Dedicated, results oriented and experienced in PBX and voice applications , Call Centers, SBC, SMS and business automation, CRM, billing systems and custom software development with more then 15 years of a freelance experience. I believe in a simplistic approach with a clean and effective code. I always provide support to my projects and never leaving my clients alone with a problem.
I will be happy to help you in the following fields:
Design and implementation of the VOIP PBX and callcenters platforms based on asterisk, freeswitch and cisco solutions
API architecture and development, API Integrations of any complexity
Database Design, Optimization and maintenance
Contact centers based on hosted pbx platforms asterisk, freeswitch, Genesys, Ringcentral, etc
Maintenance of the production environments based on linux, cisco, juniper
Mysql Database Optimization and Clustering
Linux Clustering and High Availability platforms
High Load Platforms
Colocation/Cloud/Mixed platforms
Kamailio and freesbc/prosbc session border controller and sip proxies
SMS and Voice Bulk sending solutions
Billing platforms and Business Automation
MySQL, Asterisk, FreeSwitch, NGINX, Kamailio, OpenSIPs, Google Go, PHP, NODE.JS and JavaScript.
And last but not least, I'm not mixing my freelance projects with a full time job. Freelance is my full time job and I do all my projects with 100% dedication to it.
Only serious clients please. Our time is priceless so lets try to spend it wisely.
All my solutions are coming with 2 month of free bug fixes and maintenance.
I can guarantee that with me you will get the best of breed solution for your problem but
it wont be cheap.
Asterisk
MySQL Programming
MariaDB
Network Design
Kamailio
VoIP PBX
API Development
Linux System Administration
Avaya
VoIP Administration
VoIP Software
MySQL
FreeSWITCH
FreePBX
Omar R.
Santiago, Dominican Republic
$99/hr
4.9
61 jobs
I have strong expertise in MySQL, SQL Server, MongoDB, PostgreSQL, PHP, Laravel, Vue.js, Node.js, Linux, and ViciDial.
With over 20 years of experience, I specialize in designing, developing, and delivering high-performance, scalable solutions, including complex call center systems and custom VoIP integrations.
Asterisk
PHP
Perl
Node.js
Microsoft VBScript
MySQL
Unix Shell
VICIDIAL
SQL
Java
Laravel
MongoDB
Vue.js
FreePBX
Trixbox
Microsoft Visual Studio
Ambiorix R.
Santo Domingo, Dominican Republic
$35/hr
5.0
282 jobs
I’m a VoIP specialist with extensive experience building solutions using Asterisk, FreePBX, and FreeSWITCH. I’m also a Phone AI agent developer with a strong background in AI phone agents based on the OpenAI API, ElevenLabs, and the VAPI framework.
As a top Twilio developer, I work extensively with Twilio SMS and Voice APIs, integrating communication systems with external platforms.
I also work with traditional call center solutions such as VICIdial, including IVRs, auto-dialers, and API integrations.
Additionally, I’m a full-stack developer skilled in Python, Node.js, JavaScript, and PHP, with experience in both relational and non-relational databases, delivering end-to-end solutions from backend to frontend.
Asterisk
MySQL
jQuery
Twilio API
AJAX
Node.js
HTML5
PHP
JavaScript
Flutter
Session Initiation Protocol
Linux System Administration
Twilio
Android
Francis G.
Santo Domingo Este, Dominican Republic
$70/hr
4.9
23 jobs
Backend and DevOPS Engineer from the Dominican Republic with more than 10 years of experience building and maintaining end to end scalable IT solutions.
Tech Stack:
Programming Languages: Rust, Javascript, Python.
Web Backend: FastAPI, NodeJS (Express), PostgreSQL, MongoDB, API (REST, GraphQL, GRPC), RabbitMQ, Apache Kafka.
DevOPS: Gitlab, nginx, Redis, Docker, Kubernetes, Linux, Terraform.
Cloud: AWS, Azure.
Networking: CCNA, CCDA, CCNP, VoIP (Asterisk and Kamailio).
Windows Server
Python
Amazon Web Services
Linux
Docker
NGINX
Kubernetes
Network Security
VPN
VoIP
Firewall
NodeJS Framework
Cisco Certified Network Professional
PostgreSQL
PfSense
Sanny D.
Santiago, Dominican Republic
$45/hr
4.9
76 jobs
Senior Cloud & Infrastructure Architect with 15+ years in IT and 8+ years designing and operating production environments across Azure, AWS, GCP, and on-premises. I specialize in transforming fragmented infrastructure into secure, automated, and observable platforms that developers and businesses can rely on.
I combine deep hands-on experience (Linux/Windows, networking, PBXs, virtualization) with architectural and leadership skills: assessing existing environments, defining target architectures and roadmaps, and then implementing them using Infrastructure as Code and CI/CD.
Key domains and strengths
Cloud architecture & migration (Azure, AWS, GCP): landing zones, hub-and-spoke VNets/VPCs, private endpoints, WAF, Application Gateway / ALB / NLB, API Management, Front Door, S3/Blob/File services, backup & DR.
Containers & orchestration: Kubernetes (AKS, EKS, K8s on-prem), Docker, ECS/Fargate, Helm/Helmfile, service networking, ingress/TLS, and secure app deployments.
DevOps, SRE & automation: Terraform, Bicep, Ansible, Azure DevOps, GitHub Actions, Jenkins, automated provisioning, configuration management, blue/green & canary releases, environment promotion (Dev/QA/Prod), cost optimization and capacity planning.
Systems administration:
Linux (Red Hat, CentOS, Debian, Ubuntu, SUSE, Fedora) – hardening, services, clustering.
Windows Server – AD, DNS, DHCP, PKI, Group Policy, LDAP, remote access, file services.
Networking & security: routing, VPNs (site-to-site and remote access), SD-WAN, Cisco (routers, switches, ASAs), firewalls, NSGs/NACLs, SSL/TLS, identity and SSO (AD, Azure AD, GSuite, SAML/OIDC), vulnerability management and monitoring.
Virtualization & private cloud: VMware ESXi, Proxmox, XCP-ng, CloudStack, HA clusters, Ceph/RBD, storage design, templates and golden images.
Collaboration & tooling: Atlassian (Jira, Confluence, Bitbucket), Git-based workflows, documentation and knowledge transfer for operations teams.
Voice, PBX & real-time communication
Design, deployment and troubleshooting of Asterisk-based systems: FreePBX, Elastix, FusionPBX, Vicidial, goAutoDial, Kamailio.
Call center and contact-center solutions, SIP trunks, IVRs, CRM integrations, and high-availability VoIP clusters.
What I typically help clients with
Auditing and redesigning existing cloud/on-prem environments for reliability, security, and cost.
Implementing end-to-end platforms: from network and identity, to Kubernetes/ECS, to CI/CD pipelines.
Building repeatable infrastructure using Terraform/Bicep/Ansible and integrating it into DevOps workflows.
Troubleshooting complex production issues (performance, connectivity, security, scaling) and delivering clear RCA and remediation plans.
Designing and deploying robust PBX/contact-center and unified communications solutions.
I work comfortably with minimal supervision, but I also collaborate closely with developers, security, and operations teams to align architecture with business goals. If you need a hands-on architect who can both design the solution and implement it in production, let’s talk.
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