API/SOA Developer (Freelance)

About the Position

API/SOA Developer (Freelance)

Location: Brussels, Belgium (Hybrid: 2-3 days remote per week)

Contract Type: Freelance (Prestation de services)

Levels & Experience Required: Junior (1 year exp.) | Medior (3 years exp.) | Senior (10 years exp.)

Language Requirements: Fluent in English (3/4) OR fluent in Dutch/French (3/4)

About the Company

Join Smile, the European leader in open-source integration, spread across 20 agencies in 9 countries. Passionate about tech, digital, and innovation? Here, we don't just follow trends, we create them! 🌟 Join Smile in Brussels and take part in projects that truly matter! 🏆

• Peer-to-Peer Management: Our proximity management by peers fosters dialogue and the implementation of a tailored career path.
• Continuous Learning: Smile is committed to making you an expert in your field, thanks to a comprehensive training offer: access to an e-learning platform, financing of certifications, and robust knowledge-sharing tools.
• Vibrant Community: Your year will be animated by group and agency events: annual convention, participation in trade fairs, summer party, and plenty of formal & informal afterworks.

Responsibilities

Depending on your level of seniority, your responsibilities will include:

• API & SOA Development: Developing high-quality backend APIs and services using Java within SOA, REST, and event-driven architectures.
• API Management & Integration: Implementing and configuring integration points across enterprise platforms such as Axway, Apigee, or WSO2.
• Security & Vulnerability Management: Incorporating robust security standards (OAuth2, JWT, SOAP security) and securing code using tools like Snyk and PKI (Public Key Infrastructure).
• Cloud & CI/CD Pipelines: Deploying and managing applications within Public Cloud environments, actively utilizing Git and automation-driven CI/CD pipelines.
• Testing & Quality Assurance: Conducting thorough automated testing of web services to ensure system stability, resilience, and high performance.
• Agile Collaboration: Working within an Agile/Scrum framework, using Jira and Confluence for documentation, tracking, and sprint activities.

Requirements

• Experience:
  • Junior: ~1 year of experience in backend/API development.
  • Medior: ~3 years of solid experience in API & middleware development.
  • Senior: 10+ years of deep expertise in complex enterprise integration and software development.
• Core Technical Skills:
  • Proficient in Java development applied to APIs.
  • Strong knowledge of API/Web Service standards and protocols (OAuth2, JWT, SOAP).
  • Hands-on experience with API Gateway / ESB platforms such as Axway, Apigee, or WSO2.
  • Familiarity with Event-Driven Architecture and public cloud concepts.
  • Solid understanding of security tools and practices (Snyk, PKI).
  • Experience with Git, CI/CD workflows, and web services testing frameworks.
• Methodology: Comfortable working in Agile/Scrum squads with tools like Jira and Confluence.
• Languages: Working proficiency (minimum 3/4) in English OR French/Dutch.

The Recruitment Steps 🚀

1. First Contact: A phone call to discuss your aspirations and what we can offer you.
2. Meeting: An opportunity to get to know each other and explore your professional background.
3. Business Interview: A discussion with one of our experts to assess your skills and define your goals.

We Offer

• Hybrid Work Environment: Flexibility to work remotely and in-office.
• Professional Growth: Comprehensive training and certification opportunities.
• Collaborative Culture: Engaging community with various events and activities.

Contact:

Sofia DANHIEZ

Talent Acquisition Specialist – Smile