Senior Frontend Developer

🏢 Summary: B2B contract role for a banking project focused on payment systems integration and operations, requiring onsite presence in Warsaw twice a week. The engagement runs through the end of the year with possible extension and involves working with Polish banking payment standards and international messaging formats. 🗂️ Requirements: Experience in banking sector, Experience with SWIFT payments, Knowledge of ISO20022 standard, Experience with SORBNET system, Experience with ELIXIR system, English level B1 minimum, Availability for onsite work in Warsaw 2 days/week, Maximum 1 month notice period 📃 Skills: SWIFT, ISO20022, SORBNET, ELIXIR, Banking, Payments, English 🏢 Description: The client is one of Poland’s banks Key details: Location: 2 days/week from the Warsaw office Rate: 50–80 PLN/hour net + VAT Employment type: B2B contract Duration: through the end of the year + possible extensions Recruitment process: 1 or 2 stages English: B1 Luxmed, MultiSport, equipment provided by the client - Experience in the banking sector / with SWIFT, ISO20022, SORBNET, and ELIXIR payments - Polish team - Max. 1 month’s notice Hays Poland sp. z o.o. is an employment agency registered in a registry kept by Marshal of the Mazowieckie Voivodeship under the number 361.

🏢 Summary: B2B Project Manager role in an international pharmaceutical environment, leading automation and laboratory system implementation projects across Poland. The position focuses on managing end-to-end greenfield and modernization initiatives, including feasibility analysis, cost estimation, and integration of IT and laboratory systems. Work is delivered in Agile/Waterfall/Kanban with a mix of remote work and business travel. 🗂️ Requirements: Minimum 5 years of project management experience, Experience in medical or laboratory industry, Experience leading end-to-end greenfield projects, Documented use of project planning tools, Experience implementing IT or laboratory systems, Ability to manage multiple complex projects simultaneously, Experience with Agile, Waterfall or Kanban methodologies, English level B2+/C1, Polish language proficiency, Valid driver’s license and willingness to travel, Higher education degree 📃 Skills: Agile, Waterfall, Kanban, ProjectManagement, Automation, LaboratorySystems, ITPlatforms, CostEstimation, Budgeting, Scheduling, ProcessOptimization, StakeholderManagement 🏢 Description: The client is an international pharmaceutical company Key details: Location: 50/50 remote work/business trips within the Lublin province Rate: 100–120 PLN/hour net + VAT (travel expenses covered by the client) Employment type: B2B contract Duration: min. 12 months + extensions (planned employment for 3 years) Recruitment process: 2 stages (HR and technical) English: B2+/C1 (Polish is also required) Luxmed, MultiSport, equipment provided by the client Responsibilities: • Lead and manage strategic and operational projects for clients in line with company objectives • Collaborate with stakeholders to optimize business processes and improve customer service quality • Implementing new procedures, laboratory systems, and IT platforms while ensuring their seamless integration • Supporting sales and marketing teams in tenders and contributing to sales growth among clients • Support collaboration with internal teams and external partners to strengthen expertise and strategy • Work on several projects simultaneously; duration of a single project: 3 to 6 months • Work in Agile/Waterfall/Kanban (depending on the project) Projects related to assessing the feasibility of implementing automation in laboratories, e.g., evaluating the adaptability of facilities to the needs of automated laboratories, assessing the technical conditions of the premises, verifying utility connections, analyzing the existing building architecture, preparing cost estimates and assessing the costs/time required for modernization, preparing a work schedule and conducting training Profile: • Valid driver’s license and willingness to travel throughout Poland • 5 years of experience in project management, preferably in the medical or laboratory industry (business-oriented PM) • Knowledge of and documented experience using planning tools • College degree • Proactive attitude, strong analytical, organizational, and problem-solving skills • Strong interpersonal and communication skills with a customer-oriented approach (negotiations, budgeting, preparing and collecting bids, assigning responsibilities within the team, ensuring timeliness) • Proven success in managing complex projects and cross-team collaboration • Knowledge of hospital and laboratory organizational structures is a plus • Leading end-to-end (greenfield) projects • Collaboration with other project managers • SM certification is a plus About the Company A division of the company dedicated to developing innovative laboratory solutions. The Project Manager will play a key role in implementing high-quality projects, optimizing client workflows, and striving for operational excellence, positioning the company as a trusted partner in healthcare innovation. Hays Poland sp. z o.o. is an employment agency registered in a registry kept by Marshal of the Mazowieckie Voivodeship under the number 361

🏢 Summary: B2B contract for a Senior Java Developer to design, implement, and modernize a large-scale Terminal Management System handling 300k+ payment terminals. The role focuses on developing and migrating distributed systems components using Spring Boot and WildFly, integrating multiple internal and external services, and improving security through vulnerability scanning and upgrades. 🗂️ Requirements: Very good knowledge of Java 8+, Strong object-oriented programming skills, Experience in designing, implementing, documenting and testing application components, Very good practical knowledge of Spring and Spring Boot, Very good practical knowledge of Hibernate/JPA and JEE, Experience with message queue systems, especially RabbitMQ, Knowledge of Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, Jira, Knowledge of relational databases, particularly Oracle, Practical knowledge of RESTful API design, Experience in system integration, Experience with distributed systems, Experience with JBoss/WildFly application servers, Knowledge of security scanning tools (e.g., Fortify, Sonatype), Availability to work 4 days per week from Warsaw office, Full availability in Polish time zone 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, GitLab, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly, Fortify, Sonatype, Hazelcast, GWT, GWTExt, SOAP, RMI 🏢 Description: The client is an American multinational company in the fintech industry Key details: Location: 4 days/week from the Warsaw office Rate: 130–180 PLN/hour net + VAT Job type: B2B contract Duration: 12 months + extensions Recruitment process: 2 stages English and Polish: B2/B2+ Luxmed, MultiSport, equipment provided by the client Job Responsibilities Design and implementation of IT solutions based on the presented analytical and technical documentation; Reviewing analytical documentation; Creating technical documentation; Technical upgrade for existing system; Working with legacy code Conducting regular scans in the application and removing vulnerabilities Job Requirements Fully available in the Polish time zone; Ability to work from the office in Warsaw (weekly: 4 days at office + 1 day WFH ); Very good knowledge of Java 8+ and object-oriented programming issues; Experience in independent design, implementation, documentation and testing of application components; Very good and p ractical knowledge of Spring, Spring Boot, Hibernate/JPA and JEE frameworks; Practical knowledge with message queue systems, particularly RabbitMQ; Practical knowledge of tools supporting the software development process: Maven, Git, Gitlab, Gitlab CI/CD, Jenkins, Nexus, Jira; Knowledge of relational databases, in particular Oracle; Practical knowledge of RESTful API design; Experience in system integration; Experience with distributed systems; Experience with application servers, JBoss/WildFly; Knowledge of scannnfg tools (Fortify, Sonatype..) Description of the area of involvement TMS (Terminal Management System) is used to manage a very large number of payment terminals (300k+), it gives users a uniform way to manage different terminals from different hardware vendors. TMS has a complex architecture, consisting of two components TMS (1 WildFly instance) providing GUI and implementing some business functions and RTMS (3 Spring-boot instances) implementing most of the business functionalities. A gradual migration from TMS to RTMS is being carried out. The system intensively uses Spring, Hibernate and RabbitMQ. The system has distributed transactions (different two-phase-commit, saga approaches) and distributed cache (Hazelcast). TMS is integrated with many internal and external systems (via REST, SOAP, RMI, direct database connections and database links). The GUI is written in GWT and GWTExt. Hays Poland sp. z o.o. is an employment agency registered in a registry kept by Marshal of the Mazowieckie Voivodeship under the number 361

🏢 Summary: Long-term B2B opportunity for a senior engineer to deliver production-ready code and shape system architecture in a microservices environment. The role combines hands-on Java and React development with architectural responsibilities in a global, collaborative setup. It focuses on high-frequency delivery and technical excellence within the financial sector. 🗂️ Requirements: Strong Java experience (latest versions), Strong React experience, Experience with microservices architecture, Experience delivering RESTful APIs, Experience with PostgreSQL, Proven high-frequency code delivery, Experience in banking or financial sector 📃 Skills: Java, React, Microservices, REST, PostgreSQL, Banking, Docker, Kubernetes 🏢 Description: Working mode : Hybrid - 6 days per month at the Warsaw office Contract type : B2B, long term cooperation Rate : 200 PLN/h Summary: This role focuses on hands-on development and system architecture, driving engineering culture, and enhancing business growth through technical expertise in a collaborative, global environment. Main Responsibilities: Deliver code to production and support system architecture aligned to microservices Understand business, engineering, and non-functional requirements Drive the desired engineering culture across teams Collaborate with a globally diverse team across regions Proactively remove impediments, assess risks, and communicate issues to program management Identify and eliminate process inefficiencies Key Requirements: Strong Java and React programming experience Experience in microservice architecture Background in the financial sector, particularly banking Proven capability of delivering code changes at high frequency Experience with RESTful API delivery Familiarity with PostgreSQL databases Recent Java experience, preferably with the latest versions Experience with ReactJS for UI application development Nice to Have: Knowledge of containers and orchestration technologies like Docker and Kubernetes. Other Details: This position offers the opportunity to work within a multi-regional team on innovative projects. Ideal for candidates seeking to leverage their development skills in a dynamic and evolving business context.

🏢 Summary: Long-term B2B contract for a Senior Full Stack Developer focused on backend development in .NET and system integrations within a media project. The role involves building and integrating APIs, middleware workflows, and SQL-based data solutions, with additional work on internal React tools and cloud environments. The position combines hands-on development, modernization, security implementation, and automated testing in a hybrid work model. 🗂️ Requirements: Minimum 5-6 years of experience in C# and .NET, Strong experience in API development and system integrations, Experience with middleware or iPaaS platforms, Experience working with distributed systems and cross-platform data flows, Strong knowledge of SQL and data transformation, Experience with cloud environments (AWS preferred), Ability to implement security mechanisms such as OAuth and JWT, Experience with automated testing frameworks, Ability to participate in code reviews and mentor junior developers, English proficiency at B2/C1 level 📃 Skills: C#, .NET, React, SQL, T-SQL, Workato, PowerAutomate, API, REST, OAuth, JWT, xUnit, NUnit, Jest, AWS, iPaaS, Middleware 🏢 Description: Hays IT Contracting is a cooperation based on B2B rules. We connect IT specialists with the most interesting, technological projects on the market. Join the group of 500 satisfied Contractors working for Hays’ clients! For our Client we are currently looking for Candidates for the position of: Senior Full Stack Developer (.NET, React, Middleware) Location: Warsaw Branch: media (an American company) Job type: B2B (with Hays Poland) Length: long-term Rate: 140-160 PLN/h net Start date: ASAP / 1 month Working hours: business hours, with occasional meetings during US working hours Working model: hybrid 2/3 (TBC) What will you do: 1. Core Development & Integration ·       Integration Workflows: Designing and implementing integration flows and automation tasks using iPaaS or workflow platforms (e.g., Workato, Power Automate) to support data exchange between business systems. ·       Backend Development: Developing and enhancing backend components and services in C# /.NET, focusing on application logic, data processing, and communication within the project scope. ·       Internal Tools Support: Implementing and maintaining internal tools, dashboards, or auxiliary interfaces in React to support data visibility and integration monitoring. ·       Database Engineering: Creating and optimizing MS SQL queries and stored procedures to support performance, data accuracy, and operational requirements in assigned technical tasks. 2. Technical Collaboration ·       Knowledge Exchange: Cooperating with other technical team members on problem solving and information sharing related to backend topics, API usage, or database practices as part of ongoing project work. ·       Code Review Participation: Participating in code reviews by providing technical feedback to ensure consistency, maintainability, and alignment with established project guidelines. ·       Modernization & Refactoring: Executing modernization tasks, including improving or refactoring existing components and codebases based on technical specifications and project requirements. 3. Security & Quality Assurance ·       Security Implementation: Applying established security mechanisms—such as OAuth, JWT, and data encryption—within integration and communication processes, according to project needs. ·       Automated Testing: Developing automated tests (e.g., xUnit, NUnit, Jest) to support service stability, detect changes in data or external systems, and improve overall solution reliability. What we expect from you: ·       Minimum 5-6 years of experience in C# /.NET programming ·       Some frontend exposure (React) beneficial but not core ·       Focus on APIs, system integrations, and middleware (e.g. Workato, Power Automate or similar) ·       Experience working across distributed systems and data flows between platforms ·       Comfortable with SQL and data transformation · Able to mentor junior developers and contribute to code quality and best practices ·       Experience with cloud environments (AWS preferred) ·       Knowledge of English on B2/C1 level What will you get: ·       Competitive salary ·       Standard benefits - preferential rates for LuxMed and Multisport packages ·       When you choose to work via Hays, you also get the opportunity to work for many of Hays' other leading clients in the future What will the recruitment process look like: 1.     Your CV will be verified by Hays Recruiter 2.     Recruiter will contact you by phone - a 15-minute conversation about the project and your experience 3.     Technical conversation with the client – 2 online meetings 4.     Offer 5.     Welcome to the project! Hays Poland sp. z o.o. jest agencją zatrudnienia zarejestrowaną w rejestrze prowadzonym przez Marszałka Województwa Mazowieckiego pod numerem 361.

🏢 Summary: Long-term B2B contract for an experienced React Native Developer to integrate React Native into an existing native mobile platform in the banking sector. The role focuses on hybrid mobile architecture, combining React Native with iOS and Android applications, and evolving a scalable mobile solution. Hybrid work model with regular onsite presence in Warsaw. 🗂️ Requirements: Strong experience with React Native, Experience in native mobile development (iOS or Android), Proven experience integrating React Native into existing native applications, Experience designing hybrid mobile architectures, Experience with Angular 📃 Skills: React, ReactNative, iOS, Android, Angular, JavaScript, TypeScript 🏢 Description: Industry: banking Rate: up to 160 pln/h net + VAT, B2B Location: Warsaw - hybrid (2 days in the office per week) Long-term cooperation Introduction & Summary We are seeking experienced React Native Developers to assist with a brownfield project focused on integrating React Native into our existing native mobile platform. Main Responsibilities Design and implement solutions that combine React Native with existing native (iOS/Android) applications. Define and drive architectural decisions for hybrid mobile development. Collaborate with teams to ensure smooth integration and optimal performance. Support the evolution of the current mobile platform using a scalable approach. Key Requirements Strong experience with React Native. Solid background in native mobile development (iOS and/or Android). Proven experience in integrating React Native into existing native applications. Strong architectural and problem-solving skills. Experience with Angular. English - minimum B2. Nice to Have Experience with brownfield projects.

🏢 Summary: Long-term B2B contract for an experienced React Native Developer to integrate React Native into an existing native mobile platform within the banking sector. The role focuses on hybrid mobile architecture, combining React Native with iOS and Android applications in a brownfield environment. Work in a hybrid model with involvement in architectural decisions and platform evolution. 🗂️ Requirements: Strong experience with React Native, Experience in native mobile development (iOS or Android), Proven integration of React Native into existing native applications, Ability to design hybrid mobile architecture, Experience with Angular 📃 Skills: ReactNative, iOS, Android, Angular, React 🏢 Description: Industry: banking Rate: up to 160 pln/h net + VAT, B2B Location: Warsaw - hybrid (2 days in the office per week) Long-term cooperation Introduction & Summary We are seeking experienced React Native Developers to assist with a brownfield project focused on integrating React Native into our existing native mobile platform. Main Responsibilities Design and implement solutions that combine React Native with existing native (iOS/Android) applications. Define and drive architectural decisions for hybrid mobile development. Collaborate with teams to ensure smooth integration and optimal performance. Support the evolution of the current mobile platform using a scalable approach. Key Requirements Strong experience with React Native. Solid background in native mobile development (iOS and/or Android). Proven experience in integrating React Native into existing native applications. Strong architectural and problem-solving skills. Experience with Angular. English - minimum B2. Nice to Have Experience with brownfield projects.

🏢 Summary: Long-term B2B hybrid role focused on hands-on Java and React development within a microservices architecture, contributing directly to production code and system design. The position emphasizes high-frequency delivery, REST API development, and collaboration in a global engineering environment. It combines technical leadership with active development in financial-sector projects. 🗂️ Requirements: Strong experience with Java, Strong experience with ReactJS, Experience with microservices architecture, Experience delivering RESTful APIs, Experience with PostgreSQL, Recent experience with modern Java versions, Ability to deliver code changes frequently, Background in banking or financial sector 📃 Skills: Java, ReactJS, Microservices, REST, PostgreSQL, Docker, Kubernetes 🏢 Description: Working mode: Hybrid - 6 days per month at the Kraków office Contract type: B2B, long term cooperation Rate: 200 PLN/h Summary: This role focuses on hands-on development and system architecture, driving engineering culture, and enhancing business growth through technical expertise in a collaborative, global environment. Main Responsibilities: Deliver code to production and support system architecture aligned to microservices Understand business, engineering, and non-functional requirements Drive the desired engineering culture across teams Collaborate with a globally diverse team across regions Proactively remove impediments, assess risks, and communicate issues to program management Identify and eliminate process inefficiencies Key Requirements: Strong Java and React programming experience Experience in microservice architecture Background in the financial sector, particularly banking Proven capability of delivering code changes at high frequency Experience with RESTful API delivery Familiarity with PostgreSQL databases Recent Java experience, preferably with the latest versions Experience with ReactJS for UI application development Nice to Have: Knowledge of containers and orchestration technologies like Docker and Kubernetes. Other Details: This position offers the opportunity to work within a multi-regional team on innovative projects. Ideal for candidates seeking to leverage their development skills in a dynamic and evolving business context.

🏢 Summary: 100% remote B2B contract for a senior Full Stack Developer to deliver and maintain enterprise applications, focusing on urgent project phases through July 2026. The role requires independent ownership of a client’s finance module and rapid delivery of high-quality, scalable, and secure solutions. Work includes both front-end and back-end development in a microservices-based architecture. 🗂️ Requirements: 10+ years of commercial experience, Strong experience in Java development, Strong experience with Spring Boot, Experience with microservices architecture, Experience with React.js, Full-stack development experience, Experience with REST APIs, Knowledge of integration patterns, Experience with cloud-ready applications, Ability to independently handle finance module 📃 Skills: Java, SpringBoot, Microservices, React, REST, APIs, Cloud, Integration, Fullstack 🏢 Description: 100% remote B2B: 180-190 zł/h netto + VAT Contract till end of July 2026 (chance of extension) Experience Level: 10+ years of experience Must be able to work independently and deliver quickly Must be able to independently handle the clients finance module Core Responsibilities: Develop and maintain both front-end and back-end components of enterprise applications Work on urgent deliverables for Phase 1 and potentially Phase 2 Collaborate with internal teams Ensure high-quality, scalable, and secure solutions within tight timelines Technical Skills Required: Java Spring Boot (including microservices architecture) React.js (front-end development) Strong understanding of full stack development principles Experience with REST APIs , integration patterns , and cloud-ready applications Familiarity with CI/CD pipelines , containerisation (Docker/Kubernetes) is a plus Soft Skills: Ability to work independently with minimal supervision Strong problem-solving and troubleshooting skills Excellent communication and collaboration skills What we offer: 100% remote Multisport card Private heatlhcare Life insurance

🏢 Summary: Offer for an experienced React FrontEnd Developer to design and build responsive, high-performance user interfaces in a hybrid model in Warsaw. The role focuses on developing modern web applications using React and related technologies, with strong emphasis on testing, accessibility, and performance optimization. The position involves close collaboration with cross-functional teams to deliver robust, user-centric digital products. 🗂️ Requirements: 6+ years of experience in JavaScript development, 6+ years of experience in TypeScript development, Commercial experience with React.js, Experience with Redux, Hands-on experience with HTML5, Hands-on experience with CSS3, Ability to write cross-browser compatible code, Understanding of object-oriented programming concepts and design patterns, Knowledge of functional programming paradigms, Understanding of asynchronous programming, Experience with TDD, Experience with continuous integration, Knowledge of Git and branch management, Experience with front-end debugging tools, Experience working in Agile methodology 📃 Skills: JavaScript, TypeScript, React, Redux, Next.js, HTML5, CSS3, Git, TDD, CI, OOP, FP 🏢 Description: React FrontEnd 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 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 skilled React FrontEnd Developer to design and develop responsive user interfaces. In this role, you will collaborate with cross-functional teams to deliver robust, user-centric solutions while driving best practices in testing, accessibility, and performance optimization. Key Responsibilities UI Development: Designing and developing responsive user interfaces using React Testing & Integration: Implementing and maintaining TDD in applications and continuous integration. Driving best practices in testing, accessibility, and performance optimization. Collaboration: Collaborating with a cross-functional team of project managers, project analysts, and sales staff to deliver high-quality, interactive products on time. Collaborating cross-functionally with design, backend, QA, and product teams to deliver robust and user-centric solutions. Requirements & Qualifications Experience & Education: 6+ years of experience in JavaScript and TypeScript development. A Bachelor's degree in Computer Science or equivalent is preferred. Core Tech Stack: Must know a modern front-end JS framework, such as React.js + Redux; Next.js is a bonus. Hands-on experience with HTML5, CSS3. Proficiency in writing cross-browser compatible code. Programming Paradigms: Should understand OO concepts and design patterns, and their application to JavaScript development. Knows functional programming paradigms. Understands asynchronous programming paradigms and best practices. Tools & Debugging: Git and branch management knowledge. Experience debugging front-end problems and a knowledge of front-end debugging tools. Familiarity with custom package creation and integration. Soft Skills & Methodology: Experience with Agile methodologies and development practices. Good communication skills and good organization skills. Ability to work under pressure and deliver against tight deadlines. What Is Offered Compensation: Monthly compensation up to $4,800 USD . 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.