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Haris Ullah Khan

@harisullahkhan

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Full Stack AI Engineer building scalable web apps and real-time voice/chat AI agent platforms.

Pakistan

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What I'm looking for

I’m looking to build production-grade voice + chat AI agents and durable workflow orchestration end to end. I want to ship real user impact for fintech/AI products, collaborate with strong engineers, and grow systems that measure clear ROI.

I’m a results-driven Full Stack AI Engineer with 5+ years of experience building scalable web applications, real-time AI agent platforms, voice AI systems, and complex AI workflows. I design end-to-end AI products—from customer-facing SaaS dashboards to durable workflow orchestration, realtime voice agents, and LLM integrations.

In my current role, I architected and built core components of UseCortana’s SaaS for configuring and deploying AI agents (“AI employees”). I delivered a production Voice & Messages Agents system using LiveKit Agents, and I built agentkong-stack to orchestrate durable workflows with Temporal plus vector memory and multi-LLM routing (OpenAI, Anthropic, Google via Vercel AI SDK).

I’ve also led end-to-end development of conversational AI platforms at VoiceCake.io and built fintech and operational dashboards at FireDev LLC. Earlier, I performed RLHF work to improve large language model responses, and as a Senior Full Stack Developer I led SDLC delivery and mentored junior developers while building full-stack applications with Angular, TypeScript, Python, and AWS.

Experience

Work history, roles, and key accomplishments

Current

Full Stack AI Developer

Current

Usecortana

Sep 2025 - Present (9 months)

Architected and built core components of UseCortana, a SaaS platform for configuring and deploying AI agents with automation, integrations, and analytics. Developed a production voice and messages agent system using LiveKit and multiple STT/TTS providers, plus durable workflow orchestration with Temporal and multi-LLM routing.

Next.js TypeScript fastAPI Temporal LiveKit WebSockets Vector Databases Vercel AI SDK Twilio Deepgram ElevenLabs Prisma Redis TRPC

Full Stack Developer

Brisbane Gateway Resort

Mar 2025 - Sep 2025 (6 months)

Developed an agentic AI chatbot for resort bookings and guest interactions, similar to an AI-powered Airbnb experience. Integrated conversational flows with booking systems to support guest engagement.

Agentic AI Booking System Integration Guest Interaction Automation API Integration Full Stack Web Development Web UI Development Debugging

Full Stack Developer

Voicecake.io

Jan 2025 - Sep 2025 (8 months)

Led end-to-end development of VoiceCake.io, a conversational AI platform supporting voice and chat agents across phone, web, WhatsApp, SMS, and email. Built core capabilities including an agent studio, automation features, dashboards, call logs, voice cloning, inference testing, CRM integrations, and API infrastructure.

Voice Cloning CRM Integration Dashboards

Full Stack Developer

Firedev LLC

Jun 2024 - Jan 2025 (7 months)

Designed and developed a secure internal dashboard for stablecoin operations with real-time monitoring, transaction management, minting/burning, and audit/compliance tooling. Built the official marketing website for USDvt with emphasis on regulatory compliance and multi-chain capabilities using Next.js/React.

Next.js Secure Web Dashboards Monitoring API Integration Web Application Security

RLHF Engineer

Turing

Jan 2024 - Jun 2024 (5 months)

Performed Reinforcement Learning from Human Feedback (RLHF) to train and fine-tune large language models, improving Google Gemini responses. Validated and optimized large-scale codebases and built test cases to improve model reliability and performance.

LLM Fine tuning Reinforcement Learning Model Evaluation Test Case Development Google Gemini Performance Optimization

Full Stack Developer

Abc Programmers

May 2023 - Jan 2024 (8 months)

Developed interactive UIs for major clients including Toyota and Lexus, integrating complex APIs to enhance system behavior. Performed debugging and work to improve performance and system stability.

API Integration Debugging Performance Optimization Troubleshooting

Full Stack Developer

Sumitomo Mitsui Banking Corporation

Feb 2023 - May 2023 (3 months)

Modernized a legacy loan application by redesigning the UI and integrating APIs to improve workflows and data management. Focused on improving usability and end-to-end processing through updated interfaces and backend connectivity.

Legacy Applications API Integration Data Management Web Development Workflow Optimization

Senior Full Stack Developer

Stampa Solutions

May 2021 - Feb 2023 (1 year 9 months)

Led a team of developers through the full SDLC for multiple web and mobile applications, improving documentation and code quality standards. Built and maintained full-stack applications using Angular, TypeScript, and Python, leveraging AWS services such as DynamoDB and S3 and optimizing database structures for performance.