Java Fullstack Developer (Java/React)

🏢 Summary: The offer is for a Senior Fullstack Developer responsible for designing, developing, and optimizing scalable web applications with a strong focus on Java-based back-end systems and React/Next.js front-end solutions. The role involves building and maintaining APIs, integrating third-party services, managing databases, and ensuring application security and performance. It includes collaboration with cross-functional teams and contributing to high-quality, secure, and well-documented systems. 🗂️ Requirements: At least 4 years of experience in similar position, Proficiency in Java server-side programming, Strong understanding of React and Next.js core principles, Experience with React Router, Hooks, Redux or similar state management, Experience with MySQL, PostgreSQL or MongoDB, Proven experience in building scalable web applications, Experience in back-end development, English level B2 or higher 📃 Skills: Java, React, Next.js, Redux, JavaScript, MySQL, PostgreSQL, MongoDB, Git, REST, API, Docker, NodeJS, AWS, Azure, GCP 🏢 Description: Tasks: Designing, developing, and maintaining the server-side logic of web applications. Implementing scalable and efficient server-side components and APIs. Build React/Next.js based applications. Working with relational and/or NoSQL databases to store and retrieve data efficiently. Designing and optimizing database schemas for performance and scalability. Integrating third-party APIs and web services to enhance application functionality. Developing custom APIs to facilitate communication between front-end and back-end systems. Implementing security best practices to protect against common web application vulnerabilities. Conducting regular security audits and implement necessary measures. Optimization: optimizing server-side code for maximum speed and scalability. Monitoring and troubleshooting performance issues. Collaborating with front-end developers, UI/UX designers, and other team members to ensure seamless integration of components. Using version control systems (e.g., Git) to manage and track changes to the codebase. Conducting thorough testing of server-side components to identify and fix bugs. Collaborating with QA engineers for comprehensive testing. Clear and comprehensive documentation for back-end systems and APIs. Requirements: At least 4 years of experience in a similar position. Proficiency in Java server-side programming. Thorough understanding of React/Next.js core principles along with React router, hooks, Redux (or the like) workflows, Web performance and security. Experience with database systems (e.g., MySQL, PostgreSQL, MongoDB). Proven experience in back-end development and building scalable web applications. Familiarity with cloud platforms (e.g., AWS, Azure, GCP) is a plus. Previous experience in Front-end development with Docker is plus. Experience with NodeJS is a plus. Strong analytical and problem-solving skills with attention to detail. Effective communication skills to collaborate with cross-functional teams. Ability to adapt to changing project requirements and technologies. English at least B2. Offer: Stable employment. On the market since 2008, 1500+ talents currently on board in 7 global sites. “Office as an option” model. You can choose to work remotely or in the office. Great Place to Work® certified employer. Flexibility regarding working hours and your preferred form of contract. Comprehensive online onboarding program with a “Buddy” from day 1. Cooperation with top-tier engineers and experts. Unlimited access to the Udemy learning platform from day 1. Internal Gallup Certified Strengths Coach to support your growth. Certificate training programs. Lingarians earn 500+ technology certificates yearly. Upskilling support. Capability development programs, Competency Centers, knowledge sharing sessions, community webinars, 110+ training opportunities yearly. Grow as we grow as a company. 76% of our managers are internal promotions. A diverse, inclusive, and values-driven community. Autonomy to choose the way you work. We trust your ideas. Create our community together. Refer your friends to receive bonuses. Activities to support your well-being and health. Plenty of opportunities to donate to charities and support the environment. Modern office equipment. Purchased for you or available to borrow, depending on your location.

🏢 Summary: Frontend Developer role focused on building and maintaining modern web applications using React.js. The position involves creating responsive, user-centered interfaces, integrating RESTful APIs, and delivering scalable, maintainable frontend solutions. Emphasis is placed on performance, accessibility, and clean code standards. 🗂️ Requirements: 3–4+ years commercial frontend development experience, Strong hands-on experience with React.js, Proficiency in modern JavaScript (ES6+), Solid knowledge of HTML5 and CSS3, Experience with responsive design principles, Experience integrating RESTful APIs, Understanding of UI/UX best practices, Familiarity with state management, Experience with component-based architecture, Experience with Git and collaborative workflows, Ability to write scalable and maintainable code, Strong debugging and problem-solving skills 📃 Skills: React, JavaScript, ES6, HTML5, CSS3, REST, API, Git, UI, UX 🏢 Description: Responsibilities Develop and maintain modern web applications using React.js . Create responsive and intuitive user interfaces with a strong focus on usability and user experience. Connect frontend applications with RESTful APIs and backend systems. Translate business and design requirements into scalable frontend solutions. Write clean, reusable, and maintainable code following frontend development standards. Collaborate closely with designers, product owners, and backend engineers. Optimize application performance, accessibility, and cross-browser compatibility. Requirements 3–4+ years of commercial experience in frontend development. Strong hands-on experience with React.js and modern JavaScript (ES6+). Solid knowledge of HTML5, CSS3, and responsive design principles. Experience integrating APIs and working with backend services. Understanding of UI/UX best practices and user-centered design. Familiarity with state management and component-based architecture. Experience with Git and collaborative development workflows. Ability to write efficient, scalable, and well-structured frontend code. Strong problem-solving and debugging skills.

🏢 Summary: The offer is for a Full Stack .NET Developer responsible for building scalable backend services and RESTful APIs within domain-driven and event-driven architectures, as well as developing responsive frontend interfaces. The role involves working with microservices or modular monoliths, implementing asynchronous integrations, and ensuring high code quality through testing and CI/CD practices. The position requires close collaboration in an agile environment and contribution to architectural decisions. 🗂️ Requirements: Minimum 3 years of experience in similar role, Very good knowledge of ASP.NET WebAPI (.NET Core), Very good knowledge of React, Very good knowledge of TypeScript, Experience with Unit Testing, Very good knowledge of Git, Very good knowledge of SQL Server or Azure SQL, Experience with EF Core, Experience with CI/CD pipelines, Experience with containerised deployments, Experience with event-driven architecture, Good command of English 📃 Skills: C#, .NET, ASP.NET, WebAPI, React, TypeScript, SQL, SQLServer, AzureSQL, EFCore, Git, CI/CD, Docker, Microservices, REST, UnitTesting 🏢 Description: Responsibilities: Designing and implementing scalable backend services and RESTful APIs within a domain-driven and event-driven architecture context, including both modular monolith and microservices approaches Building and maintaining responsive frontend interfaces, ensuring seamless integration with backend systems Contributing to architectural decisions and participating in collaborative design sessions to align technical solutions with business requirements Writing and maintaining unit, integration, and end-to-end tests. Ensuring code quality through thorough code reviews and adherence to team standards Working with CI/CD pipelines, containerised deployments, and infrastructure as code Implementing asynchronous communication patterns and event-based integrations between services Configuring and utilising monitoring and observability tools for application diagnostics and performance analysis Collaborating within an agile team, working closely with business analysts to refine requirements, and actively participating in sprint ceremonies Requirements: At least 3 years of experience on a similar position Very good knowledge of ASP.NET WebAPI (.NET Core) Very good knowledge of React, TypeScript Very good knowledge or experience in Unit Testing and GIT Very good knowledge of SQL Server/Azure SQL, EF Core Good command of English Offer: Constant support of dedicated consultant Employee referral program

🏢 Summary: Full-stack development role focused on building and maintaining backend services in Node.js and frontend applications in React.js with Next.js. The position involves designing cloud-based solutions on AWS, integrating CDN services, and managing deployments on Heroku. 🗂️ Requirements: Strong hands-on experience with Node.js, Solid experience with React.js, Practical experience with Next.js, Experience with AWS, Experience with CDN solutions, Experience with Heroku, Very good English proficiency 📃 Skills: Node.js, React.js, Next.js, AWS, CDN, Heroku, JavaScript 🏢 Description: Responsibilities: Develop and maintain backend solutions using Node.js Build and develop frontend components using React.js Work with Next.js for server‑side rendering and frontend architecture Design and integrate solutions deployed on cloud platforms, primarily AWS Work with CDN solutions to support application delivery and performance Support application deployment and hosting on Heroku Collaborate within the development team to deliver end‑to‑end functionality Requirements: Strong hands‑on experience with Node.js Solid frontend development experience with React.js Practical experience with Next.js Experience working with Amazon Web Services (AWS) Experience using CDN solutions Experience with Heroku as an application hosting platform Very good command of English, both spoken and written Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 Summary: Backend Java Developer role focused on building scalable, high-performance server-side applications using Spring Boot. The position involves database design, API development (REST/SOAP), search optimization with ElasticSearch, and maintaining high code quality within CI/CD environments. The role requires strong experience in the Java ecosystem and collaboration with cross-functional teams. 🗂️ Requirements: Minimum 4 years of backend development experience with Java, Strong hands-on experience with Spring Boot, Practical experience with Hibernate ORM, Experience with MS SQL databases, Experience with ElasticSearch or similar search engines, Proficiency in REST and SOAP API development, Experience working with JSON and XML, Basic knowledge of HTML, CSS, JavaScript, Experience with Git version control, Understanding of CI/CD pipelines and tools like Jenkins or TeamCity, Experience with Docker 📃 Skills: Java, Spring, SpringBoot, Hibernate, MSSQL, ElasticSearch, REST, SOAP, JSON, XML, HTML, CSS, JavaScript, Git, Jenkins, TeamCity, Docker 🏢 Description: Key Responsibilities Core Backend Development: Designing and developing robust, scalable, and high-performance server-side applications using Java and the Spring Boot framework. Database Management: Designing efficient database schemas, writing optimized queries, and managing data persistence using Hibernate and MS SQL. API Design & Integration: Building, integrating, and maintaining secure RESTful and SOAP web services (WebApi, WCF) to ensure seamless communication between systems. Search Optimization: Implementing and tuning efficient search and indexing solutions utilizing ElasticSearch. Code Quality & Mentorship: Writing clean, maintainable, and well-tested code while participating in code reviews to ensure alignment with industry best practices. Requirements Experience: Minimum 4 years of professional experience in backend development with a strong focus on the Java ecosystem. Frameworks & ORM: Deep understanding and hands-on experience with Spring Boot and Hibernate. Databases & Search: Practical knowledge of MS SQL and experience with ElasticSearch or similar search engines. Web Services & Formats: Proficiency in developing APIs (REST/SOAP) and working comfortably with JSON and XML data formats. Front-End Basics: General understanding of web technologies (HTML, CSS, JavaScript) to effectively collaborate with front-end teams. Tools & Version Control: Strong command of Git and a solid understanding of CI/CD workflows (e.g., Jenkins/TeamCity, Docker).

🏢 Summary: Backend engineering role focused on building scalable backend services, APIs, and internal developer platforms in a fully remote environment. The position involves improving system architecture, optimizing distributed systems, and collaborating across the full software development lifecycle. The offer includes influence on technical decisions, modern technologies, and growth opportunities within an experienced engineering team. 🗂️ Requirements: 5+ years of backend software development experience, Proficiency in PHP or experience with Java, Python, Go, Knowledge of RESTful APIs and GraphQL, Experience building scalable distributed backend systems, Experience with SQL/MySQL and database optimization, Experience with automated testing and monitoring, Knowledge of debugging production systems, Familiarity with contract-driven development, English for daily technical communication 📃 Skills: PHP, Java, Python, Go, REST, GraphQL, SQL, MySQL, React, API 🏢 Description: ✅ Your responsibilities: ・Design, develop, and maintain scalable backend services and APIs for third-party integrations. Improve platform architecture, service communication, and internal developer tooling. Collaborate with Product Managers, Designers, and Engineers throughout the entire software development lifecycle. Optimize existing systems for performance, scalability, reliability, and maintainability. Drive engineering best practices, including code quality, testing, and documentation. Participate in architecture discussions and technical decision-making. Mentor engineers through code reviews, pair programming, and knowledge sharing. Continuously improve the developer experience by building reliable internal platforms and tools. 🧠 Our requirements: 5+ years of experience in backend software development. Strong proficiency in PHP (preferred) or solid experience with Java, Python, Go , or similar backend technologies. Strong understanding of RESTful APIs , GraphQL , and API design best practices. Experience designing and building scalable, distributed backend systems. Hands-on experience with SQL/MySQL databases and database optimization. Experience with automated testing, observability, monitoring, and debugging production systems. Familiarity with contract-driven development and modern software development practices. Basic knowledge of frontend technologies such as React is a plus. Strong communication skills and the ability to collaborate across cross-functional teams. Passion for writing clean, maintainable, and high-quality code or AI automation English at a level allowing daily technical communication 🌟 What we offer: 100% remote work. Private healthcare and Multisport. Life insurance. Real influence on technical decisions and system architecture. Opportunity to build scalable backend services and developer platforms. Work with modern technologies in a collaborative engineering environment. Knowledge sharing, mentorship, and professional growth opportunities. Friendly, supportive, and experienced engineering team.

🏢 Summary: The role involves developing and maintaining scalable full-stack web applications using .NET and modern frontend frameworks. You will design robust Web APIs, optimize databases, and implement clean, testable code within CI/CD-driven environments. The position requires active participation in the full software development lifecycle for international projects. 🗂️ Requirements: Minimum 3 years commercial experience with .NET (C#, Web API, Entity Framework), Proficiency in Angular or React, Strong knowledge of JavaScript, HTML, CSS, Experience with SQL Server or PostgreSQL, Understanding of Unit Testing, Experience with Git, Experience with CI/CD pipelines, Knowledge of design patterns, Knowledge of software development best practices, Fluent English (min. B2), Availability for hybrid work mode 📃 Skills: .NET, C#, WebAPI, EntityFramework, Angular, React, JavaScript, HTML, CSS, SQL, SQLServer, PostgreSQL, UnitTesting, Git, CI/CD 🏢 Description: As a member of our development team, you will be responsible for building scalable web applications, designing robust APIs, and creating intuitive user interfaces. We value clean code, analytical thinking, and a proactive approach to technology. Our expectations: Minimum 3 years of commercial experience in .NET (C#, Web API, Entity Framework). Proficiency in Angular or React, along with JavaScript, HTML, CSS, and modern frontend libraries. Strong experience with relational databases such as SQL Server or PostgreSQL. Solid understanding of Unit Testing, Git, and CI/CD pipelines. Practical knowledge of design patterns and software development best practices. A collaborative mindset and the ability to explain complex technical issues clearly. Strong analytical skills and a "get it done" attitude. Fluent English (min. B2) for smooth collaboration with international partners. Open to work in hybrid mode. Main responsibilities: You will design, develop, and maintain scalable full-stack applications using .NET and modern frontend frameworks (Angular/React) for diverse client projects. You will be responsible for writing clean, testable code and implementing unit tests to ensure the highest software performance and reliability. You will work closely with cross-functional teams to architect robust Web APIs and optimize database schemas while following industry best practices and design patterns. You will actively participate in the full software development life cycle, including CI/CD processes and version control management, to ensure seamless project delivery.

🏢 Summary: Senior Frontend Developer role focused on designing, developing and maintaining web applications using React and TypeScript, with close integration to REST APIs. The position involves performance optimization, code quality assurance, and adherence to security and W3C standards. The role also includes managing build processes and collaborating on technical solution design. 🗂️ Requirements: Higher education in Computer Science or related field, Minimum 5 years of commercial experience in web application development, Very good knowledge of JavaScript (ES6/ES7), Very good knowledge of TypeScript, Very good knowledge of HTML5, Very good knowledge of CSS3, Experience with React (Redux, Saga), Experience with Node.js, Experience with NPM, Experience with Bootstrap, Experience with jQuery, Experience with Webpack, Experience with Gulp or Grunt, Experience with SASS or LESS, Knowledge of OOP design patterns, Knowledge of OWASP Top 10, Experience with REST API integration, Knowledge of W3C standards, Ability to optimize web application performance, Experience with Git, English proficiency for working with technical documentation 📃 Skills: JavaScript, TypeScript, HTML5, CSS3, React, Redux, Saga, Node.js, NPM, Bootstrap, jQuery, Webpack, Gulp, Grunt, SASS, LESS, OOP, OWASP, REST, W3C, Git, ES6, ES7 🏢 Description: Twój zakres obowiązków Projektowanie, rozwój i utrzymanie aplikacji webowych (frontend + integracje) Tworzenie nowych funkcjonalności w oparciu o React oraz TypeScript Współpraca z zespołem backendowym przy integracji REST API Dbanie o jakość kodu (code review, stosowanie dobrych praktyk i wzorców projektowych) Optymalizacja wydajności aplikacji oraz poprawa UX/UI Utrzymanie zgodności ze standardami W3C oraz zasadami bezpieczeństwa (OWASP Top 10) Udział w analizie wymagań i projektowaniu rozwiązań technicznych Zarządzanie zależnościami i procesem budowania aplikacji (Webpack, Gulp/Grunt) Praca z systemem kontroli wersji Git Nasze wymagania Wykształcenie wyższe (preferowane kierunki informatyczne lub pokrewne) Minimum 5 lat doświadczenia komercyjnego w tworzeniu aplikacji webowych Bardzo dobra znajomość: JavaScript (ES6/ES7), TypeScript, HTML5, CSS3 Doświadczenie w pracy z: React (Redux, Saga), Node.js, NPM, Bootstrap, jQuery, Webpack oraz, Gulp/Grunt, Preprocesorami CSS (SASS/LESS) Znajomość wzorców projektowych (OOP) Znajomość zagadnień bezpieczeństwa aplikacji (OWASP Top 10) Doświadczenie w pracy z REST API Znajomość standardów W3C Umiejętność optymalizacji wydajności aplikacji Znajomość systemu kontroli wersji Git Znajomość języka angielskiego na poziomie umożliwiającym pracę z dokumentacją techniczną Mile widziane Doświadczenie w pracy w metodykach Agile/Scrum Znajomość narzędzi do lintowania (TSlint/JSLint) i dbałość o jakość kodu Doświadczenie w pracy z dużymi aplikacjami frontendowymi (SPA) Umiejętność pisania testów jednostkowych i integracyjnych Znajomość CI/CD Doświadczenie w pracy z nowoczesnymi narzędziami developerskimi i automatyzacją buildów Zainteresowanie nowymi technologiami frontendowymi i trendami

🏢 Summary: Full-stack engineering role focused on building scalable web applications using Python (FastAPI) and React.js. The position involves designing databases, developing RESTful APIs, and deploying cloud-native solutions on AWS with containerization and CI/CD practices. The role also includes developing Generative AI applications using modern AI tools and APIs. 🗂️ Requirements: Proven experience with Python and FastAPI, Ability to work with React.js on frontend development, Hands-on experience with PostgreSQL, Redis, and PGVector, Experience managing infrastructure on AWS, Proficiency with Docker and Kubernetes, Experience implementing CI/CD pipelines and automated testing, Strong understanding of RESTful API design and backend services, Experience or strong interest in Generative AI development using LangChain or OpenAI APIs 📃 Skills: Python, FastAPI, React, PostgreSQL, Redis, PGVector, AWS, Docker, Kubernetes, SQL, NoSQL, REST, CICD, LangChain, OpenAI 🏢 Description: Key Responsibilities: Backend & Frontend Development: Develop scalable web applications using Python (FastAPI) and work across the stack with React.js. Database Management: Design and optimize SQL, NoSQL, and vector databases, specifically PostgreSQL, Redis, and PGVector. Cloud & Infrastructure: Work within the AWS cloud environment and utilize Docker and Kubernetes for containerization and orchestration. API Development: Collaborate on building robust RESTful APIs and modern backend services. AI & DevOps Practices: Apply CI/CD and automated testing workflows, while building Gen AI applications using tools like LangChain and OpenAI APIs. Requirements: Technical Stack: Proven experience with Python (FastAPI) and the ability to work effectively with React.js. Database & Cloud: Hands-on experience with PostgreSQL, Redis, PGVector, and managing infrastructure on AWS. DevOps Tools: Proficiency with Docker, Kubernetes, and implementing automated testing and CI/CD pipelines. API Architecture: Strong understanding of designing and integrating RESTful APIs and backend services. Gen AI Interest: Experience or a strong interest in developing Generative AI applications using LangChain, OpenAI APIs, or similar

🏢 Summary: Fullstack Engineer role focused on building and scaling a global data-driven insights platform using modern JavaScript technologies. The position involves developing backend and frontend services, designing scalable databases, and influencing system architecture. You will work on high-load systems, ensure code quality, and contribute to technical decisions and mentoring. 🗂️ Requirements: 5+ years of experience with JavaScript and Node.js, 3+ years of experience with TypeScript and React or Next.js, Hands-on experience with scalable backend systems, Experience designing SQL and NoSQL database schemas, Ability to optimize queries for high-load systems, Knowledge of web fundamentals and networking concepts, Understanding of OWASP security best practices, Experience with AWS cloud services, Experience writing unit, integration, and e2e tests, Professional proficiency in English 📃 Skills: JavaScript, Node.js, TypeScript, React, Next.js, REST, GraphQL, SQL, NoSQL, AWS, CORS, OWASP, Microservices, Serverless 🏢 Description: We’re building a data-driven insights platform used by professionals worldwide. Our mission is to turn complex data into actionable insights and empower teams to make better decisions. We value ownership, technical excellence, and collaboration . If you enjoy building scalable systems, mentoring engineers, and shaping software architecture, you’ll fit right in. 🎯 Your mission Develop and maintain backend and frontend services (REST/GraphQL APIs, React apps) Design scalable database schemas (SQL & NoSQL) and optimize queries for high-load systems Collaborate with product, design, and DevOps teams to deliver robust solutions Write clean, tested code (unit, integration, e2e) Influence architecture and technical decisions Mentor other developers and share best practices 📌 You should have 5+ years in JavaScript / Node.js 3+ years in TypeScript + React/Next.js Hands-on experience with scalable backend systems Knowledge of web fundamentals & networking (CORS, browser behavior) Understanding of security best practices (OWASP) Experience with cloud services (AWS preferred) Strong communication skills in English Ability to work independently and take ownership ✨ Nice to have Experience with microservices / serverless architectures Data pipelines, scraping, or data-heavy applications Team leadership or mentoring experience Exposure to AI/ML integrations 💡 Why join us High-impact role on a global data platform Work with modern technologies and best engineering practices Autonomy & ownership in your work Collaborative and experienced team Competitive employment package and benefits.