Muhammad Hasan Nazir
Verified Expert in Engineering
Software Engineer and Developer
Lahore, Punjab, Pakistan
Toptal member since May 18, 2026
Muhammad is a senior full-stack AI engineer building production products across TypeScript/Next.js and Python/FastAPI/Django. His recent work includes agentic benchmark infrastructure for frontier models, RAG and multi-agent systems, and AI products across healthcare, HR, LegalTech, and SaaS. He works across the full path from product and architecture decisions to APIs, data, AI workflows, infrastructure, and production UI.
Portfolio
Experience
- Node.js - 8 years
- TypeScript - 7 years
- React - 6 years
- Python - 6 years
- Next.js - 5 years
- Django - 5 years
- Artificial Intelligence (AI) - 4 years
- FastAPI - 4 years
Preferred Environment
Visual Studio Code (VS Code), GitHub, Visual Studio, Linux, Amazon Web Services (AWS), React, Django, Node.js, Terminal, PostgreSQL
The most amazing...
...thing I built: Human Union Inc.'s agentic benchmark infrastructure with frontier AI researchers, task generation, oracle runs, sandboxed evals, and AI budgets.
Work Experience
AI Annotator and Full-stack Engineer
Human Union Data Inc.
- Built agentic infrastructure for Human Union covering benchmark task generation, refinement, oracle runs, sandboxed execution, model trials, and reviewer submission.
- Designed terminal-based benchmark tasks with isolated Docker environments, task specs, oracle solutions, and automated verifiers for repeatable evaluation.
- Built sandboxing and guardrails that restricted tools, files, runtime access, and hidden reference data so agents had to solve tasks within the intended constraints.
- Calibrated task difficulty against models such as GPT-5.4 Codex and Claude Opus 4.6, using repeated runs, trajectory analysis, and pass-rate targets to tune benchmark quality.
- Added fixed AI budget controls and automated evaluation flows for running fast and strong models consistently without letting compute costs drift across trials.
- Developed refinement and validation loops that used verifier results, failed trajectories, and reviewer feedback to catch weak specs, shortcut solutions, and benchmark bugs before final approval.
- Built and shipped terminal-based LLM benchmark tasks for Human Union data, each with its own Docker environment, task spec, oracle solution, and automated verifier.
- Calibrated benchmark difficulty against frontier models such as GPT-5.4 Codex and Claude Opus 4.6, using repeated trial runs and target pass-rate bands to keep tasks challenging but solvable.
- Reviewed agent trajectories to separate real reasoning failures from unclear specs, verifier issues, or shortcut paths, then refined tasks until they were ready for reviewer approval.
Founding Full-stack AI Engineer
VoxHealth
- Worked as a founding full-stack AI engineer on VoxHealth, building an AI receptionist platform for healthcare practices that handles patient calls, scheduling, and front-desk workflows.
- Built the practice-facing front end in Next.js, covering operational views, AI workflow configuration, scheduling flows, and real-time updates.
- Developed Node.js back-end services and APIs that connected the application, AI agents, healthcare workflows, and third-party practice-management integrations.
- Built LangChain-based agent orchestration for multi-step healthcare workflows, including appointment handling, patient requests, tool calls, and handoff between AI and application services.
- Used BullMQ and Redis for async processing, retries, and background workflow execution, with Socket.IO for real-time notifications and status updates across active sessions.
- Worked across the product from front-end and back-end development to AI orchestration and integrations, helping shape the platform for healthcare practices where reliability, secure data handling, and workflow consistency mattered.
Senior Software Engineer
Mya Booking & Client Management Platform
- Reworked the booking and availability flow so appointment, staff, and role changes were validated in the back end, reducing double booking and inconsistent schedule states.
- Designed Django/PostgreSQL APIs and data models for appointments, staff roles, availability, and client records, including conflict handling when multiple updates happened at the same time.
- Added real-time schedule updates with Socket.IO and Redis so booking and availability changes were reflected across active sessions without manual refreshes.
- Built Next.js interfaces for schedule and client management using Tailwind CSS and Shadcn UI, keeping complex scheduling rules in the back end while giving users a simpler workflow.
- Used Celery for background jobs and async processing where work didn’t belong in the main request cycle, keeping user-facing actions responsive.
- Worked across the front end, back end, database, and AWS infrastructure, taking scheduling features from data modeling and API design through to the production UI.
Senior Software Engineer
Kayana VA
- Collaborated directly with the founder to turn an early concept into a clear product scope, questioning and removing low-value requirements so the team could ship faster and get user feedback sooner.
- Used Miro, Figma, and Monday.com with the design team to map user journeys, refine requirements, review mockups, and break the product into small release-ready features.
- Built the front end with Next.js, Tailwind CSS, and Redux Toolkit, covering client onboarding, virtual assistant profiles, assessments, search, matching, and scheduling flows.
- Created the back end with Django, PostgreSQL, Celery, and Redis, including background jobs, workflow processing, and real-time updates through WebSockets and Socket.IO.
- Designed AI-assisted onboarding flows that gathered client requirements through conversational assistants and structured surveys instead of relying on manual intake.
- Built agent workflows with LangChain/LangGraph for VA skill assessments, client requirement processing, candidate matching, and meeting scheduling.
- Implemented hybrid search using PostgreSQL, Pinecone, OpenAI embeddings, filtering, and ranking to match assistants against client requirements, reducing pairing time by 85%.
- Automated large parts of the hiring workflow, including assessment, matching, and scheduling, cutting the overall hiring process by roughly 90%.
- Integrated Calendly into the workflow so shortlisted candidates and clients could move directly from matching to interview scheduling.
- Deployed the Next.js application on Vercel and the Django services on AWS using Docker and Kubernetes for containerized deployment and scaling.
Software Engineer
Cendyn
- Built Node.js and Python microservices for processing real-time hotel booking and location data across Cendyn’s hospitality platform.
- Contributed to Kafka pipelines with Protobuf message contracts to move booking, property, and location updates between back-end services in near real time.
- Built back-end modules for third-party API integrations, mapping external booking and property data into the internal data model and existing event pipelines.
- Traced and fixed booking and location data issues across APIs, Kafka consumers, and back-end services, including cases where updates became stale or inconsistent between systems.
- Supported the React front end alongside the back-end work, building new components and connecting them with APIs and live data flows used across hotel operations and booking workflows.
Full-stack Software Engineer
Kallidus
- Built Ruby on Rails REST APIs with background job processing and optimized ActiveRecord queries.
- Cut CSV generation for large learning and compliance reports from about 60 minutes to 3 minutes by removing N+1 query patterns and moving the heavy data work into PostgreSQL stored procedures.
- Reworked the reporting data model, joins, and indexes so reports could process thousands of learner and course records without slowing down as filters became more complex.
- Moved repeated reporting logic out of application-level loops and into reusable PostgreSQL procedures, reducing database round-trip and keeping report results consistent.
- Built a lightweight internal npm state-management package used across 50+ components in the reporting UI, without bringing in Redux or MobX.
- Contributed to migrating the reporting and analytics front end from Vue to React, rebuilding shared report components while keeping existing filters, exports, and user workflows intact.
Experience
SmartStay: Hotel and Property Management SaaS (PMS)
RoverDent: Multi-tenant Patient Engagement and Practice Automation Platform
https://roverdent.com/AI Meeting Transcription SaaS, Live and Selling in 16 Days
https://briefmeet.ioHarvey AI - Legal Research & RAG Platform
https://www.harvey.ai/Merlin AI
Education
Bachelor's Degree in Information Technology
University of Sargodha, Lahore - Lahore, Pakistan
Skills
Libraries/APIs
React, Node.js, Web API, OpenAI API, REST APIs, SignalR, Entity Framework, Stripe, Auth0 API, jQuery, Shopify API, Vue, API Development, Claude API, vLLM, Shopify Storefront API, QuickBooks API, Vue 3, GraphQL API, Stripe API, Playwright, Twilio API, Graph API, Pandas, Beautiful Soup, PyTorch, OpenCV, TensorFlow, Google Sheets API, Moq, WhatsApp API, OpenID, NgRx, AG Grid, Socket.IO, Django ORM, Redis Queue, React Hook Form, Zod, React Query, ActiveRecord, Sidekiq, WebRTC
Tools
Jira, Visual Studio, GitHub, Postman, Slack, Hangfire, Azure Network Security Groups, n8n, Claude Code, Git, MSBuild, Figma, Amazon Elastic Container Service (ECS), Microsoft Copilot, SendGrid, Google Sheets, Microsoft Excel, Windsurf, Claude, Auth0, Amazon Cognito, ChatGPT, NVIDIA Jetson, Codex, Expo, AWS IAM, Amazon Simple Notification Service (SNS), Amazon Simple Queue Service (SQS), Logging, AWS Key Management Service (KMS), RabbitMQ, Azure Kubernetes Service (AKS), Terraform, NPM, Azure OpenAI Service, AWS Step Functions, Google Kubernetes Engine (GKE), CircleCI, SonarCloud, Shopify Plus, AI Prompts, GraphRAG, Drizzle ORM, GIS, Spreadsheets, Zapier, Microsoft Power BI, Microsoft AI, xUnit, MQTT, Flyway, Dapper, JetBrains Rider, Terminal, Claude Agent SDK, Celery, Shadcn UI, Prisma, Docker Compose, Pytest, Redux Toolkit, Miro, Confluence, Jenkins, Sentry, RSpec, NGINX, AWS CloudFormation, Amazon CloudWatch, AWS Fargate
Languages
JavaScript, SQL, TypeScript, Python, GraphQL, Java, CSS, HTML, Scala, C++, Go, PHP, Rust, Ruby, HTML5, CSS3, SPARQL, Google Apps Script, Stored Procedure, SAML, Bash
Frameworks
Angular, Selenium, ABP Framework, Next.js, NestJS, Tailwind CSS, JSON Web Tokens (JWT), OAuth 2, AngularJS, Express.js, React Native, Flutter, Windows Presentation Foundation (WPF), Django, Laravel, Agentic Frameworks, LangGraph, Ruby on Rails (RoR), Scrapy, LlamaIndex, Fastify, Flask, Entity Framework Core, Blazor, gRPC, IdentityServer 4, Spring Boot, Hibernate, Spring Security, Ruby on Rails 5, Django REST Framework, Priority Job Queue, Swagger
Paradigms
Azure DevOps, Microservices, Agile, Automation, REST API Architecture, DevOps, Role-based Access Control (RBAC), B2B, HIPAA Compliance, Event-driven Architecture, Real-time Systems, UI Design, Web Performance Optimization (WPO), Scrum, Continuous Delivery (CD), Continuous Integration (CI), UX Design, Asynchronous Programming, Continuous Deployment, Fast Healthcare Interoperability Resources (FHIR), Database Design, REST, Event Sourcing, Functional Testing, Unit Testing, ETL, Management, Back-end Architecture, Testing, Best Practices, Maintainability, Search Engine Optimization (SEO), Responsive Web Design (RWD), ACID, Application Architecture, CQRS, Clean Architecture, Microservices Architecture, Code Refactoring, Model Context Protocol (MCP), Automated Testing, Test Automation, Load Testing, Scalable Application, DevSecOps, Asynchronous Development, API Architecture, Eventual Consistency, Agile Software Development
Platforms
Docker, Windows, Visual Studio Code (VS Code), AWS IoT, Azure, Amazon Web Services (AWS), WordPress, Microsoft Copilot Studio, Twilio, AWS Lambda, Kubernetes, Shopify, Vanta, Google Cloud Platform (GCP), Vercel, Netlify, Apache Kafka, AWS IoT Core, Microsoft, Android, Harness, Grok, Webflow, Replit, Microsoft Power Automate, LiveKit, Oracle, New Relic, Linux, Amazon EC2, LangSmith
Storage
Microsoft SQL Server, SQLite, Database Management, PostgreSQL, MySQL, Databases, Microsoft Entra ID, Redis, Data Pipelines, Relational Databases, NoSQL, MongoDB, Data Integration, Google Cloud, ClickHouse, Database Performance, Azure Cosmos DB, Amazon DynamoDB, Amazon S3 (AWS S3), Database Transactions, Data Synchronization, Database Architecture, Elasticsearch, Datadog, Data Validation, Database Security
Industry Expertise
Project Management, Web Design, Insurance, Healthcare, Automotive
Other
SaaS, Multi-tenant Architecture, CI/CD Pipelines, PCI, Inventory, SQL Server, Azure Data Factory (ADF), Multi-tenant SaaS, PCI DSS, Cloud Security, System Architecture, Architecture, Database Schema Design, Performance Tuning, Webhooks, Internet of Things (IoT), Full-stack, API Integration, Enterprise Resource Planning (ERP), APIs, WebSockets, Artificial Intelligence (AI), CRM, Large Language Models (LLMs), Enterprise Integration, Infrastructure as Code (IaC), Third-party Integration, FastAPI, Vite, Temporal, Cloud Architecture, Cloud Governance, Solution Architecture, Technical Leadership, AI Agent Orchestration, AI Development, Cloud Infrastructure, Database Optimization, Performance Optimization, Cryptocurrency, Fintech, Dashboards, Full-stack Development, User Interface (UI), Identity & Access Management (IAM), Ticketing Systems, Compliance, Multi-factor Authentication (MFA), Single Sign-on (SSO), User Onboarding, AI-assisted Development, AI-augmented Software Engineering (AIASE), Open Banking, Tailwind UI, Open Banking APIs, Data Architecture, Software Architecture, Software Design, Third-party APIs, Agentic Coding, Data Engineering, Finance, Leadership, Finance APIs, Financial APIs, Prompt Engineering, AI Integration, Startups, Agentic AI, Agentic Workflow Design, Cursor AI, Workflows, AI Agents, User Experience (UX), User Flows, Product Design, Application Modernization, User Experience Design, AI Tools, Integration, Authentication, Authorization, Analytics, API Design, Microsoft Entra External ID, Customer Identity and Access Management (CIAM), Payments, RESTFul APIs, Back-end Development, Front-end Development, Back-end, Command-line Interface (CLI), AI Accelerators, Artificial Intelligence of Things (AIoT), Edge AI, Embedded Systems, IOTA, Website Performance, Computer Science, Supabase, Containerization, Data Modeling, RAG Systems, Mobile App Development, Progressive Web Applications (PWAs), Multitenancy, Front-end, Human Resources (HR), Minimum Viable Product (MVP), Anthropic, OpenAI, LLM Integration, Real-time Data, Web Application Design, Problem Solving, AWS ECS Fargate, Debugging, Distributed Systems, Distributed Tracing, Fault Tolerance, Monitoring, Observability, Production Support, Reliability Engineering, Scalability, System Design, Workflow, Workflow Automation, AI Automation, Data Management, Electronic Health Records (EHR), Electronic Medical Records (EMR), SOC 2, Security, AI Voice Agents, Machine Learning, OutSystems, Code Review, Technical Architecture, Troubleshooting, Custom Shopify Apps, QR Codes, Scalable Architecture, eCommerce, User Authentication, Bug Fixes, IT Security, QA Testing, Quality Assurance (QA), ARM Architecture, ARM SoC, Coding, Stock Market, Technical Consulting, Project Consultancy, Web Extensions, Onboarding, IT Audits, GitFlow, Pub/Sub, Microsoft Azure, OAuth, OData, Generative Artificial Intelligence (GenAI), Data Extraction, Data Mapping, Process Automation, QuickBooks Online, Terraform Cloud, Streaming, GPS, Telematics, API Management, Product Ownership, Cloud Engineering, Cloud Platforms, Cloud, Site Reliability Engineering (SRE), LangChain, State Machines, Concurrency, Optical Character Recognition (OCR), Server-side Rendering (SSR), Monorepos, Turborepo, Mortgages, Geolocation, Maps, Web Security, Web Applications, Data Scraping, Product Development, Data Science, Reports, Firebase Cloud Functions, Web Development, Training, Platforms, Education Technology (Edtech), Infrastructure, Orchestration, Data, Email, Email Systems, DNS Configuration, Business to Consumer (B2C), DNS, Data Orchestration, Pipelines, SMTP, Lovable, Instantly, Billing, MVP Design, Front-end Architecture, Agentic AI Systems, Event-driven Systems, Large Language Model Operations (LLMOps), Machine Learning Operations (MLOps), Geospatial Data, Event Streaming, Payment APIs, Digital Design, Cloudflare, AI Model Training, Big Data, General Data Protection Regulation (GDPR), IT Infrastructure, Scaling, Technical Hiring, Technical Standards, Amazon Bedrock AgentCore, Data Analytics, Sports, Time Series Analysis, AI-generated Code, Scripting, Payment Gateways, Shopify Customizations, Shopify Design, ChatGPT API, Communication, Marketplaces, Product Management, Vibe Coding, Prototyping, Integrations, Monday.com, Benchmarking, LLM Agents, Performance, Reliability, AI Chatbots, Chatbots, OpenAI SDK, Agentic RAG Systems, AI Architecture, AI Engineering, Core Web Vitals, SEO Tools, A/B Testing, Marketing Automation, Open Source, Software as a Service (SaaS), System Optimization, AI Model Integration, Computer Vision, Image Processing, Retrieval-augmented Generation (RAG), Solution Engineer, Vector Search, Recommendation Systems, AI Workflow, High Availability (HA), Web Scraping, CAPTCHA, Fractional CTO, ChatGPT Prompts, AI Compliance, AI Security, Product Roadmaps, Go-to-market (GTM) Strategy, Early-stage Startups, Branding, Design, Landing Pages, Forms, Knowledge Graphs, Booking Apps, Customer Relationship Management (CRM), Deepgram, System Integration, Search Engines, Accessibility, Reporting, SQLModel, Video Analysis, Chromium, Auditing, Railway, Location Services, RAG Architecture, AI Safety, Digital Banking, Financial Services, Microfinancing, Support, Podcasting, Megaphone, Ads, Marketing Campaigns, Google Cloud Platform, Natural Language Processing (NLP), Pgvector, Care CRM, Health, CRM developer, Domain-driven Design (DDD), Global Distribution Systems (GDS), Web Application Firewall (WAF), POS, GDS Integration, Dynamic Pricing, Indexing, IIS, Microsoft 365, Legal Technology (Legaltech), System Architecture Design, GitHub Actions, OPC UA, PayPal, Azure Service Bus, Serverless, Boilerplate Code, OpenID Connect (OIDC), AWS Management Console, Microsoft Lists, Computer-Aided Design (CAD), Source Code Review, Embeddings from Language Models (ELMo), AI Design, Vercel Analytics, Migration, Software Engineering, CSV File Processing, LLM Inference, Chrome Extensions, PostgreSQL 9, Background Jobs, Amazon RDS, Caching, Pinecone, Vector Databases, Semantic Search, Hybrid Search, Reranking, Candidate Matching, Tasks, Analysis, Structured Outputs, Tool Calling, Human-centered AI, LLM Evaluation, Multi-agent Systems, Multi-agent Orchestration, Sprint Reviews, Application Monitoring, Incident Management, Release Management, Software Deployment, Integration Testing, Regression Testing, Query Optimization, Data Security, Enterprise SaaS, Web Scalability, Legacy Code, Protocol Buffers, Hospitality, Location Tracking, AI Systems, AI Evaluation, AI Infrastructure, Code Auditing, Function Calling, Model Evaluation, Booking Systems, Conflict Resolution, Application State Management, Production Engineering, AWS Cloud Architecture, Real-time Streaming, Product Discovery, Requirements, Real-time Data Pipelines, Concurrency Patterns, Business Process Automation, Multi-agent, AI Compliance Agents, Information Retrieval, Reranking Models, Matching Systems, Hybrid Retrieval, Vector Search Architecture, Semantic Retrieval, Data Pipeline Architecture, Data Processing Pipelines, Scheduling Tools, Container Orchestration, Cross-functional Collaboration, Stakeholder Management, API Documentation, Sprint Planning, Property Management, Conversational AI, Healthcare Services, BullMQ, Healthcare Software, Healthtech, HIPAA, Appointment Booking, Practice Management, Founding Engineer, Telephony, SIP, Voice AI, Speech-to-Text (STT), Text-to-Speech (TTS), Human-in-the-loop (HITL), Secure API Design, Encryption, HL7
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring