Custom Backend Development & Business Systems: APIs, Automation & Electronic Invoicing

Palks Studio builds backend systems from scratch — complete Factur-X EN16931 invoicing, workflow automation and deployment on standard hosting. Server troubleshooting, PHP bug fixes, Apache configuration and site recovery after incidents. No framework, no CMS, no SaaS subscription. PHP, JavaScript, Python. Bilingual FR/EN.

Palks Studio designs and deploys technical systems, internal tools and from scratch automation, designed to address real business needs while remaining simple, understandable and maintainable over time.

A different approach, more reliable and more robust: no SaaS, no external dependencies, no subscription.
Result: less maintenance, fewer risks and controlled long-term costs.

The services and systems presented below are examples of solutions already developed, which can be deployed as they are or adapted to your specific needs.

• Server Integrations and Adjustments APIs, automation and backend integrations ›
• Complete E-Invoicing System Quotes, invoices, payments and exports ›
• Factur-X EN16931 Engine Integration into your existing system ›
• Autonomous Recruitment System Automatic scoring and recruiter dashboard ›
• Autonomous Data Collection System Data collection, processing and export ›
• Invoice Stamper Stamp and mark your PDF invoices as paid in one click ›

No imposed framework, no CMS, no database, without a SaaS subscription. Native PHP, JavaScript, Python. Apache, o2switch or equivalent.

Once delivered, the system operates autonomously. It is designed not to depend on ongoing technical support , while still allowing you to benefit from assistance whenever needed.

Who are these solutions for?

• Independent professionals and small businesses
• SMBs and growing companies
• Business software publishers
• Companies needing to design, stabilize or evolve a backend system

Technical resources are also available for developers, along with interactive experiences and animated visualizations to explore technical concepts in a more visual way.

➜ View technical resources

➜ View open source projects

500 errors, unresponsive scripts, unstable automations, difficult-to-maintain dependencies or repeated manual processing: these issues often appear at the level of tools, integrations or the backend system structure itself.

Over time, some architectures become difficult to evolve: accumulation of patches, external dependencies, scattered critical processes or fragile business logic.

Understanding these situations often makes it possible to stabilize an existing system, simplify certain workflows or reduce technical complexity without starting from scratch. See backend problems.

See also broader backend interventions and automation capabilities: ➜ autonomous backend systems.

Services are available from €600, depending on the scope and complexity of the work required.

Fix a problem

Self-hosted e-invoicing system with quotes, online signatures, native Factur-X EN16931 generation, payment tracking and structured exports, deployed directly on your own infrastructure.

Manage your quotes, invoices and payments from a single interface

A complete solution for managing quotes, invoices, payments and electronic invoicing, without external software or subscription.

Deployed directly on your own infrastructure, the system operates autonomously, with a clear architecture, full control over your data and complete traceability. Available as a complete solution or as independent modules depending on your needs. Compatible with Partner Dematerialization Platforms (PDPs) for electronic invoicing.

Available from €1,500, depending on the selected modules and required level of integration.

A Factur-X compliance demonstration is available here.

View the system

Structured application form, automatic candidate scoring, recruiter dashboard and multi-campaign management, directly deployed on your hosting environment.

Manage your recruitment from a single interface

Recruitment systems are available from €3,500, depending on configuration requirements and any specific adaptations. The setup of the initial recruitment campaign is included in the service.

Your job postings remain published on your usual recruitment platforms.

View the system

Create multi-source searches, collect websites, emails and phone numbers, clean and normalize data, track contacted prospects, and export CSV/JSON; fully executable locally or on dedicated infrastructure.

Simplify your lead generation with an autonomous system

Data collection systems are available from €2,400. They can run locally without a dedicated server and are delivered with clear documentation for straightforward, autonomous installation.

View the system

Free tool to generate professional PDF quotes directly in your browser.
No account required, no data transmitted.
Bilingual (FR / EN), customizable logo, multi-currency support.
Automatic tax rules and legal notices based on the type of transaction and the client's country.

Generate a quote

Free tool to generate EN16931-compliant Factur-X invoices directly from your browser.
Hybrid PDF/A-3 with embedded XML, including XSD and Schematron validation.
Powered by the same engine used in production, with no account required and no data transmitted.
Automatic legal notices, built-in tax logic and fully transparent processing.

Generate a Factur-X Invoice

Every system presented here has been designed, tested and used in real conditions before being offered. No prototype, no fictional demo, just tools that run and have been proven in practice.

The approach is the same for every project: defined scope, documented delivery, readable and maintainable code.

Discover technical services