Денис

Denys Tolkachov
Kyiv, Ukraine
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GitHub – https://github.com/mrmarkutan
LinkedIn - [відкрити контакти](див. вище в блоці «контактна інформація»)
Objective: Highly motivated and skilled Java Developer with extensive experience in building and maintaining robust and scalable applications using Java Core, Spring, JPA, Hibernate, and related technologies. Proficient in network protocols, microservices architecture, and possessing strong Linux administration skills. Seeking opportunities to contribute to innovative software projects and leverage my expertise in backend development and network operations.
Skills:
• Programming Languages: Java Core
• Frameworks: Spring, Spring Boot, Spring Data, Hibernate, JPA
• Database: MySQL, Postgresql, ClickhouseDB, JDBC
• Build Tools: Maven
• Version Control: Git (GitHub, GitLab)
• Continuous Integration: Github Actions
• Cloud Platforms: Google Cloud Platform (GCP)
• Cloud Infrastructure: Cloud Infrastructure
• Web Technologies: RESTful Microservices, OOP, ORM, API
• Containerization: Docker
• Networking: TCP/IP, HTTP(S), SSH
• Linux: Kali Linux, Ubuntu, CentOS
• Web Servers: Nginx, Tomcat, Netty
• Testing: JUnit, Mockito, Postman
• Security: Penetration Testing, Nessus, Nmap, Burp Suite, Acunetix, Wireshark
• Other: RegEx (Regular Expressions)
Education:
Master of Science in Cybersecurity | NTUU KPI | 2018
Bachelor of Science in Security of information and communication systems | NTUU KPI | 2017
Courses:
• Google Cloud: DevOps & Architect program, Cloudskillboost Google (May 2023 – Jun 2023)
• Java Programming Basics, Udemy (online)
• Spring Framework 5: Beginner To Guru, Udemy (online)
• Java Design Patterns, Udemy (online)
• SpringBoot Unit Testing with JUnit, Mockito and MockMvc, Udemy (online)
• Java Database Connection: JDBC and MySQL, Udemy (online)
Projects:
Telegram Bot - Music Search with SpotifyAPI
• Developed a pet-project Telegram bot for music searching, integrating SpotifyAPI for music retrieval.
• Utilized Docker for containerization, implementing Github Actions for CI/CD automation.
• Deployed the application on Heroku for seamless accessibility and usage.
Spring Boot Library REST Application
• Created a RESTful Spring Boot application for managing a library, utilizing MySQL for data storage.
• Implemented docker-compose for easy management of application components and dependencies.
Experience:
Junior Java Developer | Blynk | Dec 2021 – Mar 2022
• Contributed to the development of innovative IoT solutions using Java and the Blynk platform.
• Collaborated with cross-functional teams to design and implement features, contributing to the overall architecture and functionality of the software.
• Developed custom features and functionality within Blynk's ecosystem, enhancing the user experience and extending the capabilities of IoT applications.
• Ensured reliable and secure communication between Java-based applications and various hardware platforms, optimizing connectivity and performance.
• Conducted thorough testing using JUnit, Mockito, and MockMvc to ensure the reliability and functionality of the applications.
• Collaborated with cross-functional teams to troubleshoot and debug Java-based IoT applications, ensuring high quality and reliable software.
• Utilized continuous integration and deployment pipelines using Maven, Git and Github Actions, improving the development workflow and ensuring code quality.
• Utilized Blynk's powerful APIs and libraries to integrate Java code with the Blynk platform, enabling seamless device control and monitoring.
• Stayed updated with the latest IoT trends and Java technologies, contributing to the continuous improvement and growth of Blynk's IoT offerings.
Penetration Tester, Security Analyst | SCPC| Dec 2018 – now
• Conducted penetration testing on web applications using tools such as Nessus, Nmap, Burp Suite, Acunetix and Kali Linux pack to identify vulnerabilities and recommend security enhancements.
• Utilized Wireshark to analyze network traffic and identify potential security risks.
• Leveraged Postman to perform comprehensive API testing and ensure the security and reliability of APIs.
• Demonstrated strong Linux administration skills, managing server environments running Kali Linux, Ubuntu, and CentOS.
• Configured and maintained web servers like Nginx, Tomcat, and Netty, optimizing server performance and security.
• Proficiently managed Docker containers to containerize applications and streamline deployment processes.
Languages:
• Fluent in Ukrainian.
• Proficient in English