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.

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karnav.pargi@gmail.com +91 9601096013 India LinkedIn GitHub Medium HackerRank X PaidNinjas
Karnav Pargi — senior software engineer & consultant
Healthcare SaaS Platforms
Multi-Tenant Architecture
Angular Modernization
Cloud Infrastructure
Clinical NLP Systems
Secure Enterprise Systems
Micro-Frontend Platforms
Micro-Services
High-Scale APIs
System Designs

How I work with teams

Four engagement shapes — from a focused two-week audit to a long-term fractional partnership. Pick what fits your stage; we tailor scope on the discovery call.

1–3 weeks · fixed scope

Architecture Review & Advisory

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
Best for: Founders & CTOs validating direction before a big build.
Long-term · up to 5 days/week

Fractional Tech Lead

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
Best for: Seed–Series B SaaS teams scaling their engineering org.
Project-based · 4–16 weeks

Multi-tenant SaaS Build

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
Best for: Teams that need a senior pair of hands to ship a critical module.
Short-term · 2–6 weeks

Rescue & Refactor Sprint

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
Best for: Teams stuck on a specific bottleneck or stability issue.
Discuss your project

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 case studies

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

                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)
                • React
                • NgRx
                • RxJS
                • PrimeNG
                • Micro-frontends
                • Single SPA
                • Module Federation

                Backend

                • Node.js
                • NestJS
                • Express
                • GraphQL
                • REST APIs
                • Microservices
                • System Design
                • Distributed Systems

                Cloud & DevOps

                • AWS (Lambda, API Gateway, SQS, EventBridge, EC2, S3, CloudFront, CloudWatch, WAF, X-Ray, Route 53)
                • Azure
                • Docker
                • Git
                • CI/CD
                • Linux
                • Performance Optimization
                • Jest
                • ESLint
                • Prettier
                • pnpm

                Databases

                • PostgreSQL
                • MongoDB
                • MySQL
                • MariaDB
                • Pinecone (Vector DB)

                Architecture

                • Micro-frontends
                • Microservices
                • Single SPA
                • Module Federation
                • Event-driven systems
                • Multi-tenant SaaS
                • Microservices Architecture
                • Cloud Architecture
                • Application Modernization
                • Healthcare Platforms

                Agentic AI

                • Claude
                • Cursor IDE
                • opencode
                • Lovable
                • AI-assisted delivery workflows

                LLM & AI

                • Groq API
                • LLM Integration
                • RAG Systems
                • Vector Embeddings
                • Pinecone (Vector DB)
                • Llama Models
                • Intent Classification
                • Prompt Engineering

                Integration & Messaging

                • Twilio
                • Meta WhatsApp Cloud API
                • Webhook Security & Validation
                • Swagger / OpenAPI
                • RESTful API Design

                Process & Leadership

                • SDLC
                • Agile Methodologies
                • Scrum
                • Code Reviews
                • Technical Documentation
                • Requirements Gathering
                • Technical Leadership
                • Mentoring
                • Production Support

                Let's scope your project.

                Tell me about your team, stack, and what you're trying to ship. I reply within a working day with next steps or a calendar link.

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