Muhammad Tahir Hassan Khan

I'm a backend-focused software engineer with nearly three years of experience building and scaling a multi-tenant healthcare care-coordination platform. Hospital systems use it to manage patient engagement across the surgical and orthopedic care journey. I started by delivering individual features and grew into owning the end-to-end design of core subsystems: patient journey automation, EHR integrations, and outcomes analytics. On a multi-country online tutoring platform (FastAPI and PostgreSQL backend, Next.js dashboard, Flutter app), I owned the hard, unglamorous parts: money, concurrency, identity, and messaging. I also spent a year (2023–2024) as a backend engineer on Sokkat, a UAE-based e-commerce mobile app, building Node.js APIs on top of Shopify and PostgreSQL.

1. Backend Software Engineer · Healthcare technology company (name under NDA)

   Nearly 3 years · Present

   • Progressed from backend feature engineer to owner of several core subsystems on a multi-tenant care-coordination platform
   • Owned the patient journey automation engine: state-machine-driven outreach based on appointments, consent, and quiet hours
   • Built and maintained the EHR integration layer, normalizing multi-vendor clinical events into a common FHIR-based model
   • Designed tenant-scoped data access across queries, background jobs, and cache keys
   • Built Bull/BullMQ + Redis job infrastructure for scheduled and event-driven patient outreach
   • Integrated LLM features (patient chat, triage, clinical note drafting) with consent checks and outage fallbacks
   • Contributed to the patient-reported outcomes analytics pipeline and campaign messaging systems

2. Full-Stack Engineer · Multi-country online tutoring platform (confidential)

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   • Audited and hardened the self-service booking engine, adding Postgres-backed tests that prove its row locks work
   • Modelled the credit-hours booking domain so admin-granted hours became spendable
   • Centralised tutor pay into one server-side rate seam and built a unified finance hub
   • Designed enumeration-safe, org-scoped public IDs with per-recipient visibility
   • Audited 49 notification issues, closed a link-poisoning vulnerability, and built reply-by-link
   • Cut the slowest dashboard route from 11.0 s to 3.8 s and removed hosting-cost drivers

3. Backend Engineer · Sokkat (UAE-based e-commerce)

   2023 — 2024

   • Built Node.js APIs powering the Sokkat mobile app
   • Integrated the app with the store's Shopify backend
   • Worked with PostgreSQL for the backend data layer

Backend

Node.js, Express, Python, FastAPI, SQLModel / SQLAlchemy, Bull / BullMQ

Databases

PostgreSQL, MongoDB / Mongoose, Redis, Alembic migrations

Auth & Multi-Tenancy

Auth0, JWT validation, Tenant-scoped data access, HMAC-signed tokens

Healthcare Interoperability

FHIR, HL7, EHR vendor APIs, Clinical event normalization

Integrations

Twilio SMS & Voice, Voice AI agents, Shopify, SMTP & push

AI / LLM

RAG chatbots, LLM triage, Clinical note generation

Frontend & Mobile

TypeScript, Next.js, React, SWR, Flutter

Testing

pytest, Mocha / Chai / Sinon, Vitest, Playwright, Testcontainers

Delivery

CI-gated deploys, Expand/contract migrations, Sentry

• Patient Journey Automation Engine

  A state-machine-driven engine that schedules and sends patient communications across the surgical journey, based on appointment events, consent status, and quiet-hours rules.

• EHR Integration Layer

  Normalizes clinical event data from multiple EHR vendors into a common FHIR-based model, so each new vendor needs only one adapter.

• Multi-Tenant Data Access & Job Infrastructure

  Tenant-scoped data access and Bull/BullMQ + Redis job infrastructure powering scheduled and event-driven patient outreach for multiple hospitals.

• LLM Features in Clinical Workflows

  Patient chat, triage assistance, and clinical note drafting integrated into backend workflows, with consent checks and outage fallbacks.

• Multi-Country Online Tutoring Platform

  Booking, credit hours, tutor pay and finance, public IDs, and notifications for an online tutoring platform serving admins, tutors, parents, and students.

• Sokkat

  Backend for Sokkat, a UAE-based e-commerce store with a mobile app: Node.js APIs for the app, integrated with a Shopify backend and PostgreSQL.

• Outcomes Analytics & Patient Campaigns

  Contributions to the patient-reported outcomes (PRO) analytics pipeline and campaign messaging systems.

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