Backend Developer - Java/Kotlin

🏢 Summary: Backend Software Developer responsible for building and maintaining Java/Spring Boot microservices in a high-availability environment. The role involves designing and implementing REST APIs, contributing to technical analysis, ensuring code quality, and supporting production systems. You will work in an Agile team, collaborating on scalable backend solutions and continuous improvement. 🗂️ Requirements: Minimum 3 years of commercial experience as Java Developer or Kotlin Developer, Practical knowledge of Spring Boot, Experience with microservices architecture, Knowledge of design patterns and clean code practices, Experience with Git or GitLab, Knowledge of CI/CD processes, Experience working in Agile/Scrum 📃 Skills: Java, Kotlin, Spring, SpringBoot, REST, Microservices, Git, GitLab, CI/CD, Kafka, RabbitMQ, IBMMQ, KafkaStreams, Flink, Hazelcast, Oracle, PostgreSQL, Redis, Docker, DevOps 🏢 Description: O projekcie: Dołącz do zespołu rozwijającego nowoczesne rozwiązania backendowe oparte o architekturę mikroserwisową. Poszukujemy Software Developera, który będzie uczestniczył zarówno w tworzeniu nowych funkcjonalności, jak i rozwoju istniejących komponentów wykorzystywanych w środowisku o wysokiej skali i dostępności. Zakres obowiązków: rozwój i utrzymanie aplikacji backendowych w technologii Java/Spring Boot, projektowanie i implementacja mikroserwisów, tworzenie oraz rozwój REST API, udział w analizie wymagań i projektowaniu rozwiązań technicznych, przygotowywanie testów i dbanie o jakość kodu, udział w code review, monitorowanie działania aplikacji oraz rozwiązywanie problemów produkcyjnych, tworzenie i utrzymywanie dokumentacji technicznej, współpraca z analitykami, testerami i innymi developerami w środowisku Agile. Wymagania: minimum 3 lata doświadczenia komercyjnego jako Java Developer lub Kotlin Developer, praktyczna znajomość Spring Boot, doświadczenie w pracy z architekturą mikroserwisową, znajomość wzorców projektowych i dobrych praktyk programistycznych, doświadczenie w pracy z Git/GitLab, znajomość procesów CI/CD, umiejętność analitycznego rozwiązywania problemów, doświadczenie w pracy w metodykach Agile/Scrum. Mile widziane: doświadczenie z Kafka, IBM MQ lub RabbitMQ, znajomość frameworków przetwarzania strumieniowego (Kafka Streams, Flink, Hazelcast), doświadczenie z Oracle lub PostgreSQL, znajomość Redis, doświadczenie w środowiskach kontenerowych i DevOps.

🏢 Summary: Backend Developer role focused on designing and building scalable, cloud-based applications using Java and Spring Boot in a microservices architecture. The position involves developing and deploying distributed, event-driven services on Azure using modern containerization and API technologies. The offer emphasizes building reliable, high-quality backend systems with up-to-date cloud-native practices. 🗂️ Requirements: Strong Java development experience, Experience with Spring Boot, Experience with microservices architecture, Experience with cloud-native applications, Familiarity with Azure, Knowledge of Kafka or similar messaging systems, Understanding of GraphQL or REST APIs, Experience with Docker, Experience with Kubernetes 📃 Skills: Java, Spring, SpringBoot, Microservices, Azure, Kafka, GraphQL, REST, Docker, Kubernetes 🏢 Description: We are seeking a talented Backend Developer to join our team, contributing to the design and development of modern, cloud-based applications. The role focuses on building scalable and maintainable services using up-to-date technologies and best practices. Key Responsibilities: Develop and maintain backend services using Java and Spring Boot . Build and support microservices solutions for distributed systems. Work with cloud platforms such as Azure , including event-driven architectures. Implement and consume APIs using GraphQL or REST. Package and deploy applications using Docker and Kubernetes . Collaborate with team members to deliver reliable, high-quality software. Required Skills & Experience: Strong background in Java development with Spring Boot . Experience with microservices and cloud-native applications. Familiarity with Azure , Kafka , or similar messaging/event systems. Understanding of API design ( GraphQL /REST). Practical experience with containerization ( Docker , Kubernetes ). Nice to Have: Knowledge of CI/CD practices and automated deployments. Experience with monitoring, logging, or observability in distributed systems.

🏢 Summary: Part-time Backend Developer role for early-career candidates or students, focused on building and maintaining web applications using Python, Django, and microservices architecture. The position involves developing, testing, debugging, and documenting backend solutions, as well as participating in code reviews. It offers hands-on experience in modern backend development within a collaborative team environment. 🗂️ Requirements: Experience with Python, Experience with Django framework, Knowledge of RESTful APIs, Knowledge of microservices architecture, Experience with SQL, Experience with PostgreSQL, Knowledge of data modeling, Knowledge of data warehouse concepts, Knowledge of software testing methodologies, Ability to create unit tests, Understanding of clean code principles, Familiarity with design patterns, Ability to read technical documentation in English, Adherence to software development best practices 📃 Skills: Python, Django, REST, Microservices, SQL, PostgreSQL, APIs, UnitTesting, IntegrationTesting, SystemTesting, DataModeling, DataWarehouse, GitHub, GitLab 🏢 Description: Who we are looking for: We are looking for a Backend Developer, available for at least half-time, to join our team. If you are at the beginning of your professional career or currently studying, this job is for you. Responsibilities: implementing and developing software based on Python, Django, and microservices technologies, designing and developing web applications, running, testing, and debugging implemented software, creating unit tests, documenting the source code you create, conducting code reviews of source code written by other team members. Requirements: experience with Python and the Django framework, knowledge of RESTful APIs, microservices architecture, and best practices in API design, experience with SQL, especially PostgreSQL, data modeling, and data warehouse concepts, English proficiency sufficient to read technical documentation, creative, solution-oriented problem-solving skills, knowledge of software testing methodologies, including unit, integration, and system testing, openness toward others and the ability to work in a team, willingness to learn new technologies, adherence to software development best practices, knowledge and application of clean code principles, and familiarity with design patterns. Nice to have: knowledge of industry trends, emerging technologies, and best practices in software development, personal projects in your portfolio, familiarity with code repository management platforms such as GitHub or GitLab, documented ability to lead and comprehensively manage complex projects, from initial planning and scope definition through successful implementation and delivery, ensuring timely execution and alignment with business goals. We offer: sports card co-funding, company events, opportunities to learn and gain experience, prospects of working on interesting and diverse projects, participation in industry events, the possibility to work 100% remotely.

🏢 Summary: Opportunity for a Senior Java Backend Developer to build and maintain a secure, large-scale public platform based on microservices within the financial services sector. The role focuses on developing business-critical backend services, contributing to architectural decisions, and improving deployment and engineering practices. Ideal for experienced engineers who combine strong Java expertise with architectural thinking and a proactive approach to system optimization. 🗂️ Requirements: 6–10 years of professional software development experience, Strong expertise in Java backend development, Experience with microservices architecture, Understanding of distributed systems, Experience in system design and software architecture, Ability to work with secure, large-scale systems, Experience improving deployment processes and system reliability 📃 Skills: Java, Microservices, DistributedSystems, SystemDesign, SoftwareArchitecture, REST, Git, Maven, Gradle, Python, Cloud, DevOps 🏢 Description: Senior Java Backend Developer 📍 Location: Wrocław, Poland (Hybrid – 3 days onsite) 📈 Experience: 6–10 years We are currently looking for an experienced Java Backend Developer for our client operating in the financial services sector . The successful candidate will join a team responsible for developing and maintaining a secure, large-scale public platform built on a microservices architecture. This role offers the opportunity to work on business-critical systems where reliability, scalability, and security are key priorities. Beyond feature development, the team is focused on addressing challenges related to architecture, deployment practices, and engineering processes. Therefore, we are looking for someone who combines strong hands-on development skills with architectural thinking and a proactive approach to problem-solving. Key Responsibilities Design and develop new backend features and services using Java Maintain and enhance a secure, customer-facing platform Work within a modern microservices ecosystem Contribute to architectural improvements and technical decision-making Help optimize deployment processes, system reliability, and development workflows Identify technical challenges and propose scalable, long-term solutions What We're Looking For 6–10 years of professional software development experience Strong expertise in Java backend development Solid understanding of microservices architecture and distributed systems Experience with system design and software architecture Strong analytical and critical-thinking skills Ability to understand technical concepts deeply and make informed engineering decisions A proactive mindset and willingness to improve existing systems, processes, and practices Nice to Have Experience with Python Exposure to cloud environments and modern DevOps practices This opportunity is particularly suited to engineers who enjoy working on complex backend systems, influencing architectural decisions, and helping teams improve the way software is designed, built, and deployed.

🏢 Summary: The offer is for a Java Backend Developer role focused on building and maintaining microservices-based systems using Java and Spring technologies. The position involves developing REST APIs, working with containerized applications, and contributing to Agile delivery processes. The role centers on backend engineering, technical design, and collaboration within cross-functional teams. 🗂️ Requirements: Minimum 3+ years professional experience in backend development, Proficiency in Java 8+, Strong experience with Spring Boot and Spring technologies, Experience building microservices, Experience working with REST APIs, Knowledge of HTTPS, SFTP, REST and SOAP protocols, Understanding of microservices architecture and containerization, Experience with Kafka, Experience with Git and GitHub, Experience with Maven and Jenkins, Experience with MySQL and SQL databases, Familiarity with Linux, Experience working in Agile/Scrum environments 📃 Skills: Java, Spring, SpringBoot, REST, Microservices, Kafka, HTTPS, SFTP, SOAP, Linux, Git, GitHub, Maven, Jenkins, Jira, MySQL, SQL, Containerization, Agile 🏢 Description: Job Description: We are looking for skilled Java Backend Developers with strong experience in Java, Spring technologies, and microservices architecture. The ideal candidate will have hands-on expertise in backend development, REST APIs, containerized applications, and Agile delivery environments. Qualifications: Minimum 3+ years of relevant professional experience Proficiency in Java 8+, REST APIs, Spring Boot, and Spring technologies Experience in building microservices and working with Kafka Solid understanding of HTTPS, SFTP, REST API, and SOAP protocols Familiarity with Linux operating systems Strong understanding of microservices architecture and containerization Knowledge of Agile frameworks and principles Experience with Git/GitHub, GitHub Actions, Maven, Jenkins, and Jira Competence with MySQL and SQL databases Strong analytical and problem-solving skills Excellent written and verbal communication skills Ability to collaborate effectively with Product, QA, DevOps, and Agile/Scrum teams Mandatory Skills: Java (Spring) REST APIs Spring Boot and Spring Technologies HTTPS, SFTP, REST API, and SOAP protocols Microservices architecture and containerization Git/GitHub, GitHub Actions, Maven, Jenkins, Jira MySQL and SQL databases Desired Skills: Strong analytical and troubleshooting abilities Excellent communication skills Team collaboration experience within Agile/Scrum environments Roles & Responsibilities: Contribute to technical design and engineering activities Develop strong domain expertise within the project Analyse functional and technical requirements Support architecture and design discussions Collaborate with Architecture and Business teams Participate in development, design, code reviews, and implementation Follow engineering best practices and support continuous improvement initiatives Out of Scope: Creating product requirements Acting as Scrum Master or Product Owner Project Details: Primary focus is on Java backend development.

🏢 Summary: The offer is for an experienced Java Developer to design, develop, and maintain scalable backend systems and microservices in an international, hybrid work environment. The role focuses on building high-performance, secure enterprise applications, contributing to architecture decisions, and supporting CI/CD and DevOps practices. It is suited for engineers experienced in modern Java ecosystems and distributed systems. 🗂️ Requirements: Commercial experience in Java software development, Strong knowledge of Java and Spring Boot, Experience building RESTful APIs and microservices, Knowledge of Spring Framework, Hibernate, and JPA, Experience with relational databases (Oracle or PostgreSQL), Understanding of software design principles and application architecture, Experience with Git, Familiarity with Docker and CI/CD tools, Experience working in Agile (Scrum/Kanban) environments 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, Oracle, PostgreSQL, Git, Docker, CICD, Agile, Scrum, Kanban 🏢 Description: 📍 Location: Kraków (Hybrid – 6–8 days per month in the office) 📄 Contract Type: B2B / Employment Contract 🌍 International Environment About the Role We are looking for an experienced Java Developer to join a dynamic team delivering scalable, enterprise-grade solutions. You will be involved in designing, developing, and maintaining modern backend systems, contributing to architecture decisions, and building robust applications that support critical business processes. This is an excellent opportunity for engineers who enjoy working with modern technologies, microservices, cloud-ready solutions, and high-performance distributed systems. Responsibilities Design, develop, and maintain scalable backend applications and microservices using Java technologies. Build and enhance secure, reliable, and high-performing APIs. Participate in system architecture and technical design discussions. Develop high-quality, maintainable, and well-tested code. Collaborate with cross-functional teams to deliver business-critical solutions. Troubleshoot, analyze, and resolve application and production issues. Perform code reviews and contribute to engineering best practices. Support application performance, scalability, and reliability initiatives. Participate in Agile ceremonies, including sprint planning, refinement, and retrospectives. Contribute to CI/CD processes and DevOps practices. Requirements Commercial experience in software development using Java. Strong knowledge of Java and Spring Boot. Experience building RESTful APIs and microservice-based applications. Good understanding of Spring Framework, Hibernate, and JPA. Experience working with relational databases such as Oracle or PostgreSQL. Familiarity with NoSQL databases is a plus. Understanding of software design principles and application architecture. Experience with Git and modern software development practices. Familiarity with Docker and CI/CD tools. Experience working in Agile environments (Scrum/Kanban). Strong analytical and problem-solving skills. Good communication skills and ability to work collaboratively within a team. Nice to Have Experience with cloud platforms such as AWS, Azure, or GCP. Knowledge of Kubernetes and container orchestration. Exposure to frontend technologies such as React, Angular, or JavaScript. Experience with event-driven architectures and messaging systems. Understanding of security best practices in software development. What We Offer Opportunity to work on modern, large-scale enterprise solutions. Long-term projects in an international environment. Flexible hybrid working model. Exposure to modern technologies, cloud solutions, and microservices architecture. Professional growth opportunities and access to technical challenges. Collaborative culture focused on quality, innovation, and continuous improvement. Employment contract or B2B cooperation model.

🏢 Summary: The role involves developing and maintaining scalable backend services for business-critical applications using Java within an agile environment. The position focuses on building RESTful APIs, implementing persistence layers, and ensuring system quality and stability. The developer collaborates on code reviews, debugging, and continuous improvement of backend solutions. 🗂️ Requirements: Strong experience with Java 17+, Hands-on experience with Spring, Hands-on experience with Spring Boot, Knowledge of Hibernate and ORM concepts, Experience with PostgreSQL, Experience with Git version control platforms, Strong debugging skills, Experience in agile development environments 📃 Skills: Java, Spring, SpringBoot, Hibernate, PostgreSQL, REST, Git, ORM 🏢 Description: Backend Developer (Java) We are looking for a Backend Developer to join a development team responsible for building and maintaining backend services for business-critical applications. The role focuses on developing scalable, maintainable solutions and contributing to the overall quality and stability of the system within an agile setup. Responsibilities: Develop and maintain backend services using Java 17+ Design and implement RESTful APIs with Spring and Spring Boot Work with relational databases, including schema design and query optimization in PostgreSQL Implement persistence layers using Hibernate Debug, troubleshoot, and resolve backend issues Collaborate with the team using a GitHub-like platform, including code reviews and version control Participate in agile ceremonies and contribute to continuous improvement Requirements: Strong experience with Java 17+ Hands-on experience with Spring and Spring Boot Knowledge of Hibernate and ORM concepts Experience working with PostgreSQL Familiarity with GitHub-like platforms and team workflows Strong debugging and problem-solving skills Experience working in agile development environments

🏢 Summary: Backend Developer role focused on designing and building scalable, secure microservices and APIs using Java and Spring Boot in a cloud-oriented environment. The position emphasizes strong data modeling, architecture design, and CI/CD-driven delivery within Agile teams. The contractor will develop resilient backend solutions and ensure high code quality and reliability. 🗂️ Requirements: Hands-on experience with API and Microservices development in Java or Spring Boot, Proficiency in Java/J2EE application development, Experience with Spring Framework and Hibernate JPA, Experience building and consuming REST web services, Experience working with XML and JSON, Experience with relational or NoSQL databases (Oracle, PostgreSQL, MongoDB), Experience with CI/CD pipelines and Jenkins, Experience with Docker and Git, Unix proficiency, Experience working in Agile methodologies (Scrum or Kanban) 📃 Skills: Java, Spring, SpringBoot, J2EE, Hibernate, JPA, REST, XML, JSON, Oracle, PostgreSQL, MongoDB, Jenkins, Docker, Git, Unix, CICD, Microservices, Agile, Scrum, Kanban 🏢 Description: Location : Cracow Mode : Hybrid (6 days per month at the office - flexible) Contract : B2B Rate : 160-170 PLN/h Introduction & Summary We are seeking a skilled Backend Developer who possesses a deep knowledge of data modeling and architecture. The ideal candidate should have extensive experience in API development using core Java and Spring Boot, with a strong grasp of security principles and Agile methodologies. The role requires an analytical mindset, capable of designing resilient and scalable solutions while working cross-functionally to foster collaboration and innovation. Main Responsibilities Ensure proper definition and architecture of non-functional requirements in design. Develop and grow skills in designing cloud-based, secure, and adaptable solutions. Build scalable, highly reliable product features through effective software design and implementation. Apply problem-solving and analytical skills to diverse challenges. Interact with cross-functional teams for scalable solution production. Estimate engineering efforts and develop realistic schedules. Identify and resolve complex production issues efficiently. Conduct comprehensive design and code reviews and perform unit testing. Utilize source control and bug tracking systems responsibly. Key Requirements Hands-on experience in API and Microservices development using core Java and/or Spring Boot . Proficient in application development using Java/J2EE and related technologies, including Spring Framework and Hibernate JPA. Experience in developing reusable APIs and consuming web services (REST), as well as processing data formats like XML/JSON. Expert knowledge of Agile/Scrum/Kanban development methodologies and experience with databases (Oracle, Postgre, MongoDB). Extensive knowledge of CI/CD deployment pipelines, including Jenkins, Docker, shell scripting, and GIT with Unix proficiency. Nice to Have Experience in JavaScript frameworks such as ReactJs, Node JS, Angular, and jQuery. Familiarity with JavaScript build tools and dependency management. Experience in creating responsive designs using frameworks like Bootstrap. Knowledge of GCP, GKE, AWS is an advantage. Experience or knowledge in system architecture and solution design. Hands-on experience in Python, Machine Learning, and Data Science.

🏢 Summary: Role for a Mid+/Senior Java Backend Developer focused on designing and building scalable backend systems and REST APIs in a microservices architecture. The position involves architectural decisions, code quality ownership, and collaboration in an international Agile environment. Opportunity to impact global digital products and engineering standards. 🗂️ Requirements: 6+ years experience as Java Developer, Strong knowledge of Java, Experience building REST APIs, Experience with microservices architecture, Knowledge of relational or NoSQL databases, Experience with cloud platforms (GCP preferred), Experience with Docker and Kubernetes, Knowledge of design patterns, Experience with unit and integration testing, Experience working in Agile methodologies, Very good English skills 📃 Skills: Java, REST, Microservices, PostgreSQL, MySQL, MongoDB, GCP, Docker, Kubernetes, JUnit, Agile 🏢 Description: Dołącz do międzynarodowego zespołu technologicznego pracującego nad rozwojem nowoczesnych produktów cyfrowych, które mają realny wpływ na globalny biznes i procesy operacyjne. Szukamy doświadczonego Java Developera (Backend) który chce budować skalowalne systemy i mieć wpływ na architekturę oraz standardy technologiczne. Stanowisko: Java Developer (Mid+/Senior). Lokalizacja biura: Warszawa. 🛠 Stack technologiczny: Java, Microservices, REST API, Docker, Kubernetes, GCP, PostgreSQL, MySQL, MongoDB. Osoba na tym stanowisku będzie odpowiedzialna za projektowanie, rozwój i utrzymanie wydajnych oraz skalowalnych systemów backendowych. Będzie współpracować z zespołami produktowymi i technologicznymi w środowisku międzynarodowym oraz mieć realny wpływ na kierunek rozwoju rozwiązań. Zadania: Projektowanie i rozwój backendu oraz API (REST) Tworzenie skalowalnych mikroserwisów Dbanie o jakość kodu (code review, testy, dobre praktyki) Współpraca z frontendem, Product Ownerem i innymi interesariuszami Rozwiązywanie problemów produkcyjnych i optymalizacja systemów Wdrażanie i promowanie dobrych praktyk inżynierskich Mentoring mniej doświadczonych developerów Udział w decyzjach architektonicznych Wymagania: Ponad 6 lat doświadczenia jako Java Developer Bardzo dobra znajomość Java Doświadczenie w budowie REST API i mikroserwisów Znajomość baz danych (np. PostgreSQL, MySQL, MongoDB) Doświadczenie z chmurą (preferowana GCP ) Znajomość Dockera i Kubernetes Znajomość wzorców projektowych i dobrych praktyk Doświadczenie w testowaniu (unit/integration) Praca w metodykach Agile Bardzo dobra znajomość języka angielskiego Mile widziane: Znajomość: .NET / Python / Node.js Firma oferuje: Udział w projektach o globalnym zasięgu i realnym wpływie na biznes Pracę w doświadczonym, międzynarodowym zespole Możliwość wpływu na architekturę i standardy technologiczne Hybrydowy model pracy (2 dni w tygodniu praca z biura) Stabilne zatrudnienie i atrakcyjny pakiet benefitów Możliwość rozwoju technicznego i mentoringowego

🏢 Summary: Backend Software Engineer focused on digital transformation, responsible for modernizing legacy monolithic systems into cloud-native microservices architectures. The role involves building event-driven solutions, high-performance REST APIs, and managing containerized workloads on AWS/GCP with strong emphasis on code quality and end-to-end ownership. Predominantly remote position contributing to a large-scale digital agenda in a fast-paced environment. 🗂️ Requirements: 5+ years professional software development experience, Proven experience with distributed systems, Strong proficiency in Java, Strong proficiency in Spring Boot and Spring Data, Experience with Docker and Kubernetes, Experience with AWS or GCP, Experience implementing event-driven architectures with Apache Kafka, Experience designing and developing RESTful APIs using OpenAPI/Swagger, Fluent English, Fluent Spanish 📃 Skills: Java, Spring, SpringBoot, SpringData, Docker, Kubernetes, AWS, GCP, Kafka, REST, OpenAPI, Swagger, CI/CD, Microservices 🏢 Description: We are seeking a highly skilled Backend Software Engineer with a focus on Digital Transformation . The ideal candidate will have extensive experience in modernizing legacy systems and a strong background in developing microservices architectures. Proven expertise in API development, cloud platforms, and containerized environments is crucial for this role. The individual will play a key role in driving innovative solutions while upholding the highest standards of code quality and delivery. Key Responsibilities Modernization: Drive the transition from legacy monolithic architectures to modular, microservice-based systems. Event-Driven Architecture: Design and implement robust streaming pipelines and messaging solutions (Apache Kafka) to handle high-volume, real-time data. API-First Engineering: Develop and maintain high-performance RESTful APIs, adhering to OpenAPI/Swagger standards. Cloud-Native Delivery: Manage containerized workloads on cloud platforms (AWS/GCP) using Kubernetes, with a focus on CI/CD automation. Code Quality: Uphold engineering excellence through comprehensive unit/integration testing, pair programming, and rigorous architectural design reviews. Ownership: Take end-to-end responsibility for features from initial design to production deployment and observability. Key Requirements 5+ years in professional software development with a proven track record in distributed systems. Deep proficiency in Java and the Spring ecosystem (Spring Boot, Spring Data). Solid experience with containerization (Docker, Kubernetes) and cloud platforms (AWS, GCP). Proven ability to implement event-driven solutions using tools like Apache Kafka. Analytical problem-solver, comfortable navigating ambiguity, and passionate about continuous improvement/Clean Code. Fluent in English and Spanish, with the ability to bridge technical and business requirements. Nice to Have Experience with DevOps practices and CI/CD tools. Familiarity with Agile methodologies. Understanding of cloud security best practices. Other Details This position is focused on contributing to a transformative digital agenda, predominantly remote, with opportunities for collaboration across various teams. Ideal candidates will exhibit flexibility and readiness to adapt to new challenges in a fast-paced environment.