API Integration Engineer (Electronic Cash Register)
First seen by Alion on Aug 24, 2026. Vivid Resourcing scores B on the Alion truth index.
For a payments customer, we are searching for a freelance API Integration Engineer to join the technical team in Brussel. You will support Electronic Cash Register (ECR) integrations. As an API Integration Engineer, your primary responsibility is to design, maintain, and optimize integrations with external clients, with a specific focus on ECR API integration at the protocol level (VIC, CTEP).
This role requires a blend of technical expertise, strong communication skills, and problem-solving ability. You will serve as a technical liaison between engineering teams and customers/partners, helping to troubleshoot and resolve integration issues, and to prevent them from arising in the future.
Responsibilities
- Provide technical support and hands-on integration assistance for ECR API Integration project
- Troubleshoot and resolve issues related to API connectivity and system interoperability
- Collaborate with development and QA teams to ensure robust integration solutions
- Monitor system performance and diagnose potential issues before they escalate
- Communicate effectively in English with clients and internal teams
- Manage project-related communications, deliverables, and status updates
- Use Jira for issue tracking and project management
Profile
- Good communication skills - fluent in Dutch or French and English
- Open-minded and flexible
- Strong technical background (HW/SW environment)
- Experience with API integrations
- Familiarity with Jira and agile project practices
- Ready to work in an international context
- Team player with a good level of autonomy
Additional Details
SENIORITY: 5+ Years
START DATE: September
DURATION: 6 Months
EXTENSION: Yes
CONTRACT: Freelance
LOCATION: Brussels
ONSITE POLICY: Flexible
HOURS PER WEEK: 40
LANGUAGES: Fluent English and Dutch/French
INTERVIEW PROCESS: 1-2 stages