At Shopflix, we are not just moving boxes; we are building the smartest marketplace in Greece. 

We are seeking a Principal PHP Engineer to lead the technical direction, architecture, and engineering standards of our PHP/Symfony ecosystem.

In this role, you will drive system design decisions, elevate code quality, mentor senior engineers, and partner with Product, Platform/DevOps, and Security to deliver scalable, resilient, and maintainable services. You will combine hands-on engineering with technical leadership, ensuring the organization consistently delivers high-quality software.

TECH: PHP 8.x, Symfony 5/6+, Composer, RabbitMQ, Redis, MySQL, REST/GraphQL APIs, Doctrine ORM, CI/CD pipelines, Docker, GitHub/GitLab, Monitoring/Tracing/Logging tooling

🧩 What You Will Do

• Architect and evolve backend systems built with PHP (8+) and Symfony, ensuring long-term maintainability and scalability.

• Design and optimize data and messaging layers using MySQL, Redis, and RabbitMQ (e.g., caching strategies, queue topology, message reliability, idempotency).

• Define and enforce architectural principles, design patterns, and engineering standards (SOLID, clean architecture, DDD where appropriate).

• Lead technical design reviews and provide guidance on system boundaries, service decomposition, and integration patterns.

• Drive code quality excellence through testing strategy, static analysis, coding standards, and meaningful code reviews.

• Own complex technical initiatives end-to-end (design, planning, delivery, readiness).

• Collaborate cross-functionally to ensure performance, reliability, and security.

• Mentor and coach engineers, raising the technical bar across teams.

• Identify and reduce technical debt; establish pragmatic modernization plans (framework upgrades, refactoring, dependency hygiene).

• Support incident prevention and response: observability, on-call readiness, postmortems, and continuous improvement.

• Sets a high bar for engineering quality and operational excellence.

• Makes pragmatic decisions balancing speed, quality, cost, and risk.

✅ Requirements

• 8+ years of professional software engineering experience, with deep specialization in PHP and backend systems.

• Strong, production-grade experience with Symfony (service container, HTTP lifecycle, Doctrine patterns, events, validation, security).

• Hands-on experience with RabbitMQ, including asynchronous processing patterns, retries/DLQs, message ordering considerations, and consumer scaling.

• Strong experience with Redis for caching, rate limiting, locks, queues/streams (as applicable), and performance optimization.

• Strong experience with MySQL, including schema design, indexing strategy, query optimization, transactions, and replication considerations.

• Demonstrated expertise in design patterns and their real-world tradeoffs (e.g., Strategy, Factory, Adapter, Repository, Specification, Decorator).

• Proven track record designing and delivering software architecture for complex systems (modular monoliths and/or microservices).

• Excellent communication skills: ability to write design docs, align stakeholders, and explain technical tradeoffs to mixed audiences.

🌟 Nice to Have

• Experience with DDD, CQRS, event-driven architecture, and distributed systems at scale.

• Performance tuning in PHP (profiling, OPcache tuning, memory optimization) and database performance at high throughput.

• CI/CD, Docker, Kubernetes, Terraform, and cloud platforms (AWS/GCP/Azure).

• Observability tooling (OpenTelemetry, Prometheus/Grafana, ELK/EFK, Datadog/New Relic).

• Security knowledge: OWASP, secure coding, authentication/authorization patterns (OAuth2/OIDC).

🎁 What We Offer

• Hybrid working model

• Competitive compensation package

• The opportunity to work in a high-traffic environment (millions of users) where your code impacts the Greek e-commerce market daily.

• A modern, agile work environment (Tribes & Chapters) with zero bureaucracy.

• Access to training programs and skill-development tools