5th Floor

5th floor is a Belgian company specializing in software development and IT modernization for the public sector. Since 2017, we have supported major Belgian public institutions, such as ONE, SPW, and ONEM, in designing, building, and implementing their digital solutions. Our 120+ consultants address IT and organizational challenges faced by government agencies, with close collaboration and visible results from the first sprints. Our services are organized around 3 complementary areas- Application Portfolio (L4F): we equip you to effectively govern your application portfolio. L4F identifies technical debt and risks, and makes investment decisions transparent up to senior management. Mapping, auditing, maintenance prioritization, knowledge transfer, and traceable documentation give you a consolidated view for informed decisions at every level- IT Projects: we design and develop scalable, maintainable applications structured around your business. Domain-Driven Design, resilient architecture, Team Topologies, CI/CD, and DevOps ensure fast, secure delivery. Example: a payment hub processing 30 million euros per month for the public sector, with regulatory compliance systematically enforced and a complete audit trail- Organizational Transition: we support the human side of change, where the real roadblocks often lie. Team coaching, facilitation, shared governance, and recognized frameworks such as Sociocracy 3.0 and Team Topologies help your teams gain autonomy and maturity. AI cuts across these three areas, integrated only when it brings tangible value, with strict attention to data security and privacy. We operate within a responsible framework, compliant with public sector requirements and the AI Act. Our method is based on co-creation, practiced daily with your teams and users. This approach delivers measurable impact where purely technical approaches fall short. 5th floor is B Corp certified since 2025. Contact: sales@5thfloor.be