How Infygen Built a Scalable Online Examination Platform

The Challenge

Conducting exams online introduces problems that a normal web app never faces: many candidates start at the same moment, every answer must be saved reliably, and the exam must stay fair and secure.

The platform needed authenticated candidates, strictly timed exams, secure submission, integrated payments, and an admin panel to manage everything — all while remaining dependable during peak exam windows.

Our Solution

Infygen built a full online examination platform with an Angular frontend, a Node.js/TypeScript backend, PostgreSQL for data and AWS for infrastructure.

The system covers the entire journey: candidate registration and authentication, payment, taking a timed exam in a controlled environment, secure answer submission, and results — plus an admin dashboard to manage exams, users and payments.

Key Features

• ✔ OTP / email authentication for candidates
• ✔ Secure examination environment
• ✔ Timer-based exams with reliable auto-submission
• ✔ Online payments
• ✔ Wallet
• ✔ Results and scoring
• ✔ Admin dashboard
• ✔ AWS cloud infrastructure

Architecture

Technology Stack

Challenges & Engineering

• Timed exams and reliable submission: exam timers and answer submission were designed so that a candidate's answers are captured dependably even when many exams run at once.
• Separation of concerns: exam logic, authentication and payments were kept as distinct modules so each can be reasoned about, tested and scaled independently.
• Background processing: slower work (such as generating results and sending notifications) was moved off the request path so the app stays responsive during peak usage.
• Data integrity: payments and submissions were handled with care so records stay consistent — a submitted exam is never lost and a payment is never double-counted.

Results

Screenshots