I’m Alexandra Costin, a Computer Science graduate working across website design, app production, backend development, cybersecurity and ethical penetration testing. I build clean, responsive and practical digital products with strong structure, modern interfaces and reliable functionality.
My technical skills include Java, React, Python, backend systems, full-stack development, web application security and pentesting methodology. I focus on creating digital products that are user-friendly, scalable and built with security in mind from the start.
Choose what you want to build and see the type of work I can help plan, design, develop or review from a security perspective.
I help turn ideas into clean, modern and reliable digital products, from visual design and backend functionality to authorised penetration testing and security-focused improvements.
Modern, responsive websites designed for individuals, businesses, portfolios, landing pages and digital project ideas.
Mobile app concepts and early-stage builds designed around clear user flows, clean interfaces and practical functionality.
Authorised security testing for websites and applications, focused on identifying weaknesses and improving the overall security of a digital product.
A simple process for turning an idea into something structured, modern, secure and usable.
I start by understanding what you want to build, who it is for, what the goals are and what the product needs to do.
I shape the structure, pages, user flow and visual direction so the product feels clear, modern and easy to use.
I develop the product, connect the required functionality, review the security side and improve the final result with polish.
A quick preview of projects, experiments and digital ideas. The full collection will live on the portfolio page.
A personal website and digital space for projects, notes, development progress and portfolio work.
A service marketplace idea focused on connecting people with trusted local service providers.
Interface experiments, scripts, backend ideas and security-focused practice built while developing technical skills.
Let’s turn it into something modern, clean and useful. Whether you need a website, app concept, backend functionality or authorised penetration testing, I can help shape, build and improve it.