Marcelo Félix

Telco/CS Eng @telnyx

Profile

Telco and CS Engineer working in VoIP Operations, with a background in Software Programming and Networking. Broad knowledge, from Real-Time Protocols to Infra, with troubleshooting experience. Eager to learn more about about SRE, Linux, Networking, VoIP, DevOps, Coding, Monitoring, Cloud Computing, Automation, Microservices and Containers. Enthusiastic about open source, writing and experimenting in a Homelab.

Professional Experience

Telnyx

DevOps Engineeer, specialised in RTP communications (SIP proxies), using kamailio and developing in python, go.

Talkdesk

Professional Services Voice specialist responsible to diagnose and solve complex Call Quality issues (QoS, Network configuration) in the CCaaS and SIP trunk setup between multiple SBC/PBX and a CPaaS (such as Twilio) with E2E troubleshooting and Service Delivery.

Tier 2 responsible to diagnose and solve Call Quality (QoS, Network configuration) and REST API platform issues for several external integrations and SIP trunks. Acting as main POC for vendors/carrier/partners and liaison between engineering and support teams. Identify, document, replicate and triage on product bugs and develop internal tools.

Celfocus

In the Unified Communications team, with the Vodafone One Net (UCaaS Hosted IP PBX) and GCC service, working as:
Service Operations, working as a SRE (Site Reliability Engineer). Sysadmin of Red Hat Linux, SIP Trunks, PBX, Middleware Java EE AS (Weblogic), ActiveMQ JMS Broker and NOKIA mCAS. Responsible to deploy and maintain the availability of custom apps.
Familiarity with multiple Databases (InfluxDB, Postgres, TimesTen, OracleDB)
Development of tools and scripting (bash, python) for monitoring and automation.
Technical Support, as Tier 2, using ITIL practices. Experience with Fault and Change management.
Able to provide solutions to customers and work with multiple providers.
Manage the acceptance and deploy of new product releases. Provide On-Call support and work well under pressure. Able to troubleshoot Networking issues and REST/SOAP Web Services. Knowledge of VoIP, SIP Flows in the IMS Network.

Capgemini

Project with the Celfocus UC Service Operations team, with the Vodafone One Net and SIP Trunking. Experience in:
Weblogic Server administration (WebCenter Content, Portal, OSB and SOA)
Administration of Unix/Linux Servers, PBXs and development of tools/scripts.
ITIL Service Support, with Tier 2 VoIP/SIP, network diagnostics and troubleshooting.
Oracle PL/SQL and SQL SERVER DB management and query tuning.

Education

Técnico - Universidade de Lisboa

Specialisation in Telecommunications and Computer Science
Knowledge of: Fundamentals of Communications, Propagation and Radiation and Telecommunication Networks and Systems.
Development of programming skills in C, JAVA and MATLAB. SQL, DB modulation and Entity relationship diagrams. Additional basic knowledge of Mathematica, HTML5, Javascript, PHP.

Certifications

WebLogic Server 12c Administrator

Skills

– Software Eng programming in Python, Go, Bash, git.
– Linux (RedHat/Debian), Docker containers and Kubernetes Administration.
– Automation and CI/CD Ansible, Packer, Vagrant and Jenkins.
– Monitoring with ElasticSearch (ELK), Prometheus and Grafana.
– Understanding of Networking (TCP/IP) routing and switching.
– Experience in RTC SIP/RTP Protocols, IMS Network, WebRTC, SIP Servers/Proxies (Kamailio).
– Interaction with multiple Databases (PostgresDB, InfluxDB, OracleDB).
– Homelab with Proxmox VE virtualization.

Organizations

Best

Course about telecommunications, with students around Europe.

SystemsGroup

Youth Association with IT services and aim to support entrepreneurship and the creation of junior companies.

República "A Desordem dos Engenheiros"

A fraternity house connected to Instituto Superior Técnico. Here, I have been involved with all tasks regarding financial, human and material resources. I was also in charge of the diplomatic relationships with other fraternities and institutions and its organized events.

Volunteering

Colégio Maria Auxiliadora

The leader in a short-term GASTagus project: management of a 5 volunteers team, supervisor of the project design and implementation and cooperation with local NGOs.

ACRIDES

Volunteer in the GASTagus project in the outskirts of Praia: Cooperate with a local NGDO, ACRIDES, giving training to children, teenagers and adults in several subjects in the field of education for development and Leader in the next year

Leigos para o Desenvolvimento

Supporting immigrant children in school underachievement and integration at Centro S. Pedro Claver.

GASTagus

NGDO where I received 120 hours of training in education for development and fundraising our international volunteer project. Collaborator, responsible for volunteers recruitment and training, as well as financial, logistic coordination and activity planning for youth volunteers for short-term international projects