Full Stack Web and Mobile Developer

Keystone Solutions

Brussel Hoofdstad

On-site

EUR 65,000 - 95,000

Full time

2 days ago

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Job summary

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

You will maintain architecture, translate requirements into robust designs, contribute to development, and ensure code quality across web and mobile applications. The position is full-time for four months with a focus on delivering reliable software solutions.

Qualifications

6+ years of software development experience.
Experience with full-stack web and mobile development.
Ability to translate business requirements into technical designs.

Responsibilities

Maintain the technical architecture of software solutions.
Collaborate with the team to translate requirements into robust designs and technology choices.
Contribute to software development, especially for complex components.
Ensure code quality and architectural consistency via reviews and standards.
Participate in design, development, testing, and delivery of software solutions.
Develop and maintain mobile applications.
Support testing, release, and deployment to stores.

Skills

C# / .NET

ASP.NET Core

React Native

Vue.js

Nuxt.js

Docker

Kubernetes

Azure DevOps

OpenID Connect

IdentityServer

REST API

jQuery/JS

NUnit

xUnit

Expo

Firebase/Expo

SQL Server

Tools

Docker

Kubernetes

Azure DevOps

Git

Job description

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.

Duration

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

Skills required