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Full Stack Developer

https://www.circlek.com Logo

Circle K

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Location:
Poland , Warszawa

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Category:
IT - Software Development

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Contract Type:
Employment contract

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Salary:

Not provided
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Job Description:

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 software point-of-sale platform (POS System) deployed across Circle K's European store network.

Job Responsibility:

  • Design and implement POS functionality using proprietary development stack (Spring-based backend, selected JavaScript framework frontend and custom DSL)
  • Build and maintain custom extensions, integrations, and configurations within the retail platform without modifying the core POS where possible
  • Develop custom frontend applications integrated into POS via the App Enablement Framework (JxBrowser/Chromium)
  • Implement and configure business processes: checkout flows, payment handling, barcode processing rules, and loyalty engine integrations
  • Work with Data Containers, Master Data distribution, and Service API layer for POS integrations
  • Contribute to localization and fiscalisation of POS solutions for different European markets
  • Collaborate with Technical Product Owner, Solution Architects, QA Engineers and DevOps in an agile, multinational environment
  • Ensure configuration changes follow proper lifecycle management: versioning, environment promotion (DEV → TEST → PROD)

Requirements:

  • 3+ years' experience in Java development (Java 11+), including Spring Framework (XML/Java config, annotations, custom extensions)
  • Hands-on experience with enterprise frontend frameworks
  • Solid understanding of POS systems, retail checkout flows, and payment processing concepts
  • Experience with REST API integration and microservice communication patterns
  • Proficiency with Eclipse IDE (2020 or compatible) — required by the POS development toolchain
  • Ability to read, maintain, and extend code generated by proprietary DSLs
  • Strong configuration management skills: XML-based Spring config, property files, and environment-specific deployments
  • Experience working with relational databases (SQL, data modelling)
  • Practical knowledge of Git, CI/CD basics and version control workflows
  • Fluent English and Polish — level B2/C1 minimum

Nice to have:

  • Prior experience with POS software OmniPOS / CLOUD4RETAIL platform
  • Knowledge of fiscalisation requirements in European markets (Poland, Baltic states, Nordics)
  • Experience with JxBrowser / Chromium-based embedded browser engines
  • Frontend development skills: React, Angular, Vue.js, SAP UI5 or any modern JavaScript framework (for Custom App development via App Enablement Framework)
  • Familiarity with SAP Storemanager, POS systems, or similar retail configuration tooling
  • Experience in loyalty systems integration, mobile payment flows, or self-checkout solutions
  • Knowledge of TDD / BDD approaches (JUnit, Mockito, Cucumber)
  • Understanding of edge computing architectures (central ↔ edge ↔ checkout)
What we offer:
  • Annual bonus
  • Private medical care
  • Multisport
  • Possibility for author's tax deduction
  • English lessons subsidized by the company
  • Group insurance
  • Attractive discounts for products and services at our stations
  • Employee stock purchase plan
  • ICAS
  • 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

Additional Information:

Job Posted:
May 04, 2026

Employment Type:
Fulltime
Work Type:
On-site work
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