# Abdulkareem Siddiq

> Principal Engineer LoopUp

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/abdulkareem

What can we build that has not been built by anyone else?

I design and build high-performance, scalable socket-based servers: SIP Proxy, Application Servers (custom protocols) using C++ on Windows platforms.
Over the past decade, I've designed and built:
A rating engine (C#)
A notifications engine (C#)
A SIP redirect proxy (C++)
A SIP Application Server (C++)
In-memory object-based caching service (C++)
Designed and built multi-threaded libraries to communicate with application server for Blackberry, Windows CE and the Windows desktop clients.

I can take your business idea and DELIVER a scalable solution FAST, EFFICIENTLY and with a SMALL team.

Checkout https://github.com/SiddiqSoft for some possibly useful C++ code.

## Work Experience
### Principal Engineer @ LoopUp
Jan 2003 – Present | San Francisco Bay Area
Guide the various groups on overall solution architecture.
Design the telephony architecture and the realtime routing systems.

### C++ Developer @ Siddiq Software
Jan 2019 – Present | California, United States

### Chief Architect/Lead Engineer @ Pagoo
Jan 2001 – Jan 2002 | Dublin, CA
	Designed the core framework used by engineering to develop the residential VOIP software solution: a distributed soft switch scalable from hundreds to millions of subscribers.
	Designed the framework metadata and SQL Server database.
	Coded substantial portion of the residential software solution.
	Designed the XML provisioning API as part of a Joint Development Agreement with Cisco.
	Maintained the core framework and architecture roadmap while working with product development to manage MRD, PRD and SRD.
	Responsible for guiding the development of the OSS, Protocol Subsystem and the Core Application System.
	Made solution and best practice recommendations. Directed the choice of tools and technologies for product development, for example Rational Rose.
	Researched and delivered prototypes for emerging VOIP technologies in conjunction with the Pagoo Strategic Technology Center, for example a SIP-based solution.
	Additional responsibilities included making presentations to key customers, technology partners as well as preparing technical documentation to support marketing with sales effort in China and Europe.
	Supervised and mentored junior engineers.
	Managed the full product lifecycle of the Pagoo Residential soft switch solution.

I met some of the most dependable, smart people in my life at this company!

### Lead Engineer @ Pagoo, Inc.
Jan 1999 – Jan 2001 | San Francisco, CA
	Coded substantial portion of the ICW and IPN systems.
	Designed the Pagoo Internet Call Waiting Application Server.
	Designed the Pagoo Internet Phone Number system.
	Managed multiple projects with tight delivery timelines. This included project planning, tracking and resource allocation.
	Managed the full lifecycle of the Pagoo IPN™ and Pagoo-Tiscali Voispring™ product.

### Software Engineer @ Octane Software
Jan 1998 – Jan 1999 | San Mateo
	Designed the core meta-data driven event handling application server.
	Designed the Telephony Rendering subsystem for the Octane Business Transaction Server.
	Interfaced with CTI solution providers as well as technology partners.
	Assisted the product development manager with defining the Telephone Rendering Engine as it related to Call Centers and other CTI partners.
	Managed the lifecycle of the Telephony Rendering subsystem.

### Principal @ Self-Employed Consultant
Jan 1998 – Jan 1998 | Concord, CA
One cannot stop building!
I spend my time learning skills around telephony. Something that would help out in my future.

	Consulting and contract programmer.
	Designed CTI software for employment agency.
	Manufactured voice intercept software for small businesses (Call Logging System.)
	Developed ActiveX controls for Music Telecom voice boards.

### Software Engineer @ Global Communications Solutions
Jan 1997 – Jan 1998 | Oakland
	Developed IVR products for OEM sales in South America.
	Responsible for bidding contracts to customers.
	Developed CT and IVR software for Music Telecom (NewVoice), Rhetorex and Dialogic boards under Windows NT.
	Designed TCP-based client-server CT architecture for Axis NT: “NIPC.” Environment: Windows NT
	Managed support calls, field support and product assembly.

### Junior Software Developer Assistant @ Atari Corporation
Jan 1992 – Jan 1993 | Sunnyvale, CA
Unpaid internship. A great learning experience. I'm proud to have been part (if not direct) of the golden-era of Computing.

	Wrote tools for developers.
	Assisted the Developer Relations Department with sample programs.
	Document development toolkits.
	Beta-testing Atari tools.

### Floor Sweeper or whatever else they called us @ McDonald's Corporation
Jan 1989 – Jan 1989 | Sun Valley Mall, Concord, CA
My first job at high-school!
I'm proud of McDonald's as my first paying job in the US!

Why?
Needed the cash to buy my first computer

What?
I was asked to keep the floors clean and wipe off the tables.

Skills gained:
There is no such thing as a job beneath you. I learnt humility and hard-work.


## Contact & Social
- LinkedIn: https://linkedin.com/in/abdulkareem-siddiq
- Portfolio: http://www.loopup.com
- GitHub: https://github.com/abdulkareem-siddiq
- GitHub: https://github.com/siddiqsoft

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Source: https://flows.cv/abdulkareem
JSON Resume: https://flows.cv/abdulkareem/resume.json
Last updated: 2026-04-10