# Parminder Nayyar Chhatwal > Lead Engineer at ReferralExchange Location: San Francisco Bay Area, United States Profile: https://flows.cv/parminder ## Work Experience ### Lead Engineer @ ReferralExchange Jan 2019 – Present ### Software Engineer @ ReferralExchange Jan 2017 – Present ### Sr. Software Engineer @ Federated Media Publishing, Inc. Jan 2012 – Jan 2017 As a tech lead for the core ad platform team, documented technical specifications, designed and implemented scalable interactions with Google’s ad serving platform(DFP) and sales management platform (DSM). Lead Integrations with various social media APIs to collect performance metrics across campaigns - Facebook Graph API, Google Analytics, Pinterest, Instagram and Video Metadata. Created release plans for production release and post-release support for many critical projects. ### Software Engineer @ VMware Jan 2012 – Jan 2012 | Palo Alto Designed and implemented backend for an internal application to manage research studies using LAMP stack ### Software Developer @ Adteractive Jan 2011 – Jan 2012 I am involved in creating and building portals and applications using PHP, HTML, CSS, JavaScript, jQuery and maintaining the MySQL databases. My work includes the following: • Designed and developed a job search portal to search jobs from a third party job sites using their web service API. This portal helped in generating education leads for EDU business. Implemented pixel to track conversion. • Dynamic Landing Page Project: The main purpose of this project was to give the business team a flexibility to change and test various landing pages to enable media buying. • Integrated school forms by writing xml files that can be parsed by Smarty template engine to generate content. • Responsible for handing over PHP and DB builds to QA team for every week release. • Hands-on experience using SoapUI, Charles, deploying DB and PHP builds, running tomcat web servers for Validation services, testing Java applications on tomcat, working with Memcached to test school integrations. ### Sr. Software Engineer @ Rancore Technologies Jan 2007 – Jan 2009 - Development of a high-availability solution for the ICSCF (Interrogating – Call Session Control Functionality) node of IMS, based on 3GPP Release 7. The product is developed using Radvision SIP and DIAMETER stacks, and OpenSAF Middleware. - Research on new IMS services, RFCs, Design, Coding, Debugging, Load Testing and Code Reviews. - Developed Session Managers for Registration, Initial Requests, Diameter Cx Interface towards HSS, Rf Interface Application part. Simulators for Cx interface Server/ HSS, Rf interface Server. -Created a web FAQ for 3GPP specs using PHP (using Zend MVC), HTML, JavaScript. - Language - C++; PHP, HTML Platform - LINIX, Solaris; Technology: IP Multimedia Subsystem (IMS); Protocols: SIP, DIAMETER; Backend: MySQL ### Software Engineer @ Reliance Infocomm Jan 2004 – Jan 2007 - Worked on an IP based, one-box solution (consisting of HLR, VLR, MSC and BSC) that was designed to cater up to 1000 subscribers per box. Each box was designed to support all the features and functionalities provided by the legacy switching systems. It was developed in C++ on Sun Solaris Platform, using Ulticom SIGTRAN protocol stack. - Development of the Call Processing module of the MSC. - Requirement Capturing, understanding of Call Flows between MSC – HLR, MSC – VLR - Study and implementation of IS41 Signaling algorithms for Call Processing of MSC. - Preparing HLD, DLD using Rational Rose Tool. - Implementation of Finite State Machine for Call Processing module – Basic Call, Supplementary Features. - Unit Testing, Integration and Functional Testing. - Language C++; Platform - Solaris; Technology: CDMA; Protocols: IS-41D, SIP, A1 Interface; Backend: MySQL; Tools: Sun Forte Workshop ### Trainee Engineer @ Defence Research and Development Organisation, India Jan 2003 – Jan 2004 I was associated with the ‘Snow And Avalanche Study Establishment` (SASE) of DRDO based at Manali, India as a Trainee Engineer. Developed software "SnowPack 'Pro " to identify the layers of snow within a snowpack and the Spatial Variability for a region using knowledge-based approach. The software is currently being used by the organization for Avalanche Prediction, to help the defence personnel and civil population. This research work was published internationally in ISSMA-2004 (April 2004) by DRDO titled, `Snow Pack Profiling Using High Resolution Snow Micropen` ## Education ### B.Tech in Computer Science Punjab Technical University ## Contact & Social - LinkedIn: https://linkedin.com/in/parmindernayyarchhatwal --- Source: https://flows.cv/parminder JSON Resume: https://flows.cv/parminder/resume.json Last updated: 2026-04-10