Contact person: Business Client

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Location: Alwar, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"We are seeking an experienced WordPress plugin developer to build a premium multilingual translation plugin. This solution must combine the speed and intelligence of advanced AI models (Gemini and ChatGPT) with the precise control and SEO performance of leading manual translation tools (like TranslatePress).

Required Support Period: 120 days of post-launch support and bug fixing.

Payment Terms: Full payment will be released after the 120-day support period is complete and the plugin is stable.

Bidding: All professional developers are welcome to submit bids based on their estimated cost for this defined scope of work.

II. Core Features: Hybrid AI Translation Workflow
The plugin's primary focus is providing a seamless, two-step translation process: AI Drafting and Manual Review, ensuring the final output is high-quality, professional, and consistent.

2.1 AI Translation Engine Integration
The plugin must securely integrate with modern, high-quality AI services.

Mandatory AI Engines: Support for Gemini API and ChatGPT/OpenAI API (and optionally DeepL) must be included.

Secure Setup: The administrative dashboard must include a simple way to enter API keys, which are then handled securely to protect the user's paid API accounts.

Usage Monitoring: A feature must be included to track and monitor the character/token usage to help manage translation costs.

2.2 Translation Automation (Bulk and Individual)
The plugin must provide powerful automation capabilities while prioritizing content integrity.

Bulk Site Translation: Upon activation, the plugin must offer a one-click feature to automatically translate all existing posts, pages, and custom content into multiple selected target languages.

Content Integrity: The AI must be specifically instructed to only translate the text and never alter or break the underlying HTML code, links, or formatting of the content.

Individual Post Panel: When editing a post, a dedicated panel must allow the user to automatically translate (using AI) the Post Title, Content, Tags, and SEO Metadata for that specific post.

2.3 Manual Editing and Quality Control (MTPE)
To ensure professional quality, the plugin requires robust human post-editing capabilities (Machine Translation Post-Editing or MTPE).

Visual Front-End Editor: A visual editing interface (similar to TranslatePress) must be available, allowing users to translate any visible element on the page (post content, menus, widgets, theme text) directly from the front end.

Manual Overrides: The individual post panel and the visual editor must allow the user to manually edit and override any AI-generated translation for perfect accuracy and brand consistency.

Glossary/Terminology: A feature must be included to define and manage specific terms (like brand names or legal phrases) to enforce consistency across both human and AI translations.

III. International SEO and Structure
The plugin must automatically handle technical requirements for international SEO success, with a focus on a clean URL structure.

3.1 Primary URL Structure: Subdirectories
The main focus of the URL structure must be the use of Subdirectories (or virtual folders).

Subdirectories: The plugin must support and utilize the SEO-preferred structure where the language is indicated in a virtual folder (e.g., [login to view URL]).

Alternative Structures: Support for Subdomains (e.g., [login to view URL]) and URL Parameters (e.g., [login to view URL]) must also be available as alternatives.

3.2 Automated and Manual SEO Control
Localized Slugs and Links: The plugin must automatically translate post URLs (slugs). Users must also be able to manually set and edit these localized slugs for specific SEO targeting.

Internal Linking: The plugin must ensure that all internal links on a translated page point to the correct translated versions of other pages, not the original language content.  

Hreflang Tags: The plugin must automatically insert the necessary hreflang tags to guide search engines to the correct language version for users in different regions.  

3.3 Compatibility and Performance
Custom Content Handling: Must seamlessly integrate with custom fields and custom post types, including the Advanced Custom Fields (ACF) plugin, allowing for separate translations of custom data.

Shared Hosting Performance: The plugin must be architected to be extremely lightweight and fast, ensuring it does not slow down the website or consume excessive resources on a standard shared hosting plan.

IV. Project Deliverables and Ownership
Codebase: A fully functional, high-quality plugin codebase.

Documentation: Comprehensive documentation for both end-users and system administrators.

Ownership: The client will retain all intellectual property rights to the completed plugin codebase." (client-provided description)