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Keystone Solutions

IT System Infrastructure Engineer

On site

Brussels, Belgium

Full Time

20-01-2026

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Skills

Communication SQL Test Attention to detail Coaching Linux Windows SQL Server Azure cloud platforms Network Administration

Job Specifications

Mission Overview:

Keystone Solutions is seeking a Medior IT System Engineer to join our consultancy team. This is a consultancy mission delivered by Keystone Solutions at a client site, where you will work closely with the clients Internal System Infrastructure team and their external IT service provider. You will perform all responsibilities below as a Keystone Solutions consultant, embedded with the client.

Consultancy Model at Keystone Solutions:

As a Keystone Solutions consultant, you will operate on-site at the client (with hybrid collaboration where applicable), partnering with the clients teams and their external IT service provider. You will contribute to design, implementation, and secure operations under Keystones consultancy framework while benefiting from our community, coaching, and knowledge-sharing culture.

About the Client Environment:

The clients IT infrastructure is partially outsourced to an external IT service provider that handles the setup and day-to-day management. The clients Internal System Infrastructure team collaborates intensively with this service provider to set up and run the infrastructure and keep it secure. Important note: being a specialist in all solutions is not required as the day-to-day management is outsourced; a generalist mindset to glue all components together is.

Infrastructure You Will Co-Manage:

Network (firewall, switching)
Security components (web application firewall, anti-DDoS, web proxy)
Database (SQL Server)
Storage
Servers (Windows and Linux)
Cloud infrastructure (Azure)
Workstations (Windows)
Mobile devices (Apple iOS devices)

Responsibilities:

Help with design and set up new infrastructure or applications in a secure way
Collaborating with the clients applicative IT team, client business users and external service provider to implement the correct infrastructure for the business requirements and non-functional requirements like high availability and security
The day-to-day management of applicative issues together with other teams at the client or service provider in the most secure way
Troubleshooting and technical support in collaboration with colleagues and service provider
The handling and follow-up of security incidents
The documentation of information for IT people and end users
Providing the link with the first level and third level teams

Next to this team you will be mainly working close together with the external service provider, the client service desk, PC desk and the larger IT team that manages BI and application development of the clients business.

All of the above will be carried out as a Keystone Solutions consultant, working closely with the client under a consultancy model.

Specific Skills:

An IT background (and/or education) is mandatory
Security mindset
Investigational spirit (information will not always be preprocessed and ready to use)
Will to continuously improve
Documentation drafting (in English)
Other professional experiences in a similar IT function (server, storage, and network administration) is a plus
Practical knowledge of
Microsoft Windows Office tools (Word, Excel, Outlook, SharePoint)
General IT infrastructure

General Skills:

Team player
Highly motivated
Strong communication and interpersonal skills
Independent working
Very-well organized and structured
Attention to detail and ability to work in a fast-paced environment
Ability to manage multiple tasks and priorities effectively
Bilingual NL/FR and good level of EN (writing)

Technical Proficiencies (Expert Level):

Azure
Firewall
iOS
Linux
SQL Server
Storage
Switching
Windows

Languages (Platform Indicators):

Dutch or French: Nice to have
English: Nice to have

Keystone Solutions Advantages in a Consultancy Context:

Consultancy nature of work: Operate on-site at client locations as a Keystone Solutions consultant, embedded with stakeholders while backed by our expert community.
Dynamic projects: Tackle diverse technical challenges across infrastructures, security components, cloud platforms, and hybrid environments over the course of your consultancy journey.
Turbo-charged learning and development: Benefit from mentoring, peer reviews, internal labs, and support for certifications relevant to infrastructure, security, cloud, and automation.
Ambition skyrocketing: Accelerate your career through varied client engagements, clear growth paths, and opportunities to broaden or deepen your expertise.

Our Values in Every Consulting Engagement:

Excellence and craftsmanship: Deliver high-quality, secure, and reliable solutions that stand the test of real-world operations.
Integrity and ownership: Act with trust and accountability in every client interaction.
Curiosity and continuous improvement: Explore, learn, and iterate to raise the bar on outcomes.
Collaboration and knowledge sharing: Being a K-Stone means bringing these values to each client project and elevating the teams around you.

If you are ready to tackle technical and strategic challenges in a dy

About the Company

At Keystone Solutions, we specialize in bridging technology and talent to deliver a seamless IT experience. With a focus on efficiency and innovation, we streamline your IT services, ensuring that you can focus on what you do best while we handle the complexities of your IT ecosystem. From strategic planning through to execution, we are your partners in creating a harmonious technological environment that propels your business forward. Our Services: - Hyperautomation: Embrace efficiency with Keystone Solutions' hyperautom... Know more