Platform Scaling from ~100K to 1M+~ concurrent users. | CoderTrails

Platform EngineeringAWSMicroservices

Platform Scaling from 100K to 1M+ concurrent users.

A leading online education provider was hitting the ceiling of a legacy monolith. We engineered the migration to microservices on AWS with zero service interruption.

Timeline

8 months

Scope

Full re-architecture

Role

CoderTrails-led

Outcome

1M+ users · 99.9%

CoderTrails

30, Jun 202610 min read

Read summarized with

The Challenge

A leading online education provider was facing critical scalability challenges with their legacy monolithic platform built to serve 50,000 students, now struggling with 500,000+ users.

Performance Issues

8+ second page load times
40% user drop-off rate
Frequent downtime during peak hours

Database Bottlenecks

Single monolithic database
No read replicas or caching
Query timeouts during exams

Deployment Challenges

72-hour maintenance windows
Manual deployment process
No rollback capabilities

The Approach

CoderTrails conducted a comprehensive architecture assessment and developed a phased migration strategy to modernize the platform while maintaining continuous service availability.

Microservices Architecture

Re-architected the monolithic system into 12 independent microservices, including separate services for authentication, course delivery, assessment engine, and analytics.

Database Optimization

Implemented database sharding and read replicas, migrated session data to Redis, and introduced caching layers reducing database load by 75%.

CI/CD Pipeline

Established automated deployment pipelines using GitLab CI with comprehensive testing, enabling multiple daily deployments with automated rollback capabilities.

The Outcome

The modernized platform now delivers exceptional performance and reliability, enabling the client to expand into new markets with confidence.

Concurrent Users

100K

1M+

System Uptime

97.2%

99.9%

Infrastructure Cost

Baseline

60%

Technology Stack

Frontend

React
TypeScript
Redux

Backend

Node.js
Express
GraphQL

Database & Caching

PostgreSQL

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