SUMMARY:

• Extensive hands - on experience in full stack, full cycle, N-tiered applications with SQL / NoSQL Server backend, mobile apps, websites, web applications, middleware and software as a service, starting from feasibility, specification, design, coding, testing, documentation and deployment.
• Developing stand alone and N Tier GUI applications, Windows Services, DLLs, automation tools using VB6, VB.NET, C/C++, C#, Powershell scripts and Microsoft .Net framework.
• Skilled in writing automation tools and scripts to support development productivity.
• Developing web apps and websites using HTML5, ASP, Node.JS, PHP and AngularJS.
• Developing embedded systems, IoT devices and sensor network gateways using, cooperative and preemptive multithreaded / multitasking OS / RTOS using GNU and proprietary toolchains.
• Connecting IoT devices and remote sensor modules to the Cloud ( Google, PARSE, Azure ) and to a embedded hub using BLE, WiFi links and messaging protocol like AMQP, MQTT and, XMP.
• Integrate 3rd party, open source technologies like XML, JSON data sources, Messaging protocols XMPP, MQTT, AMQP and RabbitMQ, Pub/Sub broker/queue and creating, consuming REST API
• Develop in C and assembly SDKs, API, DLLs, TSRs, serial port redirectors and filter drivers.
• Profiling, low-level Debugging and testing skills using GNU and Visual Studio debugger..
• Developed wide range of applications, from accounting systems to instrumentation, control, telecommunications, data communication, wireless, environmental and life sciences.
• Building Linux / Windows server platforms from motherboard, CPU and cooling system to configuring RAID drives, Network, Graphics & GPU board setup and Server / OS configuration.
• Embedded hardware design, including working with 6051, x86, ARM based microprocessor and microcontrollers using GNU and commercial toolchains and in the use of circuit level test tools like oscilloscopes, logic analyzers, signal generators, spectrum analyzers, multi-meters etc.
• Team player with excellent interpersonal, analytical, presentation skills and highly scalable in managing multiple assignments at a time.

TECHNICAL SKILLS:

• C/C++, C#, BASIC / VB (with OOP), Lisp, Prolog.
• Assembly language for 8051, 6809, 68k, ARM and Intel / AMD x86 both 32 and 64 bit systems.
• Javascript, Python, PHP, Perl, ASP, ColdFusion, SQL, NoSQL, .NET, RAD and CASE tools.
• TCP/IP application layer protocol and services (ARP, DNS, DHCP, BOOTP, HTTP, SMTP, FTP, MQTT, TELNET, POP3, IMAP, SNMP agent and trap with standard and proprietary MIBs)
• ATM switches and Voice over Frame Relay (VoFR), T1 and Fractional T1 routers, CSU / DSU, base-band / ISDN modems, time division (TDM) / statistical multiplexers and protocol converters.
• Telecom and VoIP protocols ( SS7, SIP, H323) and MPLS, TDMA, CDMA, GSM, LTE networks.
• SWIFT and X.25 protocol and links for electronic banking data exchange.
• Desktop GUI / Enterprise stand-alone / client-server application integrating with MS SQL / MySQL, SQLite, Access database backend and NoSQL, Big-Data and Cloud data sources.
• APIs, Device Drivers, TSRs, COM, ActiveX, DLL, DDE client / server and class wrappe
• Web Portals, Interfaces and eCommerce websites using HTML, XML, CGI, DHTML, Javascript, VBscript HTML5, ASP.NET, PHP, ColdFusion and other server side markup languages.
• Computer Telephony Integration (CTI) platforms including Soft Switch, PBX, IVR, ACD, VoIP (SIP, H323) switch gateways, Auto-attendant, Unified Messaging, Call Accounting and Billing systems.
• Embedded, web enabled device server for rack environment and equipment closet monitoring.
• Maintenance Management client server application with MySQL backend and integrated web portal for ticketing, tracking support request and job status and for scheduling work orders and, job assignments to field technicians. Application also included a real time job status dashboard.
• Voice / data ( VoIP, POTS ) communication, conversion (DAC, ADC) and monitoring applications.
• Embedded systems including Windows CE with .NET Compact Framework, Linux, DOS & RTOS.
• Embedded, GPIO, Active Directory/LDAP, SNMP and Sensor Array server using RTOS / Linux
• Writing Requirement, Design and User documents, RFP, RFQ, RFI and scope of work.
• Accounting system including GL / AP / AR modules for Windows environment and IBM midrange S/36 and AS/400 midrange environment using PDM, SEU, DFU and S/36 Basic.
• Microsoft Projects (CPM / PERT) for resource scheduling and subcontractor project management
• Developing, deploying applications and services to private / public Cloud ( EC2, Google, Azure )
• Building high-end multi-processor Windows, Linux, MAC servers including, installation, repair and replacement of internal and external components—motherboards, processors, memory, network interfaces, multi media cards, modems, hard drives, floppy drives, CD/DVD, SCSI, RAID drives.
• Planning, ordering and supervising all support and maintenance work on system starting from midrange systems (SNA/SDLC, NT, UNIX) to servers, desktop and embedded devices and PBXs.
• Installing and Configuring Windows Server 2008 / 2012 R2, as Storage Server, Domain Controller including Active Directory Domain Services, group policy, LDAP, Kerberos/NTLM authentication
• Plan and setup of complex LAN, WAN, VPN and voice / data networks, including cable layout, network security, Disaster recovery and Continuity, need assessment and RFQ / RFP generation.
• Configuring, installing IBM S/36, AS/400 system and SNA / SDLC controllers and 5250 devices.

PROFESSIONAL EXPERIENCE:

Confidential

IT Director and Senior Developer

• Managed IT infrastructure including building and configuring Windows Server 2008 / 2012, managed routers, switches, gateways, firewalls, UPS es, NAS devices and other IT assets.
• Developed applications for productivity, network monitoring, data capture and conversion.
• Built an N-tiered maintenance management, ticketing and work scheduling system with a SQL backend including a status dashboard and a web portal for client access and monitoring.
• Wrote set of tools to capture remote XML log output from Gilbarco POS. Thee were based on a SOA design that included several individual, autonomous Windows Service implementing a micro service architecture using RabbitMQ for the message queue and MassTransit as the service bus to monitor, capture, parse and report error status based on the error level so that the backend Price Book data delivery is corrected in due time. The Windows Service modules were written in .NET using the C# language.
• Developed Pricebook, a client server based, retail price management system including the store backend component to access SQL data and convert to XML for consumption at the POS end.
• Maintained, upgraded and converted critical legacy applications and systems.
• Planned and managed disaster recovery, business continuity and backup strategies.

Confidential

Development Consultant and Software developer

• HIPAA compliant Home Health Care Management, Billing and Document Management applications including logging of health-care provider visits via an IVR into MySQL database.
• CTI / IVR based Time-Clock application supporting daily attendance report, timesheet and payroll.
• WYSIWYG Web page designer with built in HTML,CSS, ASP, javascript, PHP and Image editor.
• Wireless enabled, web interfaced embedded sensor hub for monitoring vitals signs like pulse / O2 meter, blood pressure, lungs throughput and weight for use in postoperative patient care.
• Embedded Environment Monitoring Server using threaded Real-Time OS implementing a sensor hub supporting RS-232C/485/422, SPI, I2C, GPIO, Ethernet, RIP, NAT, RDP and SIP protocol.
• Embedded Web Enabled device for out of band monitoring and rebooting / restarting of remote device, server, application and services including functions such as heartbeat monitoring.
• Developed SDK, API, DLL, ActiveX, COM TSR, serial port redirector and Windows filter drivers.
• USB server and clients including USB to TTL/Serial/Parallel converter and USB HID driver.
• Embedded system interface hardware modules for GPS, I2C, SPI, RS-232/244/485, USB, GPIO and other synchronous / asynchronous and high speed serial links.

Confidential

Lead Technical Architect

• Architected carrier-grade (Class 4/5) switching, unified messaging, billing VoIP gateway and VoiceXML server platform including Voice Browser and other intelligent network (IN) sub systems.
• Worked with marketing transforming client requirements and conceptual models into plans, processes and solution starting from providing hardware, software and integration specification all the way to pilot implementations for telcos customers.
• Architected the protocol layers for integrating, interlinking sub-systems like Speech Recognition, SS7 (ISUP), Soft Switch, SMS, WAP, Location Based Service for Mobile Users, Text to Speech (TTS ) converter and CDR / Billing server and its C callable SQL stored program wrapper APIs.
• Provided design decision, requirement analysis and scoping of various communication protocol layers and API implementation necessary to integrate different subsystem and modules.
• Designed Gateway and Proxy Servers to integrate Voice Portals with WAP, SMS service modules

Executive Director

Confidential

• Managing the day to day operation and maintenance of group’s total LAN/WAN, Windows NT4 Servers, Windows XP, IBM 5250 workstations, and telephone / PBX network infrastructures.
• Lead the steering committee of IT managers to strategize and implement an enterprise wide IP addressing and domain naming standard, mapping to existing PBX extension numbering scheme.
• Developed the group’s Disaster Management, Recovery and Business Continuity Plan that included widely distributed departmental and cross country installations of Frame Relay and VSAT connected networks environment, IBM mini AS/40 and MITEL Telecom /PBX installations.
• Directed the design and implementation of the Group’s various Web sites. Setup the Group’s first in-house NT 4 / 2000 based Windows Server, including configuring the DNS, proxies, remote access dial-in services (RAS), DHCP, various routers and NAT gateways and firewalls.
• Conceived and developed a range of communication and telephony products that attracted media attention at various international tradeshows. Trained and supervi­sed testers, field engineers and other technical / non-technical staff for the project. Managed the product’s total life cycle.
• Supervised installation of VSAT links, IP over Frame Relay Link deployment, point to point microwave and DSL link setup and network of Mitel SX2000 redundant processor PBXs.