Experience
DEV DAY on May 26, 2018
in Berlin and Faro

CLI Applications with Symfony Console: the PHP developer’s “bash” script
Christopher Hertel

Console applications - whether as part of a larger (Symfony-) application or as standalone tools - are a PHP developer’s “bash-script”. Many often leave the path of clean code and instead hack pragmatic solutions despite the fact that a lot of them need regular maintenance and stay in the source for a long time. This talk shows examples for reasoning about pragmatic approaches and contains simple tricks that help cleaning up your code from “how do I decouple my code from CLI runtime?” to “how do I optimize long running processes?”

Things Every Developer Absolutely, Positively Needs To Know About Database Indexing
Kai Sassnowski

This talk dives deep into a topic that, sadly developers don’t know enough about: database indexing. Indexing is much more nuanced than throwing an index at every column in your WHERE-clause and hoping that it sticks. Since poor query performance can be the difference between an application feeling snappy and being literally unusable, it is imperative that we as developers know how to properly index a database.

We will take a look at how indexes work internally, common pitfalls when designing indexes and what all of this means for us in practice.

After this talk you will be well equipped to create well-designed indexes and confidently debug slow queries in your applications.

Building Fast Websites Against All Odds
Ryan Townsend

Fast website performance is essential for a great user experience, particularly in rural areas or emerging markets where poor connectivity and low-power devices can struggle with even the most optimised sites, yet it can still seem impossible to convince clients and stakeholders of the value that performance holds.

Now, I can’t promise that I can magically transform your clients’ attitudes toward performance, but what I can do show is show you how to build a fast website without even involving them. In my work delivering high-performance, high-availability websites for some of the UK’s biggest retailers, I’ve come up with a wealth of ways in which we as front-end developers can improve performance – we'll be learning how you don't need AMP, other costly rewrites, new infrastructure, or any kind of work that requires permission (and budget!) to compete alongside the big sites.

We may not be able to make the _fastest_ website without permission, but we can certainly make a fast one!

The Whole Story about Orchestration and CI with Openstack, Kubernetes and Gitlab
David Sauer, Sys11, Hermann Fries

Confidently deploying with GitLab CI and kubernetes

Using automated builds, tests and deployments saves time and nerves. In this talk, we will show you how we have adopted GitLab CI and Kubernetes to stop worrying and deploy with confidence.

Civic Tech: Beyond The Talk Who's Up For The Walk?
Jorge G Coelho & Inês Boski

However skilled the developers are besides their focus on business and personal objectives, climate change and a growing need of accountability of public services is making emerge a sense of urgency, leading citizens to act upon the most mundane aspects of everyday life. Nowadays, with the range of tools at our disposal and higher distribution of skills, technologists are a key actor in accelerating the change we need to see: making tangible where the market renders expensive and stuck to roadmap powerpoints; making available working solutions where government is rendering complex and bureaucratical.

Adjacent to the sense of urgency is the need to enable processes that can take-on creative problem solving, with a focus on human needs and in an environment where collaboration can thrive, regardless of skills, background and experience. Going beyond the state-of-the-art, this presentation aims to take the Civic Tech theme a step forward and contribute towards sparking a local community of practices that could build on previous experiences in Berlin and make them touch ground in Faro.

As a concrete example of civic tech, Inês Boski's talk will focus on presenting Fénixhack, a campaign-hackathon project for developing solutions to wildfire management. "How to mobilize people behind (tech) solutions development?" and "Is tech a strong prospective ally of the better wildfire management cause?" will be just some of the questions this talk will aim at raising.

More information on the project: fenixhack.org .

AWS Lambda
Lev Stejngardt

This talk gives a practical introduction into the main concepts of AWS Lambda explained along the popular quiz game “Denk-Fix”. Additionally we’re going to demonstrate how Lambda functions can be integrated with theAWS services DynamoDB and S3.

Fight Club: Clean Code vs. Dirty Code
Philippos Kardaras, Daniel Speckhardt

PHP developers live in a brave new world: in times of conventions over configurations, fullstack frameworks, SOLID principles, dependency injected services, CI-pipelines, docker containers, Vagrant boxes, automated testing and rolling deployments, package managers and SCRUM processes the amount of skills needed to develop web apps grows with O(n^2). Everything gets more complicated, takes more time and adds costs for the client. Do you sometimes wish back the old times of “dirty” coding and plain FTP upload hacks onto the live server? Who are the winners and the losers of this development? Is the growing effort really worth it? Clean-Phil and Dirty-Daniel try to answer these questions and present their points of view with examples, live coding and a lot of humor. Who will win that match? You decide!

Enable highend SPAs using REST-APIs with Symfony 4 Flex
Denis Brumann

Nowadays it is becoming more and more common to have a Single Page Application-frontend that is powered by JavaScript, e.g. using React, Angular or Vue, and your PHP-application solely providing a RESTful API for it. Using Symfony 4 and Flex it is easy to setup your Symfony application for this purpose and build an API that is solely dealing with JSON data. In my talk I want to give an outline on how to manage a project made up from separate frontend and backend, focusing on how to prototype a basic Symfony API-application from scratch. The aim is to teach you what most API-centric bundles are doing under the hood to better grasp how to extend or modify them and how to debug problems.

Empowering 20 Million Creators with Machine Learning
Ramzi Rizk

The founders behind the photo community EyeEm never thought they’d one day see over 20 million creators on the platform. With such a large pool of photographers comes an influx of imagery, which poses an important question for the EyeEm team: How do we separate the noise from the quality photography?

The team at EyeEm is working on technology to organize images based on their aesthetics - and train this technology to understand specific brand style or individual taste, personalizing the image search process to results are truly relevant to what the searcher wants.

In his talk, Co-Founder & CTO Ramzi Rizk will share the story of EyeEm, the unique technology behind it, and the challenges he and his team face in building the tech powering the platform.

Your Monolith, Elixir and You
Tobias Pfeiffer

Elixir is great, so clearly we'll all rewrite our applications in Elixir.

Mostly, you can't and shouldn't do that.
This presentation will show you another path.
You’ll see how at Liefery, we started with small steps instead of rewriting everything.
This allowed us to reap the benefits earlier and get comfortable before getting deeper into it.
We’ll examine in detail the tactics we used to create two Elixir apps for new requirements, and how we integrated them with our existing Rails code base.

Micro Frontends with React and Redux
Alexandra Strekalova, Prasanna Venkatesan, Matthias Laug

Alexandra, Matthias, and Prasanna have been working on a project with micro frontend architecture for the past year.

This project involves 4 teams distributed over two countries - Germany and India, each of the teams delivering one or several micro frontends that are consolidated into one product in the browser.

This talk is based on our practical insights into micro frontends using React and Redux. We will discuss the differences between this technique and micro-services, our approaches in solving the common issues, the advantages it offers and the challenges it brings.

Your New Superpower Has a Name: Redis
Elena Kolevska

You've probably heard of Redis, the lightning fast in-memory data structure store. You might have cached some things in it, you might have even come to prefer it over Memcached.

But do you know all its hidden superpowers? Do you know how gracefully it could handle many of the pain points in your day-to-day developer life? In this talk we're going to roll up our sleeves, take public data from the Twitter API and use the awesomeness of Redis and its different data structures to build an app that does sentiment analysis on it for any brand, person or topic. In this talk we're going to roll up our sleeves, take public data from the Twitter API and use the awesomeness of Redis and its different data structures to build an app that does sentiment analysis on it for any brand, person or topic.

Illuminate console applications with Laravel Zero
Nuno Maduro

While it's fun to write little one-off utility scripts, sometimes you need to write real console apps. One that takes arguments and plays nicely with UNIX conventions for input, output or error reporting. In this talk, we will be using Laravel Zero (http://laravel-zero.com), a micro-framework that leverages an unofficial and customized version of Laravel to provide an elegant starting point for your console app. You’ll learn about the philosophies and ideas behind the framework. We’ll also cover the most important features of Laravel Zero, such as the optional installation of Laravel Eloquent, the usage of Laravel Scheduler or the integration with Collision. This talk will include a 20 min live-coding session, where you will learn how to leverage Laravel Zero to make console apps with a real practical example. After this talk, you’ll be able to deliver console apps at warp speed. Your console app can be used for any recurring task, such as cronjobs, imports, or other batch jobs. You will be able to leverage Laravel Zero, a micro-framework built on top of Laravel components, to use your favorite features of Laravel to build a structured an elegant command line app.

Bot the pain away! 🤖
Julia Krüger

Maintaining a JavaScript software project, be it open source or not, can be a ton of work. There is the fun work of developing new features , fixing a bug or refactoring a messy chunk of code but those are always followed by chores like releasing new versions or updating some dependencies. But worry not, there is help out there. I’ll show you the benefits of semantic versioning and some cool bots, such as Greenkeeper and semantic-release, that will do these chores for you!