Technical Lead, Full-Stack & Mobile Apps (Contract)

Keystone Solutions; Brussel Hoofdstad; On-site; EUR 92,000 - 148,000; Full time

Job summary

Keystone Solutions is seeking a senior Full-Stack and Mobile Developer / Technical Lead for a consultancy mission at a client site. You will define architecture, lead development, and ensure quality across mobile and web platforms.

You bring 8+ years of experience, strong communication and leadership skills, and are comfortable working at a client site in Belgium. Fluency in English, French or Dutch is expected, with a focus on delivering robust, scalable software solutions.

Qualifications

• 8+ years of software development experience, with hands-on senior technical leadership.
• Strong architecture, design patterns and multi-tier systems knowledge.
• Experience in .NET stack, frontend JS frameworks, and mobile tech.

Responsibilities

• Define and maintain software architecture for scalable, secure solutions.
• Translate business needs into robust technical designs and choices.
• Lead development and review code to ensure quality and consistency.
• Mentor developers and promote knowledge sharing and best practices.
• Identify risks, dependencies and debt; propose effective mitigations.
• Contribute to testing, release, and deployment of mobile apps.

Skills

Technical leadership

Architectural design

Backend development

Frontend development

Mobile development

React Native

Nuxt.js

Vue.js

C# / .NET

REST API

Unit testing

OpenID Connect

IdentityServer

Docker

Kubernetes

Azure DevOps

Git

JQuery/JS

Tools

Azure DevOps

Git

Docker

Kubernetes

Expo

React Native

Nuxt

OpenID Connect

Identity Server

NUnit

xUnit

jQuery

VueJS

Job description

Keystone Solutions is seeking a senior Full-Stack and Mobile Developer / Technical Lead for a consultancy mission at a client site. You will define architecture, lead development, and ensure quality across mobile and web platforms.

You bring 8+ years of experience, strong communication and leadership skills, and are comfortable working at a client site in Belgium. Fluency in English, French or Dutch is expected, with a focus on delivering robust, scalable software solutions.