Medior Full-Stack .NET Developer - JP054559

ITproposal • Dutch: C2 • French: C2 • 4-month contract • Bachelor's Degree • JavaScript • SQL • C# • 3 days ago

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Location

In office (Dessel)

Seniority

Junior · 2+ years exp

Confirmed on the employer's own hiring board on Oct 12, 2026. First seen by Alion on Oct 9, 2026.

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ITproposal

ITproposal is a Dutch IT services company headquartered in Amsterdam that provides service desk support, managed IT services, cybersecurity, cloud and network management, hardware and IT staffing to small businesses and enterprises. Founded in 2019 by Enes Bagci and Tunahan Gider, it serves more than 150 clients from offices in Amsterdam, Antwerp and Karaman, and places engineers on fixed-term assignments at client sites across Europe and beyond. Its job board lists contract roles such as Nutanix and networking support engineers in many countries, SAP Basis consultants, IAM engineers for SailPoint and other IT specialists in the Netherlands and Belgium.

itproposal.com • HQ: Amsterdam, Netherlands • IT Help Desk & Service Desk • IT Staffing & Staff Augmentation • Managed IT Services (MSP) • 501-1000 employees • Est. 2019

Medior Full-Stack .NET Developer

Location: Dessel, Belgium

Work Model: Onsite - No Remote

Employment Type: Full-time Contract

Duration: 4 months

Start Date: August 2026

Experience: 2-3 years

Job Overview

We are looking for a Medior Full-Stack .NET Developer to join a technical development team and contribute to the development, implementation, maintenance, and optimisation of secure and high-performing software applications.

The ideal candidate will have hands-on experience with .NET, React, microservices, SQL Server, Azure DevOps, and Git, and will be comfortable working in an Agile environment.

Key Responsibilities

Develop and maintain full-stack applications using .NET and React.
Perform functional and technical analyses based on business and user requirements.
Design solutions within a .NET and microservices architecture.
Contribute to technology and framework selection.
Develop and integrate APIs and microservices.
Work with Azure DevOps within an Agile development environment.
Use Git for source control and version management.
Perform unit and integration testing.
Apply application and API security best practices.
Monitor application performance, stability, and reliability.
Work with SQL Server for data management.
Support data integration within microservices environments.
Debug and resolve frontend and backend issues.
Provide second-line application support.
Proactively identify and prevent production issues.
Contribute to improvements in architecture and development practices.
Keep up to date with developments in the .NET and React ecosystems.
Document code, APIs, architecture, and technical solutions.
Share technical knowledge and best practices within the team.

Required Skills & Experience

Approximately 2-3 years of professional development experience.
Solid experience with .NET.
Hands-on experience with React.
Experience working with microservices.
Knowledge of SQL Server.
Experience with Azure DevOps.
Experience with Git.
Understanding of application and API security.
Experience with unit and integration testing.
Knowledge of Agile methodologies.
Experience with application monitoring, preferably Application Insights.
Experience with modern React state-management solutions such as Redux and/or Zustand.
Strong analytical and problem-solving skills.
Good communication and teamwork abilities.
Strong motivation, maturity, and willingness to learn.

Education

Bachelor's degree in Computer Science, IT, Software Engineering, or a related field, or equivalent professional experience.

Language

Dutch or French: Native or bilingual proficiency.

Additional Requirements

The position is fully onsite in Dessel, Belgium.
Candidates should be able to commute to the Dessel site on a daily basis.
A security clearance/authorisation or security screening may be required as part of the selection process.
Candidates should indicate whether they or their company already hold the required security clearance.

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