Twenty8 is an independent firm delivering IT services to international organizations, with a focus on supporting digital transformation, business development, and customer-centric solutions.
We collaborate closely with European Union public institutions and agencies, helping skilled professionals navigate and grow in their international careers.
We are currently seeking a senior Senior PHP / Symfony Developer to design, develop and secure high-scalability backend applications while implementing DevSecOps best practices across the full software lifecycle for a prestigious European Institution in Brussels.
* Lead the migration and modernization of PHP/Symfony applications, integrating them with multiple CRMs and ensuring end-to-end development across backend, APIs (including API Platform) and cloud services;
* Design, develop and maintain secure, scalable cloud infrastructure with strong focus on reliability, security and performance optimisation;
* Implement and maintain DevSecOps practices, including platform security hardening, monitoring, compliance frameworks and proactive vulnerability management;
* Build and maintain database-driven systems and Symfony modules, refactoring legacy code, improving performance and developing new components, services and internal tools;
* Oversee system integrations, data pipelines and API connectivity (REST/JSON, API Platform), ensuring smooth communication between applications, devices and cloud-based architectures in high-scalability environments;
* (Optional when needed) Contribute to front-end development using React, ensuring modern, responsive and maintainable UI components;
* Strong expertise in PHP and Symfony, with ability to design, develop, integrate and maintain complex, scalable backend applications using Symfony Framework and API Platform;
* Solid knowledge of Web Security and DevSecOps practices, including secure coding, continuous integration, security monitoring, authentication/authorization (OAuth2, OpenID Connect) and data-protection principles;
* Proficiency in SQL/MySQL and relational database design;
* Familiarity with DevOps toolchains such as Git, Jenkins, Sonar, Nexus, JIRA/Confluence and cloud-based environments;
* University degree in Computer Science or relevant fields;
* Eligibility for Personal Security Clearance;
* Fluency in English (C1);
* Ability to work in multicultural and international settings.
This is a hybrid role, requiring on-site presence at the Brussels office 3 days per week.
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