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Cyber security,
blue team first.

I'm Marcus, a UK-based cyber security professional working in blue team operations, threat analysis and security behaviour. Nine years building production systems came first.

Disciplines
  • Blue Team Ops
  • Threat Analysis
  • Security Behaviour
  • Network Security
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Marcus Cyber Security Professional
UK
Focus
Blue team ops / Threat analysis / Security behaviour
Stack
PythonLua JavaMongoDB
Based
United Kingdom
Contact
marcusukdev@gmail.com
5Security domains
1000+Accounts secured
2022Securing since
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Three disciplines, one mindset

Security, code and community are not separate careers for me. Each one taught me how the next one fails.

Cyber Security

My primary focus. Network security, threat analysis, security behaviour and digital forensics. Learning the defensive side properly while working towards certification.

Blue Teaming Threat Analysis Forensics
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Software Development

Freelance development across Python, Lua, Java and the web stack. Shipped systems that ran live, under load, for communities of thousands, where bugs are visible immediately.

Python Lua Java MongoDB
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Community & Infrastructure

Founded and ran multiple online communities with thousands of members. Staffing, moderation policy, escalation paths and the server infrastructure underneath all of it.

Community Network Mgmt Infrastructure
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What I actually work with

An honest inventory. The tools and areas I use regularly, plus the ones I'm still building depth in.

Security

Where my focus sits day to day

  • Blue team operationsMonitoring, triage, response
  • Threat analysisIndicators, patterns, attribution
  • Security behaviourThe human attack surface
  • Network securitySegmentation, hardening
  • Access controlRoles, permissions, audit trails
  • Digital forensicsBuilding depth

Development

  • PythonTooling, automation
  • LuaFiveM, RedM, Roblox
  • JavaApplications, plugins
  • JavaScriptThis site, the tools suite
  • MongoDBSchema design, queries

Infrastructure

  • Linux administrationDeployment, upkeep
  • Server networksMulti-server, live traffic
  • Database operationsBackups, integrity, recovery
  • MonitoringAlerting, incident handling

Practice

  • Incident communicationClear reporting under pressure
  • Team leadershipLead developer, dev coordination
  • DocumentationRunbooks, handover notes
  • Policy and moderationWritten, enforced, iterated
  • CertificationIn progress

Systems that ran in public

Everything below carried real users, real load and real consequences when it broke.

Full portfolio
01
Western Border RP 2025 · Owner & Developer

Founded and built a RedM border roleplay server end to end. Fully custom scripts, bespoke game mechanics plus the infrastructure and access control behind them.

Lua RedM Infrastructure
02
San Andreas Roleplay 2022 · Lead Developer

Lead developer on a FiveM community running VMenu and QBCore. Owned the script architecture, coordinated the development team and handled the release process.

Lua QBCore Team Lead
03
MultiRust Network 2021 · Co-founder

Co-founded a Rust server network that grew to three servers. Each reached 200-300 concurrent players within fourteen days of launch, roughly 600 at peak across the network.

Network Ops Scaling Access Control
04
mcadev tools Ongoing · Solo

A small suite of free browser-based utilities: hashing, timesheets, shift planning and embed building. Everything runs client-side, so nothing you enter leaves your machine.

JavaScript Client-side only Free

How it all started

I got into computers and programming in 2017 and haven't stopped since. What began as curiosity about how game servers worked turned into nine years of building, breaking and running systems in public - and eventually into cyber security.

Running communities taught me that most incidents are not clever exploits. They're a leaked token, an over-permissioned account, or somebody trusting a message they shouldn't have. That's why security behaviour and blue team work interest me more than the offensive side.

I'm based in the United Kingdom, currently building depth in cyber security and working towards formal certification, while continuing development and management projects alongside it.

Security Profile Get In Touch
2017
First community - Arma 3
Launched my first game server and community, learning network and community management the hard way.
2019
Lua development
Began scripting in Lua - first on Roblox, then into FiveM where the production work started.
2021
MultiRust - 600+ concurrent players
Co-founded a Rust server network that grew to three servers, each hitting 200-300 players within 14 days.
2021
Joined the MidwestRP dev team
Brought on as a developer for MidwestRP, at the time one of the largest FiveM roleplay communities.
2022
San Andreas Roleplay - Lead Developer
Lead developer on a FiveM community running VMenu and QBCore, overseeing scripts, systems and the dev team.
2025
Western Border RP - Owner & Developer
Founded and built a RedM border roleplay server with fully custom scripts and game mechanics.
Present
Cyber security focus
Actively developing blue team and threat analysis skills and pursuing certification, while continuing freelance work.

Utilities that run entirely in your browser

Hashing, timesheets, shift planning and embed building, all client-side. Nothing you type is uploaded, logged or stored anywhere. No account, no tracking on the tool pages, no cost.

Hash Tools Timesheet Shift Planner Embed Builder
Open tools.mcadev.co.uk

Let's talk

I'm open to cyber security roles and still take on development and community projects. If any of this is useful to you, get in touch.

Send Me a Message See My Portfolio