Available 5 days/week · Short & long-term engagements

I help teams ship scalable platforms without rewrites.

8+ years turning complex requirements into clean, production-grade systems. I architect cloud-native applications, lead engineering teams, and ship with confidence across SaaS, healthcare, and enterprise.

Book a discovery call See my work

karnav.pargi@gmail.com +91 9601096013 India

Healthcare SaaS Platforms

Multi-Tenant Architecture

Angular Modernization

What I do

I build scalable SaaS architectures. Multi-tenant platforms. High-performance systems. I help teams avoid rewrites by getting the foundation right.

How I work with teams

Four engagement shapes — from a focused two-week audit to a long-term fractional partnership. Each tailored to your stage and needs.

Architecture Review & Advisory

Duration: 1–3 weeks · fixed scopeBest for: Founders & CTOs validating direction before a big build.

Deep audit of your codebase, infrastructure, and team workflows. You walk away with a prioritized roadmap, risk register, and concrete next steps — not a slide deck.

System & data architecture audit

Scalability, security & cost review

Prioritized 90-day roadmap

Fractional Tech Lead

Duration: Long-term · up to 5 days/weekBest for: Seed–Series B SaaS teams scaling their engineering org.

Embedded technical leadership for teams without a senior architect in-house. I drive standards, unblock engineers, own critical-path delivery, and mentor your team.

Hands-on architecture & code review

Hiring, mentoring & process design

Stakeholder & roadmap alignment

Multi-tenant SaaS Build

Duration: Project-based · 4–16 weeksBest for: Teams that need a senior pair of hands to ship a critical module.

End-to-end delivery of production-grade SaaS features: multi-tenant data models, RBAC, billing, integrations, and the front-end to match. Ship-ready, not POC.

Multi-tenant backend (Node/NestJS)

Angular / React front-end

AWS or Azure deployment & CI/CD

Rescue & Refactor Sprint

Duration: Short-term · 2–6 weeksBest for: Teams stuck on a specific bottleneck or stability issue.

Targeted intervention for slow, flaky, or hard-to-maintain systems. Performance tuning, legacy modernization, or untangling a release blocker — surgically, no rewrite required.

Performance & reliability fixes

Legacy modernization (incremental)

Test, CI & deployment hardening

Let's talk

Where I've delivered

Selected roles across SaaS, healthcare, and enterprise platforms.

Senior Software Engineer

BigRio (via EvoSync Solutions)

Aug 2025 — Apr 2026

Remote

Analyst

ValueLabs LLP

Mar 2024 — Aug 2025

Hyderabad, India

Software Engineer

NewFire Global Partners

May 2023 — Jan 2024

Remote

Senior Software Engineer

CustomerXPs

Oct 2022 — May 2023

Bengaluru, India

Senior Software Engineer

Bytes Technolab

Oct 2021 — Oct 2022

Ahmedabad, India

Software Developer

DigiCorp

Sept 2019 — Oct 2021

Ahmedabad, India

Backend Developer

IndiaNIC Infotech

Jan 2018 — Oct 2019

Ahmedabad, India

Selected work

Production systems I've architected or led — outcomes over features.

AI Trip Planner

AI WhatsApp Travel Bot

→Engineered a WhatsApp bot that generates personalized travel itineraries with budget breakdowns using AI-powered planning.
→Architected a real-time intent classification and parser system extracting travel parameters (destination, duration, budget, group size, preferences) from natural language.
→Built a budget allocation decision engine splitting costs across accommodation, transportation, activities, and food.
→Integrated multi-provider WhatsApp infrastructure (Twilio + Meta Cloud API) with webhook security validation and status tracking.
→Implemented a RAG system using Pinecone vector embeddings plus Groq Llama LLM integration for context-aware, conversational destination recommendations.
→Established production-grade architecture with conversation memory, error handling, Swagger/OpenAPI docs, and a 67+ test suite for reliability.

NestJSTypeScriptGroq APIRAGPineconeTwilioMeta WhatsApp APIJestMicroservicesWebhook Security

SPRI Healthcare Platform

Healthcare Data Platform

→Designed a scalable, cloud-native platform managing patient-reported outcomes (PRO), clinical workflows, and research data systems.
→Architected high-performance REST APIs and microservices with NestJS and TypeScript for a multi-tenant SaaS architecture.
→Built modular backend services for survey orchestration, patient data processing, and reporting across web, mobile, and tablet.
→Standardized shared backend libraries that cut cross-service code duplication by ~40% and accelerated new-feature delivery.
→Survey orchestration services processed tens of thousands of patient-reported responses per month across multiple tenants.

TypeScriptAngularMicro-frontendNestJSPrismaMariaDBAWSMulti-tenancy

Skiyodl

Hotels & Ski Rentals

→Developed new frontend features and managed the admin panel for a hotels & ski-rental platform.
→Led Angular upgrade from v14 to v18 and migrated project-wide modules to standalone components; upgraded PrimeNG v14 → v17.
→Managed deployments, hardened AWS WAF, and resolved large-payload upload issues — delivered a 30% performance improvement.
→Cut deployment time by ~40% and reduced large-payload upload failures by ~90% after hardening the AWS WAF and upload pipeline.

Angular 18NgRxRxJSPrimeNGNode.jsMongoDBAzure PipelinesAWS

TruCare Cloud — Centene

Health Insurance Portal

→Product Support Engineer across Angular, Node.js, NestJS, and MongoDB/Mongoose stack.
→Resolved high-priority bugs within tight deadlines to ensure reliability and customer satisfaction.
→Collaborated with cross-regional teams to deliver seamless product support under HIPAA & GDPR.
→Reduced the high-priority production bug backlog by ~50% and helped sustain ~99.9% platform uptime under HIPAA & GDPR.

AngularRxJSNode.jsNestJSMongoDBharness.ioAWSHIPAAGDPR

Cancer Journey Care

Cancer Diagnostics — Predictive Q&A

→Built an algorithm linking questions and answers so each new question adapts to the patient's response pattern.
→Implemented a payment service for patient-asked questions via PayPal.
→Ensured HIPAA-compliant handling of patient data end-to-end.
→Adaptive questionnaire flow lifted survey completion rates by ~25% by tailoring follow-up questions to prior responses.

Node.jsExpressMongoDBPayPal APIAWS EC2/S3Comprehend MedicalTranscribe Medical

CSG Forte — DEX

Pioneering Payment Processing

→Led R&D and successful integration of Google Pay and Apple Pay into the Angular-based DEX web app.
→Designed an integration strategy ensuring secure, consistent behaviour across browsers and devices.
→Built admin-panel controls letting merchants toggle digital-wallet availability in real time.
→Digital-wallet checkout (Google Pay / Apple Pay) improved payment conversion by ~15% with consistent behaviour across browsers and devices.

AngularTypeScriptRxJSAngular MaterialGPay APIApple PayAML

CCPMS

Car Charge-Point Management System

→Dedicated R&D on OCPP 1.6 and implemented an OCPP-based backend to register and manage charging stations.
→Built a secure WebSocket channel in Node.js/Express + MongoDB between station and central system.
→Designed flows for reserving and starting/stopping a charge with one click from the ChargePoint app; SSL-secured connections.
→Backend managed hundreds of charging stations over secure WebSockets with sub-second start/stop response times.

Node.jsWebSocketOCPP 1.6ExpressMongoDBAWS EC2/S3SSL

JetpackED

SaaS Data-Analysis Tool (Education)

→Co-designed the SaaS architecture and microservices for a multi-tenant analytics platform.
→Built multi-layered filters (single, multi, checkbox) in Angular v8 with Propeller UI, plus microservice APIs for Schools, Teachers, Classes, Students, and Reports.
→Implemented cron jobs to ingest third-party data into MySQL and integrated SSO via Clever developer APIs.
→Multi-tenant analytics platform scaled to 200+ schools and 10k+ students, with nightly cron jobs ingesting third-party data into MySQL.

AngularTypeScriptNode.jsMicroservicesExpressMySQLTypeORMAWS

Predictive Parts Management

Yacht Maintenance Portal (Offline)

→Built an offline-capable predictive parts service maintenance portal for yachts.
→Implemented backend in Node.js/Express with MongoDB, deployed on AWS.
→Offline-first architecture delivered near-100% feature availability at sea, with automatic data sync on reconnect.

Node.jsExpressMongoDBAWSOffline-first

Tech stack

Frontend

Angular (v8–v21)ReactNgRxRxJSPrimeNGMicro-frontendsSingle SPAModule Federation

Backend

Node.jsNestJSExpressGraphQLREST APIsMicroservicesSystem DesignDistributed Systems

Cloud & DevOps

AWS (Lambda, API Gateway, SQS, EventBridge, EC2, S3, CloudFront, CloudWatch, WAF, X-Ray, Route 53)AzureDockerGitCI/CDLinuxPerformance OptimizationJestESLintPrettierpnpm

Databases

PostgreSQLMongoDBMySQLMariaDBPinecone (Vector DB)

Architecture

Micro-frontendsMicroservicesSingle SPAModule FederationEvent-driven systemsMulti-tenant SaaSMicroservices ArchitectureCloud ArchitectureApplication ModernizationHealthcare Platforms

Agentic AI

ClaudeCursor IDEopencodeLovableAI-assisted delivery workflows

LLM & AI

Groq APILLM IntegrationRAG SystemsVector EmbeddingsPinecone (Vector DB)Llama ModelsIntent ClassificationPrompt Engineering

Integration & Messaging

TwilioMeta WhatsApp Cloud APIWebhook Security & ValidationSwagger / OpenAPIRESTful API Design

Process & Leadership

SDLCAgile MethodologiesScrumCode ReviewsTechnical DocumentationRequirements GatheringTechnical LeadershipMentoringProduction Support

Ready to scale?

Share your challenge. I'll respond within 24 hours with a concrete path forward or a calendar link.