrastructure like software, using version control, automated testing, and continuous deployment pipelines. If we don't adopt this, we'll be left behind in terms of agility and reliability.

  • Git for Network Configuration Management
  • Automated Network Testing (e.g., Batfish, pyATS)
  • CI/CD Pipelines for Network Changes
  • Network State Validation

13What you’ll use

What you’ll use

Skills this role draws on

Technical

  • QoS Policy Design & Tuning
  • Dynamic Routing Protocol Optimisation (BGP/OSPF)
  • SD-WAN Architecture & Policy Management
  • Network Capacity Planning & Forecasting
  • TCP/IP Stack Analysis
  • Cloud Networking (AWS/Azure/GCP)

14The pathway

The pathway

How you actually get there, here

How you become one varies far more by country than what one does. This is the UK route. Most people take one of these ways in; the right one depends on where you're starting from.

  1. 1

    Senior Network Optimisation Specialist

    3-5 years as a Senior Specialist

    Skills to master

    • Mastering end-to-end project ownership for significant workstreams, demonstrating strong technical problem-solving for complex, non-routine issues, and showing early signs of mentorship or technical leadership.

    You're ready to move on when

    • Consistently delivering complex optimisation projects on time and with high quality.
    • Being the 'go-to' person for deep-dive troubleshooting in your area of expertise.
    • Proactively identifying and proposing solutions to architectural weaknesses.
    • Successfully mentoring junior team members and helping them grow their skills.
  2. 2

    Network Architect (Junior/Mid-Level)

    2-4 years as a Network Architect

    Skills to master

    • Developing strong architectural design principles, understanding business requirements and translating them into technical solutions, and gaining experience with enterprise-scale network deployments.

    You're ready to move on when

    • Successfully designing and documenting network solutions for new business initiatives.
    • Effectively communicating architectural decisions to technical and non-technical audiences.
    • Demonstrating a holistic understanding of network infrastructure beyond specific devices.
    • Proactively engaging with application teams to understand their networking needs.
  3. 3

    Highly Experienced Network Operations Engineer

    5-7 years in a senior operations role

    Skills to master

    • Deep expertise in network troubleshooting and incident response, strong understanding of operational tooling and processes, and a desire to move into proactive design and optimisation.

    You're ready to move on when

    • Exceptional track record in resolving complex network outages and performance issues.
    • Proposing and implementing operational improvements that reduce MTTR or prevent incidents.
    • Showing a clear interest in moving from reactive problem-solving to proactive design and architecture.
    • Developing automation skills to streamline operational tasks.

15Where this role leads

The long view: This role can lead to network architecture leadership, senior infrastructure roles, or a distinguished engineer path focused purely on technical problem solving.

The ten Future Fluencies

Zavmo analysis

The credential is what you can do today. These are what keep you valuable.

A qualification proves you can do the job as it's defined today. These ten are what decide whether you're still the obvious person for it in five years. They're the capabilities employers are now writing into senior roles faster than people are learning them. Zavmo weaves them through whatever you study, so you come out with both: the credential and the fluency.

The highlighted ones are the Fluencies your role leans on hardest, from how Lead Network Engineer (Optimisation) is actually changing.

Where it leads

Roles this leads to

Also named as a next step, with no page in the catalogue yet:

  • Engineering Manager (Network Optimisation)

How you would learn this

One to one, on the work you already do

A tutor sets the task against your own job and marks the reasoning, at your pace. There is no cohort to fall behind.

A lesson from Network Design and Administration, worked against Lead Network Engineer (Optimisation).

Network Design and Administration Level 5

Applied to your work in Lead Network Engineer (Optimisation)

This unit aims to provide learners with a comprehensive understanding of network design principles and administration practices. Upon completion, learners will be able to configure LANs and VLANs, and administer networks effectively, including user management, security protocols, and resource allocation.

How the thinking builds
  1. 1 Remember
  2. 2 Understand
  3. 3 Apply
  4. 4 Analyse
  5. 5 Evaluate
  6. 6 Create
An illustration of a Zavmo lesson, built from this role’s own route. The unit, its objective and every criterion above are the awarding body’s own words, not an example.

It is £70 a month, billed monthly. Your free first module is Future Fluency, and you can cancel any time.

Start my Lead Network Engineer (Optimisation) plan, free
See Your Progress Grow Illustration
Lead Network Engineer (Optimisation)
  • QoS Policy Design & Tuning
  • Dynamic Routing Protocol Optimisation (BGP/OSPF)
  • SD-WAN Architecture & Policy Management
  • Network Capacity Planning & Forecasting
  • TCP/IP Stack Analysis
  • Cloud Networking (AWS/Azure/GCP)
This is your Mind Palace on learn.zavmo.ai. Every skill above comes from this role's own record, not an example borrowed from another job. A node lights up when you evidence it, and what you build stays yours between jobs. That is the part a course cannot do.

16The detail, folded away

Everything else the record holds

The career branches in full, how AI is already showing up in the day-to-day, and the questions people ask about this job. Here when you want them, out of the way while you decide.

Where it leads next, rung by rung

Where it leads

The career path, and where it branches

Lead Network Engineer (Optimisation) is a start, not a ceiling. Each step below asks for new skills and hands back more autonomy.

  1. Principal Network Architect

    3-5 years in the Lead Network Engineer role

    L5

    • Digital Twin & Modeling Strategy Championing the use of network digital twins for strategic planning and forecasting.
    • Enterprise Packet Capture Strategy Defining and managing the strategy for long-term capture storage and analysis for security and performance forensics.
    • Automation Architecture Designing the entire network automation framework (CI/CD for network changes) across the organisation.
    • Data Governance & Strategy Architecting the log aggregation and retention strategy for the entire enterprise, ensuring compliance and integration with SIEM systems.

  2. Engineering Manager (Network Optimisation)

    2-4 years in the Lead Network Engineer role

    L5

    • Team Process Optimisation Designing and implementing efficient workflows for the network optimisation team.
    • Resource Planning Allocating team members to projects based on skills, priorities, and development goals.
    • Vendor Relationship Management (Operational) Managing day-to-day relationships with key service providers and ensuring SLAs are met.
    • Risk Management (Team Level) Identifying and mitigating risks related to team capacity, skill gaps, and project delivery.
Working with AI on the job

Working with AI

Where AI is starting to help

Imagine having a super-smart assistant who could handle the grunt work, leaving you free to focus on the really challenging, strategic network problems. That's what AI can do for a Lead Network Engineer (Optimisation) like you.

We're not talking about replacing your role; we're talking about making you incredibly more effective. AI tools are already transforming how we monitor, troubleshoot, and even design networks, giving you back precious hours every week. Here's how you could be using them:

Proactive Anomaly Detection

Forget sifting through endless logs and dashboards. Use AI/ML platforms (like Datadog AI or a custom ELK model) to automatically learn baseline network traffic patterns. The AI will flag statistically significant deviations – unusual traffic flows, sudden latency spikes – before they turn into major outages. This shifts you from reactive firefighting to proactive problem-solving, letting you fix issues before anyone even notices.

Root Cause Analysis Accelerator

When an incident does hit, feed logs from firewalls, routers, servers, and applications into an AI-powered correlation engine. This AI can instantly identify the most likely sequence of events across disparate systems that led to the failure. Instead of spending hours manually comparing logs, the AI points directly to the root cause, dramatically shortening your Mean Time To Resolution (MTTR) for complex, multi-system failures.

RFC & Vendor Doc Summariser

Faced with a complex configuration for a niche protocol or a 500-page vendor guide? Use a private AI assistant (like a local LLM or a secure cloud service) to summarise dense RFC documents or manuals. Ask specific questions like, 'Summarise the key differences in BGP community handling between Cisco IOS-XR and Juniper Junos,' and get immediate, actionable answers, saving you hours of tedious research.

Stakeholder Comms Generator

After a complex incident or a major optimisation project, use an AI tool to draft clear, concise post-mortems or executive summaries. Provide it with the technical timeline and key findings, and ask it to generate a business-friendly explanation of the impact, root cause, and remediation steps. This saves you significant time on administrative writing and ensures consistent, high-quality communication to non-technical stakeholders.

Common questions

Common questions

How do you become a Lead Network Engineer (Optimisation)?

Common routes in include Senior Network Optimisation Specialist (3-5 years as a Senior Specialist), Network Architect (Junior/Mid-Level) (2-4 years as a Network Architect) and Highly Experienced Network Operations Engineer (5-7 years in a senior operations role). Times vary with prior experience.

Where can a Lead Network Engineer (Optimisation) progress to?

This role can lead on to Principal Network Architect (3-5 years in the Lead Network Engineer role) and Engineering Manager (Network Optimisation) (2-4 years in the Lead Network Engineer role), depending on the skills you build.

What new skills matter most for a Lead Network Engineer (Optimisation)?

Increasingly, Network Observability Engineering and Network-as-Code & CI/CD for Network Changes. These are the skills our record of this role lists as growing.

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17Where to go from here

Other roles at Level 5

Same depth of qualification, different job. Useful if the work appeals but this particular role does not.

 More jobs in technology and data

Stay in the field you know and move sideways rather than up.
If you leave this industry

The skills involved apply beyond one employer. They can lead to cloud provider roles or network consultancy for large organisations. Others move into network security architecture, data centre design or application performance engineering. This builds on a strong grasp of how applications and networks interact.

This role profile is © 2026 Growth Engineering Technologies Ltd. Built from UK occupational standards and regulated qualification data, and written for Zavmo.

You're not behind. You're right on time. The shift is only just beginning. Your role won't look the same in two years. Be the one who leads the change, not the one it happens to. Start my Lead Network Engineer (Optimisation) plan, free What happens next: a free account, then we build your plan as you set up. No card. Build your plan, see your roadmap and meet the twelve tutors matched to you. All free. When you're ready to start learning, it's £70 a month, billed monthly. Cancel any time and billing stops.