Full Stack and Mobile Developer Technical Lead

Mission Overview

Keystone Solutions is seeking a Full-Stack and Mobile Developer / Technical Lead for a consultancy mission at a client site. This role requires strong technical expertise and a minimum of 8 years of experience in software development. As a consultant, you will be representing Keystone Solutions while working on dynamic projects that offer diverse challenges.

Responsibilities

• Define and maintain the technical architecture of software solutions, ensuring scalability, security, performance, and maintainability.
• 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.
• Provide technical guidance and support to developers, stimulate knowledge sharing and continuous improvement.
• Identify technical risks, dependencies, technical debt, and drive appropriate solutions.
• Collaborate with the head of service and project managers to ensure successful project delivery.
• 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

• Technical leadership: ability to guide and advise colleagues.
• Communication: ability to explain technical concepts and standards.
• Collaboration: strong teamwork and ability to work effectively with developers, project managers, and designers.
• Accountable: proactive approach in risks identification, take responsibilities.
• Continuous learning: willingness to learn new technologies, continuously improve technical skills.
• Knowledge sharing: ability to advise colleagues, share expertise.

Languages

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

At Keystone Solutions, we are committed to turbo-charged learning and skyrocketing ambition. Being a

Duration: 23/11/2026 - 26/02/2027 4 months • (full time)

Skills required

• Azure DevOpsConfirmé
• Azure DevOps (GIT)Confirmé
• C# / .NET (Core, 10)Confirmé
• C#: ASP.NET Core (REST API)Confirmé
• C#: ASP.NET MVCConfirmé
• DockerConfirmé
• ExpoConfirmé
• identity ServerConfirmé
• jQuery/JSConfirmé
• KubernetesConfirmé
• NUnitConfirmé
• NuxtConfirmé
• OpenID-ConnectsConfirmé
• React nativeConfirmé
• VueJSConfirmé
• xUnitConfirmé

Language requirements

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