full stack ai developer

Haris UllahKhan

6+ years building scalable AI systems, voice agents, and SaaS platforms. Currently at UseCortana, freelancing for Metropolitan Insurance. Based in Lahore, Pakistan.

Chat with AI
6+
years exp
9+
companies
3
ai platforms built
∞
problems solved
Next.jsTypeScriptPythonVoice AITemporalLiveKitAI AgentsOpenAIRAGSaaSFull StackAWS
01

Introduction

A quick walkthrough of who I am, what I build, and how I work with teams - before the case studies and résumé below.

Haris Ullah KhanFull Stack AI Developer · Lahore, Pakistan
02

Experience

Sep 2025 – Present
UseCortana
Canada · Remote
Full Stack AI Developer
  • Built the multi-tenant agent studio frontend on Use Cortana (usecortana.ai) - drag-and-drop configuration for chat and voice agents, milestone vs single-note conversations, and channels across voice, SMS, email, WhatsApp, and embeddable web chat.
  • Shipped per-business knowledge bases with RAG (docs + conversation memory), custom/system tools, voice cloning or presets, and GoHighLevel CRM sync for multi-org / white-label-style workspaces.
  • Evolved production voice from a LiveKit STT-TTS-LLM cascade (ElevenLabs, Grok, and related providers) to Hume speech-to-speech to cut caller-facing latency, with Twilio inbound/outbound webhooks.
  • Wired call orchestration Frontend → Restack (Temporal-based) → Python backend for durable agent workflows - supporting 50+ deployed AI employees and 5,000+ monthly AI-driven phone calls with high uptime.
TemporalLiveKitPythonTwilioElevenLabsCRMWhatsApp
May 2026 – Present
Metropolitan Insurance
USA · Remote · Freelance
Full Stack Developer - Freelance Contractor
  • Built CarrierBridge from the ground up as the sole full-stack developer, working directly with a non-technical founder to translate a manual multi-carrier HO3 quoting workflow into an automated one.
  • Shipped Playwright browser automation across ~10 active carrier portals (Universal/Atlas, Slide, Florida Peninsula/Windward, Southern Oak, Security First, Home Owners of America, American Integrity, Heritage, AAA Carolinas, Orion180), with real-time quote progress streamed via Server-Sent Events and selective carrier retry.
  • Built RenewalSync (renewalsystemmetro.com) for auto-policy renewals: Progressive and National General Dec PDF pull, structured current-vs-renewal comparison, and automatic EZLynx activity + Document Library upload in one SSE pipeline.
  • Integrated BrightData and Zillow scraping (Realtor.com fallback) plus Google Places autocomplete so property details pre-fill instead of manual entry on every quote; Neon Auth teams/roles and quote history for multi-agent ops.
  • Deployed the automation layer on AWS EC2 behind a Cloudflare Tunnel with OpenVPN egress so carrier portals accept traffic instead of blocking datacenter IPs — Docker and GitHub Actions CI/CD for releases.
AWSGoogle
Jan 2025 – Sep 2025
VoiceCake.io
United Kingdom · Remote · Contract
Full Stack Developer
  • Built core VoiceCake.io platform infrastructure end to end: admin portal from the ground up and a full revamp of the user-facing UI.
  • Integrated multiple voice and telephony providers (LiveKit, Twilio, Deepgram, Hume, Cartesia, Hamsa) with voice cloning and inference testing so agents could be validated before go-live.
  • Shipped an embeddable web widget for on-site agent deployment, call logs with full transcripts for QA/compliance, CRM integrations for pipeline sync, API docs with a developer playground, and AI evaluation workflows.
LiveKitTwilioDeepgramCRM
Mar 2025 – Sep 2025
Brisbane Gateway Resort
Australia · Remote · Contract
Full Stack Developer
  • Designed and shipped dual text and voice AI booking agents for Brisbane Gateway Resort (brisbanegateway.com.au) - stay intake, accommodation options with in-chat property images, Newbook checkout links, OpenAI WebSocket voice, and RAG memory - reducing front-desk inquiry volume by ~30%.
  • Worked directly with non-technical operations stakeholders to map guest journeys and iterate from daily feedback - processing 500+ guest interactions monthly across chat and voice.
OpenAI
Jun 2024 – Jan 2025
FireDev LLC
USA · Remote
Full Stack Developer
  • Built a secure internal dashboard (React, Node.js) for stablecoin (USDvt) operations: real-time monitoring, transaction management, minting/burning workflows, audit logs, and compliance tools - tracking $2M+ in daily transactions.
  • Implemented security best practices (role-based permissions, encrypted storage, data sanitization, audit trails) in a regulated fintech environment, reducing manual compliance checks by 50%.
  • Developed a Vermont State Bank web application with secure enterprise API integrations and automated data validation, and delivered the USDvt marketing site (Next.js/React) for a successful token launch.
Next.jsReact
Jan 2024 – Jun 2024
Turing
USA · Remote
RLHF Engineer
  • Performed Reinforcement Learning from Human Feedback (RLHF) to fine-tune Google Gemini, evaluating and ranking 500+ model outputs weekly for response quality, safety, and factual accuracy.
  • Created test cases and evaluation frameworks for AI model reliability, building practical expertise in LLM output validation, edge-case detection, and systematic AI evaluation.
GoogleGeminiRLHF
May 2023 – Jan 2024
ABC Programmers
Jordan · Remote
Full Stack Developer
  • Developed interactive React UIs for Toyota and Lexus dealer portals, improving page load performance by 40% through code splitting, lazy loading, and caching strategies.
  • Integrated complex third-party APIs and systematically resolved 200+ production bugs, reducing client-reported issues by 60%.
ReactToyotaLexus
Feb 2023 – May 2023
Sumitomo Mitsui Banking Corporation
Japan · Remote · Contract
Full Stack Developer
  • Modernized a legacy loan application for a Fortune 500 bank - redesigned the UI, integrated APIs, optimized database queries, reducing loan processing time by 25%.
May 2021 – Feb 2023
Stampa Solutions
Lahore · On-site
Senior Full Stack Developer
  • Led a team of 6 developers through the complete SDLC for 8+ web and mobile applications, delivering all projects on time with <5% post-launch defect rate.
  • Mentored 4 junior developers, established documentation standards and code review practices adopted company-wide, improving team review throughput by 30%.
  • Built and maintained full-stack applications (Angular, TypeScript, Python, AWS DynamoDB/S3), optimizing database queries that reduced average API response times by 45%.
TypeScriptPythonAngularAWSDynamoDB
03

Skills

Frontend
Next.jsReactAngularTypeScriptJavaScriptHTML5CSS3Tailwind CSSRadix UI
Backend & languages
PythonFastAPINode.jsExpresstRPCRESTful APIsGraphQLWebSocketsWebhooks
AI & LLMs
OpenAI APIAnthropic APIGoogle LLMsVercel AI SDKPrompt engineeringRAGEmbeddingsFunction callingTool useAI evalsRLHFAgent orchestrationStructured extractionMCP
Voice AI
LiveKit AgentsTwilio PSTN/SIPDeepgram STTElevenLabs TTSHume EVIVoice cloningReal-time voice pipelinesLive call transfers
Databases & data
PostgreSQLMySQLRedisDynamoDBClickHousePrisma ORMPineconemem0
Infrastructure & delivery
AWS (S3, EC2, DynamoDB)DockerTemporalVercelCI/CDGitVitestObservability
04

Portfolio

Browse project decks three at a time. Each card uses page one of the PDF as the cover.

RenewalSync cover for auto policy renewal automation with Progressive, National General, and EZLynxCase study
Case study

RenewalSync — Auto Policy Renewal Automation

Built RenewalSync for Metropolitan Insurance as the auto-renewal companion to CarrierBridge. Agents enter a Progressive or National General policy number; Playwright pulls current and renewal Dec PDFs, compares drivers/vehicles/coverage/premiums, then automatically posts an EZLynx activity with Document Library upload — credentials stay on the API. Live at renewalsystemmetro.com (Vercel FE + EC2 Playwright API behind Cloudflare Tunnel).

Next.js 15React 19TypeScriptFastAPIPlaywrightSSE
Visit RenewalSync — Auto Policy Renewal AutomationRead RenewalSync — Auto Policy Renewal Automation case study
Portfolio deck

CarrierBridge — Multi-Carrier Insurance Quoting

Built CarrierBridge as sole full-stack developer for Metropolitan Insurance. Google Places address intake, BrightData/Zillow property pre-fill (Realtor.com fallback), then parallel Playwright quoting across ~10 HO3 portals (Universal/Atlas, Slide, Florida Peninsula/Windward, Southern Oak, Security First, HOA, American Integrity, Heritage, AAA Carolinas, Orion180) with SSE progress, selective retry, and Neon Auth teams/history. Deployed on AWS EC2 behind Cloudflare Tunnel + OpenVPN.

Next.js 15React 19TypeScriptFastAPISQLAlchemyNeon Postgres
Visit CarrierBridge — Multi-Carrier Insurance QuotingRead CarrierBridge — Multi-Carrier Insurance Quoting case study
Portfolio deck

AI Voice & Chat Automation Platform

Full-stack work on VoiceCake.io — a conversational AI platform for human-sounding voice and chat agents across phone, web, WhatsApp, SMS, and email. I built the admin portal from scratch, revamped the user-facing UI, integrated LiveKit, Twilio, Deepgram, Hume, Cartesia, and Hamsa, and shipped voice cloning, inference testing, an embeddable web widget, call logs with full transcripts, CRM sync, API docs with a developer playground, and AI evaluation workflows.

Next.jsReactFastAPILangChainMCPLiveKit
Visit AI Voice & Chat Automation PlatformRead AI Voice & Chat Automation Platform case study
Portfolio deck

Badie Alliance Tax Service — CRM & Client Portal Platform

Full CRM for Badie Alliance Tax Service replacing their Wix site and spreadsheet workflow. Smart quote tool, secure client and EFIN portals, real-time refund tracking, staff dashboard with Kanban, performance reporting, and CSV/PDF export — with lead management, user roles, and automations across 50 states at a 97% success rate.

Next.jsReactDjangoPythonREST APIsVercel
Read Badie Alliance Tax Service — CRM & Client Portal Platform case study
Portfolio deck

USDvt Web Application

Developed the USDvt web application, a secure and intuitive platform for managing stablecoin operations. The application features a real-time dashboard for monitoring coin statuses, transactions, system health, and pending approvals. It includes dedicated modules for transactions, users, partners, policies, reports, and audit logs, as well as secure token management modals for minting, burning, and transferring coins. Built with a focus on performance, usability, and compliance, the platform streamlines internal workflows while ensuring transparency and regulatory alignment.

Next.jsReactFlaskPythonREST APIFintech
Read USDvt Web Application case study
Portfolio deck

LassWHO Web Application

Developed LassWHO, an interactive platform enabling users to book live video chats with inspirational hero speakers from around the world. The platform connects users directly with experts in leadership, resilience, motivation, and overcoming adversity. It features a smooth booking process, a user-friendly dashboard for managing sessions, and secure video integration for real-time conversations. The solution was designed with scalability, performance, and an engaging user experience in mind.

Next.jsReactExpress.jsMongoDBStripeVideo Booking
Read LassWHO Web Application case study
Portfolio deck

AI Calling Agent for HVAC Industry

For Lehigh HVAC I built a custom internal CRM - customer management, job/service tracking, follow-ups, campaign lists, and call outcomes from AI agents - as the system of record for inbound and outbound ops. Retell AI front-desk agents handle scheduling, FAQs, intake, and urgent escalations; outbound Retell campaigns pitched duct cleaning to existing customers and pushed leads back into the CRM. Make.com orchestration; ~20% higher satisfaction on voice work.

Retell AICustom CRMMake.comVoice AIElevenLabsHVAC
Read AI Calling Agent for HVAC Industry case study
Real Estate Lead Sites & Retell Agents portfolio deck coverCase study
Case study

Real Estate Lead Sites & Retell Agents

Built lead-generation websites for realtors and real estate companies on GoHighLevel, WordPress, Carrot, and custom stacks. Wired Zapier so form fills create proper leads in GHL or eSimply, then Retell AI voice agents for speed-to-lead follow-up - preferred because agents can edit scripts and hours after launch.

GoHighLevelWordPressCarrotZapierRetell AILead Gen
Read Real Estate Lead Sites & Retell Agents case study
Portfolio deck

Comcat AI

AI product build documented in the Comcat portfolio deck.

Next.jsAI ChatbotLLMProductFull Stack
Portfolio deck

EStaff Hub

Staff and workforce hub platform - portfolio case study deck.

Next.jsSaaSWorkforce HubDashboardTypeScript
Portfolio deck

John Barber

Client web project for John Barber - portfolio deck.

Next.jsClient ProjectWeb DesignResponsive UI
Portfolio deck

Tax Advance Website

Marketing and lead site for Badie Alliance Tax Service, paired with the Badie Alliance Tax CRM build.

Next.jsVercelLead GenTax ServicesMarketing Site
Portfolio deck

USDvt Website

Public marketing site for the USDvt stablecoin platform.

Next.jsVercelWeb3StablecoinMarketing Site
Visit USDvt Website
01 / 01
05

Services

01
Full-stack development

Next.js and React UIs, APIs, auth, and production deploys.

Product
View Full-stack development
02
Website development

WordPress, Shopify, Carrot, GHL, or custom Next.js/React.

Sites
View Website development
03
CRM development

Custom pipelines, portals, and tools that replace spreadsheets.

Operations
View CRM development
04
Automation & integrations

Make, Zapier, portal automation, and Retell help-desk agents.

Ops
View Automation & integrations
05
Backend development

Python/Node APIs, data, workflows, and cloud infrastructure.

Systems
View Backend development
06
Agentic AI

LLM apps, RAG, tool-use agents, and evaluation loops.

AI
View Agentic AI
07
Voice AI

Calling agents, LiveKit streaming, and telephony pipelines.

Voice
View Voice AI
08
Consultation

Architecture, vendor choice, and a written plan to ship.

Advisory
View Consultation
06

Why hire me

Remote is only a compromise when it's done badly. Here's what actually changes when I join your team - including the part about money.

Timezone

I work your hours, not mine

I'm based in Lahore, Pakistan (UTC+5) and build my day around your team - early starts for APAC, full days alongside Europe, evening blocks that cover US mornings. Standups, reviews, and production issues get handled live instead of on a 12-hour delay.

Cost

Senior output without local overhead

At $20.00/hr you pay for work, not overhead - no recruiter fee, no benefits or payroll tax, no equipment budget, no paid bench time. Roughly what a local mid-level hire costs, for a senior engineer who ships end to end.

Quality

Marginal rates, exceptional work

The rate is competitive on purpose; the work isn't discounted. Everything in the projects above is running in production right now - voice agents answering live calls, insurance workflows automated across carrier portals, platforms that businesses run their day on.

Scope

One hire, the whole stack

Next.js and React on the front, Python and Node on the back, AWS underneath, and the AI layer on top. No handoffs between three specialists and no coordination tax - features go from idea to deployed without waiting on anyone else.

Communication

Remote-first for 6+ years

I've delivered for teams across the US, UK, Canada, Australia, Japan, and the Middle East. Written updates, clear scope, and plain-English conversations with non-technical stakeholders - you always know what shipped, what's next, and what's blocked.

Risk

Easy to start, easy to stop

Start with a paid trial task or a two-week scoped sprint. No long contract, no notice period, no severance - if the work isn't what I promised, you stop. In practice, engagements get extended instead.

When I'm online

Typical shifts in your local time - not a hard limit. Tell me the window your team or you need and I'll be in it.

US Pacific07:00 – 13:00 PT
US Eastern10:00 – 16:00 ET
UK & Europe09:00 – 17:00 CET
Gulf & KSAFull workday AST
Australia & Japan11:00 – 19:00 AEST
07

FAQ

Quick answers on full-stack, automation, CRMs, websites, voice AI, and how to hire.

Who is Haris Ullah Khan?

Haris Ullah Khan is a Full Stack AI Developer with 6+ years of experience shipping full-stack products, business automation, CRMs, websites, and production voice AI. Based in Lahore, Pakistan, working remotely with teams in the US, UK, Canada, Australia, and the Middle East.

What kind of work can I hire Haris for?

Full-stack SaaS (Use Cortana, VoiceCake), insurance quoting and renewal automation (CarrierBridge + RenewalSync), CRM builds (Badie Alliance Tax Service, Lehigh HVAC), Retell AI + Make/Zapier help-desk agents, websites (WordPress, Shopify, Carrot, GoHighLevel, or custom Next.js/React), and agentic voice AI. Typical rate is $20.00/hr.

Do you only do voice AI?

No. Voice AI is a specialty, not the whole practice. Day-to-day work also includes full-stack product development, vibe coding setups (Claude for architecture/sprints + Cursor for implementation), carrier/portal automation, CRM systems, no-code orchestration (Make, Zapier), and marketing or lead sites.

Can you automate insurance or ops workflows?

Yes. For Metropolitan Insurance I built CarrierBridge (Google Places + BrightData/Zillow prefill, parallel Playwright across ~10 HO3 portals with SSE progress, Neon Auth teams/history) and RenewalSync (Progressive/National General Dec pull, structured compare, auto EZLynx on renewalsystemmetro.com). Same EC2 + Cloudflare Tunnel + OpenVPN pattern keeps carrier portals accepting automation traffic. Similar approaches apply to other ops-heavy businesses.

Do you build CRMs and help-desk voice agents?

Yes. For Badie Alliance Tax Service I built a full CRM with client and EFIN portals, smart quoting, real-time refund tracking, and staff Kanban across 50 states. For Lehigh HVAC I built a custom CRM (customers, jobs, follow-ups, campaign lists, call outcomes) as the system of record, plus Retell front-desk agents and outbound duct-cleaning campaigns - all writing back to the same CRM via Make.com.

Can you build or rebuild my website?

Yes - WordPress, Shopify, Carrot, GoHighLevel, or custom Next.js/React. Realtor and home-services lead sites are common: forms → Zapier → CRM, optional Retell follow-up. For product companies I build full custom apps on Next.js, TypeScript, Python, and FastAPI (Use Cortana, VoiceCake).

Chained voice pipeline or speech-to-speech - which do you build?

Both when voice is in scope. Speech-to-speech (Hume, Cartesia, Grok Voice) is more latency-friendly; tooling and MCP are harder. A chained STT→LLM→TTS pipeline gives more control per layer and stronger tool wiring, but needs fine-tuning at each stage. Clone my open-source LiveKit cascade demo (Deepgram + OpenAI + ElevenLabs) at /blog/open-source-livekit-chained-voice-pipeline-demo.

Does Haris work with US and UK timezones?

UTC+5 (Lahore) with overlap for US, UK/Europe, Gulf, and APAC. Standups, reviews, and production support are scheduled to overlap with client teams in North America, Europe, Gulf, and APAC.

How do I get started?

Book a free 30-minute call via the contact section, or send a short brief through the message form. Share whether you need a website, CRM, automation, full-stack product, or voice agent - I'll propose a clear next step. Typical rate is $20.00/hr.

08

Work together

Open to full-time, contract, and consulting - let's talk about your product, team, or next AI build.

Video call

Book a free call

30-minute intro - discuss scope, timeline, and how I can help. No pressure, no commitment.

Message

Send a brief

Share project details, budget, or questions - I'll reply within 1–2 business days.

09

Chat

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Haris
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Hi - I'm Haris. Add your name and best email or phone below to get started.