Sonia CostaSoftware Developer & Engineer · Dublin
EN
EnglishFrançais
Dublin, IrelandRemote / Hybrid / On-sitePermanent or freelancePortuguese (native) · English (fluent)

I build full-stack web and mobile products end to end — clean, maintainable, and ready for production.

7+years of experience
5documented stories

Full-stack developer with 7+ years of experience across PHP, JavaScript, React, and Python, delivering scalable web applications and mobile solutions. Known for bridging frontend polish with solid backend architecture, integrating AI tooling into workflows, and mentoring junior developers.

Full-stack developer with 7+ years of experience across PHP, JavaScript, React, and Python, delivering scalable web applications and mobile solutions. Known for bridging frontend polish with solid backend architecture, integrating AI tooling into workflows, and mentoring junior developers. Based in Dublin, currently working at VigiTrust while pursuing a Computer Engineering degree.

PHP · MySQL · JavaScript · HTML5 · CSS3 · Git

7+years of experience
5documented stories

Selected work · 5 proofs

Achievements

VigiTrust Limited Self-reported

Reduced user management time by 50% by architecting a full-stack document management system compliant with ISO 27001:2022

Reduced user management time by 50% while ensuring ISO 27001:2022 compliance.

PHPMySQLJavaScript
One Sky Collective Self-reported

Increased development velocity by 35% by applying AI coding tools including GitHub Copilot and Codex

Increased development velocity by 35%.

GitHub CopilotCodex
Self-directed · 2024 - 2025 Self-reported

Achieved 95%+ average across ICDL certifications in Cyber Security, AI and Coding Principles

Achieved 95%+ average score across all certifications.

3certifications
VigiTrust Limited Self-reported

Decreased code integration conflicts by 20% within 2 months by centralising version control across 6+ GitHub repositories

Decreased code integration conflicts by 20% within 2 months.

6+repositories
GitGitHub
VigiTrust Limited Self-reported

Reduced manual setup tasks and errors by 85% by leading an e-learning platform integration with the company's e-commerce site

Reduced manual setup tasks and errors by 85% for sales and customer success teams.

PHPWordPressWooCommerce

Proven in the work

Technical Expertise

  • PHPin 2 projects
  • GitHubin 2 projects
  • GitHub Copilotin 2 projects
  • MySQLin 1 project
  • JavaScriptin 1 project
  • Gitin 1 project
  • WordPressin 1 project
  • WooCommercein 1 project
  • Codexin 1 project

Proven by experience

  • Agile / Scrum6 yrs
  • HTML54 yrs
  • CSS34 yrs
  • Laravel4 yrs
  • REST APIs2 yrs
  • TypeScript2 yrs
  • React2 yrs
  • React Native2 yrs
  • Python1 yrs
  • Data Analytics1 yrs
  • Claude Code<1 yrs
  • Figma<1 yrs
  • Tailwind CSS<1 yrs

Also worked with

jQueryAJAXJSONPostgreSQLCode reviewDebuggingTestingDjangoDjango REST FrameworkSQL ServerWeb Security Principles

Timeline

  1. Software Developer · VigiTrust Limited

    PHP · MySQL · JavaScript · Git · GitHub · Claude Code · VS Code · REST APIs

    • Reduced user management time by 50% by architecting a full-stack document management system compliant with ISO 27001:2022
    • Designed a multi-region data synchronisation architecture consolidating tracking data across 4 regions
    • Integrated Claude Code into development workflows to support AI-assisted development, testing and code reviews

  2. React Native Developer | Frontend & Mobile | Part-time · One Sky Collective

    React Native · TypeScript · Tailwind CSS · Figma · GitHub Copilot · Codex

    • Increased development velocity by 35% by applying AI coding tools including GitHub Copilot and Codex
    • Built reusable, responsive cross-platform mobile UI components from Figma designs using React Native and TypeScript

  3. Career Break — Technical Upskilling and Career Transition · Self-directed

    Python · TypeScript · React · Data Analytics · AI · Cloud Computing · Scrum · CMS platforms

    • Achieved 95%+ average across ICDL certifications in Cyber Security, AI and Coding Principles
    • Advised 3 non-profit organisations on UX/UI, AI tools and CMS platforms, leading to revamped digital effectiveness
    • Completed 500+ hours of hands-on practice across Python, TypeScript, React, Data Analytics, BI, Cloud Computing and Scrum

  4. Application Developer · VigiTrust Limited

    PHP · Laravel · WordPress · WooCommerce · JavaScript · HTML5 · CSS3 · Git

    • Decreased code integration conflicts by 20% within 2 months by centralising version control across 6+ GitHub repositories
    • Reduced manual setup tasks and errors by 85% by leading an e-learning platform integration with the company's e-commerce site
    • Mentored 2 junior developers through Agile sprints, conducting code reviews across 5,000+ lines of code

  5. PHP Developer · Aubay Portugal

    PHP · CodeIgniter · OOP · MVC · JavaScript

    • Delivered 5+ features within the first 2 months using PHP/CodeIgniter with OOP/MVC
    • Contributed to a 50% increase in user satisfaction by implementing real-time data dashboards and notification systems

  6. System Analyst · Optigest | Optisolution - Consultoria em Gestão e Informática, Lda

    REST APIs · PHP · JavaScript · Requirements analysis · Google Maps API

    • Contributed to a 35% increase in client revenue within the first year by integrating REST APIs for payment, Google Maps and booking services
    • Achieved 90% client retention by partnering with clients on requirements analysis and delivering customised software solutions

About

Full-stack developer with 7+ years of experience across PHP, JavaScript, React, and Python, delivering scalable web applications and mobile solutions. Known for bridging frontend polish with solid backend architecture, integrating AI tooling into workflows, and mentoring junior developers. Based in Dublin, currently working at VigiTrust while pursuing a Computer Engineering degree.

Degrees · Certifications

  • Bachelor of Engineering — Civil EngineeringUniversidade do Minho
  • Specialization (Post-Graduation) — IT & Computer Programming ("Qualifica IT")Universidade do Minho
  • IT Specialist in Artificial Intelligence; AWS AI Practitioner (in progress)Cenit College & eCollege
  • Bachelor of Engineering — Computer EngineeringUniversidade Aberta
  • Data AnalyticsICDL
  • Coding PrinciplesICDL
  • Artificial IntelligenceICDL
  • Cyber SecurityICDL

Let's talk.