By Amin Dorostanian on 10-01-2019
Category: Blog, Development Tags: Kotlin flow design DSL FSM Conversational AI bot
TL;DR: We share our experience on how we built a conversational bot with Finite State Machines. It turned out to have its own shortcomings so we built a DSL to design our flows and called it “Sushi”.
Sushi is a more flexible and straight-forward tool to build complicated flows.
By PBrouwers on 8-01-2019
Category: Blog, Culture, Infrastructure Tags: IT Outage Post-Mortem Retro On Call Peak Season
“It didn’t look like a big issue at that moment”. Everybody in the room listened to what the Engineer on Duty (EoD) had to tell about the first moments what, later on, turned out to be a partly outage of the webshop in peak season.
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By Jeroen Ligthart on 7-01-2019
Category: Blog, Culture Tags: IT Logistics WMS Warehouse
Bol.com is growing with approximately 30% per year, not just in terms of revenues but also operationally. With these increasing numbers it’s an on-going challenge to fulfil all customer orders in time. Year in year out we’re pushing both logistical operations and IT to their limits; two elements that come together in the role of a WMS (Warehouse Management System) Consultant. it’s our job to design and build scalable solutions in the WMS to improve stability and operational efficiency.
Read moreBy Jasper van Heijst on 21-12-2018
Category: Blog, Development Tags: Java software engineering GraphQL
At bol.com we use GraphQL in our IT landscape, and we’ve found a convenient way of working with these API’s we would like to share. By generating our GraphQL queries from Java objects by using annotations, developers don’t need to worry about the query, and don’t need to maintain both a query and a domain object anymore.
Read moreBy Eduardo da Silva on 14-12-2018
Category: Architecture, Culture, Development, Events Tags: Architecture Development Culture Design
TL;DR: this article discusses in detail my presentation at Spaces Summit 2018. I talked about the need to stop smashing our keyboards and “blindly” focus on “high-speed”, and start thinking about what we are doing, why and how we are doing it.
Read moreBy ir. drs. Niels Basjes on 10-12-2018
Category: Data Science & AI, Development Tags: Java Software Open source DataScience Algorithms
In many systems at bol.com the response speed of our systems is very important. This blog is about the data structures and algorithms we used to make a specific analysis step a lot faster: Finding the longest matching string prefix.
Read moreBy Volkan Yazici on 3-12-2018
Category: Development Tags: Java elasticsearch search etl
The biggest e-commerce company in the Netherlands and Belgium, bol.com, set out on a 4 year journey to rethink and rebuild their entire ETL (Extract, Transform, Load) pipeline, that has been cooking up the data used by its search engine since the dawn of time.
Read moreBy Sjors van Berkel on 25-09-2018
Category: Blog, Culture, Development Tags: Java Kotlin conference Organizing JVM
Last June, Spaces Summit was organized by and for bol.com employees. At Techlab, we want to celebrate this event by highlighting two presentations every month. This month, let’s get meta, and talk about organizing a conference. After that, we’ll go full geek again and look at Kotlin, to cure the Java headache you probably didn’t realize you were having in the first place.
Read moreBy Laura and Paul on 11-09-2018
Category: Blog, Culture, Development Tags: Development internship IT automated testing Axon Spaces Summit
At bol.com, we deal with a lot of complex, technical challenges. Luckily, we also attract a lot of people who like a good challenge. This blog features two of our valuable interns, who chose to do a project with bol.com to benefit both us, and their studies. Read about their experiences, and the fun they had while doing their awesome work.
Read moreBy Sjors van Berkel on 15-08-2018
Category: Blog, Development Tags: Testing Spock Karate Cucumber API
Last June, Spaces Summit was organized by and for bol.com employees. At Techlab, we want to celebrate this event by highlighting two presentations every month. This month, we will look at two exciting presentations about aptly-named testing frameworks: Spock, and Karate.
Read moreBy Gabor Hermann on 30-07-2018
Category: Development Tags: Java Scalability BigData Open source distributed
Last year the Measuring 2.0 team at bol.com has started measuring user behavior on the bol.com website. Of course, we wanted to make the data widely accessible within the whole organization.
Read moreBy Pim Rebholz on 10-07-2018
Category: Development, Testing Tags: Testing Cypress JavaScript Test automation
Early October 2017 saw the release of a new tool for test automation, Cypress 1.0. It’s not just another tool, it’s a tool with specific goals in mind.
Read moreBy Sjors van Berkel on 8-07-2018
Category: Blog, Architecture, Culture, Cloud, Development Tags: Event cloud
Last June, Spaces Summit was organized by and for bol.com employees. At Techlab, we want to celebrate this event by highlighting two presentations every month. This month, we will look at the challenges of moving our server infrastructure to the cloud, and, also important, how to use the cloud for pouring cold beer. Talk #1: Going to the cloud: Forget EVERYTHING you know! Speaker: Maarten Dirkse Genre: Way of working Slides Abstract: bol.com is moving to the cloud. When you’re doing so, what should you care about? Can you handle the…
Read moreBy Elinor Bakker on 19-06-2018
Category: Architecture, UX, Development Tags: Architecture Microservices Scalability UX Partners bol.com devops YBIYRIYLI
Web applications usually start small and loveable, but gradually become larger and larger as more people work on them and front-end technologies move on. If you’re not careful they can potentially end up as the one thing no-one wants to touch anymore and cause a lot of frustrations for agile teams and business innovators alike.
Read moreBy AKrichevskiy on 14-06-2018
Category: Blog, Culture, Events Tags: Development conference Summit IT
Yes, we made it again! Spaces summit 2018 – the bol.com IT conference by engineers, for engineers – happened again last 7th of June, on the hot summer day in our home town Utrecht.
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By Ajeesh on 25-05-2018
Category: Blog, Development, Testing Tags: Testing Agile devops Docker
Testing has been in an accelerated evolution over the last decade. Due to the fact that different practices — like Continuous Integration and Delivery, DevOps, and Agile — have shifted and refined at a rapid pace.
Read moreBy AKrichevskiy on 8-05-2018
Category: Blog, Culture, Development Tags: skills coding assignment test
At bol.com, IT grows together with the rest of the organization. We are constantly searching for brilliant new colleagues. We believe that we are as good as our next hire, and our next hire depends on our interview process.
Read moreBy Frederieke Ubels on 8-05-2018
Category: Blog, Culture, Development, Events Tags: Young Professional Event Community conference Engineering Culture
Well, pretty cool, I’d say. And even cooler if you are a young professional, fresh out of university and just started in your first job. But our pay-off is “Je kan het met bol.com” and that’s exactly how it is!
Read moreBy Frederieke Ubels on 18-04-2018
Category: Blog, Development Tags: Resilience Agile devops YBIYRIYLI Autonomy Quality
In the heart of the Agile method are autonomous teams that take responsibility and make their own decisions. Transitioning to self-organizing teams may seem like a risk, a move intuitively perilous to quality. But Rini van Solingen explains how bol.com and ANWB used autonomous teams to greatly improve the quality of their systems.
Read moreBy Boyd Hogerheijde on 5-04-2018
Category: Blog, Culture, Development Tags: Young Professional software engineering internship
Boyd was an intern at bol.com from September 2017 until January 2018. This blog is a conversation between him and his intern mentor, Maurice Zeijen (Software Architect @ bol.com), about his experiences as an intern.
Read moreBy Daniël Heres on 7-03-2018
Category: Blog, Data Science & AI Tags: Machine Learning Natural language processing Chatbots Deep Learning Artificial Intelligence
In this post, I will explain how bol.com is going to interpret what the user says using Machine Learning and Natural Language Processing.
Read moreBy Denise Visser on 5-03-2018
Category: Blog, Architecture Tags: Payment optimization process
According to figures from Ingenico, around 15% of site visitors in the Netherlands that begin the payment process do not complete their transaction. This can have many causes which will be examined later in this article.
Read moreBy Ernst Kuiper on 20-02-2018
Category: Blog, Data Science & AI Tags: BigData DataScience Machine Learning
Data Science and Machine Learning are becoming more integrated into current businesses. Especially in e-commerce there is huge potential for predictive modeling. It is therefore no surprise that bol.com has given extra focus on significantly expanding its Data Science efforts the coming year. That’s not to say that there aren’t already some interesting Data Science projects running. In this blog post we will take a look at one of the projects I am currently working on with fellow data scientist Joep Janssen: the chunk project.
Read moreBy Menno Vis on 16-01-2018
Category: Blog, Culture, Development Tags: teams continuous improvement idea
One of the things that keeps us busy at bol.com is the continuous quest to figure out what else we could do to make our teams better. Even better I should write, since the vast majority of our teams are doing great already and I am very proud at them!
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By Menno Vis on 16-12-2017
Category: Culture, Development Tags: Agile Scrum Culture Autonomy Video
Over 1200 people work at bol.com and our IT department consists of more than 350 engineers, clustered into 60 cross-functional teams. These teams are all grouped in fleets and spaces. Staying organized at this scale is definitely a challenge. To make this happen, we optimize for autonomy, mastery, purpose and ownership
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By Mattijs Meiboom on 15-12-2017
Category: Blog, Architecture, Culture, Development Tags: Testing Architecture Microservices Concepts Change Risks
“My past year as a software engineer at bol.com has mostly been dedicated to breaking down one of the big monoliths within our software landscape into smaller services. To be more specific: I’ve been working in a team to extract the processes related to customer returns into a separate microservice.”
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By Patrick van Dissel on 1-12-2017
Category: Blog, Culture, Infrastructure, Development, Testing Tags: Testing Development Continuous Integration Continuous Delivery continuous improvement Jenkins Gitlab Spinnaker Build Automation
Bol.com has a build automation tools team since 2012, going from installation manuals, to hundreds of manually maintained Jenkins jobs, to 5000+ generated Jenkins jobs, to fully autonomous teams. What did we do, what are we doing, where are we going, and how are we getting there.
In this demo rich talk, We’ll show you the ins- and outs, our challenges, and our approaches to keeping our growing development community happy and productive.
Read moreBy William Leese on 23-11-2017
Category: Blog, Infrastructure, Development, Events Tags: data production monitoring
Creating great software just doesn’t cut it anymore. Nowadays you as the developer are also responsible for running it.When things go wrong, you’re the one pouring through all the data to find out what happened.
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By Menno Vis on 16-11-2017
Category: Blog, Development, Testing Tags: Testing
This year at the EuroSTAR Conference Joost and Ivo were invited to give their tutorial ‘Docker for Testers’. Docker has been instrumental in speeding up the development process at bol.com. We use it to create isolated test environments, to speed up feedback cycles and to allow teams to work more autonomously.
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By Frederieke Ubels on 9-11-2017
Category: Blog, Culture, Infrastructure, Development Tags: devops Development release
Due to the influence of agile working and the increasing dynamics of the market, releasing is becoming a bottleneck. The question is: how can we fundamentally accelerate the release process? Rini van solingen explains which measures work in practice and illustrates this based on interviews at bol.com.
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By Ivan Budincevic on 6-11-2017
Category: Blog, Infrastructure, Development Tags: Infrastructure Web Analytics Apache Flink Kafka Avro Parguet
At the Berlin Buzzwords 2017 conference I had the chance to talk about our new measuring infrastructure at bol.com.
Read moreBy Menno Vis on 1-11-2017
Category: Blog, Culture, Development Tags: Agile Scrum devops Culture leadership
This is the fifth and last post about our growth story. You’ve read about the history of bol.com and the process they made to reach their goal: landing on the moon. Now we’ve come to the final chapter.
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By Jim van der Waal on 18-10-2017
Category: Blog, Culture, Development Tags: Security user stories requirements happy flows hacker analysis
Thinking of requirements that limit your cool idea doesn’t sound like a lot of fun right? But actually it is.
Read moreBy Maarten Dirkse on 18-10-2017
Category: Blog, Diversity, Culture, Development, Events Tags: hackathon Development software engineering frontend kubernetes selenium
The 9th edition of the bol.com internal hackathon was held on Friday, October 6th, and participants were able to present their projects to the colleagues last Thursday.
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By Mary Gouseti on 12-10-2017
Category: Development, Events Tags: Software Agile Scrum Development University Amsterdam
For the last 4 years, Menno represents bol.com as a guest lecturer in one of the courses of the Software Engineering Master’s program at University of Amsterdam, this year it’s about Requirements engineering.
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By ahuguetvives on 28-09-2017
Category: Blog, Development Tags: Software Development database Front-End
A couple of months ago we organized our first internal tech conference, Spaces Summit. In the upcoming months we will post some of the talks including the video of the talk.
Read moreBy Patrick van Dissel on 26-09-2017
Category: Security, Events Tags: Meetup Event Software Security Hackers
On Thursday the 12th of October, the meetup of Software Engineering about security will be hosted by bol.com together with Zerocopter and Flock.
Read moreBy Maarten Dirkse on 13-09-2017
Category: Architecture, Culture, Cloud, Development Tags: Event Architecture Software Cloudbusting cloud
IT infrastructure transitions can be hard. Obviously there are technical challenges to overcome. But what do you do when internal disagreement about the way forward leads to a halt in innovation?
Read moreBy Ajeesh on 5-09-2017
Category: Development, Testing Tags: Testing Feature Toggle Continuous Integration Continuous Delivery
Back in the day, my team couldn’t deploy a new software version to production immediately. We had to wait because testing hadn’t finished. Or because a big feature wasn’t production-ready. Or because our acceptance tester didn’t have time to check the new version.
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By Maarten Dirkse on 5-09-2017
Category: Culture, Events Tags: Event circus Cloudbusting
The conference with a kick is back! And they have been busy.. This time Software Circus will come back as a true FestiCon. Here they will challenge the status quo and bust this cloud open to really see what is in, out and around. And bol.com will be a part of this FestiCon Circus.
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By Maurice Zeijen on 1-09-2017
Category: Blog, Architecture, Development Tags: Event Microservices Hystrix Video
During the GoTo Amsterdam conference this year, I did a talk on “Resilience Engineering in a Microservice Landscape”.
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By Menno Vis on 23-08-2017
Category: Blog, Culture, Development Tags: Agile Scrum devops leadership
This is the fourth post about our growth story. In the previous blog post we explained how bol.com realized an organizational change with YBIYRIYLI (You build it, you run it, you love it). Now it’s time to take a closer look at the more personal part. How can a company make sure employees stay happy and motivated? What does it take to be a leader in a company with autonomous teams? And how did bol.com take on this challenge?
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By Willem Veelenturf on 11-08-2017
Category: Development, Events Tags: Meetup Event Microservices
On Thursday the 7th of September Meetup of Software Engineering will be hosted by bol.com together with Flock.
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By Lucas Verberne on 24-07-2017
Category: Testing Tags: Testing Community Culture
After the success of Software Testing World Cup last year, the winning team thought a Dutch version would also be interesting. Co-organized and hosted by Dutch Software Testing Association TestNet, the championship took place on May 1st.
Read moreBy Frederieke Ubels on 20-07-2017
Category: Development Tags: Architecture Microservices Scalability devops Autonomy
What started out as a means of technical scalability turned out to be the most important driver of team autonomy – and vice versa. This is our story of Backspin, Rabbits and the Man on the Moon.
Read moreBy Roy Jacobs on 23-06-2017
Category: Culture, Development, Events Tags: Conferences Engineering Fun Culture
bol.com has two speeds of operation: “very fast” and “extremely fast”. In this whirlwind it can sometimes be difficult for teams to share knowledge or just talk about things they find interesting. A handful of colleagues decided something needed to be done about this. What better way, they thought, than to just organize an entire conference by themselves?
Read moreBy PeterPaulvandeBeek on 21-06-2017
Category: Blog, Architecture, Development Tags: CQRS Web scale Architecture patterns scale
In this posts, we’ll show you how we use the CQRS “web scale” pattern to achieve scalability and flexibility in our back office software. This is needed as we rely heavily on our back office to offer our customers the best available service.
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By ntinnemeier on 12-06-2017
Category: Blog, Culture, Development Tags: Architecture Microservices database Grafana
How do you get the IT management board to serve you coffee on a golden platter? You have to do something good of course, exceptional in fact. In order to tell you how we became top performer instead of database killer by creative use of a cache, we will have to take you back to December 2015, when it all started.
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By Maurice Zeijen on 11-06-2017
Category: Development, Events Tags: Meetup Event devops
Join us on the 22nd of June at the DevOps Utrecht Meetup! For this meetup we have a talk from Maurice Zeijen about Resilience engineering in a microservice landscape. Brian Engel will close this evening by taking us into the world of the Dutch Police and how they’ve adopted DevOps.
Read moreBy Menno Vis on 26-05-2017
Category: Blog, Culture, Events Tags: Event Agile Conferences Development
Are you going to Agile Amsterdam? Be sure to check out bol.com on the 21st of September! Menno Vis (IT Director) and Mary Gouseti (Software Engineer) will be presenting a hands-on case from 12:00 PM to 12:30 PM (track 1).
Read moreBy Rogier Lommers on 17-05-2017
Category: Blog, Architecture, Development Tags: Golang hackathon crazy client-server gamification distributed go
How can you make sure images don’t slow down your page load performance? All it took us was some unconventional thinking: seti@bol.com.
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By Joost van Wollingen on 16-05-2017
Category: Testing, Events Tags: Testing Meetup tooling
New testing tools are introduced every week it seems, but how new and useful are they really? The search for the ultimate tool seems to be a never ending quest.
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By Menno Vis on 15-05-2017
Category: Blog, Culture, Development Tags: Agile Scrum devops YBIYRIYLI
This is the third post about our growth story. In the last blog post we elaborated on some necessary steps to take in an organizational change. We have explained that the steps bol.com has taken are very much in line with John Kotter’s steps. In this post we will have a closer look at the process in the spaces.
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By Joost van Wollingen on 19-04-2017
Category: Testing, Events Tags: Testing michael bolton skills
What is testing? What is the testing role? Is testing a demonstration that a product fulfills its declared functional requirements? If machinery can be programmed to check hundreds and thousands of functions in a second, do we need testers any more? Michael Bolton – The balance between social & technical skills Michael Bolton says we do, but not so much to check for functional correctness—which arguably should never have been a central part of the tester’s job in the first place. We need people in a testing role to do…
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By Tuan L.D. on 4-04-2017
Category: Blog, Development Tags: Machine Learning Image Recognition
It is not easy, but not unachievable. A post on playing around with image recognition, for seeing the possibilities we can do with it. Technical details are kept as low as possible.
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By Paul Lai on 3-04-2017
Category: Development, Testing Tags: Testing James Bach
James Bach recently ran a Rapid Software Testing (RST) workshop at bol.com and I was fortunate enough to participate in this engaging and informative three-day event. Bach is regarded by many as one of the thought leaders who reshaped the testing industry within the modern software development landscape (alongside Michael Bolton).
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By ir. drs. Niels Basjes on 30-03-2017
Category: Development Tags: Java Open source UX DataScience
Ever since I’ve started working for a WebAnalytics company in 2005 I’ve been working on problems related to making sense of web data. One of the most difficult elements in this type of analysis is making sense of the user agent.
Very often the raw web data I work with is stored in Apache HTTPD access log files that have been compressed using gzip.
By Thatiana Mendes on 29-03-2017
Category: UX, Development Tags: Event UX
Last Wednesday we had an inspiring evening at bol.com. We held Ladies that UX Utrecht meetup as part of our bol.com campaign Women in Tech*. Ladies that UX Utrecht is an existing group that brings together women that have passion for User Experience Design, tech and digital, positively promoting and teaching each other. They gladly brought two uplifting presentations to the 45 people in the audience. Before it everybody enjoyed a nice dinner and got prepared for what was coming after.
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By Menno Vis on 27-03-2017
Category: Culture, Development Tags: Agile Scrum
This is the second post about our growth story. In the first blog post we introduced our Man on the Moon program; how we plan to manage a fast growing company like ours. In this second part we’ll explain how we have involved all stakeholders and participants in our journey to the moon. Also, we’ll share what has inspired us and how this has helped us to set our own direction.
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By ir. drs. Niels Basjes on 22-03-2017
Category: Architecture, Development Tags: Scalability BigData
At bol.com we service millions of products to millions of customers, resulting in billions of pages each year. We want to create the most effective service to our visitors we possibly can. So we spent a lot of time preparing the content, monitoring the systems and analyzing how we can support our customers better in finding what they really want.
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By Joost van Wollingen on 21-03-2017
Category: Development, Testing Tags: Testing Meetup James Bach
We hosted the Techlab meetup on the 15th of March, which was a very well visited evening. James kicked off the night in style by speaking about the future of the testing role. He also went into detail on what skills make testers unique and that readiness to pick up tasks is crucial to be able to do a task well. Click read more to see the video!
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By Thatiana Mendes on 20-03-2017
Category: Culture, Development Tags: Event Partners bol.com hackathon game
Today we had our third edition of Let partners shine. Around 50 bol.comer’s – among them software engineers, test engineers, information analysts, UX designers and business analysts – got together for the whole day to participate in this competition. The idea was to fix and improve little interactions that cause frustration for the users in the partner platform.
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By Dgiesen on 16-03-2017
Category: Blog, UX, Development Tags: UX Beta Innovation
Bol.com starts an online test environment called beta.bol.com. It is a way to test and experiment quickly with new (technical) ideas and concepts in order to improve the shopping experience of the customer. This new environment is opened in order to speed up the innovation process from idea to realization, and fills up the gap between user research (N = 1) and A/B testing (N = >100k).
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By Joost van Wollingen on 14-03-2017
Category: Testing Tags: Testing Community Tribes Guild Goals
Everybody wants to stay ahead of the game. It is no different for the bol.com testing community. Ever wondered how we manage to do that? In this post I gladly share how bol.com test engineers keep challenging and inspiring each other.
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By Hans van Buuren on 6-03-2017
Category: Development Tags: Responsiveness
Bol.com features a fully responsive online store that adjusts its look and feel to the type and capabilities of the device and browser you’re using. This enhances usability, speed and conversion.
Read moreBy Menno Vis on 1-03-2017
Category: Culture Tags: Agile Scrum
From a small online book store to an e-commerce platform with 7 million customers. That’s the short version of the bol.com story so far. This is the first post from a series through which we would like to share our growth story. These posts are written by Roy Gielen, an agile enabler who interviewed several persons at bol.com on this topic.
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By Oscar Westra van Holthe - Kind on 7-02-2017
Category: Development Tags: Architecture Software Maintenance
Software maintenance can be hell. I’m sure that many developers have opened up an existing codebase, only to be greeted with a plethora of packages. You can usually see in excruciating detail the kinds of classes the software has. Any features implemented by the software are obfuscated. And once you slowly, ever so slowly, get to know the software, it gets worse: all those packages have a more or less good reason to exist. This means refactoring bit by bit (the boy scout rule) only makes the situation worse, and…
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By Roy Jacobs on 7-02-2017
Category: Development Tags: Hazelcast Java
When you build a service at bol.com your responsibility doesn’t end once the build is green. You’re actually supposed to run it (and keep it running) in production, too. Luckily, our team doesn’t have to do this all by ourselves: there are platform and infrastructure teams to turn to and other development teams to harass over coffee. It’s a bit like caring for a newborn baby I suppose: you try to do a lot yourself but when the baby starts crying for the first time you’ll need all the help…
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By Volkan Yazici on 7-02-2017
Category: Diversity Tags: Expat International
While working abroad as an expat might sound like an exciting opportunity with noteworthy advantages, “adaptation” constitutes the dominant factor of the entire challenge. Which language will you use for communication? What about cultural differences? To what extent will you socially get accepted by the community? And what will you be leaving behind by accepting the offer? And don’t forget the other side of the coin: almost all of these questions can be applicable to the native (Dutch) employees currently employed. I have been working at bol.com as a software…
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