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RARana Arslan
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Outside the US Eastern window right now

RANA
ARSLAN

Your Eastern workday. My Lahore night shift.

I ship Rails scheduling systems, MERN health-tech, and live RAG products while sitting inside a full US 9-5 from Pakistan.

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Senior Full-Stack Engineer · 10 Years Shipping Production SaaS
Ruby on Rails Scheduling Systems · MERN Health-Tech · LLM / RAG Integration

US EasternOff window

Lahore

--:--:--

New York

--:--:--

01What I build

Three lanes. All production.

Scheduling and practice-management on Rails. Health-tech and SaaS on MERN. Grounded LLM features that ship into live products, including matcharesident.com.

01 / Ruby on Rails

Scheduling & Practice-Management SaaS

60% faster APIs · 95% fewer job failures

Appointment and provider-availability logic, multi-location scheduling, compliance and records, and the background job pipelines that quietly fail when volume doubles. A decade of Rails, with four of my last five products in this exact space. At Westside I cut average API response time by 60% on a platform serving 30+ clinics, and cut failures by 95% on a Sidekiq pipeline processing 20,000+ jobs a day.

  • Westside Children's Therapy
  • TruMed Systems
  • Procare Solutions
  • ClikDone
  • DevCache

02 / MERN Full-Stack

Health-Tech & SaaS

Node.js and Express services, React front-ends, and MongoDB data models, carrying real clinical and operational domain knowledge into JavaScript stacks. React shipped across multiple production products; REST and service layers built to hold up under real traffic. The same understanding of appointments, records, and workflows that the Rails work is built on.

  • React at Westside, ClikDone & TruMed
  • Node / Express / MongoDB across MERN builds

03 / LLM / RAG

AI Feature Integration

Live RAG product in production

I add AI features to existing SaaS without breaking what already works. matcharesident.com is a live retrieval-augmented product I built and deployed: it retrieves over residency data and grounds every LLM response in that source data, built in Python with LangChain and OpenAI/Anthropic APIs. Retrieval pipelines, prompt design, and grounding, wired into a real product rather than a demo.

  • matcharesident.com, live and deployed
02Proof

Numbers from systems that already ship.

Latency, reliability, and throughput, measured on live platforms, not demos.

0+

years shipping production SaaS

0%

avg API response time cut at Westside

0%

drop in Sidekiq pipeline failures

0+

background jobs hardened per day

03Experience

A decade of shipping under real constraints.

Healthcare, childcare, payments, and multi-clinic operations. Each role with a clear problem and measurable outcomes.

01

Full-Stack Developer

Westside Children's Therapy

  • Cut average API response time by 60% by refactoring N+1 queries, adding Redis caching, and optimising PostgreSQL indexes on a Rails platform serving 30+ therapy clinics.
  • Hardened the Sidekiq pipeline processing 20,000+ jobs/day, cutting failures on billing-critical workflows by 95%.
  • Shipped 12+ scheduling and patient-management features end to end (Rails API + React), cutting manual admin work an estimated 8-10 hours/week for clinic staff.

Aug 2024 - Present
US · Remote

02

Senior Software Engineer

ClikDone

  • Architected and built the entire web application (backend, frontend, and infrastructure) from concept to production launch.
  • Built the full payments and communications layer (Stripe, SendGrid, Twilio) powering automated invoicing, email, and SMS across thousands of monthly transactions with zero payment-data incidents.
  • Delivered 15+ core features working directly with the founder as de facto product owner and engineer.

Apr 2023 - Aug 2024
US · Remote

03

Senior Software Engineer

TruMed Systems

  • Designed and documented 25+ new API endpoints for a US healthcare platform, enabling partner and reporting integrations.
  • Cut heavy report generation from minutes to under 10 seconds by rewriting complex PostgreSQL queries and adding targeted indexes.
  • Converted 30+ mockups into responsive production UI (React) and resolved user-reported defects across testing phases.

Apr 2021 - Mar 2023
US · Remote

04

Senior Software Engineer

Procare Solutions

  • Built REST API endpoints managing school programs, children, and guardian records for the #1 US childcare platform (37,000+ centers), with serializers, documentation, and automated tests.
  • Raised test coverage on owned modules from ~40% to 85%+, cutting regression bugs during release cycles.

Apr 2020 - Apr 2021
US · Remote

05

Software Engineer to Senior

DevCache

  • Led Rails development across 8+ client products over 4 years, maintaining 10+ live production sites at 99.9% uptime.
  • Performed Rails version upgrades and legacy modernisation, keeping products secure and maintainable.
  • Mentored 5 junior developers and introduced code review standards, cutting production bugs ~30%.

Mar 2016 - Apr 2020
Lahore · On-site

04Selected work

Products that are live, not slides.

Featured RAG in production, plus live platforms from therapy ops to childcare, healthcare inventory, and service-business SaaS.

FeaturedLive · Deployed

matcharesident.com

Live RAG/LLM product. Retrieval over residency data with grounded LLM responses, built in Python with LangChain and OpenAI/Anthropic APIs. Deployed and running.

Visit site
PythonLangChainOpenAIAnthropicRAG
westsidect.comProduction · Current

Pediatric therapy platform for Westside Children's Therapy across 30+ Chicagoland clinics. Rails + React scheduling and patient-management features, with API response times cut 60% and Sidekiq failures down 95% on a pipeline of 20,000+ jobs/day.

Ruby on RailsReactPostgreSQLRedisSidekiq
clikdone.comProduction

Full web application from concept to launch for a service-business platform: CRM, invoicing, and payments. Built the payments and communications layer (Stripe, SendGrid, Twilio) powering automated invoicing, email, and SMS across thousands of monthly transactions.

Ruby on RailsReactStripeSendGridTwilio
trumedsystems.comProduction

US healthcare vaccine storage and inventory platform (AccuVax / AccuShelf / AccuSite). Designed 25+ API endpoints for partner and reporting integrations, cut heavy report generation from minutes to under 10 seconds, and shipped 30+ React screens from mockup to production.

Ruby on RailsReactPostgreSQLREST APIs
procare.comProduction

Child care management software for the #1 US platform serving 37,000+ centers. Built REST APIs for school programs, children, and guardian records with serializers, docs, and tests, and raised owned-module coverage from ~40% to 85%+.

Ruby on RailsPostgreSQLREST APIsRSpec
05Technical skills

The tools behind the outcomes.

Everything listed here has shipped in production, not a wishlist.

Backend

  • Ruby on Rails (10 yrs)
  • Ruby
  • Node.js / Express
  • Python
  • Sidekiq / background jobs
  • REST API design

Frontend

  • React.js
  • TypeScript
  • JavaScript
  • Tailwind

Databases

  • PostgreSQL
  • MongoDB
  • Query optimisation & indexing
  • Redis caching

AI / LLM

  • LangChain
  • RAG pipelines
  • OpenAI / Anthropic APIs
  • Shipped live at matcharesident.com

Cloud & DevOps

  • AWS (EC2, RDS, S3)
  • Docker
  • CI/CD

Integrations

  • Stripe
  • Twilio
  • SendGrid
  • Shopify API
  • GraphQL

Education

BSc Software Engineering

Riphah International University · 2013 - 2017 · GPA 3.28

06Availability and contact

Book the overlap.

Contractor from Lahore, aligned to a full US Eastern business day. Direct lines only, no forms.

You are outside my working window right now

LHE --:--:-- · NYC --:--:--

Primary channel

contact@itsarslan.com
Email meResume
Phone+92 305 4009230
LocationLahore, Pakistan · Remote
GitHubranaarslan11LinkedInrana-arslan-fullstack-developerSiteitsarslan.com

Engagement

Contractor. No US/UK/EU work authorisation required or offered.

Hours

6pm-2am PKT · full 9-5 US Eastern

Availability

Immediate, no notice period

Payment

Payoneer / Wise / Deel

Standups, pairing, and incident response all fall inside that window.