Shujaat H.

I design and build software systems end to end: server, web front end, desktop client, and the integrations that tie them together. Over 25 years of development, including 16 years of freelancing (on Elance since 2010, then Upwork), I've learned that architecture decisions made in week one decide what a product costs to own in year five. I make those decisions deliberately, and then I write the code. Top Rated, $200K+ earned and 146 completed jobs on Upwork. Several of my client relationships have run for 5 to 8 years, which is the best evidence I can offer that the systems I build hold up. WHAT I BUILD AI-powered products • Real-time voice AI agents that answer business phone lines: SIP telephony (LiveKit, Kamailio), streaming speech-to-text with server-side voice activity detection, LLM reasoning, and low-latency text-to-speech (Cartesia, Rime). Includes natural interruption handling, per-business knowledge bases, concurrent multi-tenant calls, and an admin dashboard with call logs. • LLM integration with OpenAI, Google Gemini, Groq and locally hosted Llama models, for generation, extraction and automation on both server and client side. Multi-tier platforms • Edix.pk, a school management platform I architected and built: a Laravel + MySQL API, a Vue + TypeScript web app, and a companion WPF desktop app. It covers registration, attendance, fees, timetables, exams and staff. Microsoft Office solutions • Word, Excel, PowerPoint and Outlook add-ins in VSTO, Office.js and VBA, including VSTO-to-Office.js migrations. A Word add-in I built for a BIM document platform has been in daily production use since 2018. .NET desktop • WPF applications on modern .NET with MVVM and DI, hardware integration over serial/COM ports, real-time charting, and DirectX rendering. HOW I WORK • Architecture first: I lay out the structure, trade-offs and risks before writing code, so you make informed decisions. • Built to be owned: clean, documented, testable code that you or another developer can maintain. • Clear communication in fluent English, with regular progress updates. CORE STACK C#, .NET 8, WPF, ASP.NET Web API · PHP, Laravel, MySQL, SQL Server · Vue, TypeScript, Vuetify · Node.js · VSTO, Office.js, VBA · OpenAI, Gemini, Groq, LiveKit, SIP Also: WinForms, VB.NET, WCF and modernising legacy applications. If you need someone who can own the whole system, not just one layer of it, send me a message.