Senior PHP Backend Engineer

What are we looking for:

We are looking for a Senior Backend Engineer (PHP) who loves solving complex problems, designing resilient systems, and building reliable services that handle real traffic at scale. If you thrive in distributed environments, care deeply about code quality, and enjoy working with event-driven architectures, you'll feel right at home at Fever.

You will work on the backend systems that power large-scale experiences, payments, reconciliation processes and high-traffic flows used by millions of users worldwide .

What would you do at Fever?

On your first month in Fever:

• Get fully onboarded into Fever's engineering culture, our architecture, and our technical stack (PHP 8, microservices, Docker, AWS, CI/CD).
• Work closely with your team in plannings, groomings and retrospectives.
• Make your first contributions to production systems with several PRs merged.
• Understand and interact with core services: authentication, payments, reconciliation, operational tools.
• Attend one of Fever's experiences like Candlelight .

After 3 months in Fever:

• Design and implement backend solutions end-to-end: from architecture to production-ready code.
• Develop and maintain high-performance PHP services and APIs following OpenAPI/Swagger contracts.
• Contribute to cross-team projects, architecture discussions and internal engineering initiatives.
• Own monitoring, performance, reliability and observability of the modules you work on (logs, metrics, tracing).
• Collaborate with infra, product, frontend and backend teams in a highly dynamic environment.

On your 6th month in Fever:

• Own and evolve critical parts of Fever's distributed system architecture.
• Lead the design and implementation of a new microservice from scratch to production.
• Drive improvements in scalability, resiliency, performance and code quality.
• Mentor teammates through code reviews, technical design sessions and pair programming.
• Join team buildings and engineering-wide activities.

Your responsibilities: 

• Design, build and maintain backend APIs and services for critical business domains (payments, reconciliation, fiscal automation, logistics).
• Work on high-concurrency systems focusing on stability, resiliency, and traceability.
• Integrate external services with complex and mission-critical logic.
• Participate actively in architectural decisions to ensure scalability and maintainability.
• Implement and improve CI/CD pipelines, automated testing and deployment workflows.
• Use Docker for local and production environments, and AWS services (SQS, Lambdas, CloudWatch, SNS, S3…) for distributed infrastructure.
• Promote engineering excellence through clean code, testing and continuous improvement.
• Collaborate in an agile, cross-functional squad with backend, infra, QA and product.

Must have skills:

• Robust experience building backend systems, especially using PHP 8+.
• Solid experience building and maintaining RESTful APIs at scale.
• Deep understanding of MySQL and PostgreSQL.
• Strong knowledge of microservices, distributed systems, concurrency and event-driven architectures.
• Experience with Docker, CI/CD pipelines and delivering software from dev to production.
• Good technical judgment: you know when to iterate fast and when to reinforce stability.
• Experience with testing and code quality tools (PHPUnit, PHPStan, SonarCloud).
• Excellent command of Git and collaborative development.
• Professional proficiency in English.

It would be a plus if you have experience in:

• Experience with AWS infrastructure (SQS, Lambdas, CloudWatch, ECS/EKS).
• Experience with Redis, caching strategies and message queues like Kafka or RabbitMQ.
• Familiarity with frameworks such as Symfony, Laravel or Slim.
• Observability tools (Datadog or similar).
• Experience handling services with 1,000+ requests/second.
• Background integrating critical external APIs (payments, financial systems).
• Experience working in agile, cross-functional international teams.
• Curiosity, creativity and a proactive mindset.

• Full-time employment ("Relación de dependencia").
• Competitive compensation.
• OSDE 410.
• English lessons.
• WelHub Membership.
• 40% discount on all Fever experiences.
• Remote-friendly work from anywhere in Argentina.
• Responsibility and impact from day one.
• A fast-growing global environment with international teammates.
• Team buildings and internal events.

Fever aims to provide a fast and transparent experience to our candidates:

1. Talent Interview (1h) – Intro to Fever, culture and your background.
2. Technical Assignment (3 days) – Your opportunity to showcase your skills.
3. Team Interview (2h) – Review of the technical challenge and deeper discussions.
4. Engineering Manager Interview (1h) – Final deep dive into technical decision-making and role expectations.