Full Stack Web and Mobile Developer

Mission Overview

Keystone Solutions is seeking a talented Full-Stack Web and Mobile Developer for a consultancy mission at a client site. This role requires a minimum of 6 years of experience in software development.

Responsibilities

• Maintain the technical architecture of software solutions.
• Collaborate with the technical team to translate business requirements into robust technical designs and appropriate technology choices.
• Actively contribute to software development, particularly for complex or critical components.
• Ensure code quality and architectural consistency through code reviews, technical standards, and best practices.
• Actively participate as a member of project teams, contributing directly to the design, development, testing, and delivery of software solutions.
• Develop and maintain mobile applications.
• Contribute to the testing, release, and deployment of mobile applications on the Google Play Store and Apple App Store.

Required Technical Skills

• Object-oriented programming, design patterns, n-tiers architecture.
• Backend: C#, .NET Framework 4.0/4.5/4.8, .NET Core, .NET Core WebApi, Entity Framework.
• Front end: HTML, CSS, JavaScript, jQuery, SCSS/SASS, Nuxt.js, Node.js, VueJs.
• Database: MS SQL Server, TSQL.
• DevOps and containerization: MS Azure DevOps, Git, Docker, Kubernetes.
• Mobile development: React Native, Expo, deployment (Google Play, App Store).
• Unit testing: NUnit, xUnit.
• IdentityServer, OpenId Connect and web applications security.
• Rest API services.

Soft Skills and Personal Competencies

• Ability to analyze complex problems, understand technical requirements, and identify appropriate solutions.
• Ability to work independently, take ownership of assigned tasks, and proactively identify areas for improvement.
• Strong teamwork skills and ability to work effectively with developers, designers, functional analysts, project managers, and other project stakeholders.
• Ability to communicate clearly and explain technical topics to colleagues.
• Ability to adapt to changing requirements, new technologies, and different development environments.
• Strong focus on code quality, reliability, usability, and maintainability across web and mobile applications.

Languages

• French or Dutch (read, written, spoken).
• English (read, written, spoken).

At Keystone Solutions, we pride ourselves on our consultancy nature, offering dynamic projects that provide turbo-charged learning opportunities and a commitment to skyrocketing ambition. Being a

Duration: 16/11/2026 - 26/02/2027 4 months • (full time)

Skills required

• Azure DevOpsConfirmed
• Azure DevOps (GIT)Confirmed
• C# / .NET (Core, 10)Confirmed
• C#: ASP.NET Core (REST API)Confirmed
• C#: ASP.NET MVCConfirmed
• DockerConfirmed
• ExpoConfirmed
• identity ServerConfirmed
• jQuery/JSConfirmed
• KubernetesConfirmed
• NUnitConfirmed
• NuxtConfirmed
• OpenID-ConnectsConfirmed
• React nativeConfirmed
• VueJSConfirmed
• xUnitConfirmed

Language requirements

French or Dutch (read, written, spoken)
English (read, written, spoken)
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