Software Tester met stage contract vacatures

Internship Model-Checking Online Payment Services

Enschede

Internship Model-Checking Online Payment Services (Period Continuous) - WO / University

About the assignment

In recent years, DISH's ecosystem has shifted from a traditional POS solution to a modern omnichannel-based solution. With respect to payments, the traditional approach was quite straightforward. For instance, one would order a drink and then pay the amount required for that order, either by card or cash. This linear sequence of events is quite easy to oversee. Hence, verifying the correctness of these events has also not been a serious concern. In our modern approach multiple cloud-based systems play a role, in order to establish a successful iDEAL or PayPal payment for instance. Among these systems we have back-ends that determine the amount to be paid, services that initiate the payment, services that complete the payment and your mobile device that acts as a front-end. Verifying the correctness of these interacting systems is a serious challenge. The fact that communication between these systems mostly happens asynchronously, and across multiple vendors, makes verification even harder.

We would like to see a model-checking based solution that verifies the correctness of these interacting systems. Based on some formalized requirements, one can design and refine formal models of these systems. Designing these models can be done using some formal modelling language. Refining is done through traces extracted from these models by a model checker that also considers the requirements. These traces can be made executable and be run against booq's online payment services through REST APIs. Depending on the output of the running system one can improve the formalization, or show that the implementation needs improvement. This technique is also known as Counter Example Guided Abstraction Refinement (CEGAR). As the behavior of the individual systems is typically well understood; their complex interactions usually to a lesser degree, leading to unforeseen corner cases. These corner cases may for instance present themselves in practise as users not being able to complete a payment successfully. By applying the CEGAR-based solution we hope to catch these corner cases early and thus improve the correctness of the DISH platform in general.

What do we offer?

• Daily nutritious lunches, on us

We believe that having lunch together is important. Bread, saltines, fruit, juice… It's ready for you to enjoy, and it's complementary. Have a fun chat with your colleagues or enjoy a game of table football. A real luxury that you don't have to prepare your lunch every morning.

• Friday afternoon; drinks and snacks

At Eijsink, no Friday afternoon passes over without a drink. Regardless of if you're located in Oosterwolde or Wateringen. With a soda, beer or wine we toast to the weekend. And let's not forget the snacks! If you don't feel like having a drink, no problem, it's not obligatory.

• Learning & development; a place for you to grow

A challenge and a varied job within a modern organization? Then we are a match! Apart from outstanding primary and secondary employment conditions we offer the opportunity for you to follow intern trainings and to grow into a new role. This way you can develop, and we grow alongside with you.

We are Eijsink

The cash register supplier? A nickname that we carry with pride! Currently we have grown into a full-fledged software company in the Dutch hospitality industry! For over four decades we help hospitality entrepreneurs to work smarter with ironclad solutions. With more than 200 colleagues who proudly represent Eijsink day-in and day-out. With our in-house developed DISH-software, we offer a unique total platform.

Within 40 years Eijsink has grown to be a software company with knowledge of people. With colleagues located at our head office in Hengelo, IT-colleagues in Enschede and Oosterwolde, or at our locations in Breda, Den Haag en Amsterdam. Experience our expertise and tools at our leading clients such as De Efteling, Ahoy Rotterdam or De Beren.

We would like to meet you

If you are a student WO Computer Science and you are interested in this assignment, you can apply directly! Let's drink a coffee and talk about the possibilities. We hope to see you soon!

Bel of mail onze Recruitment Marketeer: Marije helpt je graag verder.

Bel via [email protected]

Wij combineren sterke arbeidsvoorwaarden met leuke voordelen: 27 vrije dagen, gratis lunch, lease-a-bike, een actieve PV en natuurlijk de vrijdagmiddagborrel. Meer weten? Vertellen we je graag persoonlijk.

Lunchen zoals het hoort

Iedere dag staat er een verse lunch voor je klaar. Je schuift aan bij collega's, zonder gedoe of voorbereiding. Gewoon even écht pauze.

Blijven leren

Of je nu bij wilt scholen, een nieuwe richting op wilt of simpelweg wilt groeien in je rol: wij geven je de ruimte met interne trainingen en volop doorgroeikansen.

• Je bent door!
• Face-to-face
• Part two
• Wij ook van jou

Twee gesprekken zijn vaak genoeg om een goed beeld te krijgen. Is het enthousiasme wederzijds? Dan doen we je graag een aanbod en begint jouw carrière bij Eijsink. Welkom!

Wij zijn Eijsink

De kassaleverancier? Een geuzennaam waar we trots op zijn! Inmiddels zijn wij naast erkend partner een volwaardig software bedrijf in de Nederlandse hospitality sector! Al vier decennia helpen we horecaondernemers slimmer te werken met ijzersterke oplossingen. Met meer dan 200 collega's die dag in, dag uit de trots voor Eijsink uitdragen. Met onze in-house ontwikkelde DISH-software waarmee we een uniek totaalplatform bieden.

Eijsink is in 40 jaar uitgegroeid tot een ambitieus softwarebedrijf mét mensenkennis. Met collega's op het hoofdkantoor in Hengelo, IT-collega's op onze software locatie in Enschede en Oosterwolde, daarnaast nog vestigingen in Breda, Den Haag en Amsterdam. Beleef de meerwaarde van onze tools bij toonaangevende klanten als De Efteling, Ahoy Rotterdam en De Beren.

Wij dagen je uit om samen met ons en onze toffe klanten aan de toekomst van hospitality te bouwen!

Klaar om samen nóg meer impact te maken? Stuur je CV en motivatie naar via [email protected] . Je kunt natuurlijk ook eerst bellen met Rubel Bilgic , jouw toekomstige manager, voor het antwoord op je prangende vragen: .