> Markdown version of [/videos?page=171](https://www.wearedevelopers.com/videos?page=171). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

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# Videos

2223 videos · 24118 moments · 1245.7 hours of content

## All videos

### Advanced Caching Patterns used by 2000 microservices

How do you handle 500 billion daily requests across 2,000 microservices without cascading failures? Discover advanced caching patterns using Kafka, DynamoDB, and Varnish.

- **Speakers:** Natan Silnitsky
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 44:37
- [Watch](https://www.wearedevelopers.com/videos/201-advanced-caching-patterns-used-by-2000-microservices)

### On the straight and narrow path - How to get cars to drive themselves using reinforcement learning and trajectory optimization

Can a car master an unknown track without pre-programmed physics? Discover how Q-learning and trajectory optimization teach autonomous vehicles to drive themselves from scratch.

- **Speakers:** Francis Powlesland, Elena Kotljarova
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 42:18
- [Watch](https://www.wearedevelopers.com/videos/205-on-the-straight-and-narrow-path-how-to-get-cars-to-drive-themselves-using-reinforcement-learning-and-trajectory-optimization)

### Playing Games with CSS

During lockdown, one developer built a pure CSS arcade game without any JavaScript. Discover how to leverage checkbox hacks and CSS counters to master complex skills through play.

- **Speakers:** Elad Shechter
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 44:29
- [Watch](https://www.wearedevelopers.com/videos/210-playing-games-with-css)

### PWA Fundamentals: websites with superpowers

Give your traditional websites native-like superpowers. Master PWA fundamentals from service workers to advanced offline caching. Seamlessly bridge the gap between web and native applications.

- **Speakers:** Rowdy Rabouw
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 43:06
- [Watch](https://www.wearedevelopers.com/videos/212-pwa-fundamentals-websites-with-superpowers)

### Software Security 101: Secure Coding Basics

Are you sacrificing software security for faster release cycles? Discover how to prevent crippling technical debt by mastering foundational secure coding practices and architectural threat modeling.

- **Speakers:** Thomas Konrad
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 1:58:48
- [Watch](https://www.wearedevelopers.com/videos/220-software-security-101-secure-coding-basics)

### Test Driven Development with JavaScript

Tired of manual QA slowing down your deployment pipelines? Master the red-green-refactor cycle with Mocha and Chai to build predictable, well-isolated JavaScript applications.

- **Speakers:** Sascha Depold, Parinaz Roghany
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 1:42:16
- [Watch](https://www.wearedevelopers.com/videos/222-test-driven-development-with-javascript)

### 6 tip to reduce your AWS bill

Are idle instances secretly inflating your cloud costs? Discover six actionable engineering strategies to eliminate AWS money leaks and cut your compute bills by up to 90%.

- **Speakers:** Sébastien Stormacq
- **Event:** World Congress 2021
- **Published:** June 29, 2021
- **Duration:** 45:12
- [Watch](https://www.wearedevelopers.com/videos/159-6-tip-to-reduce-your-aws-bill)

### CQRS and Event Sourcing without the pixie dust

Microservices aren't magic. An event bus alone just creates a distributed ball of mud. Learn how true CQRS and event sourcing achieve genuine architectural modularity.

- **Speakers:** Allard Buijze
- **Event:** World Congress 2021
- **Published:** June 29, 2021
- **Duration:** 43:27
- [Watch](https://www.wearedevelopers.com/videos/163-cqrs-and-event-sourcing-without-the-pixie-dust)

### Jamstack and Web Performance, a match made in heaven

Are legacy origin servers bottlenecking your applications? Discover how Jamstack’s decoupled architecture and build-time rendering instantly resolve backend latency to maximize your core web vitals.

- **Speakers:** Tamas Piros
- **Event:** World Congress 2021
- **Published:** June 29, 2021
- **Duration:** 42:04
- [Watch](https://www.wearedevelopers.com/videos/169-jamstack-and-web-performance-a-match-made-in-heaven)

### Implementing smoke testing and proactive monitoring in production

Are critical user paths breaking silently in production? Discover how automated, end-to-end smoke testing catches regressions instantly before your customers ever complain.

- **Speakers:** Liam Hurrell, Jan Kunzmann
- **Event:** World Congress 2021
- **Published:** June 29, 2021
- **Duration:** 1:29:04
- [Watch](https://www.wearedevelopers.com/videos/171-implementing-smoke-testing-and-proactive-monitoring-in-production)

### How To Test A Ball of Mud

Stop using mocks as painkillers for bad architecture. Learn how to tame your monolithic codebase by enforcing strict test independence and deleting obsolete failing tests.

- **Speakers:** Ryan Latta
- **Event:** World Congress 2021
- **Published:** June 29, 2021
- **Duration:** 42:34
- [Watch](https://www.wearedevelopers.com/videos/173-how-to-test-a-ball-of-mud)

### How not to test 

Chasing 100% test coverage won't save a poorly architected codebase. Discover why over-mocking hides bugs and how prototyping before TDD actually accelerates development.

- **Speakers:** Golo Roden
- **Event:** World Congress 2021
- **Published:** June 29, 2021
- **Duration:** 43:07
- [Watch](https://www.wearedevelopers.com/videos/175-how-not-to-test)

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