--- title: "Nobody Got Fired for Uber's $8 Million Ledger Mistake?" url: https://daily.dev/posts/nobody-got-fired-for-uber-s-8-million-ledger-mistake--echuhzllt source_url: https://news.alvaroduran.com/p/nobody-got-fired-for-ubers-8-million type: article source: "The PayEng Playbook" published: 2026-04-20T13:19:13.728Z updated: 2026-04-20T13:24:11.942Z tags: ["career", "fintech", "aws-dynamodb"] reading_time: 10 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Nobody Got Fired for Uber's $8 Million Ledger Mistake? **[The PayEng Playbook](https://daily.dev/sources/alvaroduran)** · 10 min read · 0 upvotes · 0 comments ## Summary Uber's LedgerStore, built on DynamoDB in 2017, is widely cited as a system design success story — but it was actually abandoned within 2-3 years due to prohibitive costs. With 11 million daily trips generating hundreds of millions of writes, the consumption-based pricing of DynamoDB led to an estimated $8 million bill. The post argues this was a foreseeable failure driven by bad incentives: engineers optimizing for promotions rather than sound economics. The migration to an internal DocStore-based system required building additional tooling (CDC streaming framework 'Flux'), compounding the waste. The author criticizes both Uber for presenting this at AWS re:Invent 2019 as a case study, and publications like ByteByteGo for continuing to praise it without examining the full cost picture. The core lesson: technical requirements alone are insufficient — cost modeling must be part of system design decisions. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#career](https://daily.dev/tags/career), [#fintech](https://daily.dev/tags/fintech), [#aws-dynamodb](https://daily.dev/tags/aws-dynamodb) [View this post on daily.dev](https://daily.dev/posts/nobody-got-fired-for-uber-s-8-million-ledger-mistake--echuhzllt)