June 12, 2026

Full Stack Developer

Mid • Hybrid

Warsaw, Poland

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 software 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: 

 

  • 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) 

 

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: 

  • 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) 

 

 

Technology Stack 

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

 

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

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

  • Frontend: selected JavaScript framework (Employee Hub, Launchpad) 

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

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

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

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

  • Version Control: Git 

 

 

What do 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 

  • 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.

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Hybrid

Warsaw, Poland

5,500 - 6,200 USD/mo

🏢 Summary: Senior Full Stack Developer role focused on architecting and delivering high-performance web applications using React and Node.js. The position involves leading system design, building scalable front-end and back-end solutions, and overseeing cloud-based deployments and DevOps processes. The role includes technical ownership of microservices, APIs, databases, and application performance in a hybrid Warsaw-based setup. 🗂️ Requirements: 7+ years full stack development experience, 2+ years in senior or technical lead role, Expert-level React.js with Hooks and Redux, Advanced JavaScript ES6+ proficiency, Strong Node.js and Express.js experience, Experience designing REST or GraphQL APIs, Experience with OAuth, JWT, sessions, RBAC, Database design and optimization with PostgreSQL, MySQL, or MongoDB, Hands-on Docker experience, Experience with AWS, Azure, or GCP, CI/CD pipeline management experience, Proficiency with Git workflows, Bachelor’s or Master’s in Computer Science or related field 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, GraphQL, REST, OAuth, JWT, RBAC, PostgreSQL, MySQL, MongoDB, Docker, Kubernetes, AWS, Azure, GCP, Git, CI/CD, Webpack, Babel, Vite 🏢 Description: 🧩 About the Company Our client is a rapidly growing US-based technology firm with global operations. With a strong commitment to innovation and quality engineering, the company is building a new engineering hub in Warsaw. This is your opportunity to join a high-performing team and play a pivotal role in developing next-generation digital solutions for the private capital markets. 📍 Location & Setup Start remotely and transition to a hybrid model based in Warsaw (3 days/week in the office in the coming months). 🧠 The Role: Senior Full Stack Developer (React & Node.js) We’re looking for an expert-level Senior Full Stack Developer with at least 7 years of professional experience in designing, architecting, and delivering high-performance web applications. You will take ownership of complex technical challenges across both the front-end and back-end, drive architectural decisions, and provide technical leadership and mentorship within the software development lifecycle. 🔧 Key Responsibilities Technical Leadership: Architect and develop scalable, responsive UIs with React.js, Redux, and modern JavaScript (ES6+). System Design: Design, build, and scale advanced server-side applications, microservices architecture, and RESTful/GraphQL APIs with Node.js and Express. Data Architecture: Lead database design, optimization, and integration strategies (PostgreSQL, MySQL, or MongoDB). Quality Assurance: Define testing strategies, write robust unit/integration tests, and establish efficient debugging protocols for the team. DevOps & Deployment: Oversee and optimize CI/CD pipelines, containerization using Docker, and cloud deployments. Agile Mentorship: Lead agile collaboration with product managers, designers, and engineers, while mentoring mid-level and junior developers. Performance: Proactively monitor system performance, identify bottlenecks, and maintain high-availability production-grade applications. Standards: Establish and maintain comprehensive technical documentation and coding standards. 📌 What We’re Looking For Front-End: Expert-level experience with React.js, Hooks, Redux, and complex component-based architecture. Deep mastery of HTML5, CSS3, and ES6+. Advanced configuration and optimization experience with build tools like Webpack, Babel, or Vite. Back-End: Senior-level proficiency in Node.js & Express.js for enterprise applications. Extensive API design and architecture experience (GraphQL highly preferred, alongside REST). Deep understanding and implementation experience with advanced security and authentication protocols: OAuth, JWT, sessions, and RBAC. Databases & DevOps: Proven experience in scaling and optimizing relational and non-relational databases (PostgreSQL, MySQL, or MongoDB). Solid hands-on experience with Docker; Kubernetes experience is highly advantageous. Demonstrated experience designing and deploying applications on cloud platforms (AWS, Azure, or GCP). Advanced proficiency with Git workflows and driving Agile/Scrum methodologies. 🎓 Qualifications Bachelor’s or Master’s in Computer Science or a related field. 7+ years of hands-on experience in full stack development. 2+ years of experience in a senior or technical lead capacity. Proven track record of architecting, deploying, and maintaining high-traffic production applications. 💡 Soft Skills Strategic, analytical thinker and highly effective problem-solver. Strong technical leadership, team collaboration, and cross-functional communication skills. Self-motivated with excellent time management and the ability to drive projects autonomously. Passion for continuous learning, adopting new technologies, and sharing knowledge with the team. 🎁 What’s Offered Competitive salary up to $6,200 USD/month. Hybrid remote role with 3 days form office in the heart of Warsaw Generous Paid Time Off (PTO). Comprehensive full benefits package. The unique chance to shape the technical foundation of a new engineering hub and lead high-impact projects. A supportive, innovation-driven work environment that values technical excellence.

Technology

emagine Polska

Full Stack Developer

Senior

Remote

Warsaw, Poland

160 - 200 PLN

🏢 Summary: Fullstack Developer role focused on building and maintaining a global digital product supporting resale and service operations. The position covers end-to-end ownership of micro frontends and microservices, from development to production deployment. The role emphasizes scalability, performance, cloud infrastructure, and modern development practices. 🗂️ Requirements: Strong backend experience with Java or Kotlin, Solid frontend development experience with React or similar framework, Experience working in AWS cloud environment, Practical knowledge of microservices architecture, Experience with CI/CD pipelines, Ability to work in trunk-based development model, Experience with event-driven systems such as Kafka, Experience with Kubernetes-based deployments 📃 Skills: Java, Kotlin, React, AWS, Kubernetes, Kafka, GitLab, Microservices, Microfrontends, CICD, Trunkbased, Eventdriven 🏢 Description: Join our project and help build a global digital product used by retailers and service advisors around the world. We are looking for an experienced Fullstack Developer to join the team with a product that supports resale operations and service processes by delivering accurate, optimised information to employees across the dealer network. This is a great opportunity for someone who enjoys working across the full application lifecycle, from development to production. You will be part of a team that owns the product end-to-end — from building new functionality to deploying and maintaining it in production. This is a hands-on engineering role where you will work closely with other developers, contribute to a shared codebase, and help ensure the product remains stable, scalable, and high-quality. What you will work on: Developing and maintaining micro frontends and microservices Improving system performance, stability, and scalability Integrating the platform with internal and external services Continuously improving code quality and development practices Contributing throughout the full lifecycle of the application, including production deployment What we are looking for: Strong experience in backend development using Java/Kotlin Solid understanding of frontend development with React or a similar framework Experience working in cloud environments , preferably AWS Practical experience with microservices architecture Experience with CI/CD pipelines and modern software development practices Ability to work in a trunk-based development setup Experience working with event-driven systems , such as Kafka Strong familiarity with AI-assisted and agentic workflows as part of everyday software development Tech stack: Frontend: React, micro frontends Backend: Kotlin & Java, microservices Infrastructure: AWS, Kubernetes CI/CD: GitLab Pipelines Messaging: Kafka

Technology

Remodevs

Fullstack Team Lead (React & Node.js)

Senior

Hybrid

Warsaw, Poland

8,000 - 9,000 USD

🏢 Summary: Senior Full Stack Team Lead role focused on building and scaling web applications using React and Node.js while leading a development team. The position combines hands-on front-end and back-end development with architecture design, API development, and deployment in cloud environments. You will drive technical decisions, ensure code quality, and oversee delivery of scalable, production-ready systems. 🗂️ Requirements: 7+ years full-stack development experience with React and Node.js, 2+ years experience in leadership or senior technical role, Strong experience with React.js, Redux, React Hooks, Strong knowledge of HTML5, CSS3, modern JavaScript, Proficiency in Node.js and Express.js, Experience building REST APIs, Experience with PostgreSQL or MySQL, Experience with authentication methods (OAuth, JWT, sessions), Experience with CI/CD and Docker, Experience working with production systems, Experience with Git, Understanding of Agile/Scrum methodologies 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, REST, GraphQL, PostgreSQL, MySQL, OAuth, JWT, Docker, Kubernetes, AWS, Azure, GCP, Git, CI/CD, Webpack, Babel, Vite, MongoDB 🏢 Description: Overview We are a leading company in AI-based enterprise operations. We provide digital solutions and consulting services that help businesses grow and improve. We use modern technology to make processes simpler, increase efficiency, and create new ways to earn money, especially in private capital markets. Our ecosystem includes three main parts. First, PaaS (Platform as a Service) with the Orion Platform, which helps improve workflows, show useful insights, and support value growth across portfolios. Second, SaaS (Software as a Service), a cloud platform that offers strong performance and smart tools at scale. Third, our Solutions and Consulting Suite, which includes flexible technology solutions to manage, grow, and improve company performance. With more than 10 years of experience, we support fast-growing companies and private equity platforms, turning technology into a real business advantage. Responsibilities and Duties We are looking for an experienced Full Stack Team Lead with strong skills in React and Node.js. The right person has over 7 years of experience building high-quality web applications and has experience leading a team. You will guide developers, work on both front-end and back-end, take part in all stages of development, and support junior team members. Key Responsibilities Team Leadership & Mentorship: Lead and support a team of developers. Help them grow, review code, and give technical advice. Front-End Development: Build and maintain user interfaces using React.js, Redux, and modern JavaScript. Back-End Development: Create strong and scalable server applications and APIs using Node.js and Express. Integration: Work with database engineers to design databases and manage data using MongoDB or SQL. Application Architecture: Design scalable systems and microservices that meet business needs. Testing & Debugging: Write tests, fix issues, and improve performance. Support good testing practices. Deployment: Manage releases using CI/CD tools and Docker. Collaboration: Work with designers, product managers, and developers to create useful solutions. Communicate with both technical and non-technical teams. Maintenance: Monitor systems, fix problems, and improve applications. Documentation: Write and maintain technical documents for systems and APIs. Requirements Front-End: Strong experience with React.js, Redux, React Hooks, and component-based design Good knowledge of HTML5, CSS3, and modern JavaScript Familiar with tools like Webpack, Babel, or Vite Back-End: Strong skills in Node.js and Express.js Experience building and using APIs (GraphQL is a plus, REST is required) Knowledge of authentication methods like OAuth, JWT, and sessions Database: Experience with PostgreSQL or MySQL Additional Skills: Experience with Docker and Kubernetes is a plus Knowledge of cloud platforms like AWS, Azure, or GCP Experience with Git Understanding of Agile/Scrum methods Qualifications At least 7 years of experience in full-stack development with React and Node.js At least 2 years in a leadership or senior role Experience working with live production systems Bachelor’s degree in Computer Science or similar (preferred) Soft Skills Strong problem-solving and analytical thinking Good communication and teamwork skills Ability to work independently and manage tasks well Willingness to learn new technologies and improve continuously Why Join Us? We look for people who solve problems creatively, learn quickly, and enjoy working in an open and diverse team. We work hard, but we also like to enjoy what we do and aim for high results.

Technology

Dawid Wierciak Flow to Grow

Senior Full Stack Developer (Python & React)

Senior

Hybrid

Kraków, Poland

160 - 270 PLN/hr

🏢 Summary: Senior Full Stack Developer role focused on building an enterprise AI agent management platform, with strong emphasis on backend development in Python. The position involves developing scalable web applications using Python and React, designing architecture, building REST APIs, and working on authentication and SSO integrations. The role includes collaboration on technical decisions, mentoring developers, and contributing to production-grade enterprise solutions. 🗂️ Requirements: 5+ years of commercial development experience, Strong Python knowledge, Commercial experience with React, Experience building web applications, Experience with Django, FastAPI or similar frameworks, Experience designing software architecture, Experience building scalable applications, Experience working with production systems, Practical knowledge of REST API, Knowledge of authentication and authorization, English level B2 or higher 📃 Skills: Python, React, Django, FastAPI, Celery, Docker, REST, SSO, API, Microservices 🏢 Description: O projekcie Projekt dotyczy budowy rozwiązania wspierającego organizacje enterprise we wdrażaniu i zarządzaniu agentami AI. Produkt rozwijany jest we współpracy z klientami enterprise i odpowiada na rzeczywiste potrzeby biznesowe. O roli Poszukujemy Senior Full Stack Developera, który dołączy do zespołu rozwijającego aplikację webową dla klientów enterprise. Jest to rola Full Stack z wyraźnym naciskiem na rozwój backendu w Pythonie. Będziesz rozwijać zarówno backend, jak i frontend aplikacji, uczestniczyć w projektowaniu rozwiązań oraz brać udział w decyzjach architektonicznych. Zakres obowiązków rozwój aplikacji webowej z wykorzystaniem Pythona i React, projektowanie i rozwój backendu, rozwój komponentów frontendowych w React, rozwój REST API, rozwój i utrzymanie aplikacji produkcyjnych, projektowanie skalowalnych rozwiązań dla klientów enterprise, praca nad authentication, authorization i integracjami SSO, udział w decyzjach architektonicznych oraz proponowanie rozwiązań, udział w code review i design sessions, współpraca z zespołem przy podejmowaniu decyzji technicznych, wspieranie mniej doświadczonych programistów poprzez dzielenie się wiedzą. Stack technologiczny Python React Django Celery Docker Czego oczekujemy 5 lat lub więcej doświadczenia komercyjnego, bardzo dobrej znajomości Pythona, komercyjnego doświadczenia z React, doświadczenia w tworzeniu aplikacji webowych, doświadczenia z Django, FastAPI lub podobnym frameworkiem, doświadczenia w projektowaniu architektury oprogramowania, doświadczenia w budowaniu skalowalnych aplikacji, doświadczenia w pracy z systemami produkcyjnymi, praktycznej znajomości REST API, znajomości zagadnień związanych z authentication i authorization, bardzo dobrej komunikacji, języka angielskiego na poziomie minimum B2. Dodatkowym atutem będzie doświadczenie z aplikacjami enterprise, znajomość SSO lub federated identity, doświadczenie w tworzeniu Python SDK, doświadczenie z architekturą opartą o API lub mikroserwisy. Model pracy praca w modelu hybrydowym w Krakowie, preferowane 1–3 dni w tygodniu w biurze (możliwe jest indywidualne ustalenie liczby dni). Oferujemy wynagrodzenie: 160–270 PLN/h, współpracę w oparciu o B2B, długoterminową współpracę, realny wpływ na architekturę i rozwiązania techniczne, pracę nad produktem dla klientów enterprise, pracę nad produktem wykorzystującym rozwiązania AI. Proces rekrutacyjny Rozmowa z rekruterem. Rozmowa Cultural Fit. Rozmowa techniczna. Decyzja. Proces nie obejmuje zadania domowego ani live codingu.

Technology

Remodevs

Senior Java Developer

Senior

Hybrid

Warsaw, Poland

5,900 - 6,200 USD

🏢 Summary: Backend-focused Full Stack Developer role centered on designing and building scalable, secure Java-based applications within an Agile environment. The position emphasizes backend development with Spring Boot and microservices, while contributing to CI/CD, cloud deployments, and optionally modern React-based frontend components. You will develop high-performing systems, integrate APIs, and ensure code quality through testing and best practices. 🗂️ Requirements: 5+ years experience as Java Backend or Full Stack Developer, Strong proficiency in Java, Experience with Spring Boot, Hibernate, JPA, Experience building REST APIs and microservices, Knowledge of OAuth2 and JWT authentication, Experience with SQL and NoSQL databases, Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Experience with AWS, Azure or GCP, Bachelor’s or Master’s degree in Computer Science or related field, Experience working in Agile teams 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, Jenkins, GitHubActions, GitLab, Docker, Kubernetes, AWS, Azure, GCP, React, Redux, TypeScript, HTML5, CSS3 🏢 Description: Overview We are a company leveraging AI to optimize business operations. Our mission is to provide digital solutions and consulting services that help companies grow and create value. By using modern technology, we simplify processes, increase efficiency, and discover new revenue opportunities—especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service): A core platform that enhances workflows, provides actionable insights, and supports value creation. SaaS (Software as a Service): A cloud platform offering robust performance and intelligent tools at scale. S&C (Solutions & Consulting): Flexible tools and methodologies to manage, grow, and improve company performance. With over 10 years of experience working with fast-growing companies and private equity businesses, we know how to harness technology to deliver tangible business advantages. Job Description We are looking for a Backend-Focused Full Stack Developer with strong Java expertise. While your main focus will be backend systems, experience with modern frontend technologies (React.js, TypeScript) is a valuable plus. You will join an Agile team to design, build, and maintain scalable, secure, and high-performing applications. Key Responsibilities Backend Development (Primary Focus) Develop and maintain REST APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement secure authentication, authorization, and data handling mechanisms. Design and optimize databases (PostgreSQL, MySQL, MongoDB) for performance and reliability. Integrate with third-party APIs, cloud services, and internal systems. Participate in deployment pipelines using CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD) and containerization (Docker, Kubernetes). Frontend Development (Nice-to-Have) Build responsive UI components using React.js, Redux, and modern JavaScript/TypeScript. Apply best practices in UI/UX design, performance optimization, and cross-browser compatibility. Work with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Code Quality & Testing Write clean, maintainable, and well-documented code. Create unit and integration tests for backend services, and frontend components if applicable. Collaboration & Agile Development Collaborate with designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to process improvement initiatives. Required Skills & Experience Backend Strong proficiency in Java , Spring Boot, Hibernate, JPA, and REST API development. Experience with microservices architecture and API Gateway. Knowledge of authentication/authorization protocols: OAuth2, JWT, sessions. Frontend (Optional / Nice-to-Have) Experience with React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript. Understanding of state management and component-based design. Familiarity with UI libraries/frameworks: Material-UI, Bootstrap, or Tailwind CSS. Database & DevOps SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Cloud platform experience (AWS, Azure, GCP) and containerization (Docker/Kubernetes). Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 5+ years of experience as a Full Stack or Backend Developer (Java-focused). Experience working in Agile teams. Strong problem-solving and analytical skills. Soft Skills Excellent communication and teamwork abilities. Ability to manage multiple tasks in a fast-paced environment. Eagerness to learn new technologies and improve processes.