Senior Backend Developer (PHP)

Our client is a fast-growing fintech company transforming global payments. They build secure, high-performance solutions and integrate with top acquirers and gateways, offering engineers a chance to shape products and set new fintech standards.

Your Role and Impact

As a Senior Backend Developer, you will work on designing software from scratch, enhancing existing APIs, integrating third-party solutions, and supporting our payment ecosystem in production. This is a hands-on role where you will solve complex problems, improve performance, and shape the architecture of our platform.

Responsibilities

• Design, develop, test, document, release, and support backend software and APIs.
• Enhance and optimize existing systems to ensure scalability and reliability.
• Integrate third-party solutions (acquirers, gateways, alternative payment methods, scoring/monitoring systems, reporting tools, etc.).
• Debug and resolve issues, ensuring smooth operation of software in production.
• Create and maintain technical documentation.
• Collaborate with frontend developers and cross-functional teams to deliver high-quality solutions.
• Participate in the full SDLC, from requirements gathering to deployment and support.

Requirements

• Strong knowledge of PHP (OOP principles) and experience with Symfony (core framework).
• Hands-on experience with Doctrine ORM, PostgreSQL, SQL (CRUD operations, data manipulation).
• Deep understanding of security in PHP (SQL injections, XSS, CSRF, etc.).
• Experience with unit, integration, and functional testing (PHPUnit).
• Solid understanding of DDD, CQRS, Event Sourcing, SOLID principles, GoF design patterns, and Hexagonal Architecture.
• Experience with REST APIs, microservices, and event-driven systems.
• Familiarity with CI/CD processes, Docker, Kubernetes, and Jenkins.
• Strong troubleshooting skills and the ability to debug across different environments.
• Good understanding of Agile methodologies (Scrum/Kanban).

Nice to Have

• Experience with Redis, Elasticsearch.
• Experience with GitLab CI/CD.
• Knowledge of nginx, shell scripting.
• OpenAPI/Swagger documentation.
• Experience with TDD, UML.