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Hi, I’m Celestino Ruas, a Senior Backend and Full-Stack Developer based in Cascais, Portugal. I design and scale cloud-native microservices and web applications with a strong focus on performance, reliability, and cost efficiency. Over the past 12+ years I’ve delivered solutions for finance, gaming, and media industries, leveraging PHP, Node.js, TypeScript, and cloud platforms like AWS and Azure. I enjoy turning complex technical challenges into robust, scalable systems and collaborating with global teams to ship high-quality software that meets business goals.…Hi, I’m Celestino Ruas, a Senior Backend and Full-Stack Developer based in Cascais, Portugal. I design and scale cloud-native microservices and web applications with a strong focus on performance, reliability, and cost efficiency. Over the past 12+ years I’ve delivered solutions for finance, gaming, and media industries, leveraging PHP, Node.js, TypeScript, and cloud platforms like AWS and Azure. I enjoy turning complex technical challenges into robust, scalable systems and collaborating with global teams to ship high-quality software that meets business goals.

Celestino Ruas

Full Stack Developer, Back-End Developer, Web Developer, +2

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Hi, I’m Celestino Ruas, a Senior Backend and Full-Stack Developer based in Cascais, Portugal. I design and scale cloud-native microservices and web applications with a strong focus on performance, reliability, and cost efficiency. Over the past 12+ years I’ve delivered solutions for finance, gaming, and media industries, leveraging PHP, Node.js, TypeScript, and cloud platforms like AWS and Azure. I enjoy turning complex technical challenges into robust, scalable systems and collaborating with global teams to ship high-quality software that meets business goals.…Hi, I’m Celestino Ruas, a Senior Backend and Full-Stack Developer based in Cascais, Portugal. I design and scale cloud-native microservices and web applications with a strong focus on performance, reliability, and cost efficiency. Over the past 12+ years I’ve delivered solutions for finance, gaming, and media industries, leveraging PHP, Node.js, TypeScript, and cloud platforms like AWS and Azure. I enjoy turning complex technical challenges into robust, scalable systems and collaborating with global teams to ship high-quality software that meets business goals.

Available to hire

Hi, I’m Celestino Ruas, a Senior Backend and Full-Stack Developer based in Cascais, Portugal. I design and scale cloud-native microservices and web applications with a strong focus on performance, reliability, and cost efficiency. Over the past 12+ years I’ve delivered solutions for finance, gaming, and media industries, leveraging PHP, Node.js, TypeScript, and cloud platforms like AWS and Azure.

I enjoy turning complex technical challenges into robust, scalable systems and collaborating with global teams to ship high-quality software that meets business goals.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

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Expert

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Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

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Intermediate

Language

Portuguese

Fluent

Spanish; Castilian

Fluent

English

Fluent

Work Experience

Backend Developer at Asset Management Firm (Paris, France)

February 28, 2025 - September 22, 2025

Architected Symfony APIs integrated with Azure and DocuSign to digitize contracts for France's #1 real estate investment platform (€1B+ annual funding). Achieved 88% digital funding adoption, eliminating paper bottlenecks and ensuring EU audit compliance, streamlining operations for 1B+ investors.

Full-Stack Developer at Europe's Largest Digital Publisher (Netherlands)

December 1, 2022 - September 22, 2025

Led migration of autowereld.nl's legacy PHP monolith to Kubernetes post-acquisition, cutting infrastructure costs by €20K/year and enabling seamless integration into DPG's platform. Deployed Apache Solr to improve search latency and saved €250K/year in CDN costs.

Full-Stack Developer at UK Betting Platform

September 30, 2018 - September 22, 2025

Architected Laravel backend with RabbitMQ for fault-tolerant payment processing during peak traffic. Modernized AngularJS frontend for improved bet placement UX. Mentored 2 junior developers through code reviews and AWS/CI/CD training, reducing onboarding time and knowledge silos by ~20%.

Full-Stack Developer at Leading European Online Betting Platform - 10M+ Users

March 31, 2017 - September 22, 2025

Architected scalable Laravel backend with RabbitMQ for reliable payments and introduced frontend modernization to improve user experience. Contributed to team growth through mentoring and improving CI/CD practices.

Full-Stack Developer at Pioneer in Streaming Media, London, UK

August 31, 2015 - September 22, 2025

Modernized CMS for 35% faster page loads and 20% lower maintenance costs by applying modern JavaScript and AWS best practices. Led migration of EMEA/LA TAM websites to self-owned AWS infrastructure using vanilla PHP, building a modular CMS with real-time translations and SEO optimization to improve ad ROI.

Software Developer at Brazil (Various Companies)

December 31, 2007 - September 22, 2025

Began career 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 honing backend development skills.

FullStack Developer at BuukMeGroep (The Hague, Netherlands)

February 1, 2025 - Present

Built a digital menu platform to modernize restaurant operations and improve efficiency.

Backend Developer at CORUM Investments (Paris, France)

February 1, 2025 - September 22, 2025

Built and scaled a digital contract system, reducing paper usage by 98% and enabling EU-compliant, real-time portfolio tracking.

FullStack Developer at DPG Media (Europe’s Largest Digital Publisher)

December 1, 2022 - September 22, 2025

Deployed Apache Solr to cut search latency by 40% and migrated PHP monolith to Kubernetes, reducing infra costs by €120K/year.

FullStack Developer at Unibet (Leading Online Betting Platform – 10M+ Users)

March 1, 2017 - September 22, 2025

Architected a scalable payment system using Laravel and RabbitMQ; improved landing page conversions by 22% (€1.2M/year).