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Nalini Kumar Danda Mobile: PHONE NUMBER AVAILABLEEmail: EMAIL AVAILABLELinkedIn: https://LINKEDIN LINK AVAILABLESummary of Experience25+ years of experience in Software Industry includes architecture, design, hands-on Engineering and Management in building software applications, products, and components. A team mentor, motivator, decision-maker, and a problem-solver. Coordinated across cross functional teams to achieve mutual goals.11 years of Engineering/Technology Leadership experience in both startups and large organizations. Built Proof-Of-Concepts quickly and evangelized ideas for large impact/implementation to build products. End-to-end automation-focused to cut down inefficiencies, document-based communication to the teams to avoid communication gaps. Followed Agile/Scrum methodologies.15+ years of hands-on expertise in Software architecture and design of applications, systems with strong development practices to achieve high-performance, high-quality software. Experience writing software in technology domains: Internet of Things (IoT)  Smart home/Home Security, Telecom, Video and Voice over IP (VoIP), Network Security (IPsec, IKE, Kerberos), Cloud computing (AWS), distributed systems and stand-alone applications.Full-stack experience using SQL/No SQL, Python 3.10, Node.js, Express.js, Go, Java, Front end using Bootstrap, Typescript, JavaScript, React.js, HTML5, CSS3 and variants such as LESS/SASS. Programmed embedded systems using C/C++.Docker based Container development, Orchestration using Kubernetes. Cloud Architecture/development expertise with AWS tools and services. Working knowledge of GCP. Practiced new technologies: Machine Learning, Artificial Intelligence to build smart systems.Education CertificationsMasters in Computer Science (Machine Learning Specialization) - Georgia Institute of Technology (GeorgiaTech), Atlanta, GAInternet of Things: Roadmap to a connected world  MITx Professional EducationAmazon Certified Solution Architect Associate  SAA-C03Google cloud Onboard trainingExperiencePrincipal Software Engineer (Remote) @ Comcast Corporation Sep 2015  till dateX1 MSO Partnering Layer (XMP):Senior Technical member of the XMP team Syndication Engineering group within Comcast. Responsible for strategic planning, Operational, integration and define technical work for the team. Participate in planning and design of the teams operational environment monitor emerging technologies, practices for potential use within the team and company to meet the needs to Syndication business.Responsible to define architecture for the cloud-based infrastructure (mainly AWS) planning, design and guide the team for implementation. Defined REST APIs using Swagger, worked with AWS API Gateway, SNS/SQS, Lambda, CloudWatch, DynamoDB in a multi-region environment to support uninterrupted service, developed using Python 3.10.Document best practices, Operational visibility practices, runbooks, define CI/CD (Concourse, GitHub actions) practices with zero downtime service.Mentored junior team members at various levels for software development and operational visibility. Define logging infrastructure, format for smoother operational visibility tools (Splunk, Elk/Kibana, Grafana, CloudWatch, Mantis)IOT Platform:Built a new team of developers, worked with senior engineers/architects for the new IoT Platform architecture, mentored test automation engineers, cross functional collaboration to build the IoT Platform to control Smart Home and Home Security devices that leverages AWS IoT Core and consolidates various legacy IoT services.The Platform allows customers of Comcast & Syndication partners Smart home IoT needs such as controlling door locks, lights, thermostats from various vendors (Yale, Kwikset, August locks  Philips Hue, Lifx, Lutron, TPLink, Sengled lights - Google Nest, Ecobee, Honeywell thermostats) through Zigbee and Wi-Fi Radio.Defined SDLC, participated in Quarterly PI planning, owned Sprint planning, Practiced SAFe Agile/Scrum methodologies.Defined the test strategy for various phases for the IoT Platform project life cycle. Plax, my brainchild for automated testing: Conceptualized, provided architecture/design that mocks various interfaces (MQTT, HTTP, KDS, SNS) to test the new IoT platform, and can be used to mock any service (is available as open source now: GitHub - Comcast/plax: A test automation engine for messaging systems)Streamlined processes and lead by example to improve communication & collaboration through standardized documentation, Operational visibility in production and raised the quality of the project deliverables. Delivered IoT Platform to the two hundred employee trial before the General Availability of Home Sense/Smart Home Tab in XFi Mobile App.Comcast Xfinity IoT Adapters for Smart-home devices:End to end responsibility of IOT Service Layer, a REST API based application that serves Xfinity Home  Security, Smart home ecosystem in a key role. Interfaces with Rules Engine, iControl, software bridges (between Comcast and third-party clouds) to provide necessary IOT device control upon rule execution. Work involves architecture, design, implementation, optimization, performance, scalability, deployments and production support. Worked on this application for both sync and async versions (to handle events). Used Node.Js, Express.Js, Protobufs, Redis, Kafka, AWS SDK, HAL+JSON, OAuth2.0, Splunk, RESTFUL, github.Responsible for architecture/design & building Software bridges (adapters) to integrate Comcast Xfinity ecosystem with Philips Hue, Google Nest, August, Lutron, Lifx and Ecobee/Carrier thermostat IOT devices. Involves OAuth2.0, Node.Js. Express.js, Redis, MQTT, Splunk, Firebase, consul, github.Mentored, trained new Engineers at Comcast office in India to get them up to speed, technically managed the team for successful and timely delivery of the software bridges for the third party IoT Smart home devices.Sr. Software Consultant @ PayPal, San Jose, CA May 2014  Aug 2015Developed front-end UI in PayPal Optimizer chrome extension app, which allows merchants to scan and optimize their websites. The tool recommends best practices to improve the customer conversion rate. Used Backbone.js, JavaScript, HTML, CSS, Google analytics, Java backend.Developer in Wyndham-PayPal integration project to allow Wyndham customers to automatically check-in to the resort using PayPal beacon. Developed web page for users to download iOS application, and mobile web pages within iOS App. Used Backbone.js, JavaScript, HTML5, CSS3, Java Spring MVC.Lead developer in PayPal demo portal (https://demo.paypal.com) application. Re-architecture and redesign of Kraken/node.js application to showcase PayPal product capabilities using sample merchant types, multiple countries/locales based on their location/preference. Built customization of the user experience using a mega menu. PayPal users can create/save/experience profiles (saved in MongoDB) with these customizations. Used Kraken.JS, Node.js, Express.js, dust.js, grunt, LESS/CSS, Python, Google Analytics.Developed the FPTI (Web analytics) client tracking using PayPal Analytics, User Interface (HTML5, CSS3/LESS, backbone.js, JavaScript on the Merchant Activation Mini button factory node.js application in a KrakenJS 1.0 framework.Sr. Software Consultant @ Voice Carrier, San Jose, CA Aug 2012  May 2014Developing front end (HTML 5, CSS 3, JQuery, AJAX) for operator panel telephony application, which lets the front office receptionist to take WebRTC Video/Voice calls as well as PSTN calls. The application allows instant messaging among co-workers.Developed Software infrastructure in (Node.js, Express.js, Mongodb, HTML5, JQuery) to configure, auto provision Polycom, Panasonic & Yealink VoIP phones on HTTP/HTTPS connections from remote location. Service provider would be able to enter phone numbers, configuration in one web portal and phones from remote location would auto provision themselves given the URL of provisioning server.Developed network analytics application in a Hadoop infrastructure to monitor data center servers to analyze various operational issues such as: SIP attacks, Call quality issues, Call drops, one way audio issues, NAT/Firewall issues and network behavior.Exceptional troubleshooter/debugger of end-to-end scenarios. Simulated field issues using sipp, sipvicious tools.Deployed Optimized Asterisk/FreePBX/MYSQL template in the OpenVZ based cloud environment, Performance and Scalability tests. Python Automation scripts to globally monitor & modify all customer PBXs.Provided network architecture for the data center deployment to securely manage VoIP servers. Interoperability Certification process with SIP trunking providers: Avaya Devconnect, NEC, Panasonic & Mitel SIP trunking.Sr. Software Consultant @ Cisco Systems, San Jose, CA Dec 2011  Aug 2012Redesigned, developed C++ module to change main and presentation video codec negotiation logic based on the H.264 video codec properties, added signaling support for main-profile video, presentation resolutions for VGA and SVGA.End-to-End analysis/debugging of native interoperability (SIP/BFCP) scenarios in Telepresence (Cisco CTS + IP-Phone)  Cisco CUCM  Tandberg VCS  (Tandberg, Polycom, Lifesize endpoints) for all call features such as Hold/Resume, Audio Add-in conference, Presentation (shared screen, Switched). Responsible for Administration of Cisco/Tandberg/Polycom/Lifesize telepresence endpoints, MCUs, CTMS.Engineering Manager / Staff Engineer @ Juniper Networks, Bangalore April 2008  June 2010Managed VoIP software Architecture/design for the SRX branch router series based on Asterisk Open-source PBX. Development of logic/software to detect failures over all layers of TCP/IP stack for immediate fail-over to make survivable media gateway product (SRX branch router series) highly available.Added TCP and SSL/TLS, certification management to the Asterisk open-source PBX business edition. Addressed interoperability issues with OpenSIPs, Kamailio, Microsoft OCS, and Avaya SES for SIP.Project Leader, Engineering Manager @ Intoto Software Pvt Ltd, Hyderabad Dec 2002  July 2006Managed VoIP ATA product development/architecture, along two other router software projects. Mentoring people, project planning, management, architecture, design, implementation, testing, responsibility of quality and timely delivery.Product management and System Integration to make Residential Gateway Products (RGS Plus, ProV). Integration of SIP based VoIP, Wi-Fi, Intotos firewall and VPN, Net applications (DNS, DHCP, NTP), Remote Access, multicasting (IGMP), NAT, ALG, IDP. Simplified Web-interface keeping end-user in mind. Participated in pre-sales/customer demos.Clean, modular architecture for VoIP ATA product to interface phones, Hardware Adaption Layer, service layer, call-control layer and SIP protocol stack, with CLI, HTTP management interfaces. Built product based on Intels IXP425 Coyote platform, that was deployed in Netgear ATA for AT&T callvantage.Re-architecture, design, implementation of SIP, RTP/RTCP, SRTP protocol stacks.Addressed Organizational process issues: automated coding guidelines for easy adoption, doxygen for auto generation of documents from the code. Successfully made Intoto use these tools across all their products.Software Engineer @ Cisco Systems, Research Triangle Park, NC April 2000  July 2002Designed/implemented highly optimized SIP parser, for industry High-performance SIP Proxy server (C++ generic programming).Developed high-performance multi-threaded sniffer, software drivers to find performance numbers for the SIP Proxy server.Architecture/Design a scalable Network security solution to configure IPsec keys using IKE, Kerberos V5 on Cisco SIP Proxy Servers. Proven interoperability of IPsec, IKE security implementation of Cisco routers with other operating systems: Solaris 8, Linux FreeSWAN for the first time in Industry. Improved SIP Registrar performance using data structures/algorithms such as skip-lists, hash functions. Participated in 65th SIPit interoperability event.