Senior PHP Developer

Company: IT_One
Location: Moscow, Russia
Format: remote
Employment Type: full-time

About the Company and Team

We are IT_One, a strategic partner for the digitalization of Russian business and government agencies. Our team implements the largest digital transformation projects. We have assembled a large team that combines professionalism, experience, and youth. Over 2500 employees. Offices in Moscow, St. Petersburg, and Omsk.

We are currently looking for a PHP Developer (Senior).

Designing clean application architecture, deep refactoring of the existing codebase, performance optimization at the intersection of PHP, MSSQL, and message queues, as well as ensuring the technological quality of the VZR product.

Candidate Expectations

1. Architectural Skills and Code Culture (Expert Level).

Deep understanding and practical application of patterns and principles: Flawless command of GoF (Gang of Four), SOLID, DRY, KISS, YAGNI.

Clean Code and Refactoring: Solid skills in decomposing monoliths, systematically eliminating technical debt, and refactoring complex, tangled code without violating business logic. Ability to write easily maintainable and testable code.

Architectural Approaches: Experience in designing systems using DDD (Domain-Driven Design), CQRS, and Hexagonal Architecture.

2. Backend Stack (PHP & Frameworks).

PHP 8.x: Deep knowledge of the PHP engine.

Mandatory: Fundamental understanding of memory management in PHP (Zval, Garbage Collection, reference counting, memory leaks in long-running processes, optimizing memory consumption when processing complex data arrays).

Symfony 7.4+ & Laravel: Expert command of both frameworks. Understanding the internal workings of their Dependency Injection (DI) containers, request lifecycle, working with the Event Component, packages, and custom Artisan/Console commands.

3. Data and Database Management (T-Shaped / DBA-like Level).

Deep knowledge of T-SQL & MS SQL Server: Expertise in writing complex, optimized queries, stored procedures, triggers, and common table expressions (CTE).

Database Performance Optimization: Thorough understanding of index construction and operation principles (clustered, non-clustered, covering, filtered).

Profiling and Analysis: Ability to read and analyze query execution plans, identify bottlenecks (Table Scan, Index Scan vs Seek), combat deadlocks, and optimize transaction isolation levels.

4. Asynchronous Interaction and DevOps Stack Apache Kafka: Experience in building Event-Driven Architecture (EDA). Deep understanding of producer/consumer operation, guaranteed message delivery (At-least-once, Exactly-once), handler idempotency, working with partitions and replication.

Docker & Kubernetes: Solid command of containerization. Understanding of application operation principles in K8s (pods, services, deployments, memory and CPU mapping configuration, log reading, understanding the mechanics of liveness/readiness probes for PHP-FPM and Kafka workers).

5. Testing and Tools.

Testing: Covering code with quality tests (PHPUnit).

Understanding the difference between Unit, Integration, and E2E tests. Skills in writing mock objects.

Profiling: Experience working with performance analysis and memory leak tools (Blackfire, Xdebug, Profiler).

Working Conditions

• Official employment according to the Labor Code of the Russian Federation in an accredited IT company, white salary;
• Voluntary medical insurance after the probationary period;
• Remote work within the Russian Federation;
• Corporate training and certification, opportunities for professional development and career growth;
• Internal professional communities and meetups for knowledge sharing;
• Corporate discount program and privileges (Best Benefits);
• Access to the largest sports platform FitStars;
• Joint activities and events (board game nights, random coffee, book club, chess club, as well as a running club in the summer season) and other well-being activities.