We are looking for an experienced Senior PHP/Symfony Developer to support a marketing agency. This long-term contract opportunity is ideal for someone who can quickly strengthen application security, improve existing web platforms, and deliver dependable full-stack solutions in a fast-moving environment. The role calls for a self-directed developer who is comfortable balancing several initiatives while contributing high-quality code and modern development practices.

Responsibilities:

• Reinforce the security posture of existing Symfony-based applications by improving access controls, validating user input, and addressing known vulnerabilities.
• Design, build, and refine full-stack web features using PHP and Symfony, with careful attention to performance, maintainability, and secure architecture.
• Connect external services and APIs in a dependable manner, ensuring data exchange is protected and integrations are resilient.
• Manage work across multiple active assignments, adjusting priorities as needed while maintaining steady delivery timelines.
• Partner with technical team members during onboarding and ongoing development to align on standards, implementation plans, and code quality.
• Use AI-assisted development tools such as Codex, Claude Code, or similar platforms as part of the daily workflow to improve speed and efficiency.
• Produce clean, well-structured, production-ready code and contribute to upgrades that support increased project demand.
• Support frontend development efforts where needed, including work within modern JavaScript frameworks such as React.js.
• Investigate security-related issues and implement remediation measures that reduce risk across web applications.