We're a data-driven company. At trivago we love measuring everything. Collecting metrics and making decisions based on them comes naturally to all our engineers. This workflow also applies to performance, which is key to succeed in the modern Internet.

When I joined trivago a year ago we had problems with our releases. Read how we were able to switch from our bash release process to a new one.

How accessibility came from being neglected to being an important part of what we do at trivago

Sometimes advertisements just have to be bold. Especially when your goal is to hire creative thinkers, why not give them something to... think about!? That was our goal when we planned a new marketing campaign for Software Engineers.

At the end of August 2017, ten students set foot in the trivago headquarters in Düsseldorf to be part of the first ever trivago Tech Camp. Two weeks were packed with real-world challenges, guest lectures, Q&A sessions, and tons of other opportunities to learn. In the end, a lot of working software w...

trivago will host a PHPUnit Code Sprint in mid-October to support this crucial part of the PHP ecosystem. Sebastian Bergmann, the creator of PHPUnit, will be there to coordinate the developers' efforts and to answer questions.

trivago has decided to sponsor Webpack with a monthly contribution of $10,000 ($120,000/year). We hope that this will help to secure the continued innovation of the project.

Our first [right-to-left platform](https://www.trivago.co.il/) was released in 2014. We had developed a solution to generate right-to-left CSS with Sass mixins and variables as we have [described](https://tech.trivago.com/2015/04/27/right-to-left/) in a blog article. We used this approach for nearly...

Running Cucumber scenarios in parallel can be tricky, especially when a custom test runner is used. That's why we created Cucable - a Maven plugin to split test scenarios into smaller chunks that can be run at the same time.

We, Marcos Pacheco and Marcus Tannerfalk, work as Agile Coaches in the Palma office for the hotel search company trivago. This is our experience in working with a development team in daily sprints with the goal of delivering an MVP (minimum viable product)

At trivago we use Jenkins as our main CI tool. However, when our physical setup was not enough we needed to move it to the cloud and implement an automated slave scaling. This is the definite guide with all the steps we took to implement an auto scaling Jenkins platform.

Concepts like separation of concerns, logic decoupling or dependency injection are things we developers have heard more than a couple of times. At trivago, the Android app is developed using the Model View ViewModel (MVVM) architecture, aiming for views as dumb as possible, leaving the decision maki...

For our products, like the trivago [hotel search](https://www.trivago.com/), we are using [Redis](https://redis.io/) a lot. The use cases vary: Caching, temporary storage of data before moving those into another storage or a typical database for hotel meta data including persistence. The main parts ...

At trivago we have been using code reviews as a part of our process for a good while now. In the beginning they weren't used by many teams but as word of their positive impact spread, more and more teams started adopting this practice, benefiting every day from its many advantages. Like any new prac...

While rolling out our brand-new JavaScript framework to the trivago Hotel Search, we started the largest teaching initiative that our dev department has seen so far. 40 developers, many workshops, many screencasts, some newly discovered teaching talent, some frustration, a lot of puzzle pieces. Read...

It has been about a year since we introduce the idea of guilds in trivago Software Engineering department in Düsseldorf. Here we share some of our learnings with it.

Configuration management tools have recently gained a lot of popularity. At trivago we use SaltStack to automate our infrastructure. As the complexity of configuration files and formulas is increasing, we need a fast, reliable way to test our changes.

Around a year ago, in our large scale refactoring project also known as Project Ironman, we stepped away from image sprites that we used for our icons. In this post we will explain our reasoning behind this decision and how it improved maintainability and website performance.

When thinking about design patterns and architectures in iOS development, MVC might be the first thing that comes to mind for most of you. But throughout the last years, MVC got a really bad reputation. Probably a lot of you heard about MVC as the massive view controller.

We've prioritized the resources that our users need to load and gained an impressive boost on our JavaScript application startup. In this article, I will explain how we've used Webpack, adjusted our handling of SVG icons and prioritized user needs to achieve up to 4.5 times faster startup.

With engineers spread across four offices, collaboration and communication in trivago's IT is a challenge. Additionally, new engineers join the company all the time, which makes it even harder to figure out who to talk to about certain products, packages, and technologies.

At trivago we are building and using a Pattern Library which is based on Brad Frost's Pattern Lab adapted to our needs; our patterns are written in Twig. This Pattern Lab is based around Brad's Atomic Design, which is also something that we are embracing.

When people hear about dropping support for a certain Internet Explorer version, they mostly think of all the CSS hacks and workarounds that could be removed as a consequence. However, dropping support for IE8 can have subtle, but profound effects on your JavaScript.

How can we organize the collaboration of more than a hundred developers on a wide range of topics? How could they decide about good practices in the company? Those are some questions that drove trivago to give it a try on a different structure: the guilds.

At trivago we store a subset of our realtime metric data in InfluxDB and we are quite impressed by the load it can handle. Despite all the joy, we had to learn some lessons the hard way. It is pretty easy to overload the database or the web browser by executing queries that return too many datapoint...

While our company and our application were constantly growing, we often ran into some consistency issues between code and design. Because we didn't have a design/frontend system and development guidelines to follow, our UI became cluttered and unsustainable.

At trivago we rely heavily on the ELK stack for our log processing. We stream our webserver access logs, error logs, performance benchmarks and all kind of diagnostic data into Kafka and process it from there into Elasticsearch using Logstash.

When publishing a JavaScript library, we usually want to make it available to as many people as possible to maximize the library's usefulness and adoption. In that respect, it can be helpful to users to have the library available in their preferred module format - CommonJS, AMD, ES6, etc.

When using webpack to build your assets, it's only a matter of time until you wish for targeted builds. Whether it's the output of the library you're working on (CJS, UMD, AMD, Var, etc.), or the specific feature set (IE8 support, no IE8 support). parallel-webpack can run those builds in parallel.

One of our core values at trivago is fanatic learning. Twice a year, the trivago software developers gather to have a 2 day internal hackathon. This December saw another round of ambitious creativity, relaxed atmosphere, and good food.