Integration Engineer

Posted 3 days 7 hours ago by Apollo Solutions

Permanent
Not Specified
Other
Brussel, Brussel (Stad), Belgium
Job Description

We are seeking an experienced API Integration Engineer to support a core banking platform transformation for one of Belgium's most respected financial institutions.


This is a fantastic opportunity to join a forward-thinking digital engineering team, working on the integration of internal and external APIs to enable secure, scalable, and future-ready banking services.


If you're passionate about modern architecture, API lifecycle management, and delivering critical backend services at scale - this role could be the right fit.


Logistics:

  • Position: Freelance API Integration Engineer - Digital Core Banking
  • Duration: 12-month rolling contract (extensions highly likely)
  • Location: Brussels (Hybrid - 2 days on-site per week)
  • Day Rate: €(Competitive & Negotiable)
  • Languages: English (Dutch or French is a plus)
  • Interview Process: 2 stages with prompt feedback


Key Responsibilities:

  • Develop and maintain robust RESTful APIs to support banking applications and third-party integrations
  • Collaborate with architecture and security teams to define API standards, versioning, and governance
  • Work with product teams to understand requirements and translate them into scalable services
  • Monitor and improve API performance, reliability, and traceability
  • Integrate APIs across various backend systems and SaaS platforms using tools such as Apigee, MuleSoft, or Kong
  • Ensure full compliance with security protocols, authentication standards (OAuth2), and regulatory expectations (e.g. PSD2)


Ideal Candidate:

  • 5+ years of backend/API development experience in Java or Node.js
  • Strong expertise in REST API design, integration, and platform management
  • Familiarity with Kafka, OAuth2, OpenAPI/Swagger, and cloud-native tooling
  • Comfortable working with legacy systems and modern microservice architectures
  • Self-directed and confident in communicating directly with architects and technical leads
  • Able to thrive in a fast-paced team of experienced engineers with minimal handholding


Desirable:

  • Experience with enterprise service buses or API gateways (Apigee, MuleSoft, AWS API Gateway)
  • Previous exposure to the banking/financial sector or regulated environments
  • Understanding of event-driven patterns, data security, and compliance frameworks
  • Experience working in CI/CD environments with GitLab, Jenkins, or Azure DevOps


Why Join This Programme?

  • Business-Critical Work: Help enable secure, real-time banking capabilities across platforms
  • Modern Stack: Use the latest tech in cloud-native, scalable deployments
  • Experienced Team: Join a mature, outcome-driven engineering culture
  • Hybrid Flexibility: 2 days on-site with the rest remote
  • Attractive Rates: Competitive freelance compensation in line with experience


Sound like your kind of challenge?


Get in touch - early conversations are already underway.