Leading organization within the energy sector, is seeking a Senior PHP Backend Engineer to join an enterprise environment responsible for designing and delivering robust backend services and APIs. The role operates under a strict architecture-first model, where backend frameworks such as Symfony or Laravel are used as implementation tools, while all systems must conform to a standardized enterprise architecture, domain model structure, and engineering governance framework. The focus is on system design consistency, scalability, reliability, and long-term maintainability rather than framework preference. Core Engineering Principle All backend development adheres to a framework-agnostic enterprise architecture standard where: • Business logic remains independent of framework implementation • Symfony or Laravel are used primarily as delivery layers • Domain modeling, services, and application logic follow unified engineering patterns • Consistency and maintainability take precedence over framework-specific conventions Key Responsibilities • Design and develop backend services and APIs using Symfony or Laravel under a unified architecture standard • Implement business logic following Domain-Driven Design (DDD) principles, including bounded contexts, services, and entities • Build and maintain asynchronous workflows using queues, events, and message-driven architectures • Design and implement webhook-based and event-driven integrations • Collaborate with cross-functional teams within a standardized engineering delivery model • Participate in the full software development lifecycle, including architecture, development, testing, deployment, and support • Ensure system performance, reliability, scalability, and security • Contribute to architectural governance, engineering standards, and code quality initiatives Enterprise Architecture Expectations All engineers are expected to: • Separate domain logic from framework implementation • Follow standardized service and layer boundaries: Domain Layer (business logic) Application Layer (use cases) Infrastructure Layer (framework, ORM, and external systems) • Avoid framework-specific business logic leakage • Maintain consistent API design standards across services • Ensure testability independent of framework constraints Requirements • Minimum 4 years of professional backend PHP development experience • Strong PHP 8.2+ experience • Proven experience with Symfony or Laravel in production environments (minimum two projects) • Ability to work within a strict enterprise architecture standard independent of framework choice • Strong understanding of: Domain-Driven Design (DDD) Clean Architecture / Layered Architecture SOLID principles Object-oriented design patterns • Experience with: Symfony (DI Container, Messenger, Doctrine ORM) OR Laravel (Service Container, Queues, Eloquent ORM) • Strong MySQL expertise, including schema design, indexing, and query optimization • Experience designing and consuming RESTful APIs • Strong experience with asynchronous processing, queues, workers, and event systems • Experience with PHPUnit or Pest and a disciplined testing approach (unit and integration testing) • Experience with Git workflows and CI/CD pipelines • Experience working with Docker-based development environments • Bachelor's degree in Computer Science, Engineering, Information Technology, or a related field Nice to Have • Cloud experience (GCP preferred, AWS or Azure also considered) • Static analysis and quality enforcement tools such as PHPStan, Rector, Pint, or CS Fixer • Enterprise integrations (SAP S/4HANA, Salesforce, etc.) • Payment systems integration (Stripe or similar) • OAuth2 / SSO implementations • Exposure to frontend technologies such as Vue, React, or Angular • Experience in regulated or mission-critical environments such as energy, finance, or telecommunications Benefits • Gross monthly salary of €3,500–€4,000, subject to experience and technical expertise • Hybrid working model • Collaborative and professional engineering environment with strong technical standards • Continuous learning and professional development opportunities • Long-term career growth within a technology-driven organization To qualify as a candidate you must comply to the below criteria Eligibility to work within the EU without a sponsored visa Fluency in Greek and English ABOUT US: Founded in 2018, HumanI is an Executive Search firm, satisfying the needs of organizations for C-level, Senior and Middle positions, or specialised projects in the Engineering and Software functions. In parallel, through our partnerships we support HR Digital Transformation initiatives and build data analytics to facilitate informed decision making. Our competitive advantage stems from the collaboration of diversified people with backgrounds in HR, Psychology, Coaching, IT and Finance. Our brand “HumanI”, stands for Human Intelligence, encompassing our belief that no matter how multifaceted, digitally advanced or artificially intelligent a system may seem, it will always be a creation of 𝗛𝘂𝗺𝗮𝗻𝘀. This human aspect and ethical part of our work makes us unique in what we do. Ethical Headhunting; treating our candidates as our true clients, investing time and effort, consulting them on their careers. Supporting our companies as genuine strategic partners, investing in understanding their own internal needs and market trends. Each person is 𝗨𝗡𝗜𝗤𝗨𝗘 to us. After all, talent resides in deviations; embracing it, is the only way forward.