karthik.dev

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Hi, I’m Karthik.
Full-stack
software engineer

I build the interfaces, APIs, and data systems behind fintech and SaaS products.

4+ years across web platforms, payments, and performance. Contributing across Spacez and its 55+ module PMS, from architecture and product workflows to web and Android delivery.

Explore my work Download résumé
Fintech-focused résumé ↗

TypeScript · Next.js · NestJS · PostgreSQL

01 / selected work

Systems I’ve worked on.

Professional platforms, personal products, and projects you can explore in public.

~/spacez/pms · internal platform

55+operations modules
Web+ Android delivery
  1. 01
    Product workflows

    Bookings, calendar, pricing & daily operations

  2. 02
    Teams & portals

    Access controls, owner/franchise portals & communications

  3. 03
    Platform delivery

    Architecture, backend, shared design system & Android

Capability overview · not an internal product screenshot

Product platforms · Professional work

Spacez & Spacez PMS (Product Management Systems)

End-to-end development across 55+ PMS modules: bookings, calendar, pricing, operations, finance, media, communications, and owner/franchise portals, with a shared design system and Android delivery.

SDE 1 · Spacez Pvt Ltd

  • Next.js
  • TypeScript
  • Firestore
  • Firebase Admin
  • Zustand
  • Capacitor
  • Claude API
Read case study
orange

Everyday money.
Shared life.

  • TrackExpenses, receipts & spending insights
  • SplitFriends, groups & event budgets
  • SettleBalances, records & conversations

Product overview · Flutter + NestJS

Money management · Personal product

Orange

A multifunctional money management app built with Flutter and NestJS: expense tracking, flexible bill splits, group and event budgets, settlement records, chat, spending insights, and AI-assisted receipt scanning.

Creator · Mobile app & backend

  • Flutter
  • Dart
  • NestJS
  • MongoDB
  • Dio
  • Hive
  • Gemini
Read case study
www.indiancashback.com
IndianCashback public website homepage

Fintech · Professional work

IndianCashback

Frontend and backend work across a cashback platform, with a schema redesign, Redis caching, and Meilisearch integration.

Full-Stack Developer · Revontulet Solutions

  • Next.js
  • NestJS
  • MongoDB
  • Redis
  • Meilisearch
Read case study Visit site ↗
www.spacez.co
Spacez public website homepage

Hospitality · Professional work

Spacez

Consumer platform redesign with Next.js App Router, Firebase, Razorpay payments, and end-to-end booking and pricing workflows.

SDE 1 · Spacez Pvt Ltd

  • Next.js
  • TypeScript
  • Firebase
  • Tailwind CSS
  • Razorpay
Read case study Visit site ↗

ICB Wallet

Virtual wallet and card workflows integrated with the InstantPay bank API.

Next.js · NestJS · MongoDB

EnConnect

Multi-tenant business profiles, tiered templates, and a role-based admin panel.

React · Express · MongoDB

Built in public

Source code, live demos, and technical documentation.

Full-stack application

Smartcare

Appliance service website with validated booking requests, server-side integrations, and integration/browser tests.

Next.js · TypeScript · API integration

Source ↗Live demo ↗

Interactive 3D

Kinetic · Engine Lab

An engine workbench with a 3D assembly, local hand tracking, and keyboard and pointer controls.

Next.js · Three.js · MediaPipe

Source ↗Live demo ↗

Browser game

Dudu finds Bubu

A 3D exploration game with pathfinding, touch controls, weather, and procedural Web Audio.

JavaScript · Three.js · Vite

Source ↗Live demo ↗

02 / experience

From features to ownership.

View résumé PDF ↗
git log --career
  1. May 2025 – Present

    Spacez Pvt Ltd

    Software Development Engineer 1 · Bengaluru

    Contribute across Spacez and Spacez PMS (Product Management Systems), with end-to-end ownership spanning 55+ PMS modules, architecture, backend services, web interfaces, the shared design system, and the caretaker Android app.

    • Developed PMS workflows across bookings, calendar, pricing, operations, issues, media, and communications, with per-section access controls and owner/franchise portals.
    • Built the shared design system and delivery checks, plus the Capacitor Android app with FCM push and delivery auditing.
    • Delivered consumer booking, add-on purchase, pricing/coupon, and analytics workflows alongside the Spacez website redesign.
    • Built wallet webhook ingestion and reconciled seven spend sources into one ledger, separating cash movements from actual spend.
    • Shipped invoicing and AI-assisted bill verification using OCR and the Claude API, with per-document caching.
  2. Jan 2025 – Nov 2025

    One Team Solutions Edtech Pvt Ltd

    Freelance MERN Stack Trainer · Kochi

    Delivered industry-oriented MERN training in application architecture, API design, and scalability. Mentored developers on authentication, data modeling, and integrations.

  3. Jun 2024 – Dec 2024

    Auxxweb Solutions

    Associate Frontend Developer · Calicut

    Built EnConnect, a multi-tenant business profile platform with tiered templates, granular role-based admin panels, and a frontend architecture supporting business onboarding.

  4. Jul 2022 – Mar 2024

    Revontulet Solutions

    Full-stack Developer · Bengaluru

    Led frontend/backend redesigns for IndianCashback, reworked data schemas, introduced Redis and Meilisearch, and integrated payment gateways and bank APIs for wallet workflows.

03 / toolkit

The tools behind the work.

Across the interface, the service, and the data.

$ next dev

Frontend

TypeScript, JavaScript, React, Next.js App Router, Tailwind CSS, and Zustand. SSR, SSG, ISR, and shared design systems.

$ nest start

Backend

Node.js, NestJS, Express, Next.js API Routes, and Django REST APIs. Authentication, integrations, and operations workflows.

$ redis-cli

Data & search

PostgreSQL, MongoDB, Firestore, SQL, Redis, and Meilisearch. Data modeling, caching, and search.

$ ledger.reconcile()

Money systems

Razorpay, PayPal, and bank/wallet APIs. Webhook ingestion, invoicing, derived balances, and expense reconciliation.

$ proof.verify()

AI & automation

Claude API, Gemini, OpenAI, OCR pipelines, and Puppeteer. Receipt extraction and document verification with cached results.

$ docker compose up

Cloud & mobile

Flutter, Dart, Dio, Hive, and Capacitor Android. AWS EC2/S3, Docker, GitHub Actions, Vercel, Render, and Firebase Auth/Storage/FCM.

04 / get in touch

Let’s build
something useful.

Open to full-stack roles, freelance work, and product collaborations. Tell me about your team and what you’re building.

karthikk7293@gmail.com ↗
LinkedIn ↗GitHub ↗

Based in Palakkad, Kerala, India

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