.NET Developer

Keystone Solutions; Brussel; Sur place; EUR 90 000 - 130 000; Plein temps

Résumé du poste

Keystone Solutions is seeking a senior Back-end Developer consultant to deliver end-to-end .NET solutions, with strong Azure and DevOps expertise. You will work on-site in Brussels at least 2 days per week and collaborate with client engineering teams to implement scalable RESTful services and robust cloud deployments.

The role emphasizes advanced .NET mastery, modern practices like microservices and CI/CD with blue/green deployment, and active participation in DevOps transformation within the

Qualifications

• Minimum 10 years of professional experience in .NET development.
• Minimum 5 years of hands-on experience with Microsoft Azure in a professional context.
• Minimum 5 years of experience in DevOps practices, including CI/CD pipelines and deployment strategies such as blue/green deployment.
• Fluent in English (spoken and written), at least level B2.
• Willing to work on-site at least 2 days per week (Brussels).

Responsabilités

• Translate application storyboards and use cases into a functional application.
• Design, build, and maintain efficient, reusable, and reliable code.
• Integrate data storage solutions (databases, key-value stores, blob stores, etc.).
• Ensure best possible performance, quality, and responsiveness of applications.
• Identify bottlenecks and bugs and devise solutions.
• Help maintain code quality, organization, and automation.
• Collaborate with central teams to enhance DEVOPS capabilities.

Connaissances

.NET development

Microsoft Azure

DevOps

REST API

CI/CD

Blue/Green deployment

English (B2)

Outils

Jira

Confluence

Description du poste

Mission Overview:

Join Keystone Solutions as a Back-end Developer consultant to deliver impactful solutions for our client. This consultancy mission places you at the heart of the client?s engineering efforts while benefiting from Keystone Solutions? community, coaching, and growth pathways. As a Keystone Solutions consultant, you will execute the full scope of responsibilities and requirements described below while collaborating closely with the client?s teams.

Consultancy Model and Working Environment:

As a Keystone Solutions consultant, you will operate in a consultancy framework, combining on-site collaboration at the client?s location with remote work when applicable. You will work on-site in Brussels at least 2 days per week, integrate with the client?s engineering stakeholders, and deliver end-to-end outcomes under Keystone Solutions? delivery standards and values.

Key Responsibilities:

• Translate application storyboards and use cases into a functional application.
• Design, build, and maintain efficient, reusable, and reliable code.
• Integrate data storage solutions, which may include databases, key-value stores, blob stores, and more.
• Ensure the best possible performance, quality, and responsiveness of applications.
• Identify bottlenecks and bugs, and devise solutions to mitigate and address these issues.
• Help maintain code quality, organization, and automatization.
• Work with central teams to enhance the DEVOPS capability of the development teams.

All responsibilities will be carried out under Keystone Solutions? consultancy model, embedded with the client?s teams.

Conformity Criteria:

• Minimum 10 years of professional experience in .NET development, demonstrated in the CV, including recent experience with .NET Core/.NET 8-10 or equivalent versions and REST API development.
• Minimum 5 years of hands-on experience with Microsoft Azure in a professional context.
• Minimum 5 years of experience in DevOps practices, including CI/CD pipelines (e.g. YAML), and deployment strategies such as blue/green deployment.
• You communicate fluently in English (spoken and written), at least level B2.
• Willing to work on-site at least 2 days per week (Brussels).

These criteria are required for successful delivery as a Keystone Solutions consultant in partnership with the client.

Evaluation Criteria:

For each evaluation criterion, the expectation is that your CV clearly demonstrates relevant experience or knowledge through one or more examples/projects. The more relevant experience or knowledge you can provide as evidence, the better your CV will be evaluated.

• Depth and relevance of experience with Microsoft Azure
• Scope of services used (e.g. Event Hub, Cosmos DB, Functions, etc.)
• Level of responsibility and role
• Complexity of projects
• Level of expertise in .NET development
• Experience with modern .NET practices (e.g. microservices architecture, feature flags, clean architecture)
• Role and responsibilities in previous projects
• Experience with software architecture
• Application of design patterns and microservices architecture in previous projects
• Scope and impact of implemented solutions
• Experience with databases
• Practical experience with SQL and NoSQL databases
• Context of usage (transactional systems, distributed systems, etc.)
• Experience with testing practices
• Implementation of unit testing (tools, frameworks, coverage context)
• Experience with version control tools
• Practical use of Git in collaborative environments
• Experience with development and collaboration tools
• Use of Atlassian suite (Jira, Confluence, etc.)
• Context of usage (Agile delivery, DevOps processes)
• Experience with Agile methodologies
• Type of methodologies used (Scrum, SAFe, etc.)
• Role and level of involvement
• Continuous learning and innovation (reformulation of soft skill)
• Evidence of adoption of new technologies or frameworks in previous projects
• Participation in innovation initiatives or modernisation efforts
• Front-end experience
• Experience with React.js in professional projects
• AI IDE experience (bonus)
• Relevance experience in development with AI

Dynamic Projects Across Clients:

As a Keystone Solutions consultant, you will have the opportunity to contribute to diverse back-end and cloud challenges across multiple client engagements. This includes building RESTful services, integrating with various Azure services, optimizing performance, and enabling DevOps excellence in different contexts and team setups.

Turbo-Charged Learning and Development:

Keystone Solutions supports your professional growth through coaching, peer communities, and exposure to modern engineering practices such as microservices, clean architecture, CI/CD automation, and resilient cloud-native patterns. You will continuously sharpen your skills while delivering tangible value for the client.

Ambition Skyrocketing within a Consultancy Framework:

We foster career progression through varied client missions, increasing responsibilities, and architecture-minded initiatives. Your impact scales with each engagement as you take ownership of delivery quality, mentor peers, and help evolve DevOps capabilities in collaboration with central teams.

Keystone Solutions? Values in Action:

Being a K-Stone means you bring craftsmanship, ownership, integrity, and client empathy to every project. You will uphold engineering excellence, transparent communication, and a pragmatic, delivery-first mindset while representing Keystone Solutions on-site with the client.

Role-Specific Consultancy Impact (Back-end .NET, Azure, DevOps):

Apply your deep .NET expertise, hands-on Azure experience, and DevOps discipline to design reliable APIs, integrate storage solutions, enforce code quality and test coverage, and drive continuous delivery. Your contributions will directly enhance application performance, observability, and developer productivity within the client?s ecosystem.

Location and On-site Expectation:

Brussels, with on-site presence at least 2 days per week at the client?s office, operating under Keystone Solutions? consultancy framework.