Keystone Solutions
.NET Developer
Keystone SolutionsBelgium1 day ago
Full-timeEngineering, Information Technology
Mission Overview:

Keystone Solutions is seeking a Confirmed Back-End Developer to join us as a consultant on a mission at our client’s site. As a Keystone Solutions consultant, you will reinforce the client’s teams and contribute to the evolution of their core business applications, delivering high-quality back-end solutions while collaborating closely with the client’s stakeholders.

Consultancy Model at Keystone Solutions:

  • Consultancy nature of work: You will operate on-site at client locations as a Keystone Solutions consultant, embedded with the client’s team while supported by Keystone’s community of experts.
  • Dynamic projects: Tackle diverse technical challenges across various client environments, giving you exposure to multiple industries and architectures.
  • Turbo-charged learning and development: Access continuous learning, mentoring, and peer support from Keystone Solutions to broaden your skills and accelerate your growth.
  • Ambition skyrocketing within a consultancy framework: Build a high-impact career through varied client engagements, with clear pathways for advancement as a valued “K-Stone.”


Key Responsibilities:

  • Contribute to the evolution of the client’s core business applications as a back-end developer, reinforcing the client’s teams as a Keystone Solutions consultant.
  • Understand and work with UML models.
  • Know, use, and manage Microsoft SQL Server from versions 2016 to SQL Server 2025.
  • Know, use, and manage an Oracle database, version 19.
  • Apply design patterns based on the recommendations of the architect.
  • Develop REST services using .NET Framework and .NET 8+.
  • Develop interfaces in ASP.NET WebForms / MVC on .NET 4.5 and above.
  • Develop and integrate using XML and JSON.
  • Know and use W3C standards.
  • Know and use WebAPI, WCF REST, WCF, and Web Services.
  • Know and use Azure DevOps with Git and TFVC.
  • Use Entity Framework Core.
  • Leverage practical knowledge of Redgate tools (considered a plus).
  • Carry out all responsibilities under Keystone Solutions’ consultancy model, working closely with the client’s teams and processes.


Required Skills and Experience:

  • Role: Confirmed Back-End Developer (mandatory); most recent experience: this year.
  • .NET — Expert level; most recent experience: this year.
  • .NET Core — Expert level; most recent experience: this year.
  • Agile — Confirmed; most recent experience: any time.
  • ASP.NET — Confirmed; most recent experience: 1 to 3 years ago.
  • ASP.NET MVC — Confirmed; most recent experience: 1 to 3 years ago.
  • Azure DevOps — Confirmed; most recent experience: this year.
  • Git — Confirmed; most recent experience: 1 to 3 years ago.
  • JSON — Confirmed; most recent experience: this year.
  • RESTful API — Confirmed; most recent experience: 1 to 3 years ago.
  • Scrum — Confirmed; most recent experience: this year.
  • SOAP API — Nice to have; most recent experience: any time.
  • Visual Studio — Expert; most recent experience: 1 to 3 years ago.
  • XML — Confirmed; most recent experience: any time.
  • Understanding of UML models.
  • Proficiency with Microsoft SQL Server 2016 through SQL Server 2025.
  • Proficiency with Oracle Database, version 19.
  • Ability to apply design patterns as recommended by an architect.
  • Experience developing REST services in .NET Framework and .NET 8+.
  • Experience with ASP.NET WebForms / MVC on .NET 4.5 and above.
  • Fluency with XML and JSON.
  • Knowledge and use of W3C standards.
  • Knowledge and use of WebAPI, WCF REST, WCF, and Web Services.
  • Experience with Azure DevOps, including Git and TFVC.
  • Practical knowledge of Redgate tools (a plus).
  • Experience with Entity Framework Core.


Languages:

  • The service you will integrate is predominantly French-speaking; therefore, an excellent command of French is indispensable.
  • French — Native level.
  • English — Passive knowledge.
  • Dutch — Passive knowledge.


Work Location:

  • On-site at the client’s main address: Avenue de l'Astronomie, 14 - 1000 Bruxelles.


Keystone Solutions Values in a Consultancy Context:

  • As a K-Stone, you bring craftsmanship, ownership, curiosity, collaboration, and integrity to every client engagement.
  • We prioritize client impact, transparent communication, and high engineering standards in all consulting missions.
  • You will represent Keystone Solutions on-site, embodying our values while delivering measurable outcomes for the client.


Role-Specific Consultancy Advantages:

  • Apply your .NET back-end expertise across multiple client scenarios, from legacy modernization to cloud-first services and API ecosystems.
  • Gain breadth and depth by working with varied databases (SQL Server 2016–2025, Oracle 19), integration stacks (WebAPI, WCF, SOAP), and delivery pipelines (Azure DevOps with Git and TFVC).
  • Shape solutions in close collaboration with architects, translating design patterns into robust, scalable services in .NET Framework and .NET 8+.


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

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