nm.Nilanjan Mandal
Let’s talk

FULL-STACK ENGINEER · INDIA

Hey, I’m Nilanjan

Thoughtful code.
Useful things.

I turn complex problems into web and mobile experiences that feel simple. From the first interaction to the systems behind it.

Explore my work Download résumé
GitHub LinkedIn
A LITTLE HUMAN
BEHIND THE CODE.NM / 26
Nilanjan Mandal
West Bengal, IndiaWEB · MOBILE · SYSTEMS
Building across web & mobile.

EXPERIENCE AT 23 Ventures+StepOut

A few things I’ve worked on

01 / SELECTED WORK

Built to solve
something real.

A few projects where thoughtful interfaces meet the engineering underneath.

23 VENTURES · WEB APPLICATION

From raw data to ready-to-train.

An image-annotation workspace connecting dataset uploads, precise labeling, training configuration, and model evaluation.

ReactTypeScriptTanStack QueryAWS S3
My contribution

Annotation Platform / TrainingObjects

  • Resumable multipart uploads with concurrent transfers, retries, and signed-URL renewal.
  • Bounding-box editing with drawing, resizing, coordinate transforms, zoom, pan, and keyboard controls.
  • YOLOv8 dataset preparation and training interfaces, including augmentation, data splits, compute selection, and evaluation metrics.

23 VENTURES · MOBILE PLATFORM

Four identities. One foundation.

A shared mobile platform for four branded apps, bringing real-time games, rewards, and location-based experiences together.

React NativeExpoTypeScriptWebSockets
My contribution

Social Change — Mobile Platform & Admin

  • Reusable product logic, configurable experiences, and brand-specific themes across four apps.
  • BLE beacon and GPS geofencing workflows with background tracking and signal-loss recovery.
  • Admin tools for venues, campaigns, rewards, wallet oversight, and bulk redemption decisions.
  • Automated branded iOS builds using Expo EAS and native project configuration.
BUILT ON MY OWN TIMEMore on GitHub
Flixr application interface

YOUTUBE WORKFLOW AUTOMATION

Flixr

From an editor’s upload to an admin’s approval to a published video. A simpler workflow for content teams.

Next.jsExpressPostgreSQLRedis
Frontend source Backend source
Kaigi application interface

REAL-TIME COLLABORATION

Kaigi

A space to talk, sketch, and work together, with peer-to-peer video, live messaging, and a shared whiteboard.

Next.jsFastifyWebRTCSocket.IO
Frontend source Backend source

02 / THE JOURNEY

A little context.
A lot of building.

Working across product interfaces, mobile experiences, and the infrastructure that makes them reliable.

The full résumé
23 Ventures logoSEP 2024 — OCT 2026

23 Ventures

Member of Technical Staff · Remote, India

Built web and mobile products across Social Change, TrainingObjects, and CryptoApe / FutureApe.

  • Shared React Native / Expo experiences across four branded applications.
  • Annotation, dataset preparation, and model-training interfaces.
  • Real-time trading competition workflows, portfolio rebalancing, and live rank notifications.
React & Next.jsReact NativeAWS
StepOut logoNOV 2021 — MAY 2024

StepOut

Software Engineering Intern · Remote, India

Improved upload, payment, analytics, and mobile workflows for a sports performance analysis platform.

  • Multipart video uploads and AWS Lambda / Playwright document workflows.
  • Razorpay payments, Mixpanel and GA4 instrumentation, multilingual support, and over-the-air updates.
React NativeNode.jsAWS Lambda

03 / BEHIND THE CODE

Curious by default.
Engineer by craft.

I’m Nilanjan, a full-stack engineer based in West Bengal, India. I like getting into the details: how an upload recovers after a dropped connection, how a drawing tool handles a zoom, how four apps can share one solid foundation.

My work spans the interface and the systems behind it. I care about clear interactions, maintainable code, and making complicated things easier to use.

B.Tech in Information Technology

RCC Institute of Information Technology, Kolkata

Class of 2024 · CGPA 8.37

MY EVERYDAY TOOLKIT

Web & interfaces

React, Next.js, TypeScript, Tailwind CSS, TanStack Query, Zustand

Mobile experiences

React Native, Expo, Expo EAS, Fastlane

Behind the scenes

Node.js, Express, PostgreSQL, Redis, REST APIs, WebSockets, FastAPI

Shipping & infrastructure

AWS S3, Lambda, EC2, Amplify, Docker, GitHub Actions, Turborepo, Bun

Also comfortable with JavaScript, SQL, Python & Go.

04 / WHAT’S NEXT?

Have something
good in mind?

A product to build, a tricky problem, or just a hello.
I’d love to hear from you.

nilanjanmandal15@gmail.com
Email me GitHub LinkedIn