Front End Developer React

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.

• 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.
• Manage and follow up on technical needs within front-end applications.
• Advise on technology choices (React, UI frameworks, tooling).
• Design solutions with a focus on user experience and front-end architecture.
• Translate functional needs into user-friendly interfaces.
• 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.
• Develop front-end applications using React.
• Work according to Agile methodology using Azure Dev Ops.
• Integrate front-end components with APIs and back-end services.
• Utilize Git for version control.
• 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.
• Perform unit and integration testing.
• Apply front-end security best practices.
• Ensure performance, accessibility, and user experience.
• Maintain qualitative and stable front-end components.
• 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.
• Work with data from APIs and back-end systems.
• Ensure correct processing and presentation of data.
• Support data integration within front-end applications.
• Analyze, resolve, and follow up on application or network-related issues to restore the operation of these applications or networks.
• Debug front-end issues.
• Provide second-line support.
• Proactively avoid production issues.
• Formulate proposals for renewal and optimization of the activity domain to meet current and future business needs.
• Propose improvements in front-end architecture and development practices.
• Keep up with developments within the React ecosystem.
• Promote usability, accessibility, and performance.
• 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.
• Document front-end components, guidelines, and architecture.
• Share knowledge within the team.
• Work according to structured documentation standards.

• React
• JavaScript / Type Script
• HTML5 & CSS3
• Responsive Design
• REST API integration
• Git
• Azure Dev Ops
• Agile working methodology
• Front-end & Integration testing
• Front-end security & accessibility best practices
• Experience with UX Design is a strong plus

• Medior profile (approximately 2–3 years of experience)
• Bachelor's degree or equivalent through experience
• Strong in maturity, drive, and team fit
• Strong focus on user experience and quality
• 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 at Keystone Solutions Career Portal.

Duration: 14/09/2026 - 31/12/2026 (4 months full time)

• Agile - Level: Intermediate
  - Most recent:
  This year
• Azure Dev Ops - Level: Intermediate
  - Most recent:
  This year
• CSS3 - Level: Intermediate
  - Most recent:
  Any time
• Frontend & Integration Testing - Level: Intermediate
  - Most recent:
  This year
• Frontend Security - Level: Intermediate
  - Most recent:
  This year
• GIT - Level: Intermediate
  - Most recent:
  This year
• HTML5 - Level: Intermediate
  - Most recent:
  Any time
• Java script - Level: Intermediate
  - Most recent:
  This year
• React - Level: Intermediate
  - Most recent:
  This year
• Responsive Design - Level: Intermediate
  - Most recent:
  Any time
• REST API integratie - Level: Intermediate
  - Most recent:
  Any time
• Type Script - Level: Intermediate
  - Most recent:
  Any time
• UX Design - Level: Intermediate
  - Most recent:
  This year

Dutch or French – Native or bilingual proficiency, English – Professional working proficiency.