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Yasen Kostov

intro

Say Hi from Yasen Kostov, Full Stack Developer specializing in the Elixir world

I'm a dedicated Full Stack Developer currently working at the Innovative Department of Telespazio GmbH. I specialize in Elixir Phoenix and have a passion for application architecture and integrating AI models for faster, more productive development. When I'm not coding, you'll find me competing in table tennis at a semi-pro level.

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about me

Building Modern Applications with Elixir Phoenix

I'm a Full Stack Developer with 3+ years of experience in Elixir Phoenix, currently working at Telespazio GmbH's Innovative Department. What sets me apart is my ability to multitask effectively - balancing my 9-6 job, my studies in cybersecurity at Technical University of Sofia and my personal life.
I've participated in international hackathons, including placing 4th with my team at a competition organized by Sorbonne University in Paris.

3+

YEARS OF EXPERIENCE

15+

PROJECTS COMPLETED

Resume

Education

Cybersecurity

Technical University of Sofia / 2022 - 2027

Currently pursuing a degree in Cybersecurity, focusing on secure application development, network security, and ethical hacking practices.

International Hackathon Competition / 2024

Sorbonne University, Paris

Achieved 4th place with my team in an international hackathon organized by Sorbonne University, demonstrating my ability to work effectively under pressure and in collaborative environments.

Mathematics

Academic Nikola Obreshkov, Burgas / 2017 - 2022

Graduated from this prestigious mathematics school with a strong foundation in analytical thinking and problem-solving skills essential for software development.

Experience

My professional experience spans from working in innovative corporate environments to developing custom solutions for private clients, with a focus on Elixir Phoenix development.

Full Stack Developer

Telespazio GmbH / 2024 - Current

Working in the Innovative Department developing applications with Elixir Phoenix. Focused on architectural design and integrating AI models to increase development productivity and application performance.

Freelance Developer

Self-employed / 2022 - 2024

Developing custom web solutions using Elixir Phoenix for private clients. Projects range from simple portfolio sites to complex web applications with comprehensive features and security implementations.

Intern Developer

Orbis Digital Solutions / Summer 2022

Gained valuable team development experience at this Digitall subsidiary. Worked with Java and Spring frameworks, learning enterprise software development practices and collaborative coding environments.

my services

Building Robust Web Applications with Modern Technologies

I am good at comprehensive development services focusing on Elixir Phoenix and full-stack web development. Whether you need a simple portfolio site or a complex web application with advanced features, I can deliver reliable, scalable solutions. I have also worked with different frameworks, such as RoR, Flutter and Spring

ux

Web Development

Specializing in Elixir Phoenix for backend development with responsive frontend design. Creating robust, scalable web applications with modern architecture patterns.

android

API Development

Building secure, efficient APIs that connect your web applications with other services. Implementing proper authentication and data validation for reliable integrations.

web

Database Design

Creating optimized database structures focusing on PostgreSQL. Implementing efficient queries, proper indexing, and robust data models for your application's needs.

marketing

AI Integration

Implementing AI models into web applications to enhance functionality and user experience. Leveraging machine learning for data analysis and process automation.

portfolio

Showcasing My Projects and Developments

Here are some of my most notable projects, demonstrating my skills in Elixir Phoenix development, database design, and creating secure, feature-rich applications.

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Secure Voice and Chat

Social Application

Friendczar Project

Chat Application

food_app

Your kids - safer

with us

Decima.Live

Parental Control App - WIP

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Table tennis

all about it

TennisMasa.click

Sports management system

bank_app

Personal Github

account

Small tools in Github account

Other small project such as youtube downloader and book downloader

contact us

Get in touch!

contact

+359 888 042 080

gmail

contacts@ykostov.dev

map

Sofia, Bulgaria

© ykostov.dev 2025. All rights reserved.

Secure API Design Patterns with Phoenix

Cybersecurity | December 18, 2023

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In today's digital landscape, API security is a critical concern for developers. Phoenix Framework provides excellent tools for creating secure APIs, but it's essential to implement proper design patterns to fully leverage these capabilities. This article explores key security patterns you can implement in your Phoenix applications.

Authentication and authorization are fundamental aspects of API security. Phoenix offers various options for implementing these, from simple token-based authentication to more complex OAuth2 flows. We'll examine these options and discuss when each is most appropriate for your application's needs.

  • Implementing robust token-based authentication in Phoenix
  • Rate limiting strategies to prevent abuse
  • Proper error handling that doesn't leak sensitive information
  • Input validation and sanitization techniques
  • CORS configuration best practices
  • Data encryption in transit and at rest
  • Regular security auditing and dependency updates
Phoenix's Plug architecture provides a powerful way to implement security measures in a composable, maintainable manner. By creating custom plugs for various security concerns, you can create a robust security pipeline that protects your API endpoints while keeping your code clean and organized.
By Yasen Kostov
Implementing proper security in your Phoenix APIs from the beginning will save significant time and potential headaches later.
Remember that security is not a one-time implementation but an ongoing process. Regularly reviewing your authentication mechanisms, updating dependencies to patch known vulnerabilities, and staying informed about emerging security threats are all essential practices for maintaining secure APIs. In the next article, we'll dive deeper into implementing JSON Web Tokens (JWT) in Phoenix applications with practical code examples.
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By following the security patterns outlined in this article, you'll be well on your way to creating Phoenix APIs that not only perform well but also provide robust protection for your application's data and your users' information. Security doesn't have to be a burden - with Phoenix's elegant architecture, you can implement comprehensive security measures without sacrificing code quality or developer experience.
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