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 Smile: Why Join Us? 😊

Passionate about tech, digital, and innovation? Join the 1,800 employees at Smile, the European leader in open-source integration, spread across 20 agencies in 9 countries. Collaborative spirit and knowledge sharing are at the heart of our DNA. Our experts push the boundaries of open source every day to build a smarter, more efficient, and more responsible digital world. 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: Because the digital sector is in constant motion, 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.

Role Overview

On behalf of our fast-growing division, we are looking for API/SOA Developers at different seniority levels (Junior, Medior, and Senior) to join our consultant pool in Brussels.

In this role, you will be key to developing, securing, and maintaining modern API and Service-Oriented Architectures (SOA). Working on behalf of our premier client in Brussels, you will build clean, secure integrations and play a central part in bridging legacy systems with modern cloud infrastructure.

Key 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.

Your Profile

• 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.