Full Stack .NET Developer Consultant

Keystone Solutions; Town of Belgium (WI); Hybrid; USD 90,000 - 130,000; Full time

Job summary

Keystone Solutions is seeking a mid-level Full Stack .NET Developer for a client-site consultancy. You will develop, implement, and maintain .NET-based applications, focusing on stability, security, and high performance to support business processes and user experience.

Responsibilities include API/microservices development, frontend React work, and SQL Server data management while adhering to Agile practices and continuous improvement.

Qualifications

• Medior profile with approximately 2–3 years of experience.
• Bachelor’s degree or equivalent through experience.
• Strong in maturity, drive, and team fit.

Responsibilities

• Develop full stack applications (.NET + React).
• Work according to Agile methodology using Azure DevOps.
• Design solutions focusing on frontend (React) and backend integration.
• Implement APIs and microservices.
• Ensure performance and stability.
• Maintain data structures and backups for data integrity.

Skills

Net

Agile

APIs

Application Insights

Azure DevOps

Git

Microservices

React

Redux

SQL Server

Unit testing

Zustand

Education

Bachelor’s degree or equivalent

Tools

Azure DevOps

Git

SQL Server

Job description

Mission Overview:

We are seeking a Full Stack .NET Developer for a consultancy mission at a client site, representing Keystone Solutions. The role involves developing, implementing, and maintaining software applications within a .NET environment to ensure a stable, high-performance, and secure IT environment that optimally supports business processes and user experience.

Key Responsibilities:

• 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 a .NET and microservices architecture.
• Advise on technology choices (.NET, React, tooling, frameworks).
• Design solutions focusing on frontend (React) and backend integration.
• 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 full stack applications (.NET + React).
• Work according to Agile methodology using Azure DevOps.
• Implement APIs and microservices.
• Use 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 user-friendliness for end-users.
• Perform unit and integration testing.
• Apply application & API security best practices.
• Ensure performance and stability.
• 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 SQL Server for data management.
• Monitor data quality and performance.
• Support data integration within microservices.
• Analyze, resolve, and follow up on application or network-related issues to restore the operation of these applications or networks.
• Debug frontend and backend 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 architecture and development practices.
• Keep up with developments within the .NET and React ecosystem.
• Ensure knowledge retention and keep data and documentation up to date for the own area of expertise, as well as communicate information to maintain a correct and complete view of all available components and applications throughout their lifecycle.
• Document code, APIs, and architecture.
• Share knowledge within the team.
• Work according to structured documentation standards.

Profile:

Medior profile (approximately 2-3 years of experience). Bachelor’s degree or equivalent through experience. Strong in maturity, drive, and team fit.

Why Join Keystone Solutions:

As a consultant at Keystone Solutions, you will engage in dynamic projects that offer diverse challenges across various client environments. You will experience turbo-charged learning opportunities and have the chance to skyrocket your ambition and career growth. Being a 'K-Stone' means bringing our core values to every engagement.

Duration:

As soon as possible - 31/12/2026 4 months • (full time)

Skills required:

• .Net - Level: Intermediate - Most recent: This year
• Agile werkmethodiek - Level: Intermediate - Most recent: This year
• Application & API security - Level: Intermediate - Most recent: This year
• Application Insights - Level: Intermediate - Most recent: This year
• Azure DevOps - Level: Intermediate - Most recent: This year
• GIT - Level: Intermediate - Most recent: This year
• Microservices - Level: Intermediate - Most recent: This year
• React - Level: Intermediate - Most recent: This year
• Redux - Level: Intermediate - Most recent: This year
• SQL Server - Level: Intermediate - Most recent: This year
• Unit & integration testing - Level: Intermediate - Most recent: This year
• Zustand - Level: Intermediate - Most recent: This year

Language requirements:

Dutch or French
Level Native or bilingual proficiency