Real-time leaderboard on AWS, built so the database ranks every player itself with zero sorting at read time.
Fantasy soccer reranks 11 million players within minutes of the final whistle, and the usual answer is Redis: a cache to babysit, a cluster to pay for, one more thing to fall over at 2am. We skip all of it. In this build the scores are born sorted, one clever DynamoDB sort key does the whole ranking, and the serverless half costs nothing when nobody is playing. Live boards, daily and weekly rankings, percentiles, and history, all from two tables and five small functions.
In the labs you get five focused mini-labs, one each on IAM, DynamoDB, Lambda, API Gateway, and EC2. Then a capstone in a real AWS account where you build this exact system and watch your own leaderboard sort itself.
? Build the whole leaderboard yourself in the free lab: https://kode.wiki/4wYoXP6
? What you'll learn:
1️⃣ The inverted sort key trick that makes DynamoDB return the ranking already ordered, so reads never sort anything
2️⃣ How one global secondary index plus five small Lambda functions run the whole engine: submit, query, stats, snapshot, simulate
3️⃣ Fronting it with API Gateway and serving a live dashboard from EC2, logged end to end by CloudWatch
⏰ Timestamps :
00:00 - The Leaderboard Ranking Problem
01:00 - Architecture of Real-Time Leaderboard on AWS
06:45 - Free hands-on Labs
07:10 - Wrap up
☁️ Full AWS Playlist: https://www.youtube.com/playlist?list=PLPOrzEadD7Ew
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