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Coherent Solutions

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Job Description:

The project is high-load Ad Server platform with a large number of users that helps selecting and delivering auction-based ads in real time. The goal is to migrate from a monolithic PHP architecture to Nest.js microservices and enhance functionality with new features. The migration has just started, offering the opportunity to influence architectural decisions and work on a challenging, performance-critical system.

Job Responsibility:

Navigate and refactor a tightly-coupled codebase where UI components are generically driven by backend entity types
Break down high cohesion between frontend and backend to enable independent evolution
Identify and eliminate architectural bottlenecks blocking new product requirements
Modernize patterns where the generic framework creates unnecessary complexity
Balance maintaining existing abstractions vs. introducing pragmatic solutions
Design and implement new API endpoints in Laravel and Nest.js
Manage API versioning and backward compatibility
Work with complex query filter system and entity relationships

Requirements:

5+ years of experience in PHP and Laravel development
Experience working with microservices architecture
Experience working with SQL databases
Strong experience maintaining, refactoring, and improving complex, tightly coupled systems
Proven track record of decomposing monolithic applications into modular, scalable components
Solid understanding of dependency injection, service-oriented architecture, and interceptor patterns
Knowledge of English - from B2

Nice to have:

Experience with Nest.js or similar Node.js frameworks
AdTech domain knowledge (DSP, SSP, programmatic advertising)
Hands-on experience modernizing legacy systems or performing large-scale migrations
Strong understanding of design patterns: Factory, Strategy, Observer, Repository

What we offer:

Technical and non-technical training for professional and personal growth
Internal conferences and meetups to learn from industry experts
Support and mentorship from an experienced employee to help you professional grow and development
Internal startup incubator
Health insurance
English courses
Sports activities to promote a healthy lifestyle
Flexible work options, including remote and hybrid opportunities
Referral program for bringing in new talent
Work anniversary program and additional vacation days

Additional Information:

Job Posted:
December 07, 2025

Work Type:

Remote work

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