API Integration & Support Engineer

We're looking for an API Integration & Support Engineer to help accelerate the adoption of our client's API products across Corporate and Institutional clients, among others. The ideal candidate will work with internal teams to deliver first-class technical support during API onboarding and integration.

Your responsibilities

• Customer API integration support: Guide clients through onboarding and integration, act as the main technical contact on APIs, explain API capabilities, and support testing phases.
• Technical consulting and troubleshooting: Analyse integration issues, review API requests and responses, and recommend improvements.
• Product and sales support: Support the sales teams during pre-sales discussions and demonstrate API capabilities to clients.
• Project coordination: Track onboarding projects and manage dependencies and communication with stakeholders.
• Documentation and knowledge management: Maintain API documentation and build troubleshooting guides.

Your profile

• Education: Bachelor's degree in Computer Science, Software Engineering or a related field.
• Technical skills: Good knowledge of REST APIs and API testing tools, plus programming experience (Python, Java, etc.).
• Soft skills: Excellent customer-facing communication, rigorous organisation and attention to detail.
• Languages: Fluent English is essential. French is an asset.

Other details

• Location: Candidates must be based in Luxembourg or the Greater Region. Full remote and nearshore are not considered.
• Contract: 6-month freelance (T&M) assignment, starting at 2 days per week on average.
• Outlook: A permanent role may be considered at the end of the assignment, with no commitment at this stage.
• Relocation: A freelancer based abroad (e.g. Poland) can only be considered if they plan to relocate to Luxembourg or the Greater Region later.