Senior Backend Developer (PHP / AI)

Multis Uk Limited; United Kingdom; Remote; GBP 70,000 - 100,000; Full time

Job summary

Multis UK Limited is seeking a Senior Backend Developer (PHP, AI) to design and enhance production systems, APIs, and online marketplaces. The role supports remote work with flexible patterns and involves AI-assisted development.

You will work on backend applications, REST APIs, and integration with third-party services, while guiding junior developers and leveraging AI tools to improve efficiency and code quality.

Qualifications

• Strong commercial backend development experience.
• Very good PHP and SQL knowledge.
• Experience designing and maintaining REST APIs.
• Git and modern development workflows.
• Linux and Docker experience.
• Ability to understand and improve existing codebases.
• Ability to work independently and make sound technical decisions.
• Comfortable using modern AI coding tools and AI agents as part of development.

Responsibilities

• Design and development of backend applications and REST APIs.
• Development in PHP 8+ with SQL databases.
• Architecture and improvement of existing production systems.
• Search, automation and third-party service integrations.
• Code review, debugging and automated testing.
• Use of AI coding tools and AI agents for development, research, testing and code review.
• Integration of AI APIs and agents into applications where appropriate.
• Technical guidance for junior developers.

Skills

Backend development

PHP

SQL

REST APIs design

Git workflows

Linux

Docker

Independent work

AI coding tools

Tools

Git

Docker

CI/CD

Job description

Senior Backend Developer (PHP / AI)

Multis UK Limited is looking for an experienced Senior Backend Developer for the development and improvement of production systems, APIs and online marketplace platforms. AI-assisted development is part of our everyday workflow.

Form of employment: part-time, full-time, contract

Location: Remotely

Job responsibilities

• Design and development of backend applications and REST APIs
• Development in PHP 8+ with SQL databases
• Architecture and improvement of existing production systems
• Search, automation and third-party service integrations
• Code review, debugging and automated testing
• Use of AI coding tools and AI agents for development, research, testing and code review
• Integration of AI APIs and agents into applications where appropriate
• Technical guidance for junior developers

Requirements

• Strong commercial backend development experience
• Very good PHP and SQL knowledge
• Experience designing and maintaining REST APIs
• Git and modern development workflows
• Linux and Docker experience
• Ability to understand and improve existing codebases
• Ability to work independently and make sound technical decisions
• Comfortable using modern AI coding tools and AI agents as part of development

Advantage

• MySQL and PostgreSQL
• Elasticsearch and search technologies
• Microsoft Azure or other cloud platforms
• JavaScript or TypeScript
• Automated functional and API testing
• Microservices and asynchronous processing
• Experience integrating LLM/AI APIs, agents or AI-assisted content processing

We offer

• Work on real international production systems and online marketplaces
• Modern development workflow including AI-assisted engineering
• Flexible remote cooperation
• High level of technical independence
• Opportunity to influence architecture and technical direction

Contact for this job position:

Multis UK Limited
[e-mail]