Pablo Sebastián Sánchez, Developer in Córdoba, Cordoba, Argentina
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Pablo Sebastián Sánchez

Verified Expert  in Engineering

VoIP Developer

Córdoba, Cordoba, Argentina
Toptal Member Since
September 28, 2015

Pablo is a software/telecommunications engineer with a strong background in SW development, project management (agile and traditional), networking/VoIP, and electronics. He has experience leading SW development/IT/Testing teams in multi-cultural environments, and is a proactive fast learner. He also has experience designing and implementing software (Java, C/C++, Android, Assembler, VBA, Perl, Shell Scripting).


Startup (Social location app)
Android Studio, Eclipse, Java, Android SDK, Android
Foundation Nativos Digitales (Mercadolibre)
Android Studio, Eclipse, Java, Android SDK, Android
Claro (AMX)
Mobile Networks, Value-added Services (VAS), Project Management




Preferred Environment

Eclipse, Qt Reactor, Windows, Linux, Git

The most amazing...

...framework I've built is an interworking framework to make SIP apps, like a RFC 3428 to TS 24.011 bridge. It allows non-RFC-compliant interconnecting stacks.

Work Experience

Android Architect/Developer

2015 - 2015
Startup (Social location app)
  • Architected and developed a social location app prototype.
Technologies: Android Studio, Eclipse, Java, Android SDK, Android


2015 - 2015
Foundation Nativos Digitales (Mercadolibre)
  • Trained developers in Java and Android.
Technologies: Android Studio, Eclipse, Java, Android SDK, Android

Senior Telecommunications Engineer/Project Manager

2013 - 2015
Claro (AMX)
  • Managed projects for VAS development projects.
  • Evaluated and selected VAS platforms (Starhome, Tecnotree, Emblacom, Gemalto, etc).
  • Engineered new VAS.
  • Coordinated VAS deployment.
  • Coordinated and/or executed acceptance tests.
  • Troubleshot VAS-related issues.
  • Created budgets, documentation, and presentations.
Technologies: Mobile Networks, Value-added Services (VAS), Project Management

Senior Software Engineer

2012 - 2012
  • Developed a compiler for a WDL (Work Definition Language) used to convert the WDL into JMeter's XML configuration files to improve the time to develop test cases.
Technologies: Domain-specific Languages (DSLs), Apache JMeter, Performance Testing, QA Automation, Web Services, Shell Scripting, Perl, JavaScript, JSON, XML, Java, ANTLR

Senior Software/Telecommunications Engineer/Project Leader

2004 - 2012
  • Led several technical teams (software testing/equipment interoperability certification/software development).
  • Designed and developed a performance test tool for SIP servers.
  • Designed and developed a SIP interworking framework to create SIP services, like a RFC 3428 to TS 24.011 bridge, a SIP registrar, and a SIP stacks interworking service.
  • Designed and implemented data and voice networks.
  • Integrated SIP equipment.
  • Trained development/integration teams.
  • Evaluated and purchased IP-PBXes, APs, AP controllers, routers, and switches.
  • Managed projects.
  • Tested software in a VoIP system project.
  • Developed new features and maintained a wireless communication system used by the EEUU police department.
  • Developed technical documentation for many projects.
  • Worked as a Java developer/tester in an RFID assets tracking project.
  • Designed and executed Linux embedded performance tests in an RFID assets tracking project.
  • Performed software production process related tasks (CMMI 5).
  • Worked as a requirements engineer for a set-top box project.
Technologies: Networks, Wireless, WAN, LAN, Telephony, Mobile, Public Switched Telephone Network (PSTN), Multiprotocol Label Switching (MPLS), PBX, Proxies, VoIP, Embedded Linux, TCP/IP, Security, Routing, SDP, RTCP, RTP, SIP, Shell Scripting, Windows, Linux, MySQL, Java, Perl, C++, C

RS232-OBDII Interface

The hardware and software for a RS232 to OBDII (ISO 9141-2) interface. It is based on a PIC 16F628 and developed in C and Assembler.

Home Automation System Using Power Line Communication

The hardware and software of a home automation system using Power Line Communication (compliance with EN50065-1). It is based on the TDA5051 modem, PIC 16F628 (slaves) and PIC16F877 (controller). It was developed in C and Assembler.

Automatic Acid Battery Charger/Equalizer

Hardware and software for an automatic acid battery charger/equalizer. It is based on a PIC 16F877 and developed in C and Assembler.

SIP Voice Echo Server

A SIP voice echo server which can be used to test SIP phones. Developed using PJSUA2 and QT.
2007 - 2011

Master's Degree in Data Networks

UNLP (Universidad de la Plata) - La Plata, Argentina

2009 - 2010

Associate's Degree in Project Management

PMValue - Buenos Aires, Argentina

2000 - 2001

Associate's Degree in Data Networks

Cisco Networking Academy - Córdoba, Argentina

1997 - 2001

Bachelor's Degree in Telecommunications Engineering

Universidad Blas Pascal - Córdoba, Argentina




Kamailio, Wireshark, IBM Rational ClearQuest, Git, Microsoft Project, Android Studio, Eclipse IDE, Apache JMeter, FreeSWITCH, Microsoft Visual Studio, Cisco Unified Communications Management Suite, ANTLR


Core Telephony, OpenSIPs, Android SDK, Qt, Selenium


Windows, Linux, Android, Eclipse, Embedded Linux, Mobile, NetBeans


Perl, C, XML, Java, Visual Basic for Applications (VBA), C++, Assembler, JavaScript, Domain-specific Languages (DSLs), UML

Industry Expertise

Project Management


Scrum, Load Testing, Test Automation, CMMI, Object-oriented Programming (OOP)




Routing, Ethernet, Microsoft 365, Proteus VSM, Microcontroller Programming, CCNA, TCP/IP, VoIP, SDP, SIP, Network Programming, Requirements & Specifications, Wireless Protocols, Performance Analysis, SSL, RESTful Web Services, RTCP, RTP, Unix Shell Scripting, NAT, Qt Reactor, Shell Scripting, Security, Proxies, PBX, Multiprotocol Label Switching (MPLS), Public Switched Telephone Network (PSTN), Telephony, LAN, WAN, Wireless, Networks, Web Services, QA Automation, Performance Testing, Value-added Services (VAS), Mobile Networks, MPLAB

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