Full Stack Developer

Job Description

Circle K Business Centre is a shared service center which supports Circle K Europe operations through a wide range of services within Finance & Control, Information Technologies, Human Resources, Transport Fuel and Customer Service.

Circle K is part of the Canadian company Alimentation Couche Tard Inc. (Couche-Tard), one of the world's largest joint-stock convenience retail companies, listed on the Toronto Stock Exchange (TSE). It has operations in North America, Europe, Asia and the Middle East. It has approximately 12,300 sites across its network in North America (U.S. and Canada), Europe (Norway, Sweden, Denmark, Ireland, Poland, the Baltics), Asia and the Middle East. We are a family of more than 100,000 merchants making it easy for our customers around the world.

In the last few years, our continuously growing development teams (currently over 200 skilled IT professionals) have successfully implemented and deployed various software solutions to Circle K customers across Europe and North America. Among the solutions you will find web applications, native mobile applications and technical components.

What you will be working on

We are looking for a Full Stack Developer to join Retail and Digital Channels Development Section at Circle K Global Development , responsible for developing, extending, and maintaining the s oftware point-of- sale platform (POS System) deployed across Circle K's European store network.

As a Full Stack Developer, you will work within the POS Core team to :

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Design and implement POS functionality using proprietary development stack (Spring-based backend, selected JavaScript framework frontend and custom DSL)

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Build and maintain custom extensions, integrations, and configurations within the retail platform without modifying the core POS where possible

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Develop custom frontend applications integrated into POS via the App Enablement Framework ( JxBrowser /Chromium)

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Implement and configure business processes: checkout flows, payment handling, barcode processing rules, and loyalty engine integrations

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Work with Data Containers, Master Data distribution, and Service API layer for POS integrations

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Contribute to localization and fiscalisation of POS solutions for different European markets

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Collaborate with Technical Product Owner, Solution Architects, QA Engineers and DevOps in an agile, multinational environment

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Ensure configuration changes follow proper lifecycle management: versioning, environment promotion (DEV → TEST → PROD)

You will work with us using the specialized proprietary environment , collaborating with Technical Product Owner, numerous skilled Developers, Testers, DevOps and Architects as new colleagues, working in an agile, multinational environment.

Requirements

Must have

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3+ years' experience in Java development (Java 11+), including Spring Framework (XML/Java config, annotations, custom extensions)

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Hands-on experience with enterprise frontend frameworks

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Solid understanding of POS systems, retail checkout flows, and payment processing concepts

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Experience with REST API integration and microservice communication patterns

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Proficiency with Eclipse IDE (2020 or compatible) — required by the POS development toolchain

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Ability to read, maintain , and extend code generated by proprietary DSLs

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Strong configuration management skills: XML-based Spring config, property files, and environment-specific deployments

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Experience working with relational databases (SQL, data modelling)

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Practical knowledge of Git, CI/CD basics and version control workflows

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Fluent English and Polish — level B2/C1 minimum

Nice to have

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Prior experience with POS s oftware OmniPOS / CLOUD4RETAIL platform

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Knowledge of fiscalisation requirements in European markets (Poland, Baltic states, Nordics)

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Experience with JxBrowser / Chromium-based embedded browser engines

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Frontend development skills: React, Angular, Vue.js, SAP UI5 or any modern JavaScript framework (for Custom App development via App Enablement Framework)

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Familiarity with SAP Storemanager , POS systems , or similar retail configuration tooling

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Experience in loyalty systems integration, mobile payment flows, or self-checkout solutions

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Knowledge of TDD / BDD approaches (JUnit, Mockito, Cucumber)

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Understanding of edge computing architectures (central ↔ edge ↔ checkout)

Technology Stack

Working as a Developer at Circle K, you will operate within the following technology environment:

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Backend: Spring Framework (legacy version with custom extensions, XML/Java-based configuration, no Spring Boot auto-configuration)

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Code Generation: Proprietary DSL — a custom Domain-Specific Language for generating Java classes, integral to the build process

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Frontend: selected JavaScript framework (Employee Hub, Launchpad)

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Custom App Integration: JxBrowser engine (Chromium 139.x) with JavaScript API bridge for React/Angular/Vue.js custom apps

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IDE: Eclipse 2020 ( required — project-specific plugins are incompatible with newer versions)

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POS Config: Storemanager , Menu Editor, Data Containers, Barcode Processor rules

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Integration: Service API, REST interfaces, external loyalty/payment system connectors

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Version Control: Git

What do we offer?

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Annual bonus

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Private medical care

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Multisport

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Possibility for author's tax deduction

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English lessons subsidized by the company

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Group insurance

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Attractive discounts for products and services at our stations

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Employee stock purchase plan

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ICAS

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Modern and convenient office that you can virtually visit here - https://goo.gl/maps/CLteHfYcdYMbdESq6

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Trainings & possibility to develop skills in a wide international environment

When working with us you can depend upon it that you will not be judged on the grounds of race, national origin, gender, sexual orientation, disability, age, or other legally protected status. Oppositely – we believe that our diverse and inclusive culture helps us create an amazing atmosphere where everybody feels welcome.

Check who we are here: https://youtu.be/td-QGnNnvW0

Want to know even more about us? Take a look at our career page: https://workwithus.circlek.com/global/en/businesscentrewarsaw

Interested? We encourage you to apply.

We know great companies are built from within, by great people like you. Come grow with us! We´re looking forward to your application.