Senior PHP/Symfony Developer

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.