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Tero JousiTJ

Tero Jousi

Freelancer — WordPress & WooCommerce Development

€550/day
Fuengirola, ES
8-15 years

Average response time: 1 hour

About Tero

I am a senior WordPress and WooCommerce developer with 8 years of experience building custom functionality, plugins, integrations, and performance-focused solutions for business-critical websites and online stores.

My strongest area is solving problems that standard plugins do not handle well: complex WooCommerce business logic, custom checkout and order workflows, API integrations, large product catalogs, high-performance search and filtering, automated data synchronization, and difficult performance or database issues.

I work across the full technical stack of a WordPress project, including PHP, JavaScript, MySQL, REST APIs, custom plugins, WooCommerce hooks and filters, Redis caching, WP-CLI, Git, and Linux-based production environments.

Recent work includes custom search and filtering architecture for WooCommerce catalogs with tens of thousands of products, reservation and availability systems, CRM and accounting integrations, supplier data imports, subscription and payment troubleshooting, and production performance optimization.

My background is in electrical engineering, technology business, and product development. I approach software projects as engineering problems: first understand the real business requirement, then design the simplest maintainable solution rather than adding unnecessary complexity or plugin dependencies.

I work remotely from Spain with my clients.
  • Finnish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • dxw3
    Freelancer — WordPress & WooCommerce Development
    June 2018 - Today (8 years and 1 month)
    • • Architect and deliver custom WordPress and WooCommerce plugins for ecommerce, training, automotive, B2B, and operational workflows.
    • • Extend checkout, cart, subscriptions, stock, order processing, admin interfaces, imports, and product data models using WooCommerce hooks and APIs.
    • • Build and maintain integrations with external systems using REST, SOAP, OAuth2, and webhooks, including CRM, accounting, supplier, booking, and shipping systems.
    • • Optimize large WooCommerce catalogs with custom SQL indexes, query redesign, caching, WP-CLI tooling, import orchestration, and database cleanup.
    • • Diagnose complex production issues across payments and subscription states, Action Scheduler, cron, REST API load, PHP worker saturation, and server configuration.
    • • Work directly with customers from requirements and technical design through implementation, deployment, debugging, and continuous improvement.
    WordPress Plugin Development External API Integration Performance Optimization Database Management WooCommerce
  • Various Companies
    Earlier Engineering & Technology Career
    January 1997 - January 2018 (21 years)
    Engineering, Semiconductor Industry & Technology Ventures
    • • Began my career in quality-system development after graduating in electrical engineering, working with structured technical processes and systems.
    • • Continued in the semiconductor industry in technical, customer-facing, and business roles, including responsibility for major international strategic accounts.
    • • Moved into technology entrepreneurship in vibration energy harvesting, combining engineering, product development, and commercialization.
    • • Later worked in the parking business and entrepreneurship before transitioning fully into WordPress and WooCommerce engineering in 2018.

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Education

  • Master of Science
    Aalto University
    1997
    Master of Science

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