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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Guillermo Rodríguez Delgado — iOS Engineer & Mobile Architect</title>
<meta name="description" content="Guillermo Rodríguez Delgado — iOS Software Engineer and Mobile Architect with 14+ years building high-quality, secure mobile software. Digital identity, SwiftUI, game dev.">
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<meta property="og:title" content="Guillermo Rodríguez Delgado — iOS Engineer & Mobile Architect">
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</head>
<body>
<header class="nav">
<div class="container nav-inner">
<a class="nav-brand" href="/">GRD</a>
<nav class="nav-links">
<a href="#profile" data-n="01">Profile</a>
<a href="#path-a" data-n="02">Path</a>
<a href="#work-a" data-n="03">Work</a>
<a href="#toolkit" data-n="04">Toolkit</a>
<a href="#contact" data-n="05">Contact</a>
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<div class="nav-status">
<span class="status-dot">Available</span>
<span class="clock" id="clock">--:--:--</span>
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<main>
<section class="page page-intro" id="intro">
<div class="container">
<p class="intro-kicker reveal">iOS Engineer · Mobile Architect · Łódź, PL</p>
<h1 class="intro-name reveal">Guillermo<br>Rodríguez Delgado</h1>
<p class="intro-role reveal" aria-label="Building government-grade digital identity">
<span id="type"></span><span class="cursor" aria-hidden="true"> </span>
</p>
<div class="intro-cta reveal">
<a class="btn btn-primary" href="#contact">
<svg viewBox="0 0 24 24" aria-hidden="true"><path d="M20 4H4a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V6a2 2 0 0 0-2-2zm0 4.24-8 5-8-5V6l8 5 8-5v2.24z"/></svg>
Get in touch
</a>
<a class="btn" href="https://www.linkedin.com/in/guillermoRD" target="_blank" rel="noopener">LinkedIn</a>
<a class="btn" href="https://github.com/gelemias" target="_blank" rel="noopener">GitHub</a>
</div>
<div class="tally reveal">
<div class="tally-item"><span class="n" data-count="14">0</span><span class="suffix">+</span><span class="k">Years</span></div>
<div class="tally-item"><span class="n" data-count="20">0</span><span class="suffix">+</span><span class="k">Apps shipped</span></div>
<div class="tally-item"><span class="n" data-count="6">0</span><span class="k">Companies</span></div>
<div class="tally-item"><span class="n" data-count="5">0</span><span class="k">Open-source repos</span></div>
</div>
</div>
</section>
<section class="page" id="profile">
<div class="container">
<div class="page-head reveal">
<div class="page-tag"><span class="num">01</span><span class="bar"></span> Profile</div>
<h2 class="page-title">The short version</h2>
</div>
<div class="profile">
<aside class="profile-meta reveal">
<div class="row"><span class="k">Role</span><span class="v">Mobile Architect</span></div>
<div class="row"><span class="k">Base</span><span class="v">Łódź, Poland</span></div>
<div class="row"><span class="k">Team</span><span class="v">IDEMIA · iOS</span></div>
<div class="row"><span class="k">Focus</span><span class="v">Digital Identity</span></div>
<div class="row"><span class="k">Since</span><span class="v">2011</span></div>
<div class="row"><span class="k">Status</span><span class="v on">Available</span></div>
</aside>
<div class="profile-body reveal">
<p>I've spent <strong>14+ years</strong> building mobile software, and these days I
lead iOS at <strong>IDEMIA</strong>, designing the architecture behind
<span class="hl">government-grade digital identity</span> — wallets, verifiable
credentials and ISO 18013 mDoc flows, where security, performance and long-term
maintainability aren't features but the product itself.</p>
<p>After hours I keep the craft playful: a pixel-art virtual pet that teaches kids
math in SwiftUI, two Godot games — an isometric defense game and a remake of a
2015 title whose source was lost — an open-source leaderboard backend on
Cloudflare Workers meant to hold every one of their scoreboards, and tooling for
testing identity-wallet interoperability. Whatever the project, the through-line is
the same — a strong focus on <strong>UI and custom-built components</strong>, choosing
the right approach for each specific need rather than the fashionable one.</p>
<p>Away from the screen I run — long, early and quiet. The same patience for
pace, and for getting the small things right, goes into everything I build.</p>
</div>
</div>
</div>
</section>
<section class="page" id="path-a">
<div class="container">
<div class="page-head reveal">
<div class="page-tag"><span class="num">02</span><span class="bar"></span> Path</div>
<h2 class="page-title">Where I've built</h2>
<p class="page-sub">Fifteen years of building, from large-format printers to nation-scale digital identity.</p>
</div>
<div class="path">
<article class="role reveal">
<div class="role-num">01</div>
<div>
<h3 class="role-title">Mobile Architect, iOS</h3>
<p class="role-meta"><span class="co">IDEMIA</span> · Łódź, Poland <span class="dates">05/2023 — Present</span></p>
<p class="role-body">Designing technical architecture and owning the hard engineering problems for large-scale digital-identity platforms.</p>
<ul>
<li>Own architecture decisions on non-functional aspects: performance, high availability, resiliency and security.</li>
<li>Translate functional and business requirements into the right architecture and technologies.</li>
<li>Enforce architectural and technological consistency across every platform component.</li>
<li>Drive code-review processes to guarantee the best software quality.</li>
</ul>
</div>
</article>
<article class="role reveal">
<div class="role-num">02</div>
<div>
<h3 class="role-title">Senior Software Developer, iOS</h3>
<p class="role-meta"><span class="co">IDEMIA</span> · Łódź, Poland <span class="dates">05/2018 — 05/2023</span></p>
<p class="role-body">Delivered quality software within the timeframe committed by the team.</p>
<ul>
<li>Shipped features with Product Owners and Functional Analysts, backed by tests and thorough review.</li>
<li>Implemented and improved non-functional items: high availability, performance and platform monitoring.</li>
<li>Contributed to common libraries used across products while keeping technical debt low.</li>
</ul>
</div>
</article>
</div>
</div>
</section>
<section class="page" id="path-b">
<div class="container">
<div class="page-cont reveal">02 — Path, continued</div>
<div class="path">
<article class="role reveal">
<div class="role-num">03</div>
<div>
<h3 class="role-title">iOS Developer & Consultant</h3>
<p class="role-meta"><span class="co">Freelance</span> · Remote <span class="dates">2011 — 2018</span></p>
<p class="role-body">Worked with international organizations and individuals as a freelance iOS developer and consultant, with a track record of on-time, on-budget delivery.</p>
</div>
</article>
<article class="role reveal">
<div class="role-num">04</div>
<div>
<h3 class="role-title">Senior iOS Software Engineer</h3>
<p class="role-meta"><span class="co">Mobica</span> · Łódź, Poland <span class="dates">12/2014 — 04/2018</span></p>
<p class="role-body">Engineering and consultancy services spanning the breadth of software design, engineering and testing.</p>
</div>
</article>
<article class="role reveal">
<div class="role-num">05</div>
<div>
<h3 class="role-title">iOS Software Engineer</h3>
<p class="role-meta"><span class="co">Rule Financial</span> · Łódź, Poland <span class="dates">11/2013 — 11/2014</span></p>
<p class="role-body">Technical consulting and IT services for investment banks, asset and wealth management, and related financial institutions.</p>
</div>
</article>
<article class="role reveal">
<div class="role-num">06</div>
<div>
<h3 class="role-title">Software Engineer</h3>
<p class="role-meta"><span class="co">Hewlett-Packard</span> · León, Spain <span class="dates">04/2011 — 10/2013</span></p>
<p class="role-body">Built the Windows desktop application for large-format printers, focused on UI, using Windows Presentation Foundation.</p>
</div>
</article>
</div>
</div>
</section>
<section class="page" id="work-a">
<div class="container">
<div class="page-head reveal">
<div class="page-tag"><span class="num">03</span><span class="bar"></span> Work</div>
<h2 class="page-title">Selected work</h2>
<p class="page-sub">Products shipped, tools open-sourced, games built for the joy of it.</p>
</div>
<div class="filters reveal" role="tablist" aria-label="Filter projects">
<button class="filter active" data-filter="all">All</button>
<button class="filter" data-filter="ios">iOS</button>
<button class="filter" data-filter="identity">Digital Identity</button>
<button class="filter" data-filter="oss">Open Source</button>
<button class="filter" data-filter="games">Games</button>
</div>
<div class="work-grid">
<article class="card project reveal" data-cat="ios games">
<div class="card-media"><img src="/assets/img/sumo.webp" loading="lazy" decoding="async" style="object-position: center 68%;" alt="Sumo key art — a mystery pack bursting open to reveal the pixel-art mascot"></div>
<div class="card-body">
<div class="card-idx">01</div>
<h3><a href="https://apps.apple.com/app/sumo-math-virtual-pet/id6789571035" target="_blank" rel="noopener">Sumo<span class="ext">↗</span></a></h3>
<p>Virtual-pet learning game, live on the App Store. A child opens a mystery pack and cares for its mascot by completing short bursts of multiple-choice math, with invisibly adaptive difficulty. Local-only, no accounts, no ads — cheerful pixel-art for ages 4–12.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">SwiftUI</span><span class="tag">Education</span><span class="tag">Kids</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios games">
<div class="card-media"><img src="/assets/img/jumpyChewie-remake.webp" loading="lazy" decoding="async" style="object-position: center center;" alt="Jumpy Chewie key art — the orange gum blob clinging inside a monster's open mouth, ringed by teeth"></div>
<div class="card-body">
<div class="card-idx">02</div>
<h3>Jumpy Chewie (Remake)</h3>
<p>Godot 4 remake of my 2015 SpriteKit game, rebuilt from surviving marketing art after the original source was lost. You are a blob of gum clinging to the rim of a monster's mouth: gravity drags you down while teeth ride the rim trying to chew you. Portrait, one thumb, endless — score is jumps survived. No physics engine anywhere: the rim is a one-dimensional looping track traced from the artwork's alpha channel.</p>
<div class="tags"><span class="tag">Godot</span><span class="tag">Game Dev</span><span class="tag">iOS</span><span class="tag">Android</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios games">
<div class="card-media"><img src="/assets/img/turnSiege.webp" loading="lazy" decoding="async" style="object-position: center 62%;" alt="Turn Siege key art — an isometric gas station on a lit platform, surrounded on all four fronts by advancing zombies"></div>
<div class="card-body">
<div class="card-idx">03</div>
<h3>Turn Siege</h3>
<p>Fast-loading, bite-sized isometric defense game built with Godot 4, coming to iOS and Android. Your gas station sits on a four-front battlefield but you can only cover two fronts at once — swipe to spin the view and bring your guns to bear. Fully procedural graphics and daily streak rewards.</p>
<div class="tags"><span class="tag">Godot</span><span class="tag">Game Dev</span><span class="tag">iOS</span><span class="tag">Android</span></div>
</div>
</article>
<article class="card project reveal" data-cat="oss">
<div class="card-media ph ph-oss"><span class="ph-glyph"></></span><span class="ph-label">Open Source</span></div>
<div class="card-body">
<div class="card-idx">04</div>
<h3><a href="https://github.com/gelemias/leaderboard-platform" target="_blank" rel="noopener">Leaderboard Platform<span class="ext">↗</span></a></h3>
<p>Open-source leaderboard backend on Cloudflare Workers and D1 — one scoreboard for all my games. Runs start from a server-issued, one-shot session bound to a game, player and ruleset, and submissions carry an input trace that an optional per-ruleset simulator replays before a score is allowed to count. Daily, weekly and all-time boards, a public game catalogue and rate-limited read feeds.</p>
<div class="tags"><span class="tag">Open Source</span><span class="tag">TypeScript</span><span class="tag">Cloudflare Workers</span><span class="tag">Backend</span></div>
</div>
</article>
<article class="card project reveal" data-cat="oss identity">
<div class="card-media ph ph-oss"><span class="ph-glyph"></></span><span class="ph-label">Open Source</span></div>
<div class="card-body">
<div class="card-idx">05</div>
<h3><a href="https://github.com/gelemias/mdoc-verifier" target="_blank" rel="noopener">mdoc-verifier<span class="ext">↗</span></a></h3>
<p>Open-source FastAPI demo verifier for ISO 18013 web-retrieval flows — generates <code>mdoc://</code> QR deep links, derives session keys and exchanges encrypted CBOR DeviceRequests to test wallet interoperability for PhotoID-style requests.</p>
<div class="tags"><span class="tag">Open Source</span><span class="tag">Python</span><span class="tag">ISO 18013</span><span class="tag">Identity</span></div>
</div>
</article>
<article class="card project reveal" data-cat="oss">
<div class="card-media ph ph-oss"><span class="ph-glyph"></></span><span class="ph-label">Open Source</span></div>
<div class="card-body">
<div class="card-idx">06</div>
<h3><a href="https://github.com/gelemias/b64img" target="_blank" rel="noopener">b64img<span class="ext">↗</span></a></h3>
<p>Simple, no-frills base64 image decoder — paste an encoded string, get your image back.</p>
<div class="tags"><span class="tag">Open Source</span><span class="tag">Utility</span></div>
</div>
</article>
</div>
</div>
</section>
<section class="page" id="work-b">
<div class="container">
<div class="page-cont reveal">03 — Work, continued</div>
<div class="work-grid">
<article class="card project reveal" data-cat="ios identity">
<div class="card-media ph ph-id"><span class="ph-glyph">◈</span><span class="ph-label">Digital Identity</span></div>
<div class="card-body">
<div class="card-idx">07</div>
<h3><a href="https://apps.apple.com/pl/app/ips-id-wallet/id6758149983" target="_blank" rel="noopener">ID Wallet<span class="ext">↗</span></a></h3>
<p>Secure digital-identity wallet for managing verifiable credentials and identity documents — identity proofing through document scanning, NFC passport/ID verification and biometric authentication, with consent-driven attribute sharing.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Identity</span><span class="tag">NFC</span><span class="tag">Biometrics</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios identity">
<div class="card-media ph ph-id"><span class="ph-glyph">◈</span><span class="ph-label">Digital Identity</span></div>
<div class="card-body">
<div class="card-idx">08</div>
<h3><a href="https://www.idemia.com/mobile-id" target="_blank" rel="noopener">Mobile ID<span class="ext">↗</span></a></h3>
<p>A contactless, highly secure, government-approved personal credential living on the user's smartphone. Multi-modular components distributed as an SDK for integrators or as a theme-able application.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">SDK</span><span class="tag">Security</span></div>
</div>
</article>
<article class="card project reveal" data-cat="oss">
<div class="card-media"><img src="/assets/img/tGlider.webp" loading="lazy" decoding="async" alt="RDGliderViewController — draggable glider control demo"></div>
<div class="card-body">
<div class="card-idx">09</div>
<h3><a href="https://github.com/gelemias/RDGliderViewController" target="_blank" rel="noopener">RDGliderViewController<span class="ext">↗</span></a></h3>
<p>Open-source responsive control, written in both Swift and Objective-C, for a draggable view controller gliding over another view controller.</p>
<div class="tags"><span class="tag">Open Source</span><span class="tag">Swift</span><span class="tag">Objective-C</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios">
<div class="card-media"><img src="/assets/img/tTmo.webp" loading="lazy" decoding="async" alt="T-Mobile Tuesdays app screen"></div>
<div class="card-body">
<div class="card-idx">10</div>
<h3><a href="https://www.t-mobiletuesdays.com/" target="_blank" rel="noopener">T-Mobile Tuesdays<span class="ext">↗</span></a></h3>
<p>Highly acclaimed US app offering vouchers and discounts to users — reached the Top 50 in the App Store several times.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Consumer</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios">
<div class="card-media"><img src="/assets/img/tDrive.webp" loading="lazy" decoding="async" alt="TomTom MyDrive route-planning screen"></div>
<div class="card-body">
<div class="card-idx">11</div>
<h3><a href="https://www.tomtom.com/" target="_blank" rel="noopener">TomTom MyDrive<span class="ext">↗</span></a></h3>
<p>TomTom's client for the MyDrive service — plan a route from your device, then read it on your navigation device.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Navigation</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios games">
<div class="card-media"><img src="/assets/img/tJumpy.webp" loading="lazy" decoding="async" alt="Jumpy Chewie game screen"></div>
<div class="card-body">
<div class="card-idx">12</div>
<h3>Jumpy Chewie (2015)</h3>
<p>The original: a universal game for iOS built with SpriteKit, featuring Game Center connectivity, push notifications and in-app purchases. Its source was lost — hence the remake above.</p>
<div class="tags"><span class="tag">SpriteKit</span><span class="tag">Game Center</span></div>
</div>
</article>
</div>
</div>
</section>
<section class="page" id="work-c">
<div class="container">
<div class="page-cont reveal">03 — Work, continued</div>
<div class="work-grid">
<article class="card project reveal" data-cat="ios">
<div class="card-media"><img src="/assets/img/tUrban.webp" loading="lazy" decoding="async" alt="UrbanForms mural-map screen"></div>
<div class="card-body">
<div class="card-idx">13</div>
<h3>UrbanForms</h3>
<p>Companion app for the yearly urban-art festival in Łódź, Poland — navigate every mural painted in the city, get to know the art and stay up to date with the event.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Maps</span><span class="tag">Urban Art</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios">
<div class="card-media"><img src="/assets/img/tMiga.webp" loading="lazy" decoding="async" alt="MigawKarta transport app screen"></div>
<div class="card-body">
<div class="card-idx">14</div>
<h3>MigawKarta</h3>
<p>Tracking for all public transport in Łódź, including management of the local "Migawka" travel card — expiration alerts, news, timetable changes and payment history.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Transport</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios">
<div class="card-media"><img src="/assets/img/tUle.webp" loading="lazy" decoding="async" alt="iULE university app screen"></div>
<div class="card-body">
<div class="card-idx">15</div>
<h3>iULE</h3>
<p>App for the University of León integrating dashboards, lists and account screens so students and professors can better manage their lessons.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Education</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios">
<div class="card-media"><img src="/assets/img/tDb.webp" loading="lazy" decoding="async" alt="Deutsche Bank Summit iPad app welcome screen"></div>
<div class="card-body">
<div class="card-idx">16</div>
<h3>Deutsche Bank Summit</h3>
<p>iPad ad-hoc app helping executives manage their relationships with delegates and attendees at the Summit conference.</p>
<div class="tags"><span class="tag">iPad</span><span class="tag">Enterprise</span></div>
</div>
</article>
<article class="card project reveal" data-cat="">
<div class="card-media"><img src="/assets/img/tHp.webp" loading="lazy" decoding="async" alt="HP Designjet print-preview utility screen"></div>
<div class="card-body">
<div class="card-idx">17</div>
<h3>HP ePrint & Share</h3>
<p>HP ePrint service for printing documents via tablets, smartphones, laptops and printers, alongside desktop utilities for large-format HP printers.</p>
<div class="tags"><span class="tag">WPF</span><span class="tag">C#</span></div>
</div>
</article>
<article class="card project reveal" data-cat="ios">
<div class="card-media ph ph-oss"><span class="ph-glyph">⬡</span><span class="ph-label">Framework</span></div>
<div class="card-body">
<div class="card-idx">18</div>
<h3>Blizzability</h3>
<p>Framework for apps dynamically driven from a CMS — personalizing module loads and optimizing offline data handling.</p>
<div class="tags"><span class="tag">iOS</span><span class="tag">Framework</span></div>
</div>
</article>
</div>
</div>
</section>
<section class="page" id="toolkit">
<div class="container">
<div class="page-head reveal">
<div class="page-tag"><span class="num">04</span><span class="bar"></span> Toolkit</div>
<h2 class="page-title">What I work with</h2>
</div>
<div class="chip-group reveal">
<h3>Mobile & Languages</h3>
<div class="chips"><span class="chip">Swift</span><span class="chip">SwiftUI</span><span class="chip">Objective-C</span><span class="chip">Cocoa Touch</span><span class="chip">Python</span><span class="chip">C#</span><span class="chip">C++</span><span class="chip">TypeScript</span><span class="chip">JavaScript</span><span class="chip">GDScript</span></div>
</div>
<div class="chip-group reveal">
<h3>Backend & Platform</h3>
<div class="chips"><span class="chip">Cloudflare Workers</span><span class="chip">D1 / SQLite</span><span class="chip">REST APIs</span><span class="chip">FastAPI</span><span class="chip">Rate Limiting</span><span class="chip">Server-Side Validation</span></div>
</div>
<div class="chip-group reveal">
<h3>Digital Identity & Security</h3>
<div class="chips"><span class="chip">ISO/IEC 18013 (mDL / mDoc)</span><span class="chip">Verifiable Credentials</span><span class="chip">NFC Document Verification</span><span class="chip">Biometric Authentication</span><span class="chip">CBOR</span><span class="chip">Applied Cryptography</span><span class="chip">Secure Architecture</span></div>
</div>
<div class="chip-group reveal">
<h3>Engineering Practices</h3>
<div class="chips"><span class="chip">Software Architecture</span><span class="chip">Performance & High Availability</span><span class="chip">Unit Testing</span><span class="chip">TDD / BDD</span><span class="chip">Integration Testing</span><span class="chip">Code Review</span><span class="chip">Agile / Scrum</span><span class="chip">Git</span></div>
</div>
<div class="chip-group reveal">
<h3>Games & Design</h3>
<div class="chips"><span class="chip">Godot 4</span><span class="chip">SpriteKit</span><span class="chip">Procedural Graphics</span><span class="chip">Design Systems</span><span class="chip">Custom UI Components</span><span class="chip">UX Design</span><span class="chip">Pixel Art</span><span class="chip">Photoshop / Illustrator</span></div>
</div>
<div class="cols">
<div class="card reveal">
<h3>Education</h3>
<p><strong>BEng, Computer Science</strong><br>Universidad de León · 2006 – 2011</p>
<p><strong>BEng, Computer Science</strong><br>Kaunas University of Technology · 2008 – 2009</p>
</div>
<div class="card reveal">
<h3>Languages</h3>
<p>Spanish — Advanced<br>English — Advanced<br>Polish — Intermediate</p>
</div>
<div class="card reveal">
<h3>Awards</h3>
<p>Value Based Award<br>Fgulem III Prototypes Contest (2012)</p>
</div>
</div>
</div>
</section>
<section class="page page-contact" id="contact">
<div class="container">
<div class="reveal">
<div class="page-tag"><span class="num">05</span><span class="bar"></span> Contact</div>
<p class="closing-line">Let's build<br>something <a href="mailto:gelemias@gmail.com">good.</a></p>
<p>Have a product to ship, an identity problem to crack, or just want to talk Swift,
Godot or long runs? My inbox is open.</p>
<div class="intro-cta">
<a class="btn btn-primary" href="mailto:gelemias@gmail.com">
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<a class="btn" href="https://www.linkedin.com/in/guillermoRD" target="_blank" rel="noopener">LinkedIn</a>
<a class="btn" href="https://github.com/gelemias" target="_blank" rel="noopener">GitHub</a>
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