Web & Infrastructure
AWS (EC2/S3), cPanel/WHM, Linux CLI, DNS, Cloudflare, SSL, backups.
Developer • Programmer • Student
Justin D'Costa
Building modern digital experiences with code, AI, and product thinking.
I’m a proactive and versatile computer science student with a strong technical foundation, hands-on product development experience, and a multidisciplinary background in web, infrastructure, AI, and digital media.
- Available immediately
- Bilingual in English & French
- Full-stack + cloud + AI
About
Technical breadth with practical execution.
I combine a rigorous operational mindset with hands-on development experience across web apps, infrastructure, AI tooling, and multimedia production. From cloud hosting and Linux operations to prompt engineering and full-stack implementation, I build solutions that are efficient, scalable, and user focused.
My work spans custom web applications, digital marketing optimization, product UX, and automation workflows. I enjoy turning ideas into polished experiences while staying grounded in performance, reliability, and continuous improvement.
Skills
Core expertise across development, operations, and AI.
Development Stack
React.js, Node.js, PHP, Python, SQL, HTML5/CSS3, Flutter, Dart.
AI & Optimization
Prompt engineering, LLM token optimization, AI system integration.
Digital Marketing
SEO, Core Web Vitals, schema markup, GA4, GTM, Meta Pixel.
Content & Design
Premiere Pro, DaVinci Resolve, After Effects, Photoshop.
Methodology
Agile/Scrum, Git/GitHub, client support, ticketing, problem solving.
Projects
Selected work and product experiments.
Frenmot
Web AppCustom web application designed to support French language learning and progression.
Kaj – Task Reminder
Flutter • DartCross-platform reminder app with personalized alerts and synced task management.
Atmoxis
React • Node.jsProduction-quality weather app with a premium interface and atmospheric visuals.
ScreenDusk
Desktop AppLightweight Windows utility that applies a dimming filter for privacy and comfort.
Décideur 3D
HTML • CSS • JSInteractive 3D decision tool using a secure random lever mechanism for fair selection.
Classic Snake
HTML5 Canvas • JSModern, fluid browser remake of the iconic arcade game with responsive controls.
Experience
Professional and independent work across delivery and teaching.
2025
Courier Delivery Driver
Stuart • Paris, France
Managed on-demand logistics and delivery operations across the Paris network.2023–2025
Private Tutor
Maths, Physics, English
Delivered structured academic support in science and language disciplines.2020–2025
Independent Video Editor
Freelance
Managed end-to-end post-production workflows for international clients and content teams.Education
Academic background and ongoing development.
Bachelor in Computer Science
EPITA • Paris, France
Diplôme Universitaire d'Études Françaises (DUEF)
Université Savoie Mont Blanc • Chambéry
Cambridge A-Level (Advanced)
Academia • Dhaka, Bangladesh
Contact
Let’s build something valuable together.
I’m open to freelance work, development collaborations, and opportunities involving web products, digital experiences, and smart technical solutions.
- Phone: +33 7 64 81 40 45
- Email: contact@justindcosta.dev
- LinkedIn: linkedin.com/in/justindcosta
- GitHub: github.com/JustinDCosta
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