12 Ways to Make Code Suck Less
We all have seen our share of bad code and some really good code as well. What are some of the common anti patterns that seem to be recurring over and over in code that sucks? By learning about these code smells and avoiding them, we can greatly help make our code better.
Co-founder & Software Architect @ innoQ, Author of REST and HTTP
Blockchain – The Slowest and Most Fascinating Database in the World
As the foundation of Bitcoin's virtual currency, the blockchain technique is now the starting point for numerous new business ideas. The usual suspects surpass each other with superlatives how "disruptive" the Blockchain based startups will be. In this talk, we look first at the technical foundations and then examine the advantages and disadvantages. We then identify practical scenarios and discuss how to implement them in practice.
CTO @ Endava, Co-author of Software Systems Architecture
Secure by Design – the Architect’s Guide to Security Design Principles
Security is an ever more important topic for system designers. As our world becomes digital, today’s safely-hidden back office system is tomorrow’s public API, open to anyone on the Internet with a hacking tool and time on their hands. So the days of hoping that security is someone else’s problem are over. The security community has developed a well understood set of principles used to build systems that are secure (or at least securable) by design, but this topic often isn’t included in the training of software developers, assuming that it’s only relevant to security specialists. In this talk, we will briefly discuss why security needs to be addressed as part of architecture work and then introduce a set of proven principles for the architecture of secure systems, explaining each in the context of mainstream system design, rather than in the specialised language of security engineering. Our technical examples will be Java centric, but the principles are equally applicable to other technology stacks.
Frontend Development 2018 - What's in Your Stack?
Software Architect, F# Trainer, Author of Domain Modeling Made Functional
Functional Design Patterns
In object-oriented development, we are all familiar with design patterns such as the Strategy pattern and Decorator pattern, and design principles such as SOLID. The functional programming community has design patterns and principles as well. This talk will provide an overview of some of these patterns (such as currying, monads), and present some demonstrations of FP design in practice. We'll also look at some of the ways you can use these patterns as part of a domain driven design process, with some simple real world examples in F#. No jargon, no maths, and no prior F# experience necessary.
Senior Software Engineer, Apache Cassandra Committer
What Every Programmer Has to Know About Database Storage
In the world of Big Data, it’s important to know how the Database Storage works in order to be able to pick a right tool right job. The talk covers evaluation techniques, to choose storage with best read, write or memory overhead, best suitable for your data. This information will help you to navigate the world of databases and stream processing engines, each of which uses a specific storage type or offers multiple different possibilities. You will gain understanding the trade-offs different Storage types bring as you scale out your data and plan for growth.
Software Craftsman, Co-Founder, Developer @ Codeborne
Kotlin in Real Projects: Pragmatic Opinion on Pragmatic Language
Kotlin is a marvelous JVM language that many have waited for. While we already have Java 8 and some people have migrated away from JVM while waiting for a more productive language, Kotlin finally is here, promising lots of good stuff, but still allowing us to use the cross-platform and highly optimized JVM and many of familiar frameworks. However, nothing comes without drawbacks. There have been some controversial decisions while designing the language that affect what is convenient to do in the language and what is not so. Moreover, Kotlin is yet to deliver many of its promises, like compilation speed. In this talk I'll talk about real life experience of using Kotlin in an Agile way, the obstacles that you may encounter and how to overcome them.
Does TDD Really Lead to Good Design?
"TDD is a design tool." That’s what Sandro has said for years. But not anymore. After working with different teams and in different organisations, and also carefully inspecting how he works, Sandro changed his mind about the role of TDD in software design. In this talk Sandro will explain the pros and cons of the two main styles of TDD when it comes to software design, he'll discuss why some developers can test-drive well-crafted code while others can’t, and he'll also explain how to reason about design decisions.
The Way of a Jedi: How to Get Started
There are huge amount of different techniques and methodologies of self-organisation and personal effectiveness. However, most of them are flawed, because they do not take into account that the world is unpredictable, people are different and “knowing how to be effective” and “being affective” are not quite the same thing. In this talk, Maxim will show not “yet another personal effectiveness methodology” but the methodology that may help you to build your own one. Be ready to become more productive after this talk!
Systems Architect, Co-organiser of London .NET User Group
Real World REST and Hands-On Hypermedia
So you've built your HTTP API, and now that it's live, you're suddenly dealing with a whole new set of problems. Do you really need to PUT the entire Customer just to change someone's email address? Why does it take you 25 API calls just to render a shopping cart? How do you find the bottlenecks when just drawing a web page requires fifty HTTP requests? What happens when one of your API consumers accidentally tries to GET your entire customer database? Most of us are familiar with the architectural style known as REST, but even experienced developers often find it difficult to translate REST's architectural principles into running code. In this talk, we'll explore the elements of REST related to hypermedia and the principle of "hypermedia as the engine of application state" (HATEOAS) - we'll talk about why they matter, and when you might want to implement them in your own systems. We'll look at some of the tools that exist to help you design, deliver and debug your HTTP APIs, and we'll do some hands-on coding to show you what these patterns look like in a .NET web application using the HAL hypermedia application language.
Technology Evangelist @ Atlassian
The Secret Sauce of Successful Teams
Every software team writes code, but some teams produce fewer bugs than others. Every software team creates new features, but some teams develop features users love and others don't. What do high performance teams do differently, and why are team members more focused, satisfied and relaxed? They truly work together. No 10x programmer can achieve what a well rounded, enthusiastic team can. Sven Peters, Technical Evangelist, will examine how the best software teams set and follow goals, integrate new members fast, ensure diversity, monitor and continually improve team health, embrace transparency, use a playbook to guide them through every phase of development and much more! He shares techniques including: bugfix rotations, OKRs, feature buddies, open demos, focus days, sanity checks and many more that help teams and team members to work more effectively together, and produce awesome results.
Trainer, Team Leader @ Allegro Group, ex-Head of Software Development @ 4Finance
Making Your Tests Rock in Just 45 Minutes
I’ve been using TDD/BDD at work for the last 12 years, I also teach and mentor teams on this subject. I’ve found that misconceptions and errors in this field are shared, and that most of us make the same mistakes. Give me 45 minutes of your time, and I’ll try to address the most common problems, hoping to improve your TDD/BDD situation as much as possible. I’ll try to solve: long running tests problem, by bringing back the correct shape of test-pyramid with power of Hexagonal Architecture (Ports & Adapters) with practical examples in Spring, miscommunication and lost art of requirement gathering, by focusing on readability, introducing just enough of Domain Specific Language, and sorting out what is important with the power of Spock, difficult test setup and environment requirements, by using command and conquer, modularity, monitoring, mock abuse, by showing what are the benefits of in-memory implementations, and hopefully more. Most teams that do not write tests first do it, because it’s hard for them. I’ll try to show you, how to make it easy. Real life examples included. If you are not using TDD/BDD, this might also interest you - you’ll know how to start the right way.
Independent Consultant, Domain-Driven Design and Event-Sourcing Expert
The Pillars of Domain-Driven Design
Domain Driven Design is neither a method nor a technology, it is a culture, a way of thinking about the needs of the customers first and putting an emphasis on their language and human interactions. The promise of DDD is to tackle complexity in the heart of software, and the means are plentiful and can be overwhelming. There are three pillars though, on which the whole approach stands. A focus on learning, language and empathy. With the right mindset it becomes simple to derive good models, keep them pure and aligned with the business. Simple is not easy, but done right Domain Driven Design transforms everything in your organisation from code to culture, from agile to architecture.
The Economics of Software Design
Every month, someone new asks me the question, "How do I convince my manager to let me refactor?" While it's true that a manager shouldn't constrain the programmer's plans to deliver high-quality code, the fact remains that some organisations allow their managers to assert this level of micro-control. In this talk I outline a set of models for justifying evolutionary design with basic economic concepts that relate directly to delivering, planning, and funding software projects. This talk will provide you with a solid argument to meet any skeptic's rational objections to writing tests first and letting both low-level design and architecture emerge.
Principal Architect @ Senacor Technologies
Elixir — Easy Fun for Busy Developers
Did you ever want to create an application that is never down? Have you ever been jealous of those Erlang guys, that produce applications that practically never fail? Have you tried Erlang and fled because of its baroque syntax and tooling? Enter Elixir! Elixir combines Ruby's love for programmers with the absolute power that is the Erlang platform. This talk will introduce programmers to Elixir and OTP. You will gain an understanding of what Elixir brings to the table and how to build highly scale-able systems with a toolset that is actually fun to use. Even if you will never use Elixir and OTP for you projects, you will learn some of the concepts, that make Erlang into such a powerful ecosystem.
Software Engineer in the Applied Machine Learning Group
Client-side Machine Learning
Machine Learning (ML) and Artificial Intelligence are becoming ubiquitous in websites, chatbots and mobile apps. While Node.js may not be the language of choice for building and training ML models, it is an excellent option for building the user-facing server layer that brings ML product to life. In this talk you'll learn about the ways that Node and ML can work together, whether it’s through running ML models in the browser (using WebAssembly and WebGPU) or writing a node server for an ML chatbot.
High-performance & Low-latency Computing Consultant, ex-CTO of LMAX, creator of Aeron
Designing for Performance
What does it really mean to design software for high-performance? Performance is such a generic and misunderstood subject. In this talk the subject of software performance will be explored. We will focus on what is means to achieve sufficient response times, throughput, and scalability. Once the theory is out of the way we will dig into how modern hardware works and what we need to know about abstractions mapping to our software designs. These abstractions are the key to the models our code represents. The author has not meet many abstraction layers he did not enjoyed violating. There is a good reason for this. So many of our abstractions are leaky or just plain wrong.
Director, Global Innovation Microsoft RD & MVP
Mixed Reality Development and Best Practices
The year 2018 is the year of Mixed Reality with devices like the Microsoft HoloLens which are turning science fiction movie technology into reality. It’s an amazing time to be a developer and to be part of the fourth industrial revolution where XR is dramatically changing work processes. Rene will demonstrate some of the HoloLens projects he and his team worked on since 2015 and share how they were able to overcome challenges. His best practices and recommendations will help you avoid pit falls and might provide inspiration for your next XR projects. He will also provide you with a future perspective of Mixed Reality combining AI + MR using Windows Machine Learning in Unity.
Technology Architect, Developer Advocate @ Google. Creator of @JDeferred library
Deploying & Managing Microservices with Containers and Kubernetes
A quick overview on Docker containers, usages, and how to scale up from a single container to a fleet of containers working together with Kubernetes for real-life workloads, such as running java-based applications! Join this session to see how to use Kubernetes to launch, manage, and rolling-upgrade a fleet of Java application instances with session replication. Kubernetes builds on top of Docker to construct a clustered container scheduling service. Kubernetes enables users to ask a cluster to run a set of containers. The system will automatically pick worker nodes to run those containers on, which we think of more as “scheduling” than “orchestration”. Kubernetes also provides ways for containers to find and communicate with each other and ways to manage both tightly coupled and loosely coupled sets of cooperating containers. In this session, you’ll learn: how to containerize different Java-based microservice workloads using Docker and different build tool plugins, deploying and managing a fleet of Java-based microservices in Kubernetes, service discovery 101 in Kubernetes, how to perform critical DevOps steps, such as canary, rolling update, roll backs, and some tips and tricks!
Don't Walk Away from Complexity, Run!
Complexity hurts. We find it everywhere, in our daily lives, in products, and in the code we have to maintain as developers. Complexity comes in different forms and flavors. The ways in which complexity can manifest is, well, complex. In this keynote, an award winning author and software practitioner will share experiences and observations from working on multiple software projects, about what leads to complexities, the traps developers and organizations fall into, and what we can do to effectively deal with these common, recurring issues we see across domains and products.
We all have legacy code, meaning profitable code that we’re afraid to change. It doesn’t matter who wrote it, in which language, nor when. It matters that we feel the fear now and need to deal with it. Rewrite or refactor? How do we write tests? There’s so much to change; how do we get started? In the typical programmer’s day job, there’s no time to learn how to do this. We’re already behind schedule and the cost of fixing the legacy code is crushing us. We need a way to learn how to do this safely, correctly, and eventually, even quickly. That’s what Surviving Legacy Code is about.
We will work in short sessions on a diabolical-but-fun code base (available in at least 20 programming languages), practise micro-committing, a key technique to changing difficult code safely, practise a handful of refactoring and testing exercises that develop the most essential legacy code rescue skills and disciplines.
Amazon Web Services (AWS) is the world's leading provider of reliable, scalable, and inexpensive cloud computing services. The goal of this intensive, practical training is to familiarise you with the core AWS services and equip you with enough knowledge so you can choose, create, configure and maintain AWS infrastructure for your own projects.
| Juris Pavlyuchenkov
Trainer, Amazon Certified Solutions Architect
After this course, you'll gain deep understanding of AWS, learn how to operate production-grade AWS infrastructure and discover hidden tips and tricks from a certified AWS expert..
This workshop is designed for developers willing to learn how to write automated tests that are fast, easy to read and fun to maintain.
Are you beginning your TDD and BDD journey or already practicing TDD and BDD? Whatever the case, be ready to bring your tests to the next level!
| Jakub Nabrdalik
Trainer, Team Leader @ Allegro Group, ex-Head of Software Development @ 4Finance
Ready to bring your tests to the next level? Bring your own laptop, and let's start coding!
This practical workshop will equip you with necessary skills for accomplishing more, with less stress and efforts, and bring you closer to the work-life balance on a win-win basis. After the training, you will know how to achieve more at work and personal life simultaneously (instead of conventional view: “one at the expense of another”).
More than 50% of workshop time is devoted to practice, exercises and discussions. The workshop offers concrete, ready-to-use improvement recipes for daily work.
This course is designed to get you familiarised with the basics of AWS Lambda and the Serverless framework quickly, and then deep dive into the operational challenges with running a serverless architecture in production and the emerging patterns and practices to tackle them.
This is a hands-on course where we will build a simple e-commerce site from scratch, using a number of services in the AWS ecosystem including (but not limited to) Lambda, API Gateway, Kinesis and Cognito User Pools.
| Yan Cui
Developer, Software Architect, Trainer, Author of AWS Lambda in Motion
Bring your own laptop, open an AWS account, and install VisualStudio Code and the Serverless framework and let's get you ready for running a serverless architecture in production!
This course is designed to help developers get better at Test-Driven Development and write well-crafted code—code that is clean, testable, maintainable, and an expression of the business domain. The course is entirely hands-on, designed to teach developers practical techniques they can immediately apply to real-world projects.
Software Craftsmanship is at the heart of this course. Throughout, you will learn about the Software Craftsmanship attitude to development and how to apply it to your workplace.
Once you have an understanding of the principles at work, we will apply them to Legacy Code to help you gain confidence in improving legacy projects through testing, refactoring and redesigning. The course is fully hands-on and developers will be writing a lot of code.
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The National Library of Latvia also known as Castle of Light is a stunning national cultural institution, that plays an important role in the development of Latvia's information society, research, and education.
With a stunning view on Riga Old Town and river Daugava, Castle of Light is designed from scratch specifically for unforgettable choral, chamber, and acoustic music experience, and is a perfect location for DevTernity.
National Library of Latvia, Mūkusalas iela 3, Riga, Latvia