We are looking for an engineer to work on rewriting an existing internal application and extending its functionality. The project focuses on tools for campaign and ad creation, media resource management, uploaders, and bulk action capabilities. The key goal is to build a highly usable and efficient interface.ResponsibilitiesCollaborate with product and design teams to build intuitive, user-friendly interfaces for internal campaign and media management toolsDevelop and maintain front-end features using ReactJS, TypeScript, and modern JavaScript (ES6+), ensuring performance and scalabilityDesign and implement RESTful APIs and/or GraphQL endpoints to support new functionality and integration with back-end servicesContribute to back-end development using Node.js and Express, including middleware creation for routing, authentication, and error handlingRequirementsExperience building consumer-facing web applications.Expert in HTML5, CSS, and JavaScript, with mastery of ReactJS, TypeScript and ES6Strong Node.js skills using frameworks like Express, including custom middleware development for authentication, routing, and error handlingProven ability to design and implement REST APIs and GraphQL endpointsWorking hours 8:00 am - 4:00 pm CESTExcellent written and verbal communication skills.Nice to haveExperience with automated testing using Jest and PlaywrightStrong UX/UI design understandingWe offerOpportunity to work on bleeding-edge projectsWork with a highly motivated and dedicated teamCompetitive salaryFlexible scheduleBenefits package - medical insurance, sportsCorporate social eventsProfessional development opportunitiesWell-equipped officeAbout UsGrid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.