Backend Developer – Infrastructure

🏢 Summary: Backend Developer role focused on building and maintaining high-availability, high-traffic Java applications within a microservices architecture handling over 1 billion messages daily. The position involves developing new features, optimizing performance, ensuring data security, and working with reactive technologies, cloud services, and NoSQL databases. The role requires close collaboration with product and architecture teams on mission-critical systems. 🗂️ Requirements: Minimum 7 years experience as Backend Developer, Minimum 3 years commercial experience with Java, Advanced knowledge of Java frameworks and libraries, Experience with asynchronous or reactive Java frameworks, Advanced knowledge of unit testing and mocking frameworks, Experience with cloud technologies, Experience with large-scale NoSQL databases, Experience with microservices architecture, Experience with Docker, Experience with Kubernetes, Experience working in Agile methodology, Higher technical education, Fluent English (written and spoken) 📃 Skills: Java, Vertx, RxJava, Akka, NoSQL, Couchbase, MongoDB, Docker, Kubernetes, Cloud, Microservices, JUnit, Mockito, Agile 🏢 Description: Rakuten Viber is one of the most popular and downloaded apps in the world. Working with us provides a unique opportunity to influence hundreds of millions of our users and to be part of the journey that makes us a super-app. Our mission is to make people’s lives easier by enabling meaningful connections, from precious moments with family and friends, through managing business relationships to pursuing their passions. We are a global team of engineers dedicated to creating the best tools to ensure safe, convenient, and fun communication for millions of users worldwide. Our culture is built on innovation, teamwork, and a commitment to excellence. We offer a unique opportunity to work with cutting-edge technologies, including microservices architecture, and influence the lives of millions of people. As a Backend Developer at Viber, you will be involved in developing and maintaining high-traffic with over 1 billion messages a day and dozens of scalable services, ensuring the fast and reliable operation of our platform. Your tasks will include developing new features, optimizing performance, ensuring data security, and solving complex technical challenges within our microservices architecture, using a combination of Java, along with non-blocking and reactive approaches, Cloud services, and NoSQL databases. Responsibilities Planning, designing, developing and maintaining Java high-availability applications that can be high-volume and low-latency. Define application objectives and functionality. Ensure application designs conform with business goals. Support continuous improvement, investigating alternatives and technologies, and presenting for architectural review. Work in a highly motivated team, closely with Product and Architects teams on large mission-critical systems. Requirements At least 7 years of experience as a Backend Developer, with at least 3 years in Java. Advanced knowledge of Java, from frameworks to libraries. Experience in Async and/or reactive Java frameworks (such as Vertx, Rxjava, Akka). Advanced knowledge of unit testing frameworks and mocking. Knowledge of cloud technologies. Experience with large scale NoSQL database (such as Couchbase, MongoDB). Experience with microservices development based on Docker and Kubernetes. Experience with Agile methodology. Striving for new knowledge and skill improvement. Fluent in written and spoken English (interviews are in English). Excellent oral and written communication skills. Higher technical education. Experience leveraging AI tools to enhance productivity or decision-making is a strong advantage. Advantages Knowledge of C++. Experience working with Open Search / Elastic search. Experience with other server-side languages such as Node.js, Go, Python. Experience working with remote teams.

🏢 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: Offer for an experienced C++/Qt Developer to build and enhance a cross-platform desktop communication application for Windows, macOS, and Linux. The role focuses on developing new features, optimizing performance, and maintaining high-quality architecture across the full application stack. It involves deep work with UI, networking, and database layers in a large-scale production environment. 🗂️ Requirements: Minimum 5 years of professional C++/Qt development experience, Expert-level proficiency in Qt framework, including Qt Quick and QML, Strong expertise in modern C++ standards (C++17/20), Experience with CMake build system, Experience with Python and JavaScript, Proven cross-platform development for Windows, macOS, Linux, Extensive experience with SQLite or relational databases, Strong knowledge of client-server architecture and network programming, Experience with multithreading and concurrency control, Strong memory management skills, Experience with performance profiling and optimization tools 📃 Skills: C++, Qt, QML, QtQuick, CMake, Python, JavaScript, SQLite, Windows, macOS, Linux, Multithreading, Concurrency, Networking, Profiling 🏢 Description: Rakuten Viber is one of the most popular and downloaded apps in the world. Working with us provides a unique opportunity to influence hundreds of millions of our users and to be part of the journey that makes us a super-app. Our mission is to make people’s lives easier by enabling meaningful connections, from precious moments with family and friends, through managing business relationships to pursuing their passions. We are building and enhancing Viber for Desktop, the vital cross-platform extension of the Viber ecosystem. Our application empowers users across Windows, macOS, and Linux to enjoy seamless, high-quality free voice and video calls, exchange instant and group messages, and securely transmit multimedia content directly from their desktop environments. We are seeking an experienced, highly motivated, and self-directed C++/Qt Developer with a strong technical background and a proactive, entrepreneurial approach to join our engineering team. Responsibilities Feature Development: Drive the end-to-end development of new features and communication capabilities within the cross-platform Viber for Desktop application, utilizing C++ and the Qt framework (QML/Qt Quick). Optimization & Debugging: Perform deep-level diagnosis, debugging, and performance optimization across the entire application stack, from the UI (Qt Quick/QML) down to network layers and database interactions (SQLite). Code Quality & Architecture: Actively participate in architecture discussions and contribute to the ongoing refinement, refactoring, and standardization of the C++ codebase to maintain high quality and minimize technical debt. Collaboration & Deployment: Collaborate closely with product, design, and QA teams to ensure seamless integration and deployment of new functionalities across Windows, macOS, and Linux platforms. Requirements Experience: Minimum of 5 years of professional experience in C++/Qt development. Qt Framework: Expert-level proficiency with the Qt framework, including Qt Quick and QML. C++ Standards: Demonstrated expertise in modern C++ standards (C++17/20). Tooling & Scripting: Solid experience with the CMake build system, Python, and JavaScript (JS). Cross-Platform: Proven track record in developing and maintaining cross-platform applications targeting Windows, macOS, and Linux operating systems. Database: Extensive experience working with relational databases, specifically SQLite. Networking: Deep understanding and practical experience with client-server architecture and network programming concepts. Concurrency & Memory: Comprehensive knowledge of multi-threading, concurrency control, and robust memory management techniques. Performance: Proficiency in utilizing performance profiling and optimization tools.

🏢 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: 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: Role focused on designing and developing new features for a large-scale iOS application, ensuring high performance, code quality, and reliability. The position involves optimizing, refactoring, and maintaining the iOS client while delivering high-quality user experiences. 🗂️ Requirements: 5+ years of production mobile software development experience, Proficiency in Objective-C, Proficiency in Swift, Strong experience in iOS development, Strong knowledge of Object-Oriented Programming, Strong knowledge of algorithms, Strong knowledge of design patterns, Experience with multithreading, Experience with unit testing 📃 Skills: Objective-C, Swift, iOS, OOP, Algorithms, Design-patterns, Multithreading, Unit-testing, Mobile 🏢 Description: Rakuten Viber is one of the most popular and downloaded apps in the world. Working with us provides a unique opportunity to influence hundreds of millions of our users and to be part of the journey that makes us a super-app. Our mission is to make people’s lives easier by enabling meaningful connections, from precious moments with family and friends, through managing business relationships to pursuing their passions. As an iOS Developer, you will be responsible for design and development of Viber iOS client. We offer many interesting and challenging tasks that will allow you to extend your technical abilities delivering the product of the highest quality to our users. The ideal candidate is interested in improving our users’ experience and wants to make a positive impact on the team. Responsibilities Development of new features of Viber app. Improve code quality through writing unit tests and performing code reviews. Improve quality of application and bug fixing. Applications optimization and Code refactoring. Requirements At least 5 years of production mobile software development experience. Proficient in Objective-C/ Swift and iOS development. Experience collaborating with multiple cross-functional teams including support, product management, developers. Expert in Object-Oriented programming, algorithms, design patterns, multi-threading. Experience in Unit Testing. Strong communication skills. Intermediate spoken level of English. Availability to work full-time job in a hybrid mode (3 times a week at the office). Experience leveraging AI tools to enhance productivity or decision-making is a strong advantage.

🏢 Summary: Senior Backend Engineer role focused on designing and developing scalable, reliable backend services using Java. The position involves working in a cross-functional team to build high-performance systems, improve architecture, and support CI/CD and production environments. 🗂️ Requirements: 5+ years Backend Engineering experience, Strong Java proficiency, Solid knowledge of databases and SQL, Experience with RESTful APIs, Experience with microservices architecture, Experience with high-load systems, Experience with Docker and Kubernetes, Experience with AWS or GCP, Knowledge of CI/CD pipelines, Understanding of Agile practices 📃 Skills: Java, SQL, REST, Microservices, Docker, Kubernetes, AWS, GCP, CI/CD, Golang, Python 🏢 Description: We are looking for a Senior Backend Engineer with strong Java experience to help us design and develop scalable solutions. You will work in a cross-functional team, building reliable services and contributing to the continuous improvement of our systems. This role is ideal for someone who enjoys solving complex problems and driving technical excellence. 💼 Responsibilities: Design, develop, and maintain backend features and services. Collaborate with teams to define requirements and integrate systems. Ensure performance, scalability, and reliability of applications. Contribute to CI/CD processes and support production systems. Write clear documentation and share knowledge within the team. ✅ Requirements: 5+ years of experience as a Backend Engineer, with strong Java skills (Golang/Python is a plus). Solid understanding of databases and SQL. Experience with RESTful API design, microservices, and high-load systems. Familiarity with Docker, Kubernetes, and cloud environments (AWS/GCP). Knowledge of CI/CD pipelines and Agile practices. Strong problem-solving and communication skills. 🎁 We offer: Stable employment in a fast-growing company. Flexible and remote-friendly working model. Health and wellbeing benefits. Learning and development opportunities. Modern equipment and comfortable work environment.

🏢 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: Software Engineer role focused on building and scaling a multi-tenant customer engagement platform for enterprise contact centers. The position involves developing backend services, real-time communication components, and cloud-native infrastructure using Ruby on Rails, Node.js, and Kubernetes on Azure. You will work on distributed systems, integrations, and CI/CD pipelines to ensure reliability, scalability, and security. 🗂️ Requirements: Strong experience with Ruby on Rails 7.x and Ruby 3.x, Experience with Node.js and Express.js, Hands-on experience with PostgreSQL schema design and query optimization, Experience designing and maintaining REST APIs, Experience with authentication and authorization mechanisms (JWT, OAuth2, OIDC, policy patterns), Experience with background job systems, Experience with Redis (caching, pub/sub), Experience with Docker and writing Dockerfiles, Understanding of Kubernetes and Helm, Experience with CI/CD pipelines, Experience integrating third-party REST/webhook APIs 📃 Skills: Ruby, Rails, PostgreSQL, Redis, Node.js, Express, WebSockets, Docker, Kubernetes, Azure, AKS, Helm, GitLab, CI/CD, RSpec, Jest, JWT, OAuth2, OIDC, Pundit, Devise, DelayedJob, ActiveJob, Sidekiq, JSON:API, Graphiti, Prometheus, NewRelic, SonarCloud, Aikido, Genesys, Vonage, WebRTC, SIP, Terraform, Cloudflare, React 🏢 Description: About Us VC-backed, 15-person team across Poland, Mexico & the Philippines - with global expansion underway. We’re defining a new category: a customer contact & collaboration layer on top of enterprise contact center and CRM platforms - already trusted by global enterprises across Europe, Asia, and the Americas. Our platform is used by enterprise clients across multiple industries, with a strong focus on reliability, scalability, security, and seamless real-time communication experiences. We combine modern cloud-native architecture with deep expertise in WebRTC, contact center integrations, and customer engagement technologies. As a rapidly growing company, we maintain a strong engineering culture built around ownership, collaboration, continuous improvement, and pragmatic problem-solving. We value people who are curious, proactive, and excited about building meaningful products in a fast-moving environment. About the Role We’re looking for a Software Engineer with strong technical skills and hands-on experience building modern distributed systems and web applications. In this role, you’ll help design, develop, maintain, and improve a multi-tenant customer engagement platform used primarily by enterprise contact centers. You’ll work across backend services, infrastructure, and internal tooling to ensure our systems remain scalable, reliable, secure, and easy to evolve. Our platform combines multiple technologies and real-time communication channels, including voice, video, chat, callbacks and many more, integrated with providers such as Genesys Cloud and Vonage. The backend architecture includes: A Ruby on Rails API responsible for core business logic, authentication, integrations, and account management Several Node.js services handling real-time signaling, visitor data processing, and analytics Cloud-native infrastructure running on Kubernetes and Azure services You’ll work closely within a small, highly collaborative engineering team where ownership and initiative are highly valued. We’re looking for someone who enjoys solving complex technical challenges, moving quickly, contributing ideas, and building high-quality software that delivers real value to customers. Responsibilities Develop and maintain the core REST/JSON:API backend in Ruby on Rails 7 (PostgreSQL, Redis, Puma, Delayed Job) + upgrade to RoR 8 Own the Node.js signalling server built on Express + WebSockets Extend and debug integrations with Genesys Cloud and Vonage Write and maintain authorization policies and multi-tenant access control logic Design and run database migrations on a mature PostgreSQL schema (200+ migrations) Work within a Kubernetes on Azure AKS environment - understand Helm charts, environment configs, and deployment pipelines Participate in GitLab CI/CD - security checks (SonarCloud, Aikido.dev), Docker builds, staged deploys Gradually improve test coverage using RSpec (Rails) and Jest (Node.js) Required Skills Ruby on Rails Rails 7.x, Ruby 3.x (-> 8.x, 4.x) PostgreSQL - schema design, migrations, query optimization REST API design; experience with JSON:API / Graphiti is a plus Background jobs: Delayed Job, ActiveJob, or Sidekiq Authentication: Devise, JWT, OAuth2, OIDC Authorization: Pundit or similar policy pattern Node.js Node.js 24+, Express.js WebSockets Redis (caching, pub/sub, locking patterns) Azure Storage (Tables, Queues) or equivalent cloud storage SDKs Comfort with async code General Backend Designing and consuming third-party REST/webhook APIs Docker - writing and maintaining Dockerfiles Kubernetes basics - reading Helm charts, understanding namespaces and config maps Git + CI/CD pipelines Structured logging and APM tools (New Relic, Prometheus) Nice to Have Experience with Genesys Cloud or other contact center solution Experience with Vonage or other CPaaS telephony (SIP, WebRTC) Terraform / Azure infrastructure Cloudflare Workers React (the frontend teams will occasionally need backend pairing) Compensation 19-24k B2B Meaningful ESOP upside (VC-backed) 26 days of paid holiday

🏢 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.