VOIP Developer

Company Description

GuestTek™ is a global leader in broadband technology and interactive solutions for the hospitality industry. Since 1997, we have partnered with hotels to maximize your property’s offerings–enhancing your brand, helping you generate more revenue and giving you total confidence you’re delivering a world-class guest experience.

With operations reaching 85 countries and serving more than 3900 hotels, we understand your most critical requirements. Whether it’s an individual property, franchised or corporate location, GuestTek allows you to customize each solution to your property’s needs. And GuestTek’s focus on hospitality means we fully understand and deliver on the technology needs of today’s guests, while engineering the in-room technologies desired by tomorrow’s guests, too.

Our OneView™ platform gives your guests the ultimate in-room experience. With converged HSIA, Video, Data, Voice and mobile applications like myAway and myMedia, we provide a seamless integration of their personal electronic devices. By offering a custom interface, GuestTek brings your hotel branding to every room, reinforcing the value and services of your property every time a guest turns on the TV or logs in to their device.

Because OneView is built in house, proprietary and highly customizable, we offer a flexibility that resellers simply cannot match. GuestTek’s Research & Development teams continually develop new features in response to client or market demands. By consistently providing state-of-the-art-technology, our platform is designed to grow with your business.

GuestTek has experienced significant worldwide growth with the 2014 acquisition of iBAHN & TelNet and the creation in 2015 of a subsidiary; Event Conference Services (ECS). We continue to seek opportunities that expand our capacity to serve more global clients and offer the best in hospitality technology. Our continuous commitment to our clients means we at GuestTek align ourselves with leading providers around the world of satellite and cable television to provide better offerings to your guests, helping them to feel just a little more at home.

Job Description

Responsibilities:

• Design and develop scalable solutions to deliver reliable SIP services to a multitude of distributed endpoints including on premise Call Processing Servers, SIP proxy servers, handsets, and soft-phones.
• Enhance and maintain existing code and participate in design reviews and code reviews with other team members.
• Create custom provisioning tools to automate configuration of voice stack
• Participate in projects intended to improve infrastructure, including the integration of new systems and software
• Draft technical documentation
• Facilitate knowledge transfer to deployment and support teams
• Work with the Production Services and Support leaders towards keeping Service Availability above target.
• Other duties as assigned by management

Tools and Technologies used include:

• SIP protocol and its use in VOIP Services
• SIP proxies and/or SIP PBXs preferably open source products like Kamailio (OpenSER), FreeSWITCH, Asterisk, and FreePBX etc.
• Networking with Switches, Routers, Firewalls, IPSs and Security Appliances
• Programming experience with PHP / Perl / JAVA / C and custom modules with open source products
• Relational Databases ( MySQL), JDBC / ODBC
• Linux server operations, deployment and performance monitoring and shell scripting

Qualifications

Qualifications:

Education / Training:

· University degree in Computer Engineering, Computer Science or equivalent.

Mandatory Skills & Experience:

• Experience coding and debugging Asterisk source code.
• Highly proficient in PHP, Perl and MySQL
• Knowledge of software design best practices.
• Proficient using source code management systems.
• Proficient understanding of SIP, MGCP, H323.
• Strong understanding of a hosted, highly available environment.
• Proficient with configuring Asterisk, including writing dialplan and custom application code.
• Knowledge of common configuration methods of endpoints (TR-069, HTTPS, TFTP).
• Working knowledge of T1/E1/J1 interfaces, PRI/EuroISDN, CAS, R2 and other protocols.
• Working knowledge of Analog Telephony interfacing.
• Familiarity with Linux system administration.

· Familiarity with SQL Cluster configuration and administration (MariaDB/Galera a plus).

· Experience with a moderately complex AWS or similar environment, including: VPC, subnetting in AWS, managing EC2 instances.

· Experience with formal change management.

· 4+ years of experience developing VoIP Applications and Integrations.

Nice to have:

• Solid understanding of Telecommunications best practices.
• Working knowledge of SAN environments, a plus.
• Experience inspecting network traffic from a voice perspective a plus.
• Experience trouble shooting cooper, optical and wireless backbone a plus.
• Experience using Visio or similar applications to build network, telecom and call flow diagrams a plus.
• Experience configuring Kamailio SIP or similar server is a plus.
• Experience configuring Oracle Acme packet SBC is a plus.
• Experience with DevOps tools and methodologies, particularly with Puppet is a plus.
• Experience with various Property Management System (PMS) interfacing and development a plus.
• Experience with Hospitality Call Accounting interfacing a plus.
• Knowledge of wire shark or similar products a plus.
• Familiarity with enterprise monitoring and logging platforms (Zabbix, Nagios, Cacti, etc) a plus.
• Familiarity with basic layer 2/3 networking, including subnetting, assigning IPs, etc. a plus.

Additional Information

Personal Attributes:

· Possess excellent written and verbal communication capabilities.

· Problem solver that can work both independently and as a member of a team.

· Ability to work well under pressure in a constantly changing environment with minimal supervision.

· Driven by intellectual curiosity and focused on excellence in service delivery.