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<head>
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<title>Havox — John Gatward</title>
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<link rel="stylesheet" href="style.css" />
</head>
<body>
<!-- ─── 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 — v4</p>
<h1 class="hero-name">John <em>Gatward</em></h1>
<p class="hero-subtitle">Software Engineer</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 figuring 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>
<!-- Bio blocks -->
<div class="about-grid">
<div class="about-block reveal" style="transition-delay: 0.05s">
<span class="about-block-tag tag tag-blue">day job</span>
<p>
CS graduate from the University of Nottingham (2022), now working as
a backend engineer at <strong>Sainsbury's</strong> Supply Chain
&amp; Logistics — building microservices with Spring Boot on AWS,
designing REST APIs, connecting services with Kafka, and storing
data in MongoDB.
</p>
</div>
<div class="about-block reveal" style="transition-delay: 0.1s">
<span class="about-block-tag tag tag-green">home infra</span>
<p>
I run a home server that hosts media and projects for friends and
family. I enjoy building things that feel solid and useful — from
small games like
<em>Crack the Quote</em> to websites and services running on my own
hardware.
</p>
</div>
<div class="about-block reveal" style="transition-delay: 0.15s">
<span class="about-block-tag tag tag-teal">linux</span>
<p>
Long-time Linux user. Used to distro-hop obsessively and be deep in
the ricing community — these days it's Hyprland on Void Linux and a
growing collection of scripts that make the day job easier.
</p>
</div>
<div class="about-block reveal" style="transition-delay: 0.2s">
<span class="about-block-tag tag tag-yellow">teaching</span>
<p>
I tutored during school and university — CS, maths, English.
Teaching stuck with me. Explaining things clearly is a skill, and
it's why I also write tutorials here.
</p>
</div>
<div
class="about-block about-block--wide reveal"
style="transition-delay: 0.25s"
>
<span class="about-block-tag tag tag-mauve">havox</span>
<p>
Havox started as a place to document whatever I found cool —
tutorials, visualisations, experiments. It's been running in some
form since 2017, gone through four major redesigns, and outlasted
several domains. It represents my entire journey through technology,
and it's still going.
</p>
</div>
</div>
<!-- Version timeline -->
<div class="reveal" style="transition-delay: 0.3s">
<p class="section-label" style="margin-top: 3.5rem">version history</p>
<div class="version-timeline">
<div class="version-item">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Havox V4 — this one</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>
<div class="version-item">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Havox V3</div>
<div class="v-year">2023 → 2025</div>
<div class="v-desc">
Borrowed a template. Nord theme. Took SCSS seriously. Considered
mobile widths.
</div>
</div>
</div>
<div class="version-item">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Havox V2</div>
<div class="v-year">2019 → 2022</div>
<div class="v-desc">
First SCSS project. First site on own hardware — a Debian box
running nginx. Nord theme.
</div>
</div>
</div>
<div class="version-item">
<div class="v-dot"></div>
<div class="v-content">
<div class="v-title">Havox.org</div>
<div class="v-year">2017 → 2019</div>
<div class="v-desc">
Entire site in one PHP file 🤣. Had a Python quote-of-the-day
via cronjob though. <s>Counts.</s>
</div>
</div>
</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 RESTful APIs with Spring Boot.
Testing with JUnit & Mockito. Data persistence with MySQL, H2, JDBC.
</p>
<div class="tag-row">
<span class="tag tag-blue">Java</span>
<span class="tag tag-green">Spring Boot</span>
<span class="tag tag-peach">REST</span>
<span class="tag tag-teal">JUnit</span>
<span class="tag tag-sky">MySQL</span>
</div>
</div>
<div class="skill-card reveal" style="transition-delay: 0.08s">
<span class="skill-card-icon">🌐</span>
<h3>Frontend & Creative</h3>
<p>
JavaScript, p5.js, HTML/CSS/Scss. I enjoy visualising algorithms
interactively — it's more fun than a console output.
</p>
<div class="tag-row">
<span class="tag tag-yellow">JavaScript</span>
<span class="tag tag-peach">p5.js</span>
<span class="tag tag-mauve">Scss</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">nginx</span>
<span class="tag tag-sky">Networking</span>
<span class="tag tag-peach">Self-hosting</span>
</div>
</div>
<div class="skill-card reveal" style="transition-delay: 0.24s">
<span class="skill-card-icon">🎓</span>
<h3>Academic Breadth</h3>
<p>
C, C++, Haskell from uni. Coursework across Android dev, distributed
systems, graphics, cryptography, malware analysis.
</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>
</div>
</div>
</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>
<div class="card-grid reveal" style="transition-delay: 0.15s">
<a class="card" href="tutorials/summed_area/summed-area.html">
<span class="card-date">3 Jan 2021</span>
<span class="card-title">Summed-area tables</span>
<span class="card-desc"
>Integral images — what they are, how they work, and why they're
surprisingly useful for image processing.</span
>
<span class="card-arrow"></span>
</a>
<a class="card" href="terrainGen/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="TSP_files/index.php">
<span class="card-date">22 Sep 2018</span>
<span class="card-title">Travelling salesperson</span>
<span class="card-desc"
>Different implementations of the TSP problem — a classic that never
gets old.</span
>
<span class="card-arrow"></span>
</a>
<a class="card" href="jarvisMarsh/index.php">
<span class="card-date">14 Feb 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>
</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">
Mostly p5.js — visualising algorithms in ways that look more interesting
than they have any right to. Most use
<code
style="
background: var(--surface0);
color: var(--peach);
padding: 1px 5px;
border-radius: 3px;
font-size: 0.8em;
"
>mouseClicked()</code
>
so desktop only, sorry mobile.
</p>
<div class="card-grid reveal" style="transition-delay: 0.15s">
<a class="card" href="projects/drawing_curves/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/sorting_vis.html">
<span class="card-date">11 Apr 2020</span>
<span class="card-title">Bubble sort visualiser</span>
<span class="card-desc"
>Bars sorted by height, one frame per loop. Classic.</span
>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/warp_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_const.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/gameoflife.php">
<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/piApprox.php">
<span class="card-date">18 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/oscil.php">
<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. One of my oldest.</span
>
<span class="card-arrow"></span>
</a>
<a class="card" href="projects/mazeGen.php">
<span class="card-date">13 Nov 2017</span>
<span class="card-title">Maze generator</span>
<span class="card-desc"
>A maze generator in JS. The first project that made me think "oh, I
like this".</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>
</footer>
<script src="script.js"></script>
</body>
</html>