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Python
Azure
TensorFlow
PyTorch
Amazon Lex
AWS ML (Amazon Machine learning services)
Google Document AI
Keras
Kubeflow
Linear models
LLaMA
ollama
OpenCV
OpenVoice
PCA
Prompt Engineering
Spacy
Transformer models
vLLM
Whisper
Matplotlib
NLTK
Pandas
Pillow
Pvporcupine
Seaborn
KVO
p5.js
Decision Tree
ETL
Jupyter Notebook
AWS
AWS Boto3
AWS LightSail
GCE
GCP BigQuery
Google Docs
API
Google API
Asterisk
Sublime Text
Core Audio
Docker
MSCS (Microsoft Cluster Server)
Unity
MIP
MIPS
MLP
MMS
MMS-TTS
PELCO-D
Rhino Grasshopper
VoIP
...

* Data Scientist with a Master’s Degree in Computer Science and extensive experience in machine learning, deep learning, and cloud services ( Azure,AWS and GCP). * 7 years of experience, proficient in building ML pipelines and deploying scalable solutions. * Developed and deployed a voice-to-voice pipeline for a call center VoIP system using Whisper, Llama, and MMS-TTS, including API integrations and Docker deployment. * Implemented a Google Doc AI Wrapper, improving document recognition accuracy through advanced preprocessing techniques. * Designed a deforestation detection system using clustering and Azure-based services to monitor forest areas.

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Seniority Senior (5-10 years)
Location Kharkiv, Ukraine
C/C++/C# 5yr.
Robot Framework 5yr.
.NET Core 5yr.
ASP.NET Core Framework 5yr.
ASP.NET MVC Pattern
Google Spreadsheets
Microsoft Azure Data Factory
Power BI
Cosmos DB
Memcached
Microsoft SQL Server
MongoDB
Neo4j
PostgreSQL
relational databases
SQL
AWS EC2
AWS Fargate
AWS Lambda
AWS SQS
Azure Blob Storage
Cloud Functions
GCP Storage
Google Docs
API
JWT
OAuth
RESTful API
Winforms
CD DevOps pipelines
Jenkins
DDD
DRY
microservices
GitHub
Linux
Unix
QA Automation
Visual Studio
CRM
ERP
Freeswitch
IaaS
MFA
PaaS
Polly
RBAC
VoIP
...

Senior .NET Developer with over a decade of professional experience, showcasing advanced competencies in scalable and secure web application development, microservices architecture, and cloud solutions. Expertise in crafting optimized code by leveraging C#, ASP.NET Core, Entity Framework, and diverse databases like MS SQL Server and MongoDB. Proven track record in improving system performance, maintainability, and accelerating development cycles through SOLID principles and modern DevOps practices. Demonstrated ability touring in enterprise-level API development, and security enhancements, further leveraging CI/CD, containerization, and serverless technologies in both Microsoft Azure and AWS environments. Adept in applying design patterns and software engineering principles like CQRS, DDD, and the Akka.NET actor model to build robust and fault-tolerant systems.

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Seniority Senior (5-10 years)
Location Ukraine
Python 10yr.
PostgreSQL 10yr.
Redis 10yr.
Django 10yr.
MariaDB 5yr.
MySQL 5yr.
JavaScript
PHP
aiohttp
AsyncIO
Pandas
pytest
Twisted
Ajax
CSS
HTML
HTML5
XML
JSON
FireBird
MongoDB
SQL
SQLAlchemy
Asterisk
Eclipse
PyCharm
Sublime Text
Bash
EMacs
Shell Scripts
BitBucket
Git
GitHub
SVN
Celery
Falcon
Flask
Tornado
DNS
FTP
HTTP
HTTPS
ICMP
TCP/IP
UDP
Docker
Docker Compose
FreeBSD
Linux
Windows
GraphQL
RESTful API
Jenkins
Jenkins CI
microservices architecture
SOAP
Nginx
Selenium Webdriver
CGI
Noodles
Nose
Python IDLE
Twisted Framework
VoIP
...

- 10+ years of experience in Analysis, Design, Development and Implementation of various web, stand-alone, client-server applications using Python; good Experience with Python web frameworks such as Django, Flask, Pyramid Framework, Tornado, Twisted, AioHTTP; have work experience with various Python Integrated Development Environments like PyCharm, Eclipse, Emacs; - Expertise in handling Django ORM and SQLAlchemy; experienced in developing applications using Agile Methodologies, Waterfall Methodology and Scrum stories in a python based environment; - Have knowledge in relational databases like MySQL (MariaDB),PostgresSQL, Firebird; have knowledge in NoSQL databases like Redis, MongoDB; - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Kryvyi Rih, Ukraine
NVDA
Browser Stack
Zephyr
TalkBack
CSS 5yr.
HTML 5yr.
SQL 5yr.
Cloud Functions 5yr.
API testing 5yr.
QA Automation 5yr.
Usability tests 5yr.
VmWare 5yr.
Unix 5yr.
STLC 5yr.
Test Case 5yr.
Test Planning 5yr.
Pixel Perfect
Sales Force Cloud Commerce
Kibana
Azure
Black-box Testing
Chrome Developer Tool
TestLink
TestRail
Zeplin
Swagger
Atlassian Confluence
Jira
Axure
InVision
FortiClient VPN
VPN
AMP validator
Chrome Extensions
EDGE
Google Chrome
Internet Explorer
Mozilla Firefox
Opera
Pixel Ruler
Safari
TFS
View Horizon
VoIP
Yandex Browser
...

- 7+ years in Web and Mobile QA strategies - Expertise in accessibility compliance standards such as WCAG 2.1 and WCAG 2.2 - Proficiency with assistive technologies, including screen readers (NVDA, VoiceOver, TalkBack). - Documentation and Reporting, Cross-functional Collaboration. Test Plan creation, creating test documentation for Automation - Strong analytical and problem-solving skills, proven communication skills and conflict resolution, product ownership - Highly proficient with a range of tools including Jira, Browser Stack, VMWare, and Salesforce, - Demonstrates a solid grasp of both manual and automation testing strategies and a history of optimizing functional, non-functional, and UI/UX aspects of sophisticated platforms such as trading, e-commerce, and CRM systems. - Bug’s life cycle, roles and activities in project team, positive/negative tests, smoketesting, GUI, cross-browser, compatibility, black-box, gray-box, functional, non- functional, unit testing, regression testing. - Huge experience in mobile application testing on IOS and Android operating systems. - Hands on experience using emulators for Android and IOS e.g. Blue Stack - Creation of test plans, test cases, test suite, checklists, bug reports. - Knowledge of Test Design technics. Understanding of SDLC, methodologies and the difference between types of testing.

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Seniority Senior (5-10 years)
Location Ukraine
SRE 15yr.
Microsoft Office 365 6yr.
juniper
Symfony
Microsoft SQL Server
MySQL
Oracle Database
PostgreSQL
AWS
GCP
AWS RDS (Amazon Relational Database Service)
Hyper-V
Apache Tomcat
Docker Swarm
KVM (for Kernel-based Virtual Machine)
VmWare
vSphere
FreeBSD
HP-UX
Linux
macOS
SunOS
Unix
ITIL
ITSM
Kafka
RabbitMQ
Kubernetes
OTRS
1C
1C BAS
Billing solutions
cisco
Cisco servers
Esx
Extreme
GPO (Group Policy Object)
GSM Networking
Horizon
HP
ITILv3
Juniper Dell
Lenovo
Microtik
NT4.0
openbgpd
Qemu
Server2019
Sigtran Basic
SS7 Basic
Supermicro
VoIP
win3.1
windows rds
...

- IT and Telecom specialist - Specialities: UNIX and UNIX-Like OSes (FreeBSD, Linux, SunOS, MacOS X) - Over 20years of Windows/windows server family. From NT4.0 /win3.1 up to Server2019. As well as upgrading Up to 15 years with server hw, 13 years with storage solutions. - 6 years with Microsoft 365 - Esx server/vsphere 5.0-7.0, hyper-v, freebsd bhyve - Able to translate configs between cisco/extreme/juniper/openbgpd etc. - ITILv3 associate, strong in ITIL/ITSM - Linux/macos (as well as server)/ FreeBSD/HP-UX - Available ASAP - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Uzhgorod, Ukraine

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Our journey starts with a 30-min discovery call to explore your project challenges, technical needs and team diversity.
Manager
Maria Lapko
Global Partnership Manager
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Want to hire VoIP developer? Then you should know!

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How and where is VoIP used?

  • Customer Support: Streamlining communication
  • Remote Work: Enhancing collaboration
  • Conference Calls: Facilitating meetings
  • Cost Savings: Reducing expenses
  • Integration: Connecting different platforms
  • Mobile Apps: Improving accessibility
  • Emergency Services: Ensuring quick responses
  • Education: Enabling virtual classrooms
  • Healthcare: Enhancing telemedicine
  • International Business: Simplifying global communication

Compare Junior, Middle, Senior, and Expert/Team Lead VoIP Developer roles

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior1-2 years
  • Code testing
  • Bug fixing
  • Basic feature development
$50,000
Middle3-5 years
  • Module development
  • Performance optimization
  • Technical documentation
$70,000
Senior6-8 years
  • Architecture design
  • Team mentoring
  • Project management
$90,000
Expert/Team Lead8+ years
  • Strategic planning
  • Cross-team collaboration
  • Technical leadership
$120,000

Quick Facts about VoIP.

  • VoIP Software Development was born in 1995
  • Popular projects like Skype rely on this tech
  • Entry to VoIP dev requires basic programming skills
  • Most popular related tech is SIP protocol
  • Fun fact: The first VoIP call was made in 1974!

TOP VoIP Related Technologies

  1. Twilio (John, 2008)
  2. Asterisk (Mark, 1999)
  3. FreeSWITCH (Anthony, 2006)
  4. Kamailio (Daniel, 2001)
  5. SIP.js (Jill, 2011)

What are top VoIP instruments and tools?

  • Zoiper: Developed by Zoiper, released in 2003
  • 3CX: Crafted by 3CX, hit the scene in 2005
  • Skype for Business: Rolled out by Microsoft in 2015
  • Asterisk: A creation of Digium, emerged in 1999
  • Jitsi: Released in 2003, Jitsi is a gem from Atlassian
  • FreePBX: A gift from Sangoma, entered the market in 2004
Table of Contents

Talk to Our Expert

Our journey starts with a 30-min discovery call to explore your project challenges, technical needs and team diversity.
Manager
Maria Lapko
Global Partnership Manager

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FAQs on VoIP Development

What is a VoIP Developer? Arrow

A VoIP Developer is a specialist in the VoIP framework/language, focusing on developing applications or systems that require expertise in this particular technology.

Why should I hire a VoIP Developer through Upstaff.com? Arrow

Hiring through Upstaff.com gives you access to a curated pool of pre-screened VoIP Developers, ensuring you find the right talent quickly and efficiently.

How do I know if a VoIP Developer is right for my project? Arrow

If your project involves developing applications or systems that rely heavily on VoIP, then hiring a VoIP Developer would be essential.

How does the hiring process work on Upstaff.com? Arrow

Post Your Job: Provide details about your project.
Review Candidates: Access profiles of qualified VoIP Developers.
Interview: Evaluate candidates through interviews.
Hire: Choose the best fit for your project.

What is the cost of hiring a VoIP Developer? Arrow

The cost depends on factors like experience and project scope, but Upstaff.com offers competitive rates and flexible pricing options.

Can I hire VoIP Developers on a part-time or project-based basis? Arrow

Yes, Upstaff.com allows you to hire VoIP Developers on both a part-time and project-based basis, depending on your needs.

What are the qualifications of VoIP Developers on Upstaff.com? Arrow

All developers undergo a strict vetting process to ensure they meet our high standards of expertise and professionalism.

How do I manage a VoIP Developer once hired? Arrow

Upstaff.com offers tools and resources to help you manage your developer effectively, including communication platforms and project tracking tools.

What support does Upstaff.com offer during the hiring process? Arrow

Upstaff.com provides ongoing support, including help with onboarding, and expert advice to ensure you make the right hire.

Can I replace a VoIP Developer if they are not meeting expectations? Arrow

Yes, Upstaff.com allows you to replace a developer if they are not meeting your expectations, ensuring you get the right fit for your project.