Online exam and test series platform development
Saksham Jain builds online exam and test series platforms with a server-authoritative timer, answers held in Redis, auto-submit at the deadline, double-submit protection, chapter-wise analytics and All-India Rank. PS Classes, a pharmacy exam-prep platform for Drug Inspector aspirants, runs on this design.
Works with technology companies, startups and product teams in India and internationally, remotely.
What you get
- Timed test engine where the server, not the browser, owns the deadline
- Sub-second answer saves to Redis, periodically flushed to the database
- Lock against double submits from multiple tabs
- Queue-based scoring worker with incremental rank and percentile rollups
- Course library, student auth and a free-trial to paid access layer
Proof from shipped products
- PS Classes: 200K+ users overall and 1,000+ daily users; designed for 500+ students starting a test series in the same slot, with rank and chapter-wise analytics read from a Redis cache.
How the work runs
- Understand requirements. Business requirements, workflows, edge cases, and user journeys — before any UI or schema gets touched.
- Architect the solution. Database design, APIs, permissions, scalability, and deployment planning, mapped out before a line of production code.
- Build production systems. Type-safe APIs, reusable frontend, optimized backend, and testing — built for real load, not a demo.
- Optimize & ship. Performance tuning, monitoring, documentation, deployment, and maintenance until it's genuinely production-ready.
Stack
Next.js · Node.js · MongoDB · Redis · RabbitMQ
Common questions
How do you stop students from cheating the exam timer?
The server owns the deadline. Each answer is written to a Redis-held session as it is selected, and the server auto-submits the attempt when time is up, whatever the client clock says. Editing the system clock or backgrounding the tab cannot extend an attempt.
How much does it cost and how long does it take?
Indicative ranges for an online exam platform are $650 to $1,900 (about ₹55,000 to ₹1.6 lakh) over 6 to 10 weeks, depending on user roles, workflows, integrations and the deadline. Treat this as a starting point: a fixed quote follows a requirements conversation, before any build starts, so the price reflects real scope.
Related engineering note: How do you build an exam timer students can't cheat?
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