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Viktor Khalamivskyi

Technical Support Specialist | Junior Android Developer

Ukraine
Phone: [open contact info](look above in the "contact info" section)
Email: [open contact info](look above in the "contact info" section)
LinkedIn: [open contact info](look above in the "contact info" section)
GitHub: github.com/viktorKhDev

Professional Summary

Technical Support Specialist with 5+ years of experience supporting business software, users, network infrastructure, and telecommunications equipment.

Experienced in troubleshooting software and network issues, configuring routers and VoIP gateways, and working with SIP-based telephony systems. Have a working understanding of SIP communication and basic knowledge of FreeSWITCH and Asterisk.

Also have hands-on experience in Android development using Java and Kotlin, with knowledge of Android SDK, REST APIs, databases, Git, and modern Android development tools.

Strong troubleshooting and problem-solving skills, fast learner, responsible and comfortable working independently with complex technical issues.

Technical Skills
Technical Support & Networking
Technical Support and Troubleshooting
TCP/IP
Network Configuration
NAT and Port Forwarding
Routers and Network Equipment
Internet Connectivity Troubleshooting
Windows Administration
Hardware and Peripheral Troubleshooting
VoIP & Telephony
SIP
VoIP Gateways
SIP Registration and Call Troubleshooting
Basic SIP Configuration
Basic FreeSWITCH
Basic Asterisk
VoIP Network Troubleshooting
Android Development
Java
Kotlin
Android SDK
Android Studio
XML
Material Design
Coroutines
Retrofit
Room
SQLite
Dagger
Databases & Development Tools
SQL
JDBC
SQLite
Room
JSON
REST APIs
Git
Maven
IntelliJ IDEA
Eclipse
Professional Experience
Tonotel

Technical Support Specialist
Ukraine | December 2020 – Present

Provide technical support to software users and troubleshoot software, network, and connectivity issues.
Configure and troubleshoot routers, network equipment, and Internet connections.
Configure and troubleshoot VoIP gateways and telephone equipment.
Perform basic SIP configuration and troubleshooting.
Troubleshoot SIP registration, call routing, NAT, port forwarding, and connectivity issues.
Analyze technical issues using system logs and network information.
Have a working understanding of SIP communication and VoIP call flow.
Have basic knowledge of FreeSWITCH and Asterisk and their role in VoIP infrastructure.
Configure and troubleshoot network and telecommunications equipment.
Investigate technical issues, identify possible root causes, and implement solutions.
Assist users with business software and related infrastructure.
Communicate with users to understand technical problems and provide effective solutions.
SMM Instaprofi

SMM Specialist
Kyiv, Ukraine | November 2017 – May 2018

Managed social media content and online communications.
Assisted with day-to-day SMM activities and content management.
Book Market

IT Support Engineer
Kyiv, Ukraine | 2016 – November 2017

Provided technical support to employees and users.
Troubleshot hardware and software issues.
Installed and configured computer equipment and software.
Assisted with network and peripheral device troubleshooting.
Maintained reliable operation of workplace IT equipment.
Android Development Projects
Shop List

Personal Android Application

Personal Android project developed to gain practical experience in Android application development.

Technologies: Java, Android SDK, SQLite, XML

GitHub: github.com/viktorKhDev

Education
Kyiv Technical College of Electronic Devices

Specialist Diploma in Engineering — Metal Processing
2006 – 2010

Languages
Ukrainian — Fluent
Russian — Fluent
English — Reading proficiency; comfortable working with technical documentation
Additional Information
Fast learner with strong technical curiosity
Strong troubleshooting and analytical skills
Responsible and detail-oriented
Comfortable working independently and solving unfamiliar technical problems
Interested in continuous professional development in IT, networking, VoIP, and Android development