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<title>Havox — John Gatward</title>
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<!-- ─── Nav ─────────────────────────────────────────────────── -->
<nav>
<a href="#hero" class="nav-logo">havox</a>
<ul class="nav-links">
<li><a href="#about">about</a></li>
<li><a href="#skills">skills</a></li>
<li><a href="#tutorials">tutorials</a></li>
<li><a href="#projects">projects</a></li>
<li><a href="#contact">contact</a></li>
</ul>
</nav>
<!-- ─── Hero ─────────────────────────────────────────────────── -->
<section id="hero">
<p class="hero-eyebrow">// havox.org — v4</p>
<h1 class="hero-name">John <em>Gatward</em></h1>
<p class="hero-subtitle">Software Developer</p>
<p class="hero-desc">
<span class="hero-by-line"><span class="hero-by">Backend engineer</span><span class="hero-by-role">by
trade</span></span>
<span class="hero-by-line"><span class="hero-by">Full-stack developer</span><span class="hero-by-role">by
curiosity</span></span>
<span class="hero-by-line"><span class="hero-by">Unofficial family cloud engineer</span><span
class="hero-by-role">by necessity</span></span>
<span class="hero-by-footer">I like building useful things and understanding how they work.</span>
</p>
<div class="hero-links">
<a href="#projects" class="btn btn-primary">see my work</a>
<a href="https://github.com/jayo60013" class="btn btn-ghost" target="_blank" rel="noopener">
<svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor">
<path
d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0 0 24 12c0-6.63-5.37-12-12-12z" />
</svg>
GitHub
</a>
<a href="https://www.linkedin.com/in/jaygatward" class="btn btn-ghost" target="_blank" rel="noopener">
<svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor">
<path
d="M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433a2.062 2.062 0 0 1-2.063-2.065 2.064 2.064 0 1 1 2.063 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0h.003z" />
</svg>
LinkedIn
</a>
</div>
</section>
<div class="divider"></div>
<!-- ─── About ─────────────────────────────────────────────────── -->
<section id="about" class="about-section">
<div class="reveal">
<p class="section-label">about</p>
<h2 class="section-heading">Havox & <em>me</em></h2>
</div>
<div class="about-columns">
<!-- Bio blocks -->
<div class="about-grid reveal" style="transition-delay:0.05s">
<div class="about-block">
<span class="about-block-tag tag tag-blue">day job</span>
<p>Backend engineer at <strong>Sainsbury's</strong> Supply Chain &amp; Logistics. Microservices,
Spring Boot, Kafka, MongoDB, AWS. It's good fun.</p>
</div>
<div class="about-block">
<span class="about-block-tag tag tag-teal">linux</span>
<p>Long-time Linux user and recovering distro-hopper. Currently: Hyprland on Void. Home server
running 24/7 for friends and family who didn't ask for it but appreciate it.</p>
</div>
<div class="about-block">
<span class="about-block-tag tag tag-yellow">teaching</span>
<p>Tutored CS, maths and English through school and uni. Still think the best way to understand
something is to explain it — which is why this site has tutorials.</p>
</div>
<div class="about-block">
<span class="about-block-tag tag tag-mauve">havox</span>
<p>Started in 2017 as a place to dump whatever I found interesting. Four redesigns and several dead
domains later, it's still going. Less a portfolio, more a paper trail.</p>
</div>
</div>
<!-- Version timeline -->
<div class="reveal" style="transition-delay:0.15s">
<p class="section-label">version history</p>
<div class="version-timeline">
<div class="version-item">
<div class="v-dot v-dot--current"></div>
<div class="v-content">
<div class="v-title">Havox V4 <span class="v-current-badge">current</span></div>
<div class="v-year">2025 → present</div>
<div class="v-desc">Catppuccin Mocha. Single page. Trying to get a new job this time.</div>
</div>
</div>
<a class="version-item version-item--link" href="archive/v3/index.html">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Havox V3 <span class="v-link-arrow"></span></div>
<div class="v-year">2023 → 2025</div>
<div class="v-desc">Borrowed a template. Wasn't very 'me'.</div>
</div>
</a>
<a class="version-item version-item--link" href="archive/v2/index.html">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Umbra.cyou <span class="v-link-arrow"></span></div>
<div class="v-year">2019 → 2022</div>
<div class="v-desc">Complete redesign using SCSS & Nord theme.</div>
</div>
</a>
<a class="version-item version-item--link" href="archive/v1/index.html">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Havox.org <span class="v-link-arrow"></span></div>
<div class="v-year">2017 → 2019</div>
<div class="v-desc">Entire site in one PHP file 🤣. Had a daily <s>trump</s>
quote-of-the-day achieved via webscraping a site daily.</div>
</div>
</a>
</div>
</div>
</div>
</section>
<div class="divider"></div>
<!-- ─── Skills ─────────────────────────────────────────────────── -->
<section id="skills">
<p class="section-label reveal">skills</p>
<h2 class="section-heading reveal" style="transition-delay:0.05s">What I <em>know</em></h2>
<div class="skills-grid">
<div class="skill-card reveal">
<span class="skill-card-icon"></span>
<h3>Backend</h3>
<p>Professional Java experience building microservices &amp; RESTful APIs with Spring Boot. TDD with
JUnit & Mockito.</p>
<div class="tag-row">
<span class="tag tag-blue">Java</span>
<span class="tag tag-green">Spring Boot</span>
<span class="tag tag-teal">AWS</span>
<span class="tag tag-peach">Kafka</span>
<span class="tag tag-sky">MongoDB</span>
</div>
</div>
<div class="skill-card reveal" style="transition-delay:0.08s">
<span class="skill-card-icon">🎨</span>
<h3>Frontend & Creative</h3>
<p>Comfortable with react and CSS. I enjoy visualising algorithms interactively — it's more fun than
a
console output.</p>
<div class="tag-row">
<span class="tag tag-yellow">React.js</span>
<span class="tag tag-peach">TypeScript</span>
<span class="tag tag-blue">HTML/CSS</span>
</div>
</div>
<div class="skill-card reveal" style="transition-delay:0.16s">
<span class="skill-card-icon">🖥</span>
<h3>Systems & Infra</h3>
<p>Long-term Linux user. Self-hosted web & media servers. Comfortable with networking, security
practices, and the command line.</p>
<div class="tag-row">
<span class="tag tag-green">Linux</span>
<span class="tag tag-teal">Docker</span>
<span class="tag tag-blue">Self-Hosting</span>
<span class="tag tag-peach">Wireguard</span>
</div>
</div>
<div class="skill-card skill-card--wide reveal" style="transition-delay:0.24s">
<span class="skill-card-icon">🎓</span>
<h3>Academic Breadth</h3>
<p>C, C++, x86_64 assembly, Haskell, R &amp; MatLab from uni. Modules in Advanced networking,
algorithms, compilers,
graphics, cryptography, malware analysis & many more.</p>
<div class="tag-row">
<span class="tag tag-blue">C / C++</span>
<span class="tag tag-mauve">Haskell</span>
<span class="tag tag-yellow">Algorithms</span>
<span class="tag tag-teal">Security</span>
<span class="tag tag-peach">Low Level OS</span>
</div>
</div>
</div>
</section>
<div class="divider"></div>
<!-- ─── Projects ──────────────────────────────────────────────── -->
<section id="projects">
<p class="section-label reveal">projects</p>
<h2 class="section-heading reveal" style="transition-delay:0.05s">Things I <em>built</em></h2>
<p class="section-intro reveal" style="transition-delay:0.1s">
Recent projects & things I found interesting. I have gone to painstaking lengths to not edit my older
projects... we all start somewhere.
</p>
<div class="card-grid reveal" style="transition-delay:0.15s">
<a class="card" href="projects/cubic_bezier_curve/index.html">
<span class="card-date">1 Oct 2021</span>
<span class="card-title">Drawing Bézier curves</span>
<span class="card-desc">Interactive animated diagram for quadratic and cubic Bézier curves. Click to
place points.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/marching_squares.html">
<span class="card-date">23 Sep 2021</span>
<span class="card-title">2D Marching squares</span>
<span class="card-desc">Marching squares in action — click a tile to edit the terrain.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/warping_lines.html">
<span class="card-date">2 Apr 2020</span>
<span class="card-title">Müller-Lyer illusion</span>
<span class="card-desc">A visualisation of the Müller-Lyer optical illusion rendered in JS.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/fourier_series.html">
<span class="card-date">27 Feb 2019</span>
<span class="card-title">Fourier series</span>
<span class="card-desc">Building a square wave from nothing but sine waves. Mesmerising.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/ellipse_construction.html">
<span class="card-date">23 Feb 2019</span>
<span class="card-title">Constructing an ellipse</span>
<span class="card-desc">How an ellipse can be constructed with a circle and radial lines — inspired by
3Blue1Brown.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/game_of_life.html">
<span class="card-date">2 May 2018</span>
<span class="card-title">Game of Life</span>
<span class="card-desc">A JS implementation of Conway's classic. Still fascinating.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/pi_approximation.html">
<span class="card-date">14 Mar 2018</span>
<span class="card-title">Calculating PI</span>
<span class="card-desc">Monte Carlo method — ratio of randomly placed dots in a square vs circle.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/oscillations_in_3d.html">
<span class="card-date">17 Dec 2017</span>
<span class="card-title">Oscillations in 3D</span>
<span class="card-desc">JS implementation of a Bees and Bombs gif.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/maze_generator/index.html">
<span class="card-date">13 Nov 2017</span>
<span class="card-title">Maze generator</span>
<span class="card-desc">A maze generator in p5.js. Using DFS & recursive backtracking.</span>
<span class="card-arrow"></span>
</a>
</div>
</section>
<div class="divider"></div>
<!-- ─── Tutorials ─────────────────────────────────────────────── -->
<section id="tutorials">
<p class="section-label reveal">tutorials</p>
<h2 class="section-heading reveal" style="transition-delay:0.05s">Things I <em>wrote down</em></h2>
<p class="section-intro reveal" style="transition-delay:0.1s">
Best way to learn is to teach. When I find something interesting I write a short tutorial — mainly to
consolidate my own understanding, but if it helps someone else that's a win.
</p>
<p class="section-intro reveal" style="transition-delay:0.1s">
Had to really try my best to not touch anything here. Every tutorial here is exacty how it was when I wrote
it in sixth form.
</p>
<div class="card-grid reveal" style="transition-delay:0.15s">
<a class="card" href="tutorials/summed_area/index.html">
<span class="card-date">3 Jan 2021</span>
<span class="card-title">Summed-area tables</span>
<span class="card-desc">Counting cells in a summed-area table, investigating how they work and why
they're efficient.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="tutorials/midpoint_displacement/index.html">
<span class="card-date">3 Feb 2019</span>
<span class="card-title">Midpoint displacement terrain generation</span>
<span class="card-desc">Generating random, natural-looking 2D terrains using the midpoint displacement
algorithm.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="tutorials/convex_hull/index.html">
<span class="card-date">22 Sept 2018</span>
<span class="card-title">Convex hull generator</span>
<span class="card-desc">Wrapping algorithms — visualising how to find the convex hull of a point
set.</span>
<span class="card-arrow"></span>
</a>
<a class="card" href="tutorials/tsp/index.html">
<span class="card-date">14 Feb 2018</span>
<span class="card-title">Travelling Salesperson Problem</span>
<span class="card-desc">Different implementations of the TSP problem — a classic.</span>
<span class="card-arrow"></span>
</a>
</div>
</section>
<div class="divider"></div>
<!-- ─── Contact ───────────────────────────────────────────────── -->
<section id="contact">
<p class="section-label reveal">contact</p>
<div class="contact-inner reveal" style="transition-delay:0.1s">
<div>
<h2>Let's <em>talk</em></h2>
<p>
I'm currently employed but open to the right opportunity — backend or full-stack, somewhere that
ships interesting things with people who care about their craft.
</p>
<p>
GitHub has the most complete picture of how I think. LinkedIn if you're formal. Either works.
</p>
</div>
<div class="contact-links">
<a href="https://github.com/jayo60013" class="contact-link" target="_blank" rel="noopener">
<span class="contact-link-icon">
<svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
<path
d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0 0 24 12c0-6.63-5.37-12-12-12z" />
</svg>
</span>
<span class="contact-link-label">GitHub</span>
<span class="contact-link-handle">jayo60013</span>
</a>
<a href="https://www.linkedin.com/in/jaygatward" class="contact-link" target="_blank" rel="noopener">
<span class="contact-link-icon">
<svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
<path
d="M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433a2.062 2.062 0 0 1-2.063-2.065 2.064 2.064 0 1 1 2.063 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0h.003z" />
</svg>
</span>
<span class="contact-link-label">LinkedIn</span>
<span class="contact-link-handle">jaygatward</span>
</a>
</div>
</div>
</section>
<!-- ─── Footer ─────────────────────────────────────────────────── -->
<footer>
<span>havox.org — John Gatward</span>
<span>
Built with too much coffee & <a href="https://catppuccin.com" target="_blank" rel="noopener">Catppuccin
Mocha</a>.
Shoutout to <a href="https://www.youtube.com/user/shiffman" target="_blank" rel="noopener">Daniel
Shiffman</a> & the <a href="https://p5js.org" target="_blank" rel="noopener">p5.js team</a>.
</span>
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