Full-Stack Developer (React + Java), Officer

🏢 Summary: Full Stack Developer role focused on building scalable, cloud-native applications using React and C# .NET Core in a capital markets environment. The position involves developing microservices, REST APIs, data pipelines, and analytical solutions supporting credit and market risk domains. 100% remote B2B contract with flexible start date. 🗂️ Requirements: 4-5+ years of full stack development experience, Strong expertise in React, Strong expertise in C#, Experience with .NET Core, Experience with microservices architecture, Experience with event-driven architecture, Experience with distributed systems, Experience building REST APIs, Hands-on experience with Python, Experience with PySpark, Experience with Power BI, Experience with data modeling, Experience in credit risk and market risk domains 📃 Skills: React, C#, .NETCore, Microservices, REST, TypeScript, Python, PySpark, PowerBI, DataModeling, DistributedSystems, EventDriven, Cloud 🏢 Description: Start Date: ASAP / Within 1 Month / Flexible Work Model: 100% remote Contract Type: B2B (140-160 PLN/h + VAT) We are looking for a highly skilled Full Stack Developer with deep expertise in React for frontend development and C# .NET Core for backend services. This role requires hands‑on experience building scalable, cloud‑native systems, along with strong exposure to capital markets, especially within credit risk and market risk domains. Expectations Minimum 4-5 years of professional software development experience across frontend and backend technologies. Strong expertise in React, C# .NET Core , microservices, event‑driven architecture, and distributed systems. Hands‑on experience with Python (pyspark), Power BI dashboards, data modeling, and analytical reporting. Responsibilities Develop and maintain full stack applications using React, C# .NET Core, and modern cloud‑native technologies. Build scalable backend services, REST APIs, and microservices with a focus on performance and resilience. Implement modular, accessible, and high‑quality frontend components using React and TypeScript. Collaborate with business and risk experts to deliver solutions in credit risk, market risk, and capital markets workflows. Work with Python (pyspark) to build data pipelines, transformations, and analytics processes. What We Offer Medicover healthcare package Multisport card Access to an e-learning platform Group life insurance

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

🏢 Summary: Senior Full Stack Developer role focused on building scalable, cloud-native applications using React and C# .NET Core within capital markets risk domains. The position involves developing microservices, REST APIs, data pipelines with Python (pyspark), and enterprise Power BI solutions. Strong emphasis on event-driven architectures, CI/CD automation, and Azure-based cloud environments. 🗂️ Requirements: 10+ years software development experience, Strong proficiency in React.js and JavaScript/TypeScript, Expertise in C# and .NET Core, Experience building REST APIs and microservices, Hands-on experience with Python and pyspark, Extensive Power BI development experience, Strong knowledge of microservices and event-driven architectures, Experience with CI/CD pipelines, Experience with Azure or AWS, Proficiency in SQL databases, Experience with Docker and Kubernetes, Understanding of credit risk and market risk domains 📃 Skills: React, JavaScript, TypeScript, Redux, C#, .NET, Python, pyspark, PowerBI, DAX, SQL, SQLServer, PostgreSQL, Docker, Kubernetes, Azure, AWS, Kafka, EventHub, Jenkins, GitHub, AzureDevOps, REST, Microservices 🏢 Description: About the Role We are seeking a highly experienced Senior Full Stack Developer with deep expertise in React on the frontend and C# .NET Core on the backend. The ideal candidate will have substantial hands-on experience developing scalable applications, strong exposure to cloud-native architectures, and a solid understanding of capital markets—particularly in credit risk and market risk domains. Experience with Python (pyspark) for data-driven workflows and a strong command of CI/CD, microservices, and event-driven architectures is essential. ________________________________________ Key Responsibilities Design, develop, and maintain full stack applications using React, C#.NET Core, and supporting technologies. Build high-performance backend services, RESTful APIs, and microservices with focus on scalability, maintainability, and resilience. Develop responsive, modular, and accessible UI components using React and modern JS/TS patterns. Collaborate closely with business stakeholders and risk domain experts to deliver solutions in credit risk, market risk, and related capital markets functions. Work with Python (pyspark) for data transformation, data pipelines, and analytics workflows. Develop, optimize, and maintain Power BI dashboards, data models, and analytical reports for business users. Implement and optimize CI/CD pipelines, ensuring robust automated testing, deployment, and monitoring. Architect and contribute to event-driven and distributed system designs using technologies such as Kafka, Event Hub, or similar. Drive engineering best practices: code reviews, unit/integration testing, performance tuning, documentation. Contribute to cloud migration and modernization initiatives, especially in Azure or AWS environments. Mentor junior developers and collaborate within a cross-functional agile team. ________________________________________ Required Skills & Experience Technical Skills 10+ years of professional software development experience. Front-end: Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK, hooks, and modern UI patterns. Back-end: Expertise in C# .NET Core, C#, REST APIs, Web APIs, and microservices-based development. Python (pyspark): Hands-on experience with distributed data processing, data pipelines, and analytic transformations. Power BI: Extensive experience developing dashboards, data models, DAX calculations, and enterprise-grade BI solutions. Strong understanding of data modeling, performance tuning, and governance in Power BI. Architecture: Strong knowledge of microservices, API design, event-driven architectures, and distributed systems. DevOps / CI/CD: Experience with Azure DevOps, GitHub Actions, Jenkins, or similar. Strong understanding of automated builds, testing, deployment, and monitoring. Cloud Platforms: Experience with Azure or AWS (Azure preferred). Databases: Proficiency with SQL Server, PostgreSQL, or other relational databases; NoSQL knowledge a plus. Containerization: Experience with Docker, Kubernetes, container orchestration. Domain Knowledge Understanding of capital markets, specifically: Credit risk (PD, LGD, EAD, credit exposure modeling, counterparty risk). Market risk (VaR, sensitivities, stress testing, pricing concepts). Familiarity with regulatory frameworks (e.g., Basel, FRTB, IFRS9) is a strong advantage. ________________________________________ Soft Skills Strong analytical and problem solving abilities. Excellent communication skills and ability to interact with technical and non-technical stakeholders. Collaborative, agile mindset with experience in Scrum/Agile environments. Ability to work independently and lead technical solutions end to end.

🏢 Summary: Senior Full Stack Developer role focused on building scalable, cloud-native applications using React on the frontend and C# .NET Core on the backend within capital markets risk domains. The position involves developing microservices, REST APIs, data pipelines with Python (PySpark), and enterprise Power BI solutions, while contributing to CI/CD, event-driven architectures, and cloud modernization initiatives. The role requires deep expertise in distributed systems and strong domain knowledge in credit and market risk. 🗂️ Requirements: 10+ years of professional software development experience, Strong expertise in React and JavaScript/TypeScript, Expert-level knowledge of C# and .NET Core, Experience building REST APIs and microservices, Hands-on experience with Python and PySpark for data processing, Extensive experience with Power BI dashboards, DAX, and data modeling, Strong knowledge of microservices and event-driven architectures, Experience with CI/CD pipelines and DevOps practices, Experience with Azure or AWS cloud platforms, Proficiency in SQL and relational databases, Experience with Docker and Kubernetes, Understanding of credit risk and market risk concepts in capital markets 📃 Skills: React, JavaScript, TypeScript, Redux, C#, .NET, REST, Python, PySpark, PowerBI, DAX, SQL, PostgreSQL, SQLServer, Docker, Kubernetes, Azure, AWS, Kafka, EventHub, Jenkins, GitHubActions 🏢 Description: About the Role We are seeking a highly experienced Senior Full Stack Developer with deep expertise in React on the frontend and C# .NET Core on the backend. The ideal candidate will have substantial hands-on experience developing scalable applications, strong exposure to cloud-native architectures, and a solid understanding of capital markets—particularly in credit risk and market risk domains. Experience with Python (pyspark) for data-driven workflows and a strong command of CI/CD, microservices, and event-driven architectures is essential. ________________________________________ Key Responsibilities •     Design, develop, and maintain full stack applications using React, C#.NET Core, and supporting technologies. •     Build high-performance backend services, RESTful APIs, and microservices with focus on scalability, maintainability, and resilience. •     Develop responsive, modular, and accessible UI components using React and modern JS/TS patterns. •     Collaborate closely with business stakeholders and risk domain experts to deliver solutions in credit risk, market risk, and related capital markets functions. •     Work with Python (pyspark) for data transformation, data pipelines, and analytics workflows. •     Develop, optimize, and maintain Power BI dashboards, data models, and analytical reports for business users. •     Implement and optimize CI/CD pipelines, ensuring robust automated testing, deployment, and monitoring. •     Architect and contribute to event-driven and distributed system designs using technologies such as Kafka, Event Hub, or similar. •     Drive engineering best practices: code reviews, unit/integration testing, performance tuning, documentation. •     Contribute to cloud migration and modernization initiatives, especially in Azure or AWS environments. •     Mentor junior developers and collaborate within a cross-functional agile team. ________________________________________ Required Skills & Experience Technical Skills •     10+ years of professional software development experience. •     Front-end: o     Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK, hooks, and modern UI patterns. •     Back-end: o     Expertise in C# .NET Core, C#, REST APIs, Web APIs, and microservices-based development. •     Python (pyspark): o     Hands-on experience with distributed data processing, data pipelines, and analytic transformations. •     Power BI: o     Extensive experience developing dashboards, data models, DAX calculations, and enterprise-grade BI solutions. o     Strong understanding of data modeling, performance tuning, and governance in Power BI. •     Architecture: o     Strong knowledge of microservices, API design, event-driven architectures, and distributed systems. •     DevOps / CI/CD: o     Experience with Azure DevOps, GitHub Actions, Jenkins, or similar. o     Strong understanding of automated builds, testing, deployment, and monitoring. •     Cloud Platforms: o     Experience with Azure or AWS (Azure preferred). •     Databases: o     Proficiency with SQL Server, PostgreSQL, or other relational databases; NoSQL knowledge a plus. •     Containerization: o     Experience with Docker, Kubernetes, container orchestration. Domain Knowledge •     Understanding of capital markets, specifically: o     Credit risk (PD, LGD, EAD, credit exposure modeling, counterparty risk). o     Market risk (VaR, sensitivities, stress testing, pricing concepts). •     Familiarity with regulatory frameworks (e.g., Basel, FRTB, IFRS9) is a strong advantage. ________________________________________ Soft Skills •     Strong analytical and problem solving abilities. •     Excellent communication skills and ability to interact with technical and non-technical stakeholders. •     Collaborative, agile mindset with experience in Scrum/Agile environments. •     Ability to work independently and lead technical solutions end to end.

🏢 Summary: Hybrid Team Lead FullStack role focused on building and scaling high-performance web applications using React and Node.js, while leading a development team. The position combines hands-on front-end and back-end development with architectural design, API development, and cloud-based deployments. You will drive technical excellence across the full software development lifecycle in an international R&D environment. 🗂️ Requirements: 7+ years full-stack development experience with React and Node.js, 2+ years experience in team leadership or senior developer role, Expertise in React.js, Redux, React Hooks, Strong knowledge of HTML5, CSS3, JavaScript (ES6+), Proficiency in Node.js and Express.js, Experience designing RESTful APIs or GraphQL APIs, Knowledge of OAuth, JWT or session-based authentication, Experience with PostgreSQL or MySQL, Experience with AWS, Azure or GCP, Experience with Docker and CI/CD pipelines 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, GraphQL, REST, OAuth, JWT, PostgreSQL, MySQL, AWS, Azure, GCP, Docker, Kubernetes, CI/CD, Webpack, Babel, Vite 🏢 Description: Team Lead FullStack (Node.js, React) IT · Warsaw (City Center) · Hybrid About the Client Our Client is a fast-growing, international technology company that provides innovative digital solutions for the global market. They are currently expanding and developing their R&D center in Warsaw. They are a leader in AI-powered enterprise operations, delivering digital solutions and consulting services that drive value and transform businesses. They specialize in using advanced technology to streamline operations, improve efficiency, and unlock new revenue opportunities, particularly within the private capital markets. With over a decade of experience supporting high-growth companies, they bring deep domain expertise and a proven ability to turn technology into a strategic advantage. Role Overview We are seeking a highly skilled Full Stack Team Lead with expertise in React and Node.js to lead our dynamic team. The ideal candidate will have over 7 years of experience in designing and building high-performance web applications, along with demonstrated leadership experience. You will lead a team of developers, working on both front-end and back-end development, contributing to every stage of the software development lifecycle, and mentoring junior team members. Key Responsibilities Team Leadership & Mentorship: Lead and mentor a team of software engineers, fostering a collaborative and high-performance environment. Provide technical guidance, conduct code reviews, and support professional development. Front-End Development: Build and maintain interactive and responsive user interfaces using React.js, Redux, and modern JavaScript (ES6+). Back-End Development: Develop robust, scalable server-side applications and RESTful APIs using Node.js and Express. Application Architecture & Integration: Design and implement scalable architectures and microservices that meet business needs, ensuring best practices are followed across the team. Collaborate with database engineers to design efficient database schemas and manage data interactions using MongoDB or SQL databases. Deployment & Testing: Manage deployments and ensure seamless delivery of updates using CI/CD pipelines and containerization tools like Docker. Ensure high-quality code by writing unit and integration tests, performing debugging, and optimizing application performance. Collaboration & Documentation: Work closely with designers, product managers, and other developers to deliver innovative and user-centric solutions. Create and maintain technical documentation for applications, APIs, and architectural decisions, ensuring team adherence to documentation standards. Requirements & Qualifications Experience & Education: 7+ years of professional experience in full-stack development with React and Node.js. 2+ years of experience in a team lead or senior leadership role, guiding and mentoring other developers. A Bachelor's degree in Computer Science or equivalent is preferred. Front-End Stack: Expertise in React.js, Redux, React Hooks, and component-based architecture. Strong knowledge of HTML5, CSS3, and modern JavaScript (ES6+). Familiarity with front-end tools like Webpack, Babel, or Vite. Back-End Stack: Proficiency in Node.js and Express.js for building server-side applications. Experience with API design and integration, including GraphQL (preferred) or RESTful services. Knowledge of authentication mechanisms such as OAuth, JWT, and session-based authentication. Database & DevOps: Hands-on experience with databases such as PostgreSQL or MySQL. Experience with cloud platforms such as AWS, Azure, or GCP. Familiarity with containerization tools like Docker and orchestration tools like Kubernetes is a plus. Soft Skills: Strong problem-solving and analytical skills. Excellent communication and collaboration abilities, with a proven ability to lead and motivate a team. Eagerness to stay updated on emerging technologies and trends, and to drive continuous improvement within the team. What Is Offered Compensation: Monthly compensation up to 9,000 USD gross . Contract Type: Employment Contract (Umowa o Pracę) ONLY . Please note that there is strictly no B2B option available for this position. Work Model: Hybrid (3 days working from the office located in the center of Warsaw, 2 days working from home). Stability: Long-term cooperation with a stable, international organization. Culture: We value creative problem solvers who learn fast, work well in an open and diverse environment, and enjoy pushing the bar for success ever higher. We do work hard, but we also choose to have fun while doing it.

🏢 Summary: Mid-level Java Full Stack Developer role focused on building and maintaining secure, mission-critical financial communication systems integrated with SWIFT services. The position emphasizes backend development with Java and Spring while contributing to frontend applications using React or Angular in a microservices architecture. The project involves developing REST APIs, processing financial messages, and working within an enterprise Agile environment. 🗂️ Requirements: 3–4 years of commercial software development experience, Strong proficiency in Java, Strong proficiency in Spring framework, Experience with React or Angular, Experience building REST APIs, Knowledge of HTTPS, SFTP, SOAP protocols, Understanding of microservices architecture, Understanding of containerization, Experience with Git and GitHub, Experience with Jenkins, Experience with Maven, Experience with Jira, Knowledge of SQL and MySQL, Familiarity with Linux environments 📃 Skills: Java, Spring, React, Angular, REST, HTTPS, SFTP, SOAP, Microservices, Containerization, Git, GitHub, Jenkins, Maven, Jira, SQL, MySQL, Linux 🏢 Description: Java Full Stack Developer (Mid Level) | Java + React.js / Angular 📍 Location: Warsaw, Poland 💼 Work Model: Hybrid ( 2 days/week onsite – mandatory) We are looking for a skilled Mid-Level Java Full Stack Developer to join an international Enterprise SWIFT team working on mission-critical financial communication solutions for a global client. This role is ideal for engineers who enjoy backend-focused development while also contributing to modern frontend applications using React.js or Angular. 🔹 Project Overview You will work on secure enterprise integrations connected with SWIFT Alliance Cloud, building and enhancing systems responsible for message transmission, transformation, routing Key responsibilities include: • Developing REST APIs and backend services using Java & Spring • Integrating with SWIFT Alliance Cloud protocols and services • Processing and transforming financial messages/files • Building scalable microservices-based solutions • Supporting frontend development in React.js or Angular • Collaborating closely with Product, QA, DevOps, and Agile teams • Participating in code reviews, architecture discussions, and continuous improvement initiatives 🛠 Required Skills • 3–4 years of commercial experience • Strong Java & Spring expertise • Experience with React.js or Angular • Knowledge of REST API, HTTPS, SFTP, SOAP • Understanding of microservices and containerization • Experience with Git/GitHub, Jenkins, Maven, Jira • SQL & MySQL knowledge • Familiarity with Linux environments • Strong analytical and problem-solving skills ⭐ Nice to Have • Python experience • Experience in enterprise integration or banking/financial projects • Exposure to Agile/Scrum methodologies If you are a proactive Java Full Stack Engineer looking for a challenging long-term opportunity in Warsaw - we would love to connect with you.

🏢 Summary: Mid-level Full-stack Developer role focused on building and maintaining web and mobile applications using React and .NET technologies. The position involves developing scalable backend services, microservices, and SEO-friendly frontends integrated with CMS, within a multinational Agile environment. The role combines frontend, backend, cloud, and DevOps responsibilities with regular team collaboration. 🗂️ Requirements: 2–4 years experience as FullStack Developer, .NET 8/10 proficiency, C# proficiency, Strong React knowledge, JavaScript proficiency, TypeScript proficiency, HTML5 knowledge, CSS3 knowledge, Experience with RESTful APIs, Experience with Git, Experience with Microsoft Azure (Functions, Durable Functions, CosmosDB, ServiceBus, Application Insights), Experience with CI/CD pipelines, Experience with Agile methodologies, Communicative English (B2+) 📃 Skills: .NET, C#, React, JavaScript, TypeScript, HTML5, CSS3, REST, Git, Azure, Functions, CosmosDB, ServiceBus, ApplicationInsights, CI/CD, ReactNative, Expo, Sanity, GROQ, Redux, RxJS, Tanstack, Sentry, Firebase, Analytics 🏢 Description: Join Our Team as a Full-stack Developer (React, C#)! We are seeking a talented Mid FullStack Developer proficient in .NET and React to join our team. As part of our company culture, we value collaboration and regular in-person interactions. Our team meets every two months in our Poznań office for informal gatherings to connect, share ideas, and strengthen teamwork in a relaxed setting. You will work in multinational environment and will be responsible for designing and implementing software solutions, utilizing both front-end and back-end technologies. This role requires strong problem-solving skills, excellent communication abilities, and a passion for delivering high-quality code. Ready to take the next step in your career? Apply now and join us! Key Responsibilities: • Design and develop SEO-friendly web application, based on React and TypeScript and integrated with Sanity CMS. • Contributing to a mobile application using React Native, TypeScript and Expo . • Build and maintain microservices to enhance the web experience, including features like roadside assistance, car repair bookings, and membership management. • Develop robust and scalable backend systems using .NET 8/10, Azure ServiceBus, Functions, CosmosDB and more. • Utilize Sentry for error monitoring and Google Analytics/Firebase to track user behaviour and optimize performance. Requirements : Proven experience (2-4 years) as a FullStack Developer Proficiency in .NET (preferably .NET 8/10), C# Strong understanding of front-end technologies, including React, JavaScript, TypeScript, HTML5, and CSS3 Practical knowledge of clean-code principles and patterns, drive to write clean, testable and maintainable code Experience with RESTful APIs and Web Services Knowledge of version control systems, such as Git Excellent problem-solving and analytical skills Familiarity with Microsoft Azure platform (Functions and Durable Functions, CosmosDb, ServiceBus, Application Insights) Experience with DevOps approach and CI/CD pipelines Strong communication and interpersonal skills, communicative English (B2+) Experience with Agile development methodologies Nice to have: Experience in working with Sanity CMS and GROQ query language (or any other headless CMS) Familiarity with Figma or similar tools At least basic knowledge about Server Side Rendering and libraries like: Redux, RxJS, Tanstack Experience in working with mobile apps and practical knowledge of React Native, Expo, Expo Application Services Knowledge of microservices architecture and software integration patterns We offer: Conference/workshop budget of approximately 10000 PLN!- the budget renews every year and can be used for conferences, workshops, training programs, certifications, studies, or other development initiatives. "Fabresikowe": one-time 1000 PLN bonus to create your work space more comfortable and more tailored to your needs! Relaxing office massages In-house trainings Team events Frequent company events Free breakfast every day Free beverages, fresh fruit, snacks Chill out room English and Norwegian classes

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

🏢 Summary: Full Stack Senior Java Developer role focused on designing and delivering scalable web applications using Java and React.js in an Agile environment. The position involves building high-performance front-end components, developing RESTful microservices, and managing cloud-based deployments with modern DevOps practices. This is a hybrid role with long-term cooperation on high-impact, international projects. 🗂️ Requirements: Bachelor’s or Master’s degree in Computer Science, Engineering or related field, 5+ years of experience as Full Stack Developer with Java and React.js, Commercial experience with Agile methodologies, Strong experience in RESTful API and microservices development, Hands-on experience with SQL and NoSQL databases, Experience with CI/CD pipelines and containerization tools, Knowledge of authentication and authorization mechanisms 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, React, Redux, TypeScript, JavaScript, HTML5, CSS3, MaterialUI, Bootstrap, Tailwind, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, Jenkins, GitHubActions, GitLab, AWS, Azure, GCP, Docker, Kubernetes 🏢 Description: Senior Java Developer IT · Warsaw (City Center) · Hybrid About the Client Our Client is a fast-growing, international technology company that provides innovative digital solutions for the global market. They are currently expanding and developing their R&D center in Warsaw. They focus on building high-quality, scalable products using modern tech stacks and agile methodologies. With a strong emphasis on engineering excellence, they offer a collaborative environment where experts can thrive and influence the technical direction of the products. Please note: Optiveum is a recruitment agency conducting this search on behalf of our Client. Role Overview We are seeking a highly skilled Full Stack Developer with expertise in Java and React.js to join our dynamic team. The ideal candidate should have over 5 years of experience in designing, developing, and deploying scalable web applications. This role requires strong front-end and back-end development expertise, working in an Agile environment to deliver high-quality software solutions. Key Responsibilities Front-End Development: Design and develop interactive, responsive, and high-performance UI components using React.js, Redux, and modern JavaScript (ES6+). Ensure cross-browser compatibility and a seamless user experience, while optimizing front-end performance and implementing best practices in UI/UX design. Back-End Development: Develop and maintain RESTful APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement robust authentication, authorization, and data management solutions, working with relational and NoSQL databases such as PostgreSQL, MySQL, and MongoDB. System Integration & Deployment: Integrate third-party services, APIs, and cloud-based solutions. Manage deployments using CI/CD pipelines and containerization tools like Docker & Kubernetes. Code Quality & Testing: Write clean, maintainable, and efficient code following best practices. Implement unit and integration tests for both front-end and back-end components. Collaboration & Agile Development: Work closely with UI/UX designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to continuous process improvements. Requirements & Qualifications Experience & Education: Bachelor's or Master's degree in Computer Science, Engineering, or a related field. 5+ years of professional experience as a Full Stack Developer with Java & React.js, alongside experience working with Agile development methodologies. Front-End Stack: Proficiency in React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript (ES6+). Strong understanding of state management libraries and component-based architecture. Experience with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Back-End Stack: Expertise in Java, Spring Boot, Hibernate, JPA, and RESTful API development. Experience with microservices architecture and API Gateway implementations. Knowledge of authentication mechanisms like OAuth2, JWT, and session-based authentication. Database & DevOps: Experience with SQL databases (PostgreSQL, MySQL) and NoSQL databases (MongoDB, Redis). Hands-on experience with CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD). Familiarity with cloud platforms (AWS, Azure, GCP) and containerization using Docker, Kubernetes. Soft Skills: Strong problem-solving and analytical skills. Excellent communication and teamwork abilities. Ability to manage multiple priorities in a fast-paced environment. Passion for learning new technologies and improving existing processes. What Is Offered Compensation: Monthly compensation up to $6,200 (depending on experience and interview results). Contract Type: B2B contract via Optiveum. Work Model: Hybrid (3 days working from the office located in the center of Warsaw, 2 days working from home). Stability: Long-term cooperation with a stable, international organization. Growth: Opportunity to work with the latest technologies and high-impact projects.

🏢 Summary: Remote B2B Full Stack Developer (Mid/Senior) role with strong focus on frontend (70–80%) using React, Next.js and TypeScript, plus backend development in Java/Spring. The position involves building and integrating headless WordPress CMS, developing REST APIs and microservices, and working in a modular, cloud-based architecture. Long-term collaboration in an Agile environment with CI/CD and DevOps practices. 🗂️ Requirements: Minimum 4 years commercial experience in frontend development, Very good knowledge of JavaScript (ES6+) and TypeScript, Strong experience with React, Experience with state management (Redux or Zustand), Experience with Next.js (SSR/SSG), Minimum 2 years commercial experience with Java, Experience with Spring framework, Experience with Oracle DB and SQL/PLSQL, Experience in building and integrating REST APIs, Experience with Kafka, Experience with Maven, Experience with Docker, Experience with Git, Experience with Headless WordPress, Ability to create Gutenberg blocks, Knowledge of HTML5, CSS3, SASS/SCSS, Experience with Tailwind, Experience with responsive design and WCAG, Experience with Jest and React Testing Library, Knowledge of CI/CD (GitLab CI or Jenkins), Knowledge of AWS or Azure, Knowledge of frontend security (OWASP, XSS, CSRF, CORS), Experience working in Scrum/Agile, English at technical level 📃 Skills: JavaScript, TypeScript, React, Next.js, Redux, Zustand, Java, Spring, Oracle, SQL, PLSQL, REST, GraphQL, Kafka, Maven, Docker, Kubernetes, Git, Bitbucket, WordPress, Gutenberg, HTML5, CSS3, SASS, SCSS, Tailwind, Jest, Cypress, Playwright, GitLab, Jenkins, AWS, Azure, OWASP, XSS, CSRF, CORS, Figma, Lighthouse 🏢 Description: Full Stack Developer (MID / SENIOR) B2B | Remote | React + Java Opis stanowiska Poszukujemy doświadczonego Full Stack Developera (Mid/Senior) , którego rola będzie silnie ukierunkowana na frontend (ok. 70–80% czasu pracy). Zakres frontendowy obejmuje: React, Next.js, TypeScript integracje headless CMS (WordPress) Backend stanowi mniejszą część pracy (20–30%), jednak oczekujemy swobodnego poruszania się w ekosystemie Java/Spring – na poziomie umożliwiającym tworzenie prostych endpointów, mikroserwisów lub lambd oraz rozumienie architektury systemu jako całości. Mile widziane doświadczenie w zespołach typu Growth / Product , gdzie liczy się szybkie iterowanie i praca na danych. Wymagania techniczne Frontend (JavaScript / TypeScript) Core & Frameworki Bardzo dobra znajomość JavaScript (ES6+) oraz TypeScript Minimum 4 lata komercyjnego doświadczenia frontendowego React (bardzo dobra znajomość) State management: Redux lub Zustand SSR / SSG: Next.js (lub Gatsby) Backend (Java) Minimum 2 lata komercyjnego doświadczenia Java 8–19 Spring (od wersji 1.5+ ) Bazy danych: Oracle DB (SQL + PL/SQL) Tworzenie i integracja REST API Kafka (message broker) Maven (MVN) Docker Git / Bitbucket CMS & Headless WordPress 6+ Doświadczenie z WordPress jako Headless CMS Tworzenie dedykowanych bloków Gutenberg UI / UX HTML5, CSS3, SASS / SCSS Tailwind CSS Implementacja interfejsów pixel-perfect (Figma) RWD Dostępność cyfrowa / WCAG Architektura & Integracje Architektura modułowa, praca z Monorepo Client–Server, komunikacja asynchroniczna Integracje: REST, GraphQL QA & Wydajność Testy: Jest, React Testing Library, Cypress, Playwright (mile widziane) TDD / BDD Znajomość YETI (atut) Optymalizacja wydajności (DevTools, Lighthouse) Clean Code DevOps / CI/CD / Security Git, Bitbucket CI/CD: GitLab CI lub Jenkins Docker, podstawy Kubernetes Chmura: AWS lub Azure Bezpieczeństwo frontendowe: OWASP XSS, CSRF, CORS, Clickjacking Umiejętności miękkie Doświadczenie w pracy w Scrum / Agile Bardzo dobra komunikacja (ścisła współpraca z Biznesem) Jira, Confluence Code Review i mentoring młodszych programistów Język angielski – poziom techniczny (dokumentacja, praca w zespole międzynarodowym) Warunki współpracy Start: 01.03.2026 Współpraca długoterminowa Co druga środa możliwe wdrożenie nocne (od 22:00) Praca zdalna: 100% możliwa(mile widziane okazjonalne wizyty w biurze) Co zyskasz dzięki aplikacji na ofertę Antal? Gdy Twoja aplikacja zostanie rozpatrzona pozytywnie (zostaniesz zaproszony/a do procesu), otrzymasz wsparcie Konsultanta/Konsultantki, który/a utrzyma z Tobą stały kontakt (mailowo lub telefonicznie), pomoże Ci przygotować się do rozmowy rekrutacyjnej z przyszłym pracodawcą oraz zatroszczy się o jakość procesu rekrutacyjnego, w którym aktualnie bierzesz udział. Kim jesteśmy? Jesteśmy liderem rekrutacji specjalistów i menedżerów oraz doradztwa w obszarze HR. Marka obecna jest w 35 krajach, w Polsce działa od 1996 roku. Przez ten czas zbudowaliśmy wiele karier kandydatów, dzięki elastycznemu i kompleksowemu podejściu do wszystkich rekrutacji. Antal tworzy ponad 130 profesjonalnych konsultantów ds. rekrutacji, którzy są oni nie tylko skutecznymi rekruterami, ale także wykwalifikowanymi doradcami, specjalizującymi się zarówno w zakresie wybranego sektora, jak i stanowiska.