.NET Developer

Join Keystone Solutions as a consultant for a .NET Developer mission at a client site. As a Keystone Solutions consultant, you will deliver high-impact solutions directly within the client environment while benefiting from our consultancy model, career development support, and dynamic project opportunities. You will perform all responsibilities and meet all requirements listed below while working closely with the client.

• →Translate application storyboards and use cases into 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.

• Minimum 10 years of professional experience in .NET development, demonstrated in the CV, including recent experience with .NET Core/.NET 8 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 (for example, YAML), and deployment strategies such as blue/green deployment.
• You communicate fluently in English (spoken and written), at least level B2.

• Depth and relevance of experience with Microsoft Azure
  • Scope of services used (for example, Event Hub, Cosmos DB, Functions, and others).
  • Level of responsibility and role.
  • Complexity of projects.
• Level of expertise in .NET development
  • Experience with modern .NET practices (for example, 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, and similar contexts).
• 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 the Atlassian suite (Jira, Confluence, and related tools).
  • Context of usage (Agile delivery, DevOps processes).
• Experience with Agile methodologies
  • Type of methodologies used (Scrum, SAFe, and others).
  • 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 (bonus)
  • Experience with React.js in professional projects.
• Sector experience (bonus)
  • Relevance of experience in the railway or mobility sector.
• Level of proficiency in Dutch and/or French
  • Level achieved (B2).
  • Ability to work in a professional context.

This is a consultancy mission delivered on-site at the client location as a Keystone Solutions consultant. You will integrate with the client's teams, align to their delivery processes, and execute the responsibilities above while backed by Keystone Solutions' coaching, peer community, and delivery standards.

As a Keystone Solutions consultant, you will have the opportunity to tackle diverse challenges across multiple client environments over time, applying modern .NET, Azure, and DevOps practices to complex, real-world systems.

Keystone Solutions supports your growth with continuous professional development, knowledge-sharing sessions, and access to a network of specialists. Expect hands-on learning in areas such as microservices, cloud-native architectures, CI/CD, and testing excellence.

Your career will accelerate through varied client engagements, increasing responsibility, and the chance to lead initiatives that enhance performance, quality, and DevOps maturity across projects.

Being a K-Stone means delivering with craftsmanship, ownership, and collaboration. We bring pragmatism, transparency, and continuous improvement to every client project, ensuring measurable impact while upholding engineering excellence.

As a senior .NET consultant, you will apply your expertise in .NET Core/.NET 8, REST API design, Azure services, and CI/CD at the client site, helping identify bottlenecks, elevating code quality, and guiding teams toward reliable, scalable, and performant applications across varied contexts.

• Operate within the client's Agile and DevOps processes while contributing Keystone Solutions best practices.
• Collaborate with central and cross-functional teams to enhance DevOps capabilities.
• Drive quality through unit testing, code reviews, and clean architecture approaches.
• Leverage Azure services and databases (SQL and NoSQL) to design resilient, cloud-ready solutions.

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.