Full Stack Developer (Java)

🏢 Summary: Full Stack Java Developer role focused on enhancing and modernizing legacy Java systems to support ISO 20022, while developing and maintaining backend services in a distributed, event-driven environment. The position involves full lifecycle development, from requirements analysis to production releases, in a hybrid work model in Warsaw. 🗂️ Requirements: 4+ years of experience as Java or Full Stack Developer, Strong experience with Java and Spring ecosystem, Hands-on experience with Hibernate and DB2, Experience with Apache Kafka and event-driven architectures, Experience with MongoDB, Experience building RESTful APIs and microservices, Experience with Maven multi-module builds, Experience with Docker, Experience with Git and CI/CD pipelines, Experience working with distributed systems and legacy codebases 📃 Skills: Java, Spring, SpringBoot, SpringData, SpringSecurity, Hibernate, DB2, Kafka, KafkaStreams, KafkaConnect, MongoDB, REST, Microservices, Maven, Docker, Git, GitLab, CICD, ISO20022 🏢 Description: For our Client we are looking for a Full Stack Java Developer. Warsaw, hybrid (4 days per week from the office) B2B: 28,000–35,000 PLN per month Key Responsibilities Gather and analyse requirements with business stakeholders Design, plan, implement and test changes with the engineering team Adapt and enhance legacy Java applications for ISO 20022 changes Develop and maintain backend services and integrations Participate in code reviews, UAT support and production releases Continuously improve code quality and system design Requirements 4+ years of experience as a Java / Full Stack Developer Strong hands-on experience with: Java, Spring, Spring Boot (DI, Spring Data, Spring Security) Hibernate, DB2 Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect) MongoDB (document modelling, Spring Data MongoDB) RESTful APIs, microservices, event‑driven architectures Maven (multi-module builds) Docker Git & CI/CD (GitLab CI preferred) Experience working in distributed systems and complex legacy codebases Strong analytical skills and ability to understand complex business logic Good communication skills and ability to work in a global team

🏢 Summary: B2B Full Stack Java Developer role in Warsaw (hybrid) focused on enhancing legacy Java systems for ISO 20022 compliance and building backend services and integrations. The position involves designing, implementing and testing changes in distributed, event‑driven architectures while collaborating with business stakeholders and global teams. Emphasis is placed on code quality, system design and production support. 🗂️ Requirements: 4+ years experience as Java or Full Stack Developer, Strong hands-on experience with Java, Strong hands-on experience with Spring and Spring Boot, Experience with Hibernate and DB2, Experience with Apache Kafka, Experience with MongoDB, Experience building RESTful APIs and microservices, Experience with event-driven architectures, Experience with Maven multi-module builds, Experience with Docker, Experience with Git and CI/CD, Experience working with distributed systems, Experience working with complex legacy codebases 📃 Skills: Java, Spring, SpringBoot, Hibernate, DB2, Kafka, MongoDB, REST, Microservices, Maven, Docker, Git, GitLab, CI/CD 🏢 Description: For our Client we are looking for a Full Stack Java Developer. Warsaw, hybrid (4 days per week from the office) B2B: 28,000–32,000 PLN per month Your responsibilities Gather and analyse requirements with business stakeholders Design, plan, implement and test changes with the engineering team Adapt and enhance legacy Java applications for ISO 20022 changes Develop and maintain backend services and integrations Participate in code reviews, UAT support and production releases Continuously improve code quality and system design Requirements: 4+ years of experience as a Java / Full Stack Developer Strong hands-on experience with: Java, Spring, Spring Boot (DI, Spring Data, Spring Security) Hibernate, DB2 Apache Kafka (producers, consumers, Kafka Streams, Kafka Connect) MongoDB (document modelling, Spring Data MongoDB) RESTful APIs, microservices, event‑driven architectures Maven (multi-module builds) Docker Git & CI/CD (GitLab CI preferred) Experience working in distributed systems and complex legacy codebases Strong analytical skills and ability to understand complex business logic Good communication skills and ability to work in a global team

🏢 Summary: Remote B2B offer for an experienced Java Developer to design and build scalable REST APIs and broker integrations using Spring-based technologies within a microservices architecture. The role focuses on high-quality API development, SQL database management, and system design in a Scrum team. The position involves international collaboration and participation in architecture and integration initiatives. 🗂️ Requirements: Minimum 5 years of experience with Java (8/17/21), Strong knowledge of Spring Framework, Strong knowledge of Hibernate, Experience with REST API design and development, Experience with microservices architecture, Strong SQL and relational database expertise, Knowledge of architectural and design patterns, Experience with Git, Experience with TeamCity, Polish proficiency, English proficiency 📃 Skills: Java, Spring, Hibernate, SQL, REST, Microservices, Git, TeamCity, Maven, Scrum, RelationalDatabases, DesignPatterns 🏢 Description: Work model: remote, visit in the office once a quater in Warszawa Rate: up to 150 PLN/h (B2B contract) We are looking for a motivated Java Developer to join our team focused on building and evolving API integrations with external brokers. The ideal candidate will possess a strong background in Java, Spring-based technologies, and a deep understanding of systems integration and microservices architecture. You will contribute significantly to developing high-quality, maintainable APIs that enable seamless integration with various partners across multiple international markets. We work in a cross-functional team utilizing Scrum methodology. Main Responsibilities Design and build high-quality APIs using Java (8/17/21) and Spring-based technologies, ensuring scalability and maintainability. Develop and enhance broker integrations, contributing to business growth and market expansion. Contribute to modern service-oriented architecture design applying microservices knowledge. Manage SQL databases and ensure data consistency and reliability in applications. Utilize tools like Git, Maven, and TeamCity for continuous integration and code delivery. Collaborate on frontend API usability to ensure practical and well-structured solutions. Communicate effectively in Polish and English to facilitate international collaboration. Key Requirements At least 5 years of experience with Java (8/17/21 ) Deep knowledge of the Spring Framework and Hibernate. Strong SQL and relational database expertise. Strong problem-solving skills and proactive attitude. Experience in clean REST API design and development. Familiarity with microservices architecture. Knowledge of architectural and design patterns. Experience with Git and TeamCity. Polish and English proficiency. Nice to Have Experience with React for effective collaboration with frontend developers. Experience with large-scale applications using Maven. Knowledge of Apache Kafka. Experience with Domain-Driven Design (DDD) or Hexagonal architecture. Experience in decoupling monolithic applications. Background in the fintech industry. Recruitment process: 1. Live coding session 2. System design session 3. HR interview

🏢 Summary: B2B contract for an experienced Full Stack Developer to build and modernize a microservices-based application using Spring Boot and Angular. The role involves adapting an existing platform to new business needs, including multi-tenancy, and designing secure authentication and authorization mechanisms. You will deliver scalable, production-ready solutions in close collaboration with stakeholders. 🗂️ Requirements: Strong experience with Java, Strong experience with Spring Boot, Strong experience with Angular, Experience with microservices architecture, Experience designing authentication and authorization mechanisms, Knowledge of application security principles, Ability to design secure application architecture, Experience adapting and extending existing codebases, Ability to deliver production-ready code 📃 Skills: Java, Spring, SpringBoot, Angular, Microservices, AuthN, AuthZ, Security, Architecture, Multitenancy 🏢 Description: Location: Warsaw, hybrid 3days/office Contract Type: B2B, 6 months Salary: up to 1500PLN net+vat/DAY - negotiable We’re looking for an experienced Full Stack Developer to help build a new application based on a microservices architecture using Spring Boot and Angular . You’ll adapt an existing internal platform to new business needs, including multi-tenancy , and work closely with stakeholders to translate requirements into high-quality solutions. What you’ll do Develop and extend a microservices-based application using Java, Spring Boot, and Angular Customize and modernize an existing codebase for new business requirements Design and implement authentication & authorization and secure application architecture Collaborate with internal customers to turn business needs into technical designs and user stories Ensure high standards of quality, performance, and maintainability What you bring Strong experience in Java, Spring Boot, and Angular Solid understanding of application architecture, security, AuthN/AuthZ enterprise or banking background preferred Excellent communication skills Proven ability to work end-to-end: from requirements to production-ready code If you enjoy building scalable enterprise applications and working closely with stakeholders, we’d love to hear from you

🏢 Summary: Senior Backend Java Developer role focused on designing and building scalable, high-performance backend systems using Java and Spring Boot in a cloud-native environment. The position involves developing enterprise-grade solutions, ensuring performance and security, and supporting containerized deployments. The role requires strong experience with modern backend technologies and infrastructure tools. 🗂️ Requirements: 8+ years of backend development experience, Strong experience with Java 17+, Strong experience with Spring and Spring Boot, Experience with Spring Security, Experience with SQL databases, Experience with Maven, Experience with Git and CI/CD pipelines, Experience with testing frameworks (JUnit, AssertJ, Hamcrest), Experience with Kubernetes and Helm, Experience with Bash or Shell scripting, Experience with cloud-native applications, Experience in enterprise environments 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SQL, Maven, Git, CICD, JUnit, AssertJ, Hamcrest, Kubernetes, Helm, Bash, Shell, Docker, PostgreSQL 🏢 Description: Senior Backend Java Developer Location: Warsaw, Poland (hybrid – 2 days/week in the office) About the Role We’re looking for a Senior Backend Java Developer to design and build scalable, high-performance backend systems for international products. You’ll work in a collaborative environment, contribute to architectural decisions, and mentor other engineers. Responsibilities Design, develop, and maintain backend systems using Java 17+ and Spring Boot Ensure scalability, performance, and security of solutions Work with SQL databases (e.g. PostgreSQL) Support deployments using Docker, Kubernetes, and Helm Use Bash/Shell for automation and integration tasks Lead technical discussions and mentor team members Collaborate in Agile (Scrum) teams and communicate in English Requirements Strong experience with Java 17+, Spring / Spring Boot / Spring Security Experience with cloud-native applications Maven, SQL, Git (GitHub, CI/CD) Testing frameworks (JUnit, AssertJ, Hamcrest) Kubernetes, Helm Bash/Shell scripting English B2/C1 Experience in enterprise environments 8+ years of backend development experience Nice to Have PostgreSQL, Hibernate/JPA Kafka, event-driven architecture Microservices architecture Python Knowledge of C or Go CI/CD tools, JIRA Monitoring tools (Grafana, Prometheus, Kibana) Security best practices (OWASP) Qualifications Degree in Computer Science or related field

🏢 Summary: Senior Java Full-Stack Developer role for international projects, focused on end-to-end development of web applications in a cloud-based environment. The position involves backend and frontend development, design and testing activities, and collaboration within agile teams. It is a fully remote B2B contract with long-term cooperation. 🗂️ Requirements: Bachelor’s degree in Engineering, IT, Science, or related technical field, Minimum 5 years of commercial experience in corporate IT, Strong experience with Java and Java frameworks, Commercial experience with frontend technologies, Solid knowledge of JavaScript, HTML5, CSS3, Experience with Angular, Knowledge of databases and SQL, Experience with REST and SOAP web services, Experience with AWS or Azure, Knowledge of Clean Code principles, Experience with unit testing, Experience with source code management, Experience with CI/CD and automated deployments, Very good English (spoken and written), Experience in agile (Scrum) environments 📃 Skills: Java, Spring, JavaScript, HTML5, CSS3, Angular, SQL, REST, SOAP, AWS, Azure, CI/CD, Git, Scrum 🏢 Description: Senior Java Full-Stack Developer – Remote Contract type: B2B Hourly rate: 160–170 PLN/h Location: Remote We are looking for an experienced Senior Java Full-Stack Developer to join international implementation projects. The role involves end-to-end development of web applications, close collaboration with agile teams, and active participation in design and testing activities. The position is well suited for a developer who values clean code, quality, and teamwork in a cloud-based environment. Responsibilities Work as a Senior Java Full-Stack Developer across multiple implementation streams Develop and maintain web-based applications using Java and modern frontend technologies Write and maintain unit tests to ensure software quality Collaborate with agile team members to achieve project and client goals Participate in design reviews, testing activities, and technical discussions Requirements Bachelor’s degree in Engineering, IT, Science, or another technical field Minimum 5 years of commercial experience in a corporate IT environment Strong experience with Java and commonly used Java frameworks Commercial experience with frontend technologies and web-based applications Solid knowledge of JavaScript, HTML5, CSS3, and responsive single-page application design Experience with Angular Knowledge of databases and SQL Experience with web services and APIs (REST, SOAP) Experience deploying applications on cloud platforms such as AWS or Azure Knowledge of Clean Code principles and unit testing Experience with source code management, CI/CD, and automated deployments Very good English, both spoken and written Experience working in international and agile (Scrum) environments Strong communication and collaboration skills Nice to have Experience with Kafka or RabbitMQ Hands-on experience with microservices architecture Knowledge of Docker and Kubernetes Relevant certifications (Java, Spring, SQL, AWS, Azure) Knowledge of German or another European language Benefits Medicover healthcare package Multisport card Access to an e-learning platform Group life insurance We offer Fully remote cooperation Competitive hourly rate: 160–170 PLN/h (B2B) Long-term cooperation in international projects Modern technology stack and agile working environment

🏢 Summary: Junior Backend Java Developer role focused on building and maintaining scalable backend systems using modern Java and Spring technologies in an international, Agile environment. The position involves developing secure, high-quality applications and collaborating within a hybrid work model. 🗂️ Requirements: Java 17+, Spring / Spring Boot / Spring Security, Maven, SQL, Git (GitHub, CI/CD basics), Experience with unit testing, English B2/C1, Around 2 years of commercial experience, Degree in Computer Science or related field 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, Maven, SQL, Git, GitHub, CICD, UnitTesting 🏢 Description: Junior Backend Java Developer Location: Warsaw, Poland (hybrid – 2 days/week in the office) About the Role We’re looking for a Junior Backend Java Developer to join a team building scalable, modern backend systems for international products. You’ll work in a collaborative environment with a strong focus on learning, ownership, and quality. Responsibilities Develop and maintain backend applications using Java 17+ and Spring Boot Ensure performance, scalability, and security of solutions Work with SQL databases (e.g. PostgreSQL) Support deployments using Docker, Kubernetes, and Helm Use Bash/Shell for automation tasks Collaborate in Agile (Scrum) teams and communicate in English Requirements Java 17+, Spring / Spring Boot / Spring Security Maven, SQL, Git (GitHub, CI/CD basics) Experience with unit testing English B2/C1 Around 2 years of commercial experience Nice to Have PostgreSQL, Hibernate/JPA Kubernetes, Helm Kafka, microservices Bash/Shell or Python CI/CD tools, JIRA Monitoring tools (Grafana, Prometheus) Security basics (OWASP) Qualifications Degree in Computer Science or related field

🏢 Summary: Hybrid Java Fullstack Developer role focused on building and maintaining scalable web applications using Java and React.js. The position involves developing backend services, modern frontend interfaces, and RESTful APIs while supporting CI/CD processes. Work model includes two days onsite in Warsaw with the remaining days remote. 🗂️ Requirements: Strong experience with Java, Solid experience with React.js, Experience building and consuming REST APIs, Strong knowledge of JavaScript, Strong knowledge of HTML, Strong knowledge of CSS, Experience with Git, Experience with CI/CD pipelines, Familiarity with Agile environments, English proficiency 📃 Skills: Java, React, REST, JavaScript, HTML, CSS, Git, CI/CD, Spring, TypeScript, SQL, Docker 🏢 Description: We are looking for an experienced Java Fullstack Developer to join our development team in Kraków. In this role, you will work on building and maintaining scalable web applications, contributing to both backend services and modern frontend interfaces. This position follows a hybrid working model with two/three days per week onsite in Warsaw . Key Responsibilities Develop and maintain backend services using Java Build responsive and modern user interfaces using React.js Design and implement RESTful APIs Collaborate with product managers, designers, and engineers to deliver new features Write clean, maintainable, and efficient code Participate in code reviews and contribute to development best practices Troubleshoot and resolve technical issues Support integration and deployment through CI/CD pipelines Required Skills and Experience Strong experience with Java Solid experience with React.js Experience building and consuming REST APIs Strong knowledge of JavaScript, HTML, and CSS Experience with Git and modern development workflows Familiarity with Agile development environments Good communication skills in English Nice to Have Experience with Spring Boot Experience with TypeScript Knowledge of SQL databases Familiarity with Docker or cloud platforms Work Model Hybrid: 2 days onsite in Warsaw , remaining days remote.

🏢 Summary: B2B contract opportunity for a Java Fullstack Developer with a strong backend focus (60–70%) to build and maintain applications within a Digital Platform using a modern tech stack. The role involves developing backend and frontend components, participating in code reviews and technical discussions, and contributing to architectural decisions in a distributed team environment. 🗂️ Requirements: Core Java 11, Advanced Java (JDBC, Collections, Serialization, Memory management), Spring framework, JPA (Hibernate), RDBMS knowledge, Strong SQL skills, RESTful web services, XML and JSON, OpenAPI (Swagger), JavaScript, Typescript, HTML, CSS, Angular 14+, RxJS, Git, Maven, npm, Frontend security (OWASP), Backend security knowledge 📃 Skills: Java, JDBC, Collections, Serialization, Spring, JPA, Hibernate, SQL, RDBMS, REST, XML, JSON, OpenAPI, Swagger, JavaScript, Typescript, HTML, CSS, Angular, RxJS, Git, Maven, npm, OWASP 🏢 Description: For one of our clients, we are looking for a Java Fullstack Developer (m/f/n). As part of the Digital Platform team, you will work on several applications utilizing a modern technology stack. You will get the opportunity to not only learn and grow but also to contribute and be involved in technical discussions and decision making. You will be working in a very nice, dynamic, multi-cultural and geographically distributed team and will receive a lot of support during your onboarding phase. The skill split is 60/40 or 70/30, with a stronger focus on backend. Responsibilities Development (Backend and Frontend) on several applications within the Digital Platform scope, both on new and existing applications Perform code reviews Participate in SCRUM events Participate in technical analysis and discussions Be proactive and take initiative Work closely with your colleagues and communicate Requirements Core Java V11, Advanced Java (JDBC, Collections, Serialization, Memory management) Web communication: XML, JSON, REST Spring framework JPA (Hibernate) Knowledge of RDBMS, specifically SQL skills Web communication: experience with OpenAPI specifications (Swagger) Proficiency in Web languages (JavaScript, Typescript, HTML, CSS) Proficiency in Angular 14+ framework (SPA) Knowledge of reactive programming (RxJS) Good understanding of GIT, Maven, and npm Understanding of Agile Workflow Understanding of Frontend Security topics (owasp) Understanding of Backend Security topics Fluency in English (B2 level) Nice to have: Experience with the Redux pattern (NgRX) & store management Experience with the Nx build system library Build and Deployment automation (Jenkins, Sonar) Microservice architecture and development (Spring Boot) Experience in leading a (geographically distributed) technical team Experience being involved in technical design Our offer: Rate: 130 - 140 PLN/h net + VAT B2B contract via SHIMI Hybrid – 2 days per week from the Warsaw or Kraków office Start: ASAP – notice period up to 2 weeks

🏢 Summary: Senior Full Stack Developer role focused on building and evolving modern, scalable enterprise applications using Java, Angular, and Kafka within a microservices and event-driven architecture. The position involves end-to-end feature development, system integration, and contribution to architectural decisions in a hybrid work model. Long-term B2B engagement on secure, high-performance systems. 🗂️ Requirements: Strong experience as Full Stack Developer, Hands-on experience with Java 17–21, Experience with Spring Boot microservices, Strong experience with Angular, Strong experience with TypeScript, Practical experience with Kafka, Experience with event-driven architecture, Good knowledge of SQL, Experience with Oracle database, Experience with Redis, Knowledge of OAuth2 and OIDC, Understanding of OWASP security practices, Experience with CI/CD pipelines, Experience with GitLab CI or Jenkins, Familiarity with Docker, Familiarity with Kubernetes 📃 Skills: Java, SpringBoot, Angular, TypeScript, Kafka, Microservices, SQL, Oracle, Redis, OAuth2, OIDC, OWASP, GitLab, Jenkins, Docker, Kubernetes 🏢 Description: In Cyclad we work with top international IT companies in order to boost their potential in delivering outstanding, cutting-edge technologies that shape the world of the future. We are currently looking for an experienced senior Full Stack Developer (Java / Angular / Kafka) to join a hybrid development team working on modern, scalable, and secure enterprise applications based on microservices and event-driven architecture Project information: Type of project: IT services Office location: Warsaw, Poland Work mode: Hybrid (approx. 50% on-site per month) Budget: 140-170 PLN net/ h- b2b Project length: Long-term Only candidates with citizenship in the European Union and residence in Poland Start date: ASAP (depending on candidate’s availability) Project scope: Design and develop full-stack features (frontend + backend) Design, develop, and maintain full-stack applications using Java and Angular Build and evolve microservices using Spring Boot (Java 17–21) Develop event-driven systems using Kafka Contribute to SPA frontend development with Angular and TypeScript Integrate systems and ensure smooth data flow across services Participate in architecture design and technical decision-making Implement secure authentication and identity management (OIDC, OAuth2) Write and maintain automated tests and CI/CD pipelines Optimize performance, scalability, and maintainability of existing systems Collaborate with international stakeholders in an Agile environment Competence demands: Strong experience as a Full Stack Developer (mandatory) Hands-on expertise in Java 17–21 and Spring Boot microservices Strong experience with Angular and TypeScript (SPA development) Practical experience with Kafka and event-driven architectures Good knowledge of SQL (Oracle) and Redis Understanding of secure development practices (OAuth2, OIDC, OWASP) Experience with CI/CD tools (GitLab CI or Jenkins) Familiarity with Docker and Kubernetes Strong problem-solving and analytical skills Excellent English communication skills Nice to have: Node.js, Python, Maven, AI-assisted development tools We offer: Hybrid working model Full-time job agreement based on b2b Private medical care with dental care (covering 70% of costs) Multisport card (also for an accompanying person) Life insurance