Full Stack Developer

Alimentation Couche-Tard inc.; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Annual bonus

Private medical care

Cafeteria Platform/Multisport

English lessons

Stock purchase plan

Lyra EAP

Two additional days off

Referral Bonus

Modern office in Warsaw

Training & skill development

Job summary

Circle K Global Development is seeking a Full Stack Developer to join the Retail and Digital Channels Development Section. The role spans backend services for a global retail platform and frontend web apps run inside embedded browser contexts, collaborating with agile teams across Europe.

You will design REST/SOAP interfaces, work with POS integrations, and contribute to localization and fiscalisation across European markets. English and Polish fluency required.

Qualifications

• 4+ years' Java development experience (Java 8+, ideally Java 11+), including JUnit, JPA/Hibernate, JAX-RS/JAX-WS
• Solid Spring Framework experience across modern Spring (Boot, Data, Cloud) and legacy Spring with XML/Java-based config
• Experience with REST and SOAP interfaces, API docs (Swagger/OpenAPI) and microservice communication patterns
• Experience with relational databases (PostgreSQL, SQL, data modelling)
• Working knowledge of at least one modern JavaScript framework (React, Angular, Vue.js, SAP UI5) and TypeScript
• Hands-on experience with Git, CI/CD and version control workflows (Jenkins, Sonar, Gradle)
• Understanding of POS systems, retail checkout flows and payment processing concepts
• Knowledge of design patterns and Domain Driven Design basics
• Experience with Agile software development methodologies (SCRUM)
• Fluent English and Polish — B2/C1 minimum

Responsibilities

• Design and implement backend services for the global retail sales platform—domain services, REST/SOAP interfaces, data access layers
• Design and implement POS functionality using Spring-based backend and custom DSL
• Build and maintain extensions and integrations within the retail platform, avoiding POS core changes
• Work with Data Containers, Master Data distribution and Service API layer for POS integrations
• Implement and configure business processes: checkout flows, payment handling, barcode rules, loyalty integrations
• Contribute to localization and fiscalisation of POS solutions for different European markets
• Ensure lifecycle management: versioning and environment promotion DEV-TEST-PROD
• Develop web applications on embedded browser (JxBrowser) and backend endpoints for end-to-end delivery
• Extend and maintain enterprise frontend apps (Employee Hub, Launchpad)
• Collaborate in an agile multinational environment

Skills

Java development

Spring Framework

REST/SOAP

PostgreSQL

JavaScript framework

Git CI/CD

POS systems knowledge

Agile SCRUM

English & Polish

Domain Driven Design

Education

Degree in Computer Science or Engineering

Tools

JxBrowser/Chromium

Docker

Kubernetes

Eclipse 2020

Swagger/OpenAPI

Azure cloud services

Gradle

Jenkins

Cosmos DB

Job description

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 the Retail and Digital Channels Development Section at Circle K Global Development. The role sits on the boundary between our cloud-based integration platform and the POS System running in our stores, and covers both sides of that boundary.

On the platform and backend side you will:

• Design and implement backend services for the global retail sales platform — domain services, REST/SOAP interfaces, message-driven integrations and data access layers
• Design and implement POS functionality using our proprietary development stack (Spring-based backend, custom DSL)
• Build and maintain custom extensions, integrations and configurations within the retail platform, avoiding changes to the POS core wherever possible
• Work with Data Containers, Master Data distribution and the Service API layer for POS integrations
• Implement and configure business processes: checkout flows, payment handling, barcode processing rules and loyalty engine integrations
• Contribute to localization and fiscalisation of POS solutions for different European markets
• Ensure changes follow proper lifecycle management: versioning, environment promotion (DEV - TEST - PROD)

On the App Enablement side you will:

• Develop custom web applications that are launched on the POS and run inside its dedicated embedded browser (JxBrowser/Chromium), integrated through the App Enablement Framework and its JavaScript API bridge
• Build the backend endpoints and integration flows those applications depend on, so that a feature is delivered end to end by one team
• Extend and maintain our enterprise frontend applications (Employee Hub, Launchpad)
• Work within the constraints of in-store hardware and checkout ergonomics — touch input, limited screen real estate, operator speed

You will collaborate with a Technical Product Owner, Solution Architects, QA Engineers, DevOps and numerous skilled developers in an agile, multinational environment.

Requirements

Must have:

• 4+ years' Java development experience (Java 8+, ideally Java 11+), including JUnit, JPA/Hibernate, JAX-RS/JAX-WS
• Solid Spring Framework experience across both worlds: modern Spring (Boot, Data, Cloud) and legacy Spring with XML/Java-based configuration, annotations and custom extensions
• Experience with REST and SOAP interfaces, API documentation (Swagger/OpenAPI) and microservice communication patterns
• Experience with relational databases (PostgreSQL, SQL, data modelling)
• Working knowledge of at least one modern JavaScript framework (React, Angular, Vue.js, SAP UI5 or similar) and TypeScript — enough to build and maintain production frontend applications
• Practical knowledge of Git, CI/CD and version control workflows (Jenkins, Sonar, Gradle)
• Understanding of POS systems, retail checkout flows and payment processing concepts
• Knowledge and practice in applying design patterns and principles; basics of Domain Driven Design
• Experience with agile software development methodologies (SCRUM)
• Fluent English and Polish — B2/C1 minimum

Nice to have:

• Prior experience with OmniPOS / CLOUD4RETAIL platform
• Knowledge of fiscalisation requirements in European markets (Poland, Baltic states, Nordics)
• Experience with JxBrowser or other Chromium-based embedded browser engines
• Familiarity with Storemanager or similar retail configuration tooling
• Experience in loyalty systems integration, mobile payment flows or self-checkout solutions
• Experience with NoSQL (MongoDB, Cosmos DB) and Redis
• Experience with containerisation and orchestration (Docker, Kubernetes)
• Experience with cloud environments, Azure preferred
• Knowledge of TDD/BDD approaches (Spock, Mockito, Cucumber)
• Understanding of edge computing architectures (central edge checkout)
• Degree in Computer Science or Engineering

Technology Stack

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

• Backend (platform): Spring Boot, Spring Data, Spring Cloud, JPA/Hibernate, PostgreSQL, NoSQL (MongoDB, Cosmos DB), Redis, Azure cloud services
• Backend (POS): Spring Framework (legacy version with custom extensions, XML/Java-based configuration, no Spring Boot auto-configuration)
• Frontend: enterprise JavaScript framework applications (Employee Hub, Launchpad); React/Angular/Vue.js for custom POS apps
• Custom app integration: JxBrowser engine (Chromium 139.x) with JavaScript API bridge
• POS configuration: Storemanager, Menu Editor, Data Containers, Barcode Processor rules
• Integration: Service API, REST and SOAP interfaces, external loyalty and payment system connectors
• Tooling: Git, Gradle, Jenkins, Sonar, Docker, Kubernetes; Eclipse 2020 (required for the POS toolchain)

What do we offer?

• Contract of employment
• Annual bonus
• Private medical care
• Cafeteria Platform/Multisport
• English lessons subsidized by the company
• Group insurance
• Attractive discounts for products and services at our stations
• Employee stock purchase plan
• Employee Assistance Program (Lyra)
• Two additional days off (Good Friday, Friday after Corpus Christi) - with the possibility of exchanging for other holidays
• Employee Referral Bonus Program
• Modern and convenient office that you can virtually visit here - https://goo.gl/maps/CLteHfYcdYMbdESq6
• 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