Full Stack JavaScript Developer (Node.js / React)

🏢 Summary: Full Stack JavaScript Developer role focused on building and scaling a complex data processing and analytics platform, covering backend services, frontend applications, and large-scale data pipelines. The position involves developing RESTful APIs, microservices, and modern React applications, while optimizing databases and performance in a cloud environment. The role includes active contribution to architecture, code quality, and production support. 🗂️ Requirements: Strong experience with Node.js (v22+), Experience with Express.js, Solid knowledge of React (v16+), Experience with PostgreSQL and query optimization, Very good understanding of asynchronous JavaScript, Experience designing RESTful APIs, Knowledge of microservices architecture, Understanding of distributed systems, Experience with Jest or Mocha, Experience with Git, Experience with Webpack or Rollup, Understanding of web security best practices, Basic knowledge of AWS and cloud architecture 📃 Skills: JavaScript, Node.js, Express, React, PostgreSQL, REST, Microservices, DistributedSystems, Jest, Mocha, Git, Webpack, Rollup, AWS, SQL, Async/Await, Promises 🏢 Description: Full Stack JavaScript Developer (Node.js / React) About CRIF CRIF is an international company providing credit and business information services, data processing, and advanced decisioning solutions. We support financial institutions, insurers, utilities, and enterprises with reliable data, analytics, and secure, scalable technology platforms. WBO (White Blue Ocean) is CRIF’s personal and cyber security division focused on advanced monitoring of the Open and Dark Web. Using AI and machine learning, it identifies leaked, stolen, or exposed data and delivers proactive alerts for individuals and companies. Role Overview We are looking for an experienced Full Stack JavaScript Developer to join the WBO team and help build a complex data processing and analytics platform, covering backend services, frontend applications, and large-scale data pipelines. Key Responsibilities Design, develop, and maintain scalable backend services using Node.js Build modern, responsive web applications with React Develop and maintain RESTful APIs and microservices Implement and optimize data processing pipelines (ETL, streaming) Design and optimize PostgreSQL databases and complex queries Implement authentication and authorization mechanisms (JWT, ACL) Optimize application performance and data processing efficiency Write and maintain unit and integration tests Participate in code reviews and ensure high code quality Deploy and maintain applications in an AWS cloud environment Troubleshoot production issues and implement sustainable solutions Collaborate with the team on architecture and technical decisions Document technical solutions and API specifications Required Skills & Experience Strong experience with Node.js (v22+) and Express.js Solid knowledge of React (v16+) Experience with PostgreSQL and query optimization Very good understanding of asynchronous JavaScript (async/await, Promises) Experience designing scalable RESTful APIs Knowledge of microservices and distributed systems Familiarity with testing frameworks (Jest, Mocha) Experience working with Git and modern build tools (Webpack / Rollup) Understanding of web security best practices Basic knowledge of AWS and cloud architecture concepts Nice to Have Experience with AWS Lambda, S3, Athena, CloudWatch Docker and CI/CD pipelines (e.g. Jenkins) TypeScript, Redis, Bull, Socket.io Python or Rust for performance-critical components Experience working with and modernizing legacy systems What We Offer CONTRACT OF EMPLOYMENT Remote work model Work on large-scale, data-driven systems in an international environment Real impact on system architecture and technology decisions Modern tech stack and strong engineering culture Cooperation with experienced and supportive teams Competitive salary aligned with your experience (salary range will be shared during the first interview)

🏢 Summary: The offer is for a Java Developer role within an international development team working on credit and business information systems. The position involves designing and implementing new features across the full technology stack in a distributed, European environment. The role focuses on backend development with Java and Spring, with exposure to modern frontend and DevOps tools. 🗂️ Requirements: Minimum 2 years of commercial experience in Java development, Hands-on experience with Spring framework, Experience in building REST services, Ability to work in a distributed, international team, Communicative English (spoken and written) 📃 Skills: Java, Spring, REST, Oracle, MSSQL, Angular, React, Docker, Kubernetes, OpenShift, Jenkins, Maven, Git, SCRUM, JIRA, Azure 🏢 Description: Projects description: CRIF is an international company specializing in credit bureau and business information, outsourcing and processing services, and credit solutions. As a result of inventing new business lines as well as continuous support and expansion of existing services, CRIF is extending several development teams. The teams are located in Krakow and will cooperate with another development teams in Italy and Switzerland as well as several business stakeholders across Europe. TECHNOLOGY DETAILS: Technologies: Java 8+, Oracle/MS-SQL, Spring, Angular/React, Docker/Kubernetes/OpenShift Development environment: Jenkins, Maven, GIT Project management: SCRUM, JIRA RESPONSIBILITIES: Design and implement new features and change requests, involving the full technology stack Care for good software quality by following code style rules, refactoring and other well-known practices Maintain superb relations with colleagues inside and outside the team Communicate efficiently with colleagues in Kraków and other CRIF units on daily basis REQUIREMENTS: Proved record of 2+ years of experience at development of Java Hands-on experience with Spring and REST services Ability to work efficiently in a distributed, international team Communicative English, both spoken and written Additional asset would be: Knowledge of architectures of distributed systems Practical experience in GUI frameworks (Angular or React) Practical experience in CI/CD (Kubernetes, OpenShift, Jenkins) Practical experience in cloud-hosted systems (Azure) OUR OFFER: Very good, talented architects to learn from them Interesting business domain Work in international company with several business units in Europe, Asia and America A stable job in a fast growing environment Benefit package (private medical care, multisport, meal/restaurants discounts etc.) /for contract of employment Trainings & online conference package Language classes (English & German & Italian) Smart-working model hybrid Kraków - please note NO OPTION to work fully remotely

🏢 Summary: Development role focused on designing and implementing new features across the full Java-based technology stack in an international, distributed environment. The position involves building and maintaining high-quality backend services and collaborating with cross-functional teams using modern DevOps and Agile practices. Work is performed in a hybrid model within a growing European development structure. 🗂️ Requirements: 2+ years experience in Java development, Hands-on experience with Spring, Experience building REST services, Experience working with relational databases, Ability to work in distributed international team, Communicative English (spoken and written) 📃 Skills: Java, Spring, REST, Oracle, MSSQL, Angular, React, Docker, Kubernetes, OpenShift, Jenkins, Maven, Git, Azure, Scrum, JIRA 🏢 Description: Projects description: CRIF is an international company specializing in credit bureau and business information, outsourcing and processing services, and credit solutions. As a result of inventing new business lines as well as continuous support and expansion of existing services, CRIF is extending several development teams. The teams are located in Krakow and will cooperate with another development teams in Italy and Switzerland as well as several business stakeholders across Europe. TECHNOLOGY DETAILS: Technologies: Java 8+, Oracle/MS-SQL, Spring, Angular/React, Docker/Kubernetes/OpenShift Development environment: Jenkins, Maven, GIT Project management: SCRUM, JIRA RESPONSIBILITIES: Design and implement new features and change requests, involving the full technology stack Care for good software quality by following code style rules, refactoring and other well-known practices Maintain superb relations with colleagues inside and outside the team Communicate efficiently with colleagues in Kraków and other CRIF units on daily basis REQUIREMENTS: Proved record of 2+ years of experience at development of Java Hands-on experience with Spring and REST services Ability to work efficiently in a distributed, international team Communicative English, both spoken and written Additional asset would be: Knowledge of architectures of distributed systems Practical experience in GUI frameworks (Angular or React) Practical experience in CI/CD (Kubernetes, OpenShift, Jenkins) Practical experience in cloud-hosted systems (Azure) OUR OFFER: Very good, talented architects to learn from them Interesting business domain Work in international company with several business units in Europe, Asia and America A stable job in a fast growing environment Benefit package (private medical care, multisport, meal/restaurants discounts etc.) /for contract of employment Trainings & online conference package Language classes Smart-working model hybrid Kraków - please note NO OPTION to work fully remotely

🏢 Summary: The offer is for an IT Infrastructure/DevOps Engineer responsible for supporting development and production environments both on-premises and in the cloud. The role focuses on maintaining and automating infrastructure, managing CI/CD pipelines, and ensuring reliable operation of Kubernetes-based services. It involves close collaboration with international teams and supporting enterprise-scale systems. 🗂️ Requirements: Minimum 2 years of experience in similar role, Strong knowledge of Linux, Good knowledge of Bash, Experience with CI/CD/CT pipelines, Experience with Infrastructure as Code tools, Knowledge of Kubernetes (on-prem and cloud), Knowledge of Tomcat, Knowledge of Nginx or F5 load balancers, Experience with VMware, Good English skills 📃 Skills: Linux, Ubuntu, RedHat, Windows, VMware, AWS, Azure, Kubernetes, Docker, Git, Bash, Ansible, Terraform, CloudFormation, Tomcat, Nginx, F5, Python, DNS, VLAN, Routing, ActiveDirectory, ELK, SIEM, Prometheus, JIRA, Confluence 🏢 Description: CRIF is an international company specializing in credit bureau and business information, outsourcing and processing services, and credit solutions. Joining us, you will become a member of a company that is one of the key players worldwide providing integrated solutions for business & commercial information and credit management.  Nowadays more than 3,300 banks and financial institutions, 44,000 business clients, and 190,000 consumers use CRIF solutions in 50 countries on a daily basis. Technology stack used in Crif: Linux (Ubuntu, RedHat), Windows Server, VMware, AWS, Azure, K8s, Docker, Git Responsibilities: Support software development infrastructure Support production environment on prem and in the cloud Maintain superb relations with colleagues inside and outside the team Communicate efficiently with colleagues in Krakow and other CRIF units on daily basis. Requirements : Proved record of 2+ years of experience in a similar role Preferred higher education (IT, Engineering or similar) Strong knowledge of Linux Good knowledge of Bash and Unix command line toolkit (must have) Experience in CI/CD/CT pipelines implementation Infrastructure Automation: Configuration Management, Infrastructure as Code (e.g. Ansible, Terraform, AWS CloudFormation) Knowledge of on prem and cloud based Kubernetes services, Tomcat web service, Nginx/F5 load balancer/ VMware AVI Good English, both spoken and written. Good to have: Good knowledge in Python used for automation tasks Knowledge of infrastructure concepts (DNS, Network VLANs, Routing, Active Directory), preferable experience in maintenance of these areas, knowledge of Windows Server OS Monitoring, logging, and alerting tools (ELK, SIEM) Prometheus, JIRA, Confluence Our offer: Stable employment conditions based on an employment contract Very good, talented architects to learn from them A stable job in a fast-growing environment. Interesting business domain. Work in international company with several business units in Europe, Asia and America. Benefit package (private medical care, multisport) Health and life insurance Language classes (English) Trainings and learning budget Smart-working model Hybrid work mode (50/50), office in Krakow. If that sounds interesting, join us!

🏢 Summary: Senior Full Stack Developer role in a long-term banking transformation program focused on modernizing wholesale credit and lending platforms. The position involves enhancing risk and collateral systems, improving data governance, and contributing to core platform uplift within a global rollout. Hybrid work model with full-time B2B contract and technical interview process. 🗂️ Requirements: Strong experience in Java Full Stack development, Strong experience with PostgreSQL, Experience in data sourcing and transformation processes, Experience with data quality and governance improvements, Ability to perform code reviews, Experience working in fast-paced engineering teams, Fluent English for technical communication 📃 Skills: Java, PostgreSQL, SQL, Git, Claude, Quantexa 🏢 Description: 🌍Work mode: hybrid: 2x per week in the office in Kraków. ⏰Start: from June. 📝Contract: B2B. ⚙️Recruitment process: technical interview, live coding. ⏳Duration: >12 months contracts. 📕Project language: English. 💼Industry: Banking. 💻Workload: Full time. We are seeking high-performing Senior Full Stack Developers to join our Wholesale Credit & Lending Technology team. This pivotal role is integral to a major 3-4 year transformation program focusing on modernizing core credit and lending technology platforms across global markets. Main Responsibilities: Contribute to the uplift and refresh of wholesale credit and lending models. Support key risk and collateral management functions. Improve data quality, traceability, and governance. Review data sourcing, transformation, and consumption processes. Collaborate within a fast-paced engineering team. Key Requirements: Java Full Stack Development Strong experience with PostgreSQL (Postgres) Progressive engineering mindset Proven code review capability High attention to detail Pragmatic engineering approach Nice to Have: Exposure to Claude AI tooling Experience with Quantexa Other Details: This position requires office attendance 2 times per week and is part of a global-scale technology rollout. The urgency is high due to previous hiring challenges in fulfilling this critical transformation initiative.

🏢 Summary: Senior Full Stack Developer role in a long-term banking transformation program focused on modernizing wholesale credit and lending platforms. The position involves enhancing data quality, risk and collateral systems, and core credit models within a global engineering team. Hybrid work model with high-impact responsibilities in a multi-year technology rollout. 🗂️ Requirements: Strong experience in Java Full Stack development, Strong experience with PostgreSQL, Experience with data sourcing and transformation processes, Ability to perform code reviews, Experience working on credit or lending systems, Professional proficiency in English 📃 Skills: Java, PostgreSQL, SQL, FullStack, Git, REST, DataModeling, ETL 🏢 Description: 🌍Work mode: hybrid: 2x per week in the office in Kraków. ⏰Start: from June. 📝Contract: B2B. ⚙️Recruitment process: technical interview, live coding. ⏳Duration: >12 months contracts. 📕Project language: English. 💼Industry: Banking. 💻Workload: Full time. We are seeking high-performing Senior Full Stack Developers to join our Wholesale Credit & Lending Technology team. This pivotal role is integral to a major 3-4 year transformation program focusing on modernizing core credit and lending technology platforms across global markets. Main Responsibilities: Contribute to the uplift and refresh of wholesale credit and lending models. Support key risk and collateral management functions. Improve data quality, traceability, and governance. Review data sourcing, transformation, and consumption processes. Collaborate within a fast-paced engineering team. Key Requirements: Java Full Stack Development Strong experience with PostgreSQL (Postgres) Progressive engineering mindset Proven code review capability High attention to detail Pragmatic engineering approach Nice to Have: Exposure to Claude AI tooling Experience with Quantexa Other Details: This position requires office attendance 2 times per week and is part of a global-scale technology rollout. The urgency is high due to previous hiring challenges in fulfilling this critical transformation initiative.

🏢 Summary: Senior Full Stack Developer role in a long-term banking transformation program focused on modernizing wholesale credit and lending platforms. The position involves enhancing risk and collateral systems, improving data quality and governance, and contributing to core platform uplift. Full-time B2B contract with hybrid work model in Kraków. 🗂️ Requirements: Senior-level Java Full Stack development experience, Strong PostgreSQL experience, Experience with data sourcing, transformation and consumption processes, Ability to perform code reviews, Experience working in large-scale system modernization projects, Fluent English for technical communication 📃 Skills: Java, PostgreSQL, SQL, Git, REST, Claude, Quantexa 🏢 Description: 🌍Work mode: hybrid: 2x per week in the office in Kraków. ⏰Start: from June. 📝Contract: B2B. ⚙️Recruitment process: technical interview, live coding. ⏳Duration: >12 months contracts. 📕Project language: English. 💼Industry: Banking. 💻Workload: Full time. We are seeking high-performing Senior Full Stack Developers to join our Wholesale Credit & Lending Technology team. This pivotal role is integral to a major 3-4 year transformation program focusing on modernizing core credit and lending technology platforms across global markets. Main Responsibilities: Contribute to the uplift and refresh of wholesale credit and lending models. Support key risk and collateral management functions. Improve data quality, traceability, and governance. Review data sourcing, transformation, and consumption processes. Collaborate within a fast-paced engineering team. Key Requirements: Java Full Stack Development Strong experience with PostgreSQL (Postgres) Progressive engineering mindset Proven code review capability High attention to detail Pragmatic engineering approach Nice to Have: Exposure to Claude AI tooling Experience with Quantexa Other Details: This position requires office attendance 2 times per week (Cracow) and is part of a global-scale technology rollout. The urgency is high due to previous hiring challenges in fulfilling this critical transformation initiative.

🏢 Summary: B2B FullStack Developer role focused on building and enhancing a Client Onboarding platform for Global Banking and Markets using Java and React in a hybrid Kraków-based environment. The position involves developing REST APIs, working with microservices, improving system performance and security, and supporting production systems. Candidates will collaborate in a fast-paced DevOps-oriented team delivering innovative onboarding solutions. 🗂️ Requirements: Java 8+, React, Microservices, REST APIs, Testing, CI/CD, Debugging, Security awareness, Database schema design, PostgreSQL, DevOps, Problem-solving, Analytical skills, Collaborative environment experience 📃 Skills: Java, React, REST, Microservices, CI/CD, PostgreSQL, DevOps, Testing, Security 🏢 Description: As a FullStack Developer in our Kraków office, you will contribute to the development of a user-friendly Client Onboarding experience for Global Banking and Markets. This role emphasizes innovative thinking and a commitment to improving client experiences through technology. Work model: Hybrid (6 times per month work from office-Cracow) Business trips: n/a Start: ASAP/ one month notice period Assignment type: B2B Budget: 150-190 zł/h Main Responsibilities: Develop and maintain the Client Onboarding solution using Java and React. Debug existing code and extend functionality where necessary. Implement REST APIs in line with microservice architecture. Create and execute tests to ensure the reliability of functionalities and endpoints. Participate in performance and stability improvement initiatives. Contribute to security implementations around services and endpoints. Engage in production support as part of a rotating schedule. Key Requirements: Strong knowledge of Java 8+ / 18+ Proficient in React JS Ability to understand and debug existing code Experience with microservice architecture Experience with writing REST APIs Skill in writing tests to verify code functionality Familiarity with CI/CD tooling Strong security awareness in development practices Self-motivated with rapid learning capabilities Experience in a collaborative and fast-paced environment Strong problem-solving and analytical skills Good understanding of database schema design; knowledge of PostgreSQL is a plus Able to work in a DevOps environment Nice to Have: Familiar with DevOps practices Experience with cloud platforms Other Details: This position is based in Kraków, requiring hybrid work with meetings held online. The role involves substantial collaboration on innovative solutions aimed at enhancing the client onboarding process. Regular coding interviews will be conducted to assess coding skills.

🏢 Summary: Full Stack Developer role focused on migrating critical banking reporting systems to the cloud and building scalable web applications in a microservices architecture. The position combines Java and React development with cloud technologies to enhance data and reporting platforms. Work in an agile, cross-country team delivering secure, high-quality financial solutions. 🗂️ Requirements: 3+ years experience in large-scale full-stack web applications, Experience with microservices architecture, Proficiency in Java 17+, Strong knowledge of Spring and Spring Boot, Experience in RESTful API development, Expertise in ReactJS, Strong knowledge of JavaScript and TypeScript, Hands-on experience with Google Cloud Platform, Experience with relational databases or data warehouses, Experience with Git and SCM systems, Knowledge of CI/CD pipelines, Fluent English, Legal right to work in the EU 📃 Skills: Java, Spring, SpringBoot, REST, ReactJS, JavaScript, TypeScript, GCP, PostgreSQL, BigQuery, AlloyDB, Git, GitHub, Jenkins, Microservices, CI/CD 🏢 Description: Unleash innovation at the intersection of cloud, data, and full-stack development — shape the future of banking technology! Krakow-based opportunity with hybrid work model (up to 3 days remote per week). As a Java & React Full Stack Developer , you will be working for our client, a leading global financial institution, supporting the transformation of their data and reporting systems within the International Wealth & Premier Banking division. You will be instrumental in migrating critical reporting platforms to the cloud and developing scalable, web-based applications that enhance decision-making and operational efficiency. Join a dynamic team committed to technological excellence and career growth in the finance sector. Your main responsibilities: Independently design, develop, test, and deploy web applications in a collaborative, cross-country environment. Support the migration of existing reporting systems to cloud-based platforms, ensuring seamless transition and minimal disruption. Mentor and guide team members, facilitating knowledge transfer and best practices for technology stack evolution. Ensure development adherence to IT methodologies, security standards, and documentation requirements. Work in an agile environment to deliver high-quality features aligned with client needs. You're ideal for this role if you have: 3+ years of experience in delivering large-scale full-stack web applications with microservice architecture. Strong proficiency in Java (Java 17+ preferred), Spring/Spring Boot, and RESTful API development. Expertise in ReactJS, JavaScript, and TypeScript. Hands-on experience with Google Cloud Platform products. Working knowledge of relational databases/data warehouses such as PostgreSQL, BigQuery, or AlloyDB. Experience with Git and SCM systems like GitHub. Knowledge of data visualization tools (e.g., Apache ECharts) is an advantage. Understanding of CI/CD pipelines, particularly Jenkins. It is a strong plus if you have: Certifications or experience in cloud architecture or DevOps practices. Language Required for the role: Fluent English communication skills are essential. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: FullStack Developer role focused on building and enhancing a digital onboarding platform for Global Banking and Markets. The position involves developing scalable Java backend services and React-based user interfaces within a microservices architecture. The project emphasizes automation, security, performance, and DevOps-driven delivery in a hybrid work model. 🗂️ Requirements: Strong knowledge of Java 8+ / 18+, Proficiency in React JS, Experience with microservices architecture, Ability to write and maintain REST APIs, Experience with CI/CD tools, Experience debugging and extending existing code, Knowledge of database schema design, Understanding of DevOps practices and production support, Focus on application and service security 📃 Skills: Java, React, REST, Microservices, CI/CD, PostgreSQL, DevOps, SQL 🏢 Description: Location : Cracow Mode : hybrid (6x per month) Contract : B2B Rate : 170-190 PLN/h We are seeking a FullStack Developer to join our team working on our client’s onboarding solution. This role focuses on building the next generation of digital platforms for Global Banking and Markets, enhancing the onboarding experience for Corporates and Institutions. The ideal candidate will utilize their expertise to simplify the onboarding process, improving client experience and retention. This project embraces the latest technologies and encourages innovative thinking for automating tasks, learning new solutions, and maintaining a customer-first approach. Main Responsibilities: Develop and maintain high-quality, scalable Java applications. Implement and optimize React components for user-friendly interfaces. Debug existing code and extend functionality as needed. Write REST APIs and understand micro service architectures. Create and execute tests to validate functionalities and endpoints. Utilize CI-CD tools for seamless deployment and operations. Prioritize security in all service implementations. Contribute to performance and stability improvements of the platform. Engage in production support on a rotational basis within a DevOps POD. Collaborate in a fast-paced, innovative environment. Key Requirements: Strong knowledge of Java 8+ / 18+ Proficient in React JS Experience debugging and extending existing code Understanding of micro service architecture Capability to write REST APIs Experience with CI-CD tools Focus on security for functionalities and services Self-motivated with rapid learning capability Experience in a collaborative, fast-paced environment Problem-solving and analytical skills Good knowledge of database schema design, PostgreSQL is a plus Aware of DevOps practices and production support