Backend developer

• Mission Overview:

Keystone Solutions is hiring a Senior Back-end Developer to join our consultancy team and deliver a mission for our client in Brussels. As a Keystone Solutions consultant, you will work closely with the client's product and platform teams, contributing hands-on to back-end services built on modern .NET and Azure, while benefiting from Keystone's community, coaching, and project diversity. This engagement requires on-site presence at the client location at least 2 days per week.

About Keystone Solutions' Consultancy Model:

As a Keystone Solutions consultant, you are employed by Keystone and embedded within our client's squads to design, build, and operate solutions on-site and remotely. You collaborate with client stakeholders while being supported by Keystone mentors, practice leads, and a strong internal knowledge network. Over time, you may rotate across projects and industries, gaining breadth without sacrificing depth.

Key Responsibilities:

• 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 relational databases, key-value stores, blob/object stores, and similar technologies
• 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 the responsibilities above will be performed on the client project as a Keystone Solutions consultant.

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)

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

What You Will Gain as a Keystone Solutions Consultant:

• Consultancy nature of work: You will be a Keystone Solutions consultant embedded with the client's teams, combining on-site