Software architect with 25+ years of hands-on backend and full-stack development experience, specializing in microservices (PHP, Node.js, TypeScript), cloud platforms (AWS, Azure, Kubernetes), and high-performance web applications in finance, media, and betting sectors. Delivered scalable solutions including digitization of €1B+ annual contracts (98% adoption) at CORUM Investments and legacy PHP monolith migration to Kubernetes (saving €20K/year infrastructure + €250K/year CDN costs) at DPG Media. Self-taught from Clipper at age 14 to modern frameworks; focused on maintainable code, Event Sourcing exploration, and simpler state management. Contribute technical ideas, design solutions, and deliver code in collaborative teams. Seeking senior backend or full-stack roles in fast-paced environments.
Hi, I’m
Celestino Ruas
Cascais
Summary
Overview
28
years of professional experience
1
Certification
Work History
BuukMe – Intelligent Queue ManagementCascais, Portugal
Full-Stack Developer
01.2026 - Current
Job overview
- Built core platform modules using Laravel backend, Inertia.js, and React frontend to support real-time, responsive web applications for business process optimization.
- Developed WaitingRuum intelligent queue management system with AI-powered triage, document photo analysis for automated data extraction/pre-filling/error checking, process verification, and scheduled arrivals—achieving 100% paperwork readiness on arrival, reduced customer wait times, eliminated physical lines, minimized data entry errors and churn, and transformed lobbies into efficient productivity spaces through seamless integrations and data-driven insights.
- Implemented real-time features (WebSockets), responsive UIs, and workflow optimizations to improve operational efficiency, customer satisfaction, and business outcomes; includes demo videos and showcase repositories.
Suntransfers.com
Backend Developer
10.2025 - Current
Job overview
- Implemented new features and resolved bugs in PHP Symfony, Yii v1, .NET, and legacy codebases to maintain platform stability and performance.
CORUM Investments (Asset Management Firm – €8B AUM)Paris, France
Backend Developer
01.2023 - 02.2025
Job overview
- Architected Symfony REST APIs integrated with Azure and DocuSign to enable full contract digitization for France's leading real estate investment platform (€1B+ annual funding volume).
- Achieved 88% digital adoption rate among investors, removed paper-based processing delays, met EU regulatory audit requirements, and streamlined workflows for 1B+ investor operations.
DPG Media Group (Europe's Largest Digital Publisher)Netherlands
Full-Stack Developer
04.2019 - 12.2022
Job overview
- Implemented Apache Solr search engine for gaspedaaal.nl, reducing search latency by 40% and cutting CDN costs by €250K/year.
- Directed legacy PHP monolith migration for autowereld.nl to Kubernetes post-acquisition, lowering infrastructure costs by €20K/year and enabling seamless integration into DPG ecosystem.
MyClubBetting (UK Betting Platform)
Full-Stack Developer
04.2017 - 09.2018
Job overview
- Architected Laravel backend with RabbitMQ for fault-tolerant payment processing during peak traffic, preventing revenue loss from legacy system failures.
- Modernized AngularJS frontend to improve bet placement user experience.
- Mentored 2 junior developers through code reviews, AWS, and CI/CD training, reducing knowledge silos and onboarding time by 20%.
Unibet (Leading European Online Betting Platform – 10M+ Users)
Full-Stack Developer
10.2015 - 03.2017
Job overview
- Revamped landing pages using PHP and WordPress, increasing conversions by 22% and generating €1.2M/year in additional revenue.
- Modernized content management system for 35% faster page loads and 20% lower maintenance costs using JavaScript and AWS optimizations.
RealNetworks (Pioneer in Streaming Media)London, UK
Full-Stack Developer
08.2012 - 08.2015
Job overview
- Led migration of EMEA/LATAM websites to self-hosted AWS infrastructure using vanilla PHP, reducing time-to-market by 50% and dependency on centralized Tokyo control.
- Built modular CMS with real-time multi-language translations and SEO-optimized meta tags, achieving top Google rankings and 20% higher ad ROI.
- Reduced maintenance costs by 30% through AWS optimizations and enhanced data-driven marketing tracking.
WebFinancial GroupMadrid, Spain
Full-Stack Developer
01.2007 - 01.2012
Job overview
- Developed secure, scalable websites and financial web applications using PHP for international clients in the finance sector.
- Adapted to emerging technologies to deliver high-performance projects on schedule.
Early CareerBrazil
01.1998 - 01.2007
Job overview
- Started at age 14 with Clipper, self-studying via books and courses to build systems, including a management tool for an insurance brokerage.
- Transitioned to PHP in 1998, developing websites for Brazilian companies and building backend development expertise.
Education
Estácio de Sá UniversityBrazil
Bachelor's Degree from Network Administration & Web Development
University Overview
Skills
- Backend: PHP (Laravel, Symfony, Yii), Nodejs, TypeScript, AdonisJS, REST APIs, GraphQL APIs, Ruby on Rails
- JIRA
- Agile
- HTML5 expertise
- Frontend: Reactjs, Nextjs, Inertiajs, Tailwindcss, Shadcn
- Mobile: React Native
- DevOps & Cloud: Docker, Kubernetes, AWS, Azure, CI/CD (GitHub Actions)
- Tools & Practices: Agile (Scrum), Git, PHPUnit, Jest, Test-Driven Development (TDD), SOLID Principles, Domain-Driven Design (DDD)
- Data & Messaging: RabbitMQ, MySQL, MongoDB, WebSockets (Socketio)
- RESTful API development
- Microservices architecture
Certification
- Laravel Certification (Coursera)
- Modern Web Development Bootcamp (Rocketseat: Next.js, Node.js)
Languages
English (Fluent)
Portuguese (Native)
Spanish (Fluent)
Timeline
Full-Stack Developer
BuukMe – Intelligent Queue Management
01.2026 - Current
Backend Developer
Suntransfers.com
10.2025 - Current
Backend Developer
CORUM Investments (Asset Management Firm – €8B AUM)
01.2023 - 02.2025
Full-Stack Developer
DPG Media Group (Europe's Largest Digital Publisher)
04.2019 - 12.2022
Full-Stack Developer
MyClubBetting (UK Betting Platform)
04.2017 - 09.2018
Full-Stack Developer
Unibet (Leading European Online Betting Platform – 10M+ Users)
10.2015 - 03.2017
Full-Stack Developer
RealNetworks (Pioneer in Streaming Media)
08.2012 - 08.2015
Full-Stack Developer
WebFinancial Group
01.2007 - 01.2012
Early Career
01.1998 - 01.2007
Estácio de Sá University
Bachelor's Degree from Network Administration & Web Development