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Rebuild landing as personal site: AI engineering in production first, QRL second, numbers synced
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Entangled Code — David Coldeira</title>
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<meta name="description" content="Entangled Code — home of QRL, a relations-first quantum programming language built from first principles of information theory and relational physics." />
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<meta name="description" content="David Coldeira — full-stack Python engineer building production systems with LLMs in them: an agentic assistant over a live laboratory database, a Claude-powered route planner, a self-hosted fine-tuned model, a local-first coding agent. Also home of QRL, a relations-first quantum programming language." />
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<link rel="canonical" href="https://entangledcode.dev/"/>
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<meta property="og:type" content="website"/>
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<meta property="og:url" content="https://entangledcode.dev"/>
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<meta property="og:title" content="Entangled Code — QRL"/>
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<meta property="og:description" content="QRL is a relations-first quantum programming language. Entanglement as a first-class citizen. Causal structure as a type-level primitive."/>
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<meta property="og:title" content="Entangled Code — David Coldeira"/>
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<meta property="og:description" content="Production AI engineering with physics-grade rigour. LLM systems that run in production, and QRL, a relations-first quantum programming language."/>
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<meta property="og:image" content="https://entangledcode.dev/og-image.png"/>
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<meta name="twitter:card" content="summary_large_image"/>
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<meta name="twitter:title" content="Entangled Code — QRL"/>
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<meta name="twitter:description" content="QRL is a relations-first quantum programming language. Entanglement as a first-class citizen. Causal structure as a type-level primitive."/>
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<meta name="twitter:title" content="Entangled Code — David Coldeira"/>
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<meta name="twitter:description" content="Production AI engineering with physics-grade rigour. LLM systems that run in production, and QRL, a relations-first quantum programming language."/>
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<meta name="twitter:image" content="https://entangledcode.dev/og-image.png"/>
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}
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.hero h1 {
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font-size: clamp(2.2rem, 6vw, 3.8rem);
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font-size: clamp(2rem, 6vw, 3.4rem);
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font-weight: 800;
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border-radius: 4px;
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}
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/* ── Project cards ── */
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.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.5rem; }
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.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem 1.35rem; display: flex; flex-direction: column; gap: 0.5rem; }
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.card h3 { font-size: 1rem; font-weight: 700; letter-spacing: -0.01em; }
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.card h3 small { display: block; font-size: 0.72rem; font-weight: 600; color: var(--accent); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 0.3rem; }
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.card p { font-size: 0.9rem; color: var(--muted2); line-height: 1.6; flex: 1; margin: 0; }
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.card-links { font-size: 0.8rem; display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; }
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.card-links a { color: var(--muted2); border-bottom: 1px solid var(--border); }
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.card-links a:hover { color: var(--text); border-color: var(--muted); }
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.posts { list-style: none; margin-top: 1.25rem; }
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.posts li { padding: 0.85rem 0; border-top: 1px solid var(--border); }
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.posts a { font-weight: 600; }
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.posts span { display: block; font-size: 0.875rem; color: var(--muted2); margin-top: 0.2rem; }
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/* ── Footer ── */
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footer {
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.nav-links .hide-mobile { display: none; }
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.hero { padding: 4rem 1.5rem 3rem; }
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.section { padding: 3rem 1.5rem; }
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.cards { grid-template-columns: 1fr; }
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}
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</style>
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</head>
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entangled code
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</div>
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<div class="nav-links">
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<a href="https://github.com/entangledcode/qrl" class="hide-mobile">QRL on GitHub</a>
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<a href="#ai" class="hide-mobile">AI engineering</a>
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<a href="#qrl" class="hide-mobile">QRL</a>
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<a href="https://dcoldeira.github.io" class="hide-mobile">Blog</a>
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<a href="https://github.com/dcoldeira" class="hide-mobile">GitHub</a>
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<a href="mailto:david@entangledcode.dev" class="btn btn-outline">Contact</a>
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</div>
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</nav>
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<!-- Hero -->
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<section class="hero">
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<div class="hero-label">Quantum Relational Language</div>
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<h1>Relations first.<br><span>Entanglement built in.</span></h1>
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<div class="hero-label">David Coldeira · Bristol, UK</div>
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<h1>Production AI engineering.<br><span>Physics-grade rigour.</span></h1>
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<p>
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QRL is a quantum programming language built from first principles of information theory and relational physics.
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Describe correlations, derive predictions — causal structure as a type-level primitive.
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I am a full-stack Python engineer who builds and runs production systems end to end,
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and I put language models inside them only where their output can be verified.
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Ten years in software, a physics degree, and a quantum programming language on the side.
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</p>
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<div class="hero-actions">
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<a href="https://github.com/entangledcode/qrl" class="btn btn-primary">View on GitHub</a>
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<a href="https://doi.org/10.5281/zenodo.18292199" class="btn btn-outline">Zenodo preprint</a>
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<a href="#ai" class="btn btn-primary">What I have shipped</a>
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<a href="https://www.linkedin.com/in/dcoldeira" class="btn btn-outline">LinkedIn</a>
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<a href="mailto:david@entangledcode.dev" class="btn btn-outline">Email</a>
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</div>
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</section>
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<!-- AI engineering -->
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<section class="section" id="ai">
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<div class="section-label">AI engineering in production</div>
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<h2>Language models with a verifier around them</h2>
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<p>
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The pattern in everything below is the same: the model does the concentrated reasoning,
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deterministic code checks the result before it reaches a user or a database, and
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permissions are enforced by the system rather than by the prompt.
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</p>
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<div class="cards">
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<div class="card">
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<h3><small>Day job · Geoquip Marine</small>Gio, an assistant over a live laboratory database</h3>
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<p>
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Claude API tool-use inside GQMLab, the LIMS I built for a UKAS-accredited geotechnical laboratory.
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Natural-language SQL, charts and live report-schema introspection, on a read-only database user
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with query validation and role-gated access. In production for the lab's engineers.
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</p>
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<div class="card-links">
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<a href="https://dcoldeira.github.io/posts/2026-09-16-llm-production-database/">How the read-only layers work</a>
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<a href="https://gqmlab.geoquip-marine.com">GQMLab</a>
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</div>
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</div>
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<div class="card">
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<h3><small>Forza7 · SailGenius</small>Marco, a Claude-powered passage planner</h3>
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<p>
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Reasons over live weather, tide and boat-performance data to propose offshore routes.
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Every AI-generated waypoint is validated against real water and depth data before the
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sailor sees it. Part of a Flutter sailing suite with a FastAPI/PostgreSQL backend.
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</p>
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<div class="card-links">
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<a href="https://dcoldeira.github.io/posts/2026-09-16-llm-verified-execution/">Why the model does not do the physics</a>
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<a href="https://forza7.dev">forza7.dev</a>
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</div>
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</div>
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<div class="card">
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<h3><small>Independent · 2025</small>Bell, a self-hosted fine-tuned physics assistant</h3>
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<p>
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Qwen3-8B with a LoRA adapter trained on 815 instruction pairs, as a provider-swappable
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alternative to the Claude API. Sandboxed Python execution, Docker/Caddy deployment,
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GDPR-compliant. Ran live at bell.entangledcode.dev; now offline, code and training data kept.
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</p>
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<div class="card-links">
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<a href="mailto:david@entangledcode.dev?subject=Bell%20code">Code on request</a>
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</div>
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</div>
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<div class="card">
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<h3><small>Independent · 2026</small>Froe, a local-first coding agent in Go</h3>
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<p>
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A single static binary for the terminal and Neovim that runs on a 4 GB laptop with no source
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code leaving the machine. Measured before designed: the autonomous loop lost on a real
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multi-site edit, so it became small bounded commands with deterministic verification of
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the model's answer, taking <code>locate</code> from 0/3 to 3/3.
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</p>
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<div class="card-links">
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<a href="mailto:david@entangledcode.dev?subject=Froe%20code">Code on request</a>
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</div>
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</div>
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</div>
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</section>
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<!-- Writing -->
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<section class="section" id="writing">
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<div class="section-label">Writing</div>
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<h2>Notes from running these in production</h2>
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<ul class="posts">
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<li>
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<a href="https://dcoldeira.github.io/posts/2026-09-16-llm-production-database/">Putting an LLM on a Production Database, Read-Only by Construction</a>
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<span>Four independent layers, only one of which actually matters, and why the prompt is the layer you should trust least.</span>
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</li>
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<li>
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<a href="https://dcoldeira.github.io/posts/2026-09-16-llm-verified-execution/">Don't Let the Model Do the Physics</a>
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<span>Keep the model to reasoning and let deterministic code own every number that reaches a user.</span>
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</li>
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</ul>
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<div class="links-row">
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<a href="https://dcoldeira.github.io" class="btn btn-outline">All posts</a>
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</div>
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</section>
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<!-- QRL -->
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<section class="section">
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<div class="section-label">The Language</div>
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<section class="section" id="qrl">
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<div class="section-label">Research</div>
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<h2>QRL — Quantum Relational Language</h2>
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<p>
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A relations-first approach to quantum computing where entanglement is a first-class citizen, not a derived concept.
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A relations-first quantum programming language where entanglement is a first-class citizen, not a derived concept.
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The key formal contribution: <strong>causal structure as a type-level primitive</strong>.
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A program that type-checks as <code>Switch(d)</code> is provably causally nonseparable — a result no existing quantum programming language can state.
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A program that type-checks as <code>Switch(d)</code> is provably causally nonseparable, a result no existing quantum programming language can state.
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</p>
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<p>
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Implements five foundational papers: process matrices (Oreshkov 2012), causal nonseparability witnesses (Araújo 2015),
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quantum causal models (Allen 2017), loophole-free Bell tests (Hensen 2015), and categorical quantum mechanics (Coecke & Kissinger 2017).
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quantum causal models (Allen 2017), loophole-free Bell tests (Hensen 2015), and categorical quantum mechanics (Coecke &amp; Kissinger 2017).
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Full compiler pipeline from relations to MBQC measurement patterns, with four backends (Perceval, PennyLane, graphix, Qiskit).
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Hardware-verified on Quandela's qpu:belenos photonic QPU (S = 2.61 ± 0.08).
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</p>
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<div class="meta-row">
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<span>~13,600 lines</span>
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<span>896 tests passing</span>
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<span>24 modules</span>
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<span>Paper in preparation — QPL 2027</span>
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<span>31 modules</span>
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<span>Preprint on Zenodo</span>
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</div>
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<div class="links-row">
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<a href="https://github.com/entangledcode/qrl" class="btn btn-primary">GitHub</a>
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<a href="https://doi.org/10.5281/zenodo.18292199" class="btn btn-outline">Zenodo DOI</a>
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<a href="https://dcoldeira.github.io" class="btn btn-outline">Blog</a>
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<a href="https://github.com/dcoldeira/qrl-book" class="btn btn-outline">QRL Book</a>
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</div>
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</section>
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<footer>
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<p>
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<a href="https://github.com/dcoldeira">github.com/dcoldeira</a> &nbsp;·&nbsp;
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<a href="https://www.linkedin.com/in/dcoldeira">linkedin.com/in/dcoldeira</a> &nbsp;·&nbsp;
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<a href="https://github.com/entangledcode/qrl">entangledcode/qrl</a> &nbsp;·&nbsp;
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<a href="https://doi.org/10.5281/zenodo.18292199">Zenodo</a> &nbsp;·&nbsp;
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<a href="privacy.html">Privacy</a>

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