Mission Overview:
We are seeking a Front-End Developer (React) for a consultancy mission at a client site representing Keystone Solutions. In this role, you will be responsible for developing, implementing, and maintaining user-friendly, high-performance, and secure front-end applications within a React environment to ensure a stable and modern user experience that optimally supports business processes and end-users.
Key Responsibilities:
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Contribute to the renewal of hardware and/or software components and perform necessary functional or technical analyses to meet the needs of end-users and the company.
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Manage and follow up on technical needs within front-end applications.
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Advise on technology choices (React, UI frameworks, tooling).
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Design solutions with a focus on user experience and front-end architecture.
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Translate functional needs into user-friendly interfaces.
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Develop or determine technical requirements for, as well as implement, new hardware or software and applications to provide a quality set of equipment and applications.
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Develop front-end applications using React.
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Work according to Agile methodology using Azure DevOps.
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Integrate front-end components with APIs and back-end services.
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Utilize Git for version control.
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Monitor, maintain, test, and secure the IT infrastructure and/or software applications to ensure a high degree of reliability, security, and usability for end-users.
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Perform unit and integration testing.
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Apply front-end security best practices.
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Ensure performance, accessibility, and user experience.
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Maintain qualitative and stable front-end components.
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Maintain data structures and/or system settings, providing a performant environment for data management and ensuring backups of user files to guarantee the correctness of business data and quick recovery in case of loss or damage.
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Work with data from APIs and back-end systems.
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Ensure correct processing and presentation of data.
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Support data integration within front-end applications.
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Analyze, resolve, and follow up on application or network-related issues to restore the operation of these applications or networks.
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Debug front-end issues.
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Provide second-line support.
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Proactively avoid production issues.
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Formulate proposals for renewal and optimization of the activity domain to meet current and future business needs.
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Propose improvements in front-end architecture and development practices.
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Keep up with developments within the React ecosystem.
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Promote usability, accessibility, and performance.
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Ensure knowledge retention and keep data and documentation up to date for your area of expertise, as well as communicate information to maintain a correct and complete picture of all available components and applications throughout their lifecycle.
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Document front-end components, guidelines, and architecture.
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Share knowledge within the team.
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Work according to structured documentation standards.
Technical Requirements:
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React
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JavaScript / TypeScript
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HTML5 & CSS3
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Responsive Design
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REST API integration
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Git
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Azure DevOps
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Agile working methodology
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Front-end & Integration testing
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Front-end security & accessibility best practices
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Experience with UX Design is a strong plus
Profile:
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Medior profile (approximately 2-3 years of experience)
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Bachelor's degree or equivalent through experience
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Strong in maturity, drive, and team fit
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Strong focus on user experience and quality
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Interest in modern front-end technologies and continuous improvement
If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today .
Duration: 14/09/2026 - 31/12/2026 4 months • (full time)
Skills required:
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Agile - Level: Intermediate - Most recent: This year
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Azure DevOps - Level: Intermediate - Most recent: This year
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CSS3 - Level: Intermediate - Most recent: Any time
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Frontend & Integration Testing - Level: Intermediate - Most recent: This year
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Frontend Security - Level: Intermediate - Most recent: This year
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GIT - Level: Intermediate - Most recent: This year
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HTML5 - Level: Intermediate - Most recent: Any time
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Javascript - Level: Intermediate - Most recent: This year
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React - Level: Intermediate - Most recent: This year
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Responsive Design - Level: Intermediate - Most recent: Any time
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REST API integratie - Level: Intermediate - Most recent: Any time
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TypeScript - Level: Intermediate - Most recent: Any time
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UX Design - Level: Intermediate - Most recent: This year
Language requirements:
Dutch or French
Level Native or bilingual proficiency
English
Level Professional working proficiency
