Senior Backend Developer (PHP)

You will be joining a mature, data-driven digital health platform that helps users better understand their health, performance, and longevity through personalized insights. The product aggregates and processes large volumes of biometric, laboratory, and lifestyle data, transforming them into actionable recommendations using advanced analytics.

From a technical perspective, this is a high-load, production-grade system with:

• complex backend logic and data pipelines,
• heavy API usage and third-party integrations,
• strict requirements for reliability, performance, and scalability,
• continuous growth in users, data volume, and feature set.

The platform operates as a long-running SaaS product with a strong focus on backend architecture, data consistency, and system evolution rather than short-term feature delivery.

Responsibilities

• Design, develop, and maintain backend services written in PHP
• Take ownership of backend architecture decisions and long-term technical direction
• Build and evolve RESTful APIs used by web and mobile clients
• Work with relational databases and optimize queries and data models
• Participate in designing scalable solutions for high-load environments
• Integrate and maintain third-party services and internal subsystems
• Ensure code quality through clean, readable, and maintainable code
• Collaborate with frontend engineers, QA, DevOps, and product stakeholders
• Participate in code reviews and technical discussions
• Contribute to system stability, performance optimization, and technical debt reduction

Requirements

Must-have

• 7+ years of professional web development experience
• Strong knowledge of PHP 7.x and 8.x
• Excellent understanding of OOP, MVC, and ORM principles
• Solid experience with RESTful architecture and API design
• Hands-on experience with Yii and Symfony, with a good understanding of modern PHP framework architecture
• Working knowledge of JavaScript/TypeScript, including React, Next.js, and jQuery
• Experience with MySQL and/or PostgreSQL
• Experience with Git and Jira
• Understanding of backend scalability, performance tuning, and distributed system fundamentals
• Familiarity with Nginx, Docker, and docker-compose
• Experience working with high-load or data-intensive systems
• Ability to write clean, readable, and maintainable code
• English level: B2 (Upper-Intermediate) or higher

Nice to have

• Experience with Redis, RabbitMQ, or Gearman
• Experience with TeamCity or other CI/CD tools
• Basic knowledge of GNU/Linux and bash