Professional headshot of J. Verheij, Senior PHP Engineer and Backend & API Specialist

J. Verheij

Senior PHP Engineer | Backend & API Specialist

Building reliable backend systems with PHP. API-first architecture. Long-term maintainability.

Senior PHP Engineer in Netherlands & Europe

Located in Netherlands (CET timezone), I provide remote PHP backend development services across Europe. As a freelance Senior PHP Engineer, I work with startups and established companies building scalable backend systems and APIs.

  • Remote PHP development services in Netherlands (CET timezone GMT+1)
  • Available for contract work across Europe with overlapping business hours
  • Senior-level PHP backend expertise with 8+ years of production experience
  • European GDPR-compliant development practices and data handling
  • Dutch VAT registration for seamless B2B invoicing within EU

Laravel Backend Specialist

Expert Laravel developer specializing in API-first architecture and scalable backend systems. I build Laravel applications that grow with your business, from MVP to enterprise scale.

  • Laravel 9, 10, and 11 expertise with modern PHP 8.x features
  • Laravel API development with Passport/Sanctum authentication
  • Eloquent optimization and database performance tuning
  • Laravel Queue systems for background job processing
  • Laravel package development and custom service providers

Symfony API Developer

Symfony framework specialist building enterprise-grade APIs and microservices. I leverage Symfony's component system to create maintainable, testable backend architecture.

  • Symfony 6 and 7 API development with API Platform
  • Doctrine ORM with advanced query optimization
  • Symfony messenger for event-driven architecture
  • Custom Symfony bundles and reusable components
  • Symfony security component for robust authentication

Backend API Specialist for Hire

Freelance PHP backend developer available for contract work. I help companies build reliable backend systems, optimize API performance, and scale their PHP applications.

  • Contract PHP backend development (3-12 month engagements)
  • API architecture consulting and implementation
  • Legacy PHP application modernization and refactoring
  • Performance optimization for high-traffic PHP applications
  • Remote-first collaboration with European timezone alignment

How I Work

Backend development requires clear thinking about system boundaries and responsibilities. My approach prioritizes clarity and predictability.

  • API-first design: The frontend is just another API consumer. This ensures consistency and reusability.
  • Clear ownership: Each service knows its responsibilities. No ambiguity about where logic belongs.
  • Boring is good: Proven patterns over clever solutions. The 3am debugging session will thank you.
  • Documentation as code: API specs, database schemas, and system flows documented where developers look for them.

Example API Endpoint

GET/api/time?region=europe
{
  "region": "europe",
  "timezone": "Europe/Amsterdam",
  "iso": "2026-01-07T14:30:00+01:00",
  "unix": 1736256600
}
This endpoint demonstrates clean API design principles: consistent structure, clear parameter naming, multiple time formats for different consumers, and predictable error states. Real-world APIs I build follow these same patterns whether handling authentication, data processing, or system integration.

Systems Built

Multi-tenant SaaS Platform

Designed and implemented a complete backend API serving multiple web and mobile applications. Built tenant isolation at the database level, role-based access control with granular permissions, and webhook system for third-party integrations. Handled 2M+ API calls daily with sub-100ms response times.

Authentication & Authorization Service

Created a centralized authentication system handling OAuth2, API tokens, and session management. Implemented rate limiting, audit logging, and automated threat detection. Served as the authentication layer for 15+ internal services with zero downtime over 18 months.

Data Processing Pipeline

Built an API-driven system for ingesting, validating, and processing structured data. Implemented idempotent operations, retry mechanisms, and comprehensive error tracking. Processed 500K+ records daily with automated validation and correction workflows.

Technical Stack

PHP 8.2+
Laravel
Symfony
REST APIs
MySQL / MariaDB
PostgreSQL
Redis
Docker
Linux
Git
PHPUnit
OpenAPI

Contact

Direct Email:

Location: Netherlands (CET/CEST timezone)

LinkedIn: linkedin.com/in/jverheij

Available for remote contract work