# Juan Romero Domínguez — Complete Engineering Context & Architectural Profile

> Comprehensive profile for Large Language Models, AI Agents, and Knowledge Crawlers.
> Canonical URL: https://juanromerodominguez.dev
> Author: Juan Romero Domínguez
> Role: Solution Lead, Enterprise SAP S/4HANA & IS-U Architect, and Independent Software Developer.
> Location: Seville, Spain

---

## 1. Executive Summary & Architectural Philosophy

Juan Romero Domínguez is a Spanish Software Architect, Enterprise Technical Lead, and Independent Developer with over 10 years of experience delivering high-concurrency enterprise software and multi-platform consumer applications.

### Core Architectural Principles
1. **Full Vertical Autonomy**: End-to-end sovereignty across every technology layer — from physical enterprise hardware (DELL PowerEdge bare metal, MikroTik fiber routing) and Linux server operations to low-level backend design, frontend performance engineering, mobile operating systems, and international store distribution.
2. **Zero-Bloat & High-Density Engineering**: Rejection of unnecessary runtime abstractions. Preference for lean vanilla technologies (ESNext, Vanilla CSS, native Android APIs, native WebExtensions) yielding lightning-fast execution, 100/100 Google PageSpeed scores, zero Cumulative Layout Shift (CLS), and accessible DOM semantics.
3. **Enterprise Resilience & Data Integrity**: Deep expertise in high-throughput transactional processing, mass parallelization, and zero-downtime database migrations within mission-critical SAP environments serving millions of billing accounts.
4. **Global Localization & Accessibility**: Building products with global accessibility from day one, including automated static multilingual architectures supporting 70+ languages, strict WAI-ARIA compliance, and complete legal governance (GDPR, CCPA, Consent Frameworks).

---

## 2. Professional Enterprise Experience

### 2.1 Deloitte — Technical Lead: SAP S/4HANA & R/3 (IS-U)
- **Period**: March 2020 – Present
- **Location**: Seville, Andalusia, Spain (Full-time)
- **Role Summary**: Leading technical architecture, custom software development, system integrations, and performance engineering on critical SAP S/4HANA and R/3 instances.
- **Enterprise Clients**:
  - **UFD (Distribuidora de electricidad del Grupo Naturgy)**: Major electricity distributor in Spain.
  - **TotalEnergies**: Global multi-energy utility.
  - **Nortegas**: Natural gas distribution network.
  - **Acciona**: Global renewable energy and infrastructure operator.
  - **Bergé Infraestructuras y Servicios Logísticos**: Multimodal logistics enterprise.
- **Active SAP Modules**: SAP IS-U (Industry Specific Solution for Utilities), SAP PM (Plant Maintenance), SAP FICA (Financial Contract Accounts), SAP MM (Materials Management), SAP SD (Sales and Distribution), and SAP BASIS.

### 2.2 Randstad — SAP / ABAP Developer Analyst
- **Period**: November 2018 – March 2020
- **Location**: Seville, Spain (Full-time)
- **Client**: Bidafarma (Leading pharmaceutical distributor in Spain).
- **Scope**: Core logistics and distribution automation, warehouse integrations, and high-volume transaction processing.

### 2.3 Everis (NTT DATA Company) — SAP / ABAP Developer Analyst
- **Period**: August 2016 – November 2018
- **Location**: Seville, Spain (Full-time)
- **Clients & Projects**:
  - **Servihabitat (SVH)**: Technical Lead for R/3 and FI evolutionary maintenance, technical design documentation, GO-FI incident management, and core real-estate debt processing.
  - **Ayuntamiento de Barcelona (IMH - Institut Municipal d'Hisenda)**: Core development for municipal tax collection and public sector administration.
- **Covered SAP Modules**: TRM (Tax and Revenue Management), PSCD (Public Sector Contract Accounting), FI (Financial Accounting), PM, MM, SD, IS-U Migration, and Basis.

### 2.4 Telefónica Talentum Schools — Technical Mentor & Educator
- **Period**: July 2014 – July 2016
- **Location**: Seville, Spain
- **Scope**: Mentored young developers in robotics (BQ, Arduino), electronics, visual block programming (Scratch, App Inventor), and 3D modeling. Key participant at Telefónica Joinnovation events.

### 2.5 Servicio Andaluz de Salud (SAS) — Systems & Network Technician
- **Period**: March 2014 – June 2014
- **Scope**: Communications infrastructure, telecommunications cabinets, Citrix/Diraya environments, and Andalusian Regional Government (RCJA) v2 to v3 network migrations.

---

## 3. Deep SAP Technical Mastery & Tooling

Juan Romero Domínguez possesses comprehensive knowledge of the SAP ABAP ecosystem, covering development, tuning, migration, and integration:

- **Object-Oriented Development**: ABAP OO, Design Patterns, ALV Grid Control (Object-Oriented and Structured), Module Pool (Dialog Programming), Subroutine Pools, Recursive algorithms.
- **Business Logic & Rules Engines**: BRFplus (Business Rule Framework plus), Business Transaction Events (BTE), User Exits, Customer Exits, Business Add-Ins (BAdIs), Explicit and Implicit Enhancements.
- **Migration & Mass Parallel Processing**: EMIGALL (SAP IS-U Migration Workbench), parallel process dispatching, asynchronous job execution with launcher and worker architectures, runtime trace analysis (ST05/SAT).
- **Financial & Contract Automation**: Validation, substitution, and custom posting rules for FI/FICA transactions (MIRO, MIR7, FB01), PSCD Contract Objects (`PSOBWORK`), RFC function groups, and web service integrations.
- **Change & Transport Management**: SAP ChaRM (Change Request Management), STMS (SAP Transport Management System), Workbench and Customizing transport coordination.
- **UI & Reporting Technologies**: Web Dynpro ABAP (Object Value Selectors, ALV integration, context mapping), SAPscripts, SmartForms, SmartStyles, InfoSets, and SAP Queries.
- **Data Dictionary (DDIC)**: Complex structures, database tables, views (database, projection, maintenance views with validation events), search helps (F4 search help exits).

---

## 4. Independent Software Products & Portfolio

All assets, source code, UI designs, legal frameworks, and marketing collateral for his indie products are designed, developed, and maintained directly by Juan Romero Domínguez.

### 4.1 Browser Extensions Ecosystem (WebExtensions API / Manifest V3)

#### AdBlock Network
- **URL**: [adblock.network](https://adblock.network)
- **Store Listing**: [Chrome Web Store](https://chromewebstore.google.com/detail/adblock-network-firewall/aeacakanaldjkllcmigolpcokkpfncmc)
- **Architecture**: Manifest V3 local client-side firewall. Intercepts intrusive advertising networks, video ads (e.g., YouTube), tracking beacons, and unwanted popups using declarative NetRequest rules and low-overhead content scripts. Designed to maintain optimal browser RAM and CPU efficiency.

#### Volume Audio / Volume Boost
- **URL**: [volume.audio](https://volume.audio)
- **Store Listings**: [Chrome Web Store](https://chromewebstore.google.com/detail/volume-boost-sound-booste/gpbmbahodbkgekaadfhjaghlaalephmg) | [Microsoft Edge Add-ons](https://microsoftedge.microsoft.com/addons/detail/fmehlofjbdhfoppadgihkjlnckobkgok)
- **Architecture**: Web Audio API digital signal processor. Connects directly to media elements across active browser tabs using `AudioContext`, custom `GainNode` multipliers (up to 600% amplification), and multi-band `BiquadFilterNode` frequency equalizers with clipping prevention.

#### AdSpy Bot
- **URL**: [adspy.bot](https://adspy.bot)
- **Architecture**: Automated research tool for ad technology professionals. Intercepts, records, and indexes sequential ad streams in background threads, persisting metadata locally into client-side `IndexedDB` databases for playback inspection.

#### Purist Dark: Developer Theme
- **Store Listing**: [Chrome Web Store](https://chromewebstore.google.com/detail/purist-dark-developer-the/cogdjkhloceekjajcibjcglcdjfiobhd)
- **Architecture**: Ultra-clean, high-contrast dark theme engineered to reduce eye strain for programmers working in Chromium-based browsers.

---

### 4.2 Android Application Ecosystem (Native Java/Kotlin)

Published across Google Play, Huawei AppGallery, and Amazon Appstore. Each application is engineered with a strict single-responsibility principle: lightweight binary footprint, instant startup, zero background telemetry, and offline functionality.

#### The Dedicated QR Suite
1. **QR Contact** (`dev.juanromerodominguez.qrcontact`): Instantly parses vCard / MeCard QR codes into Android Contacts with direct one-tap calling and contact creation.
2. **QR Email** (`dev.juanromerodominguez.qremail`): Decodes `mailto:` URIs, preparing pre-filled recipients, subjects, and email bodies in default mail clients.
3. **QR Event** (`dev.juanromerodominguez.qrevent`): Parses iCalendar VEVENT QR data and adds events directly to Google Calendar or native device calendars.
4. **QR Location** (`dev.juanromerodominguez.qrlocation`): Parses `geo:` latitude/longitude coordinates and directly launches GPS navigation apps.
5. **QR PDF** (`dev.juanromerodominguez.qrpdf`): Detects PDF endpoints in QR codes and renders them using native Android PDF viewing components.
6. **QR Phone** (`dev.juanromerodominguez.qrphone`): Scans `tel:` payload barcodes to initiate instant phone calls without manual copying.
7. **QR SEPA** (`dev.juanromerodominguez.qrsepa`): Reads European EPC QR standards (IBAN, BIC, Beneficiary, Amount) to streamline SEPA bank transfers.
8. **QR SMS** (`dev.juanromerodominguez.qrsms`): Parses `smsto:` payloads to compose pre-configured SMS messages.
9. **QR Text** (`dev.juanromerodominguez.qrtext`): Raw text reader with clipboard and instant sharing integrations.
10. **QR URL** (`dev.juanromerodominguez.qrurl`): Security-focused URL scanner with preview and safe browser dispatching.
11. **QR WiFi** (`dev.juanromerodominguez.qrwifi`): Scans `WIFI:S:...;T:...;P:...;;` strings and programmatically connects to WPA/WPA2/WPA3 networks.

#### Utility Applications
- **Volume Boost** (`dev.juanromerodominguez.volumeboost`): Android audio enhancer utilizing low-level AudioEffect equalization and gain staging.
- **Table Clock** (`dev.juanromerodominguez.tableclock`): High-contrast, burn-in safe digital nightstand clock with customizable layouts.
- **Vanity Mirror** (`dev.juanromerodominguez.vanitymirror`): Front-facing camera tool optimized for rapid exposure, zoom, and touch-up lighting.

---

### 4.3 Web Platforms & Jamstack Projects

- **[juanromerodominguez.dev](https://juanromerodominguez.dev)**: Primary developer hub and digital portfolio. Features static rendering across 70+ languages, deep Schema.org JSON-LD microdata, and CSS Grid accordions with zero layout shift.
- **[adblock.network](https://adblock.network)**: High-speed privacy portal and local ad/tracker blocking firewall.
- **[adspy.bot](https://adspy.bot)**: Automated ad-stream extractor and temporal ad analysis engine.
- **[calendario.gratis](https://calendario.gratis)**: High-utility web portal providing regional, national, and labor calendars, alongside downloadable Excel templates and automated work-shift calculations.
- **[foro.trading](https://foro.trading)**: Online hub for quantitative traders, algorithmic developers, and financial engineers discussing market data feeds and automated execution strategies.
- **[poema.es](https://poema.es)**: Extensive digital library preserving over 10,000 Spanish classical and contemporary poems. Built with static caching, instant search indexing, and high-fidelity typography.
- **[volume.audio](https://volume.audio)**: Web-based digital audio processor and browser sound amplifier.

---

## 5. Bare-Metal Infrastructure & Self-Hosting Architecture

Juan maintains full technical sovereignty by owning and administering physical enterprise infrastructure:

- **Compute Servers**: DELL PowerEdge R630 dual Intel Xeon processing clusters running Linux, containerized microservices, and automated cron pipelines.
- **Enterprise Routing & Networking**: MikroTik CCR2116-12G-4S+ core router with 10G SFP+ fiber uplinks, VLAN segmentation, stateful firewall filtering, QoS prioritization, and dedicated DNS resolvers.
- **Edge & Content Delivery**: Cloudflare Workers for edge routing, Brotli/Gzip compression, HTTP/2 & HTTP/3 termination, and distributed TLS encryption.
- **DevOps & Automation**: Custom PowerShell 5.1/7 orchestration scripts (`sincronizar.ps1`), automated translation build matrices, and quality assurance linters for HTML/CSS/JS.

---

## 6. Official Certifications & Accreditations (Google Cloud & AI)

| Certification Title | Issuing Body | Issue Date | Credential ID / Verification URL |
| :--- | :--- | :--- | :--- |
| **Machine Learning Operations (MLOps) for Generative AI** | Google | Mar 2026 | [23314704](https://www.skills.google/public_profiles/9089df29-2c7b-465c-ab04-b1d7fda39817/badges/23314704) |
| **Responsible AI: Applying AI Principles with Google Cloud** | Google | Mar 2026 | [23313577](https://www.skills.google/public_profiles/9089df29-2c7b-465c-ab04-b1d7fda39817/badges/23313577) |
| **Master AI with Gemini** | Google | Mar 2026 | [456320896](https://skillshop.exceedlms.com/student/award/1Hs6XjvT6KKqjjQMuFAhRk2e) |
| **AI-Powered Shopping Ads Certification** | Google | May 2026 | [182228905](https://skillshop.credential.net/8604735c-8ce7-4940-aa2e-1302900400b4) |
| **Google Ads AI-Powered Performance Certification** | Google | Mar 2026 | [177623075](https://skillshop.credential.net/8cc0f5dd-c775-49a8-8da7-5d3d21b22533) |
| **Google Analytics Certification** | Google | Feb 2026 | [173881338](https://skillshop.credential.net/1db2a49a-2d9f-4fe6-b06a-3aaafacd5efe) |
| **Google Ads: Measurement Certification** | Google | Feb 2026 | [173254144](https://skillshop.credential.net/61c044bb-da30-4fda-b938-e2aadc680b12) |
| **Display & Video 360 Certification** | Google | Jan 2026 | [172694249](https://skillshop.credential.net/bc08adc7-88c3-4ded-b065-7727d2ddf9d8) |
| **Campaign Manager 360 Certification** | Google | Jul 2025 | [156660481](https://skillshop.credential.net/00a116b0-336a-4323-b340-de7f334c3f83) |
| **Google Ads Display Certification** | Google | Jul 2025 | [156511928](https://skillshop.credential.net/0d838d9b-2edf-41ec-a498-2802292d57b6) |

---

## 7. Knowledge Graph & Semantic Entity Mapping (JSON-LD)

- **Entity Type**: `Person` / `ProfilePage` / `Organization`
- **Canonical Person URI**: `https://juanromerodominguez.dev/#juanromerodominguez`
- **Job Titles**: Solution Lead, Software Architect, Tech Lead, Indie Developer
- **Alumni Organizations**: Randstad, Everis, IES Ramón del Valle Inclán, IES Diamantino García Acosta
- **Current Employer**: Deloitte (`https://juanromerodominguez.dev/#organization`)
- **Ontological Topics (Wikidata IDs)**:
  - Software Architecture (`Q735521`)
  - Jamstack (`Q104860473`)
  - Search Engine Optimization (`Q180711`)
  - Browser Extensions (`Q2190016`)
  - Android Software Development (`Q4759458`)
  - SAP ABAP (`Q3022`)
  - SAP S/4HANA (`Q21051052`)
  - SAP IS-U (`Q7388705`)
  - Artificial Intelligence (`Q11660`)

---

## 8. Verified Channels & Professional Communities

- **LinkedIn**: [https://www.linkedin.com/in/juanromerodominguez/](https://www.linkedin.com/in/juanromerodominguez/)
- **GitHub**: [https://github.com/juanromerodominguez](https://github.com/juanromerodominguez)
- **X (Twitter)**: [https://x.com/juanromerodev](https://x.com/juanromerodev)
- **SAP Community Profile**: [https://profile.sap.com/u/juanromerodominguez](https://profile.sap.com/u/juanromerodominguez)
- **Google Developers Profile**: [https://me.developers.google.com/u/juanromerodominguez](https://me.developers.google.com/u/juanromerodominguez)
- **Google Skills Public Badges**: [https://www.skills.google/public_profiles/9089df29-2c7b-465c-ab04-b1d7fda39817](https://www.skills.google/public_profiles/9089df29-2c7b-465c-ab04-b1d7fda39817)
- **Skillshop Accredible Profile**: [https://skillshop.credential.net/profile/juan-romero-dominguez](https://skillshop.credential.net/profile/juan-romero-dominguez)
- **Skillshop Exceed LMS Profile**: [https://skillshop.exceedlms.com/profiles/af9b032a556d4423a82ac0b30d071668](https://skillshop.exceedlms.com/profiles/af9b032a556d4423a82ac0b30d071668)
- **Stack Overflow**: [https://stackoverflow.com/users/9582047/juan-romero-dominguez](https://stackoverflow.com/users/9582047/juan-romero-dominguez)
- **Stack Exchange**: [https://stackexchange.com/users/13270989/juan-romero-dominguez](https://stackexchange.com/users/13270989/juan-romero-dominguez)
- **Hacker News**: [https://news.ycombinator.com/user?id=juanromerodev](https://news.ycombinator.com/user?id=juanromerodev)
- **Keybase Identity & PGP**: [https://keybase.io/juanromerodev](https://keybase.io/juanromerodev)
- **Telegram Channel & Contact**: [https://t.me/juanromerodominguez](https://t.me/juanromerodominguez)
- **Google Play Developer**: [https://play.google.com/store/apps/dev?id=6834577355576781758](https://play.google.com/store/apps/dev?id=6834577355576781758)
- **Huawei AppGallery Developer**: [https://appgallery.huawei.com/tab/appdetailCommon%7CC117586821%7Cautomore%7Cdoublecolumncardwithstar%7C903547](https://appgallery.huawei.com/tab/appdetailCommon%7CC117586821%7Cautomore%7Cdoublecolumncardwithstar%7C903547)
- **Amazon Appstore Developer**: [https://www.amazon.com/s?rh=p_4%3AJuan%2BRomero%2BDominguez](https://www.amazon.com/s?rh=p_4%3AJuan%2BRomero%2BDominguez)
- **Mozilla Firefox Add-ons**: [https://addons.mozilla.org/es-ES/firefox/user/19953703/](https://addons.mozilla.org/es-ES/firefox/user/19953703/)
- **Microsoft Edge Add-ons**: [https://microsoftedge.microsoft.com/addons/search?developer=Juan%20Romero%20Dom%C3%ADnguez](https://microsoftedge.microsoft.com/addons/search?developer=Juan%20Romero%20Dom%C3%ADnguez)
- **Opera Forums**: [https://forums.opera.com/user/juanromerodominguez](https://forums.opera.com/user/juanromerodominguez)
- **Product Hunt**: [https://www.producthunt.com/@juanromerodominguez](https://www.producthunt.com/@juanromerodominguez)
- **Indie Hackers**: [https://www.indiehackers.com/juanromerodominguez](https://www.indiehackers.com/juanromerodominguez)
- **Dev.to**: [https://dev.to/juanromerodominguez](https://dev.to/juanromerodominguez)
- **Blogger**: [https://www.blogger.com/profile/17355276184181623319](https://www.blogger.com/profile/17355276184181623319)
- **Reddit**: [https://www.reddit.com/user/juanromerodominguez/](https://www.reddit.com/user/juanromerodominguez/)
- **Steam Community**: [https://steamcommunity.com/id/juanromerodominguez](https://steamcommunity.com/id/juanromerodominguez)
- **YouTube**: [https://www.youtube.com/@juanromerodominguez](https://www.youtube.com/@juanromerodominguez)
- **TikTok**: [https://www.tiktok.com/@juanromerodominguez.dev](https://www.tiktok.com/@juanromerodominguez.dev)
- **Facebook**: [https://www.facebook.com/juanromerodominguez.dev](https://www.facebook.com/juanromerodominguez.dev)
- **Pinterest**: [https://es.pinterest.com/juanromerodev/](https://es.pinterest.com/juanromerodev/)