
Julien Brancher
Verified Expert in Engineering
Full-stack Developer
Sofia, Bulgaria
Toptal member since September 14, 2022
Julien is a full-stack developer specializing in web technologies with experience designing, implementing, testing, refactoring, and maintaining advanced web applications. Passionate about designing complex systems to answer business needs in the most effective, reliable, and secure way, he is attentive to standards compliance, source code cleanliness, ergonomics, semantics, accessibility, and scalability. Julien is eager to take on new challenges and work on cutting-edge technologies.
Portfolio
Experience
- PHP - 10 years
- Software Architecture - 10 years
- Linux - 10 years
- REST - 10 years
- Vue - 5 years
- PostgreSQL - 5 years
- Common Lisp (CL) - 5 years
- PWA - 3 years
Preferred Environment
Vue, PHP, Ubuntu, Linux, PostgreSQL, NGINX, Sass, Software Architecture, Progressive Web Applications (PWAs), Docker
The most amazing...
...app I’ve developed is Ferryroute, a ferry ticketing platform aggregating over 40 European operators, available on Google Play and Apple App Store.
Work Experience
Software Architect, System Administrator, Full-stack Developer
Ferryroute
- Built the Ferryroute web application from initial MVP to production deployment for a travel agency, now actively selling ferry tickets from 42 ferry companies to customers across Europe.
- Implemented a framework with a resource system as its foundation with inegrated user and role based access control and shared / private cache.
- Developed a Google Maps interface for users to select their trip destinations.
Founder
Foxbee Technology
- Worked on a web development framework based on the Common Lisp language and PostgreSQL database.
- Built a custom shell based on Bash with autocomplete ability, documentation generation, and an important set of functions.
- Automated the creation of Debian packages, targeting the development environment and online servers.
Lead Full-stack Developer
Kiddies Kingdom
- Led the shop's transition from PrestaShop to Shopware 6, combining community and custom plugins. Implemented a Figma-based design with advanced techniques for a seamless user experience across devices.
- Developed a customized database migration strategy involving automated and guided database cleanup. This was executed as part of transitioning from a monolithic infrastructure to a highly scalable, multi-service cloud solution within AWS.
- Implemented integrations with 3rd-party services, including FreshRelevance for product recommendations, Yotpo for product reviews, and Mollie for payment processing.
- Developed a Chrome extension to automatically login into, navigate to and refresh web based dashboards displayed in the warehouse.
Lead Full-stack Developer
iProject
- Provided support to the web development team on key system components like payment gateways, code and query optimization, security compliance, and Linux server administration.
- Developed a framework on top of Vue to be one day used as the foundation of the new system supporting the client applications.
- Implemented a custom WebQL-like SQL language to support the report application, allowing it to perform complex filtering across multiple database tables.
- Implemented a comprehensive email system to send messages via multiple APIs.
Senior Full-stack Developer
Peugeot
- Improved the embedded authentication system found on most Peugeot and Citroën cars.
- Developed a hardware monitoring system to maintain custom computers used by official shops.
- Participated in the customization of a Linux kernel and the operating system.
Co-founder
LiLiRUN
- Conceived an innovative XML/XSL data format used by manufacturers to publish their products in our B2B marketplace.
- Developed a custom PHP framework inspired by Symfony and Laravel.
- Participated in the elaboration of the business plan.
Senior Full-stack Developer
Bright Network
- Designed and developed a system to match job offers with candidates.
- Developed a database visualization tool displaying data across graphs.
- Managed the database migration from MySQL to PostgreSQL using different table structures.
Full-stack Developer
Arkine
- Improved the existing process management system dealing with importing data coming from resellers.
- Implemented a Google Maps interface to help clients find the best garage to install their tires.
- Worked on different interface components to improve sales conversion rate.
Founder
Wibeo
- Developed a PHP framework inspired by Doctrine, Symfony, and Zend Framework.
- Developed several websites for a communication agency.
- Provided consulting services around web technologies.
Experience
Ferryroute
I designed, implemented, and deployed the whole system. On the back end, I implemented a custom framework, a resource system inspired by data-driven development, sourcing the data from different APIs. On the front end, I built a framework on top of Vue, allowing fast implementation of new functionalities and pages.
Foxbee AI
Foxbee Shell
Foxbee Compiler
Report Application
https://iproject.io/I implemented a custom WebQL-like SQL language to support the report application using prepared statements to avoid any SQL injections.
Project Management Application
http://iproject.ioOrder Monitor Application
http://iproject.ioSecure Access Web Portal
In addition, I applied advanced PostgreSQL access controls with strict role separation to ensure data isolation and maintain resilience even in compromised scenarios. I designed environment-aware error handling and containerized the system using Docker Compose, ensuring predictable behavior across both development and production environments.
Education
Master of Science Degree in Software Engineering
Graduate School of Computer Engineering (ESGI) - Paris, France
Certifications
Test of English for International Communication (TOEIC)
ETS Global
Skills
Libraries/APIs
Vue, Google Maps, Vue 2, ImageMagick, D3.js, FFmpeg, RequireJS, jQuery, Doctrine, Node.js, Vuex, JSON API, Claude API
Tools
NGINX, Webpack, Zabbix, GLPI, Subversion (SVN), Git, Composer, Adobe Experience Design (XD), Zeplin, Vue CLI, NPM, GeoNames, Pandoc, Docker Compose, Apache, Amazon CloudFront, ChatGPT, Claude
Languages
PHP, Bash, JavaScript, HTML5, CSS3, CSS, HTML, Bash Script, Common Lisp (CL), Sass, C++, C, Java, MathML, SCSS, PHP 7
Paradigms
REST, Clean Code, Search Engine Optimization (SEO), DevOps, Functional Programming, Serverless Architecture, Model Context Protocol (MCP), Role-based Access Control (RBAC)
Storage
JSON, PostgreSQL, MySQL, Memcached, Amazon S3 (AWS S3), Cache
Frameworks
Vuetify, OAuth 2, Zend Engine, Quasar, Bootstrap, Serverless Framework, Laravel, Zend Framework, Symfony, Agentic Frameworks, PHP MVC
Platforms
Ubuntu, Linux, Amazon Web Services (AWS), Docker, Android, iOS, AWS Lambda, Ollama, Amazon EC2
Other
Software Architecture, Frameworks, PWA, Full-stack, Web & Mobile Applications, Mobile App Development, Architecture, Back-end, Maps, Progressive Web Applications (PWAs), Full-stack Development, Web Development, APIs, SVG, Payment Gateways, SSL Certificates, Debian Packaging, English, Hybrid Apps, SSH, SSL, Terminal Servers, eCommerce, Front-end, AWS Cloud Architecture, SEO Tools, Documentation, Algorithms, Performance Optimization, Data Security, Cloud Architecture, IT Project Management, Google Tag Manager, Chemistry, Physics, Mathematics, Doxygen, Serverless, User Interface (UI), User Experience (UX), Symphony, FTP, Vue Router, Mobile First, Mobile-first Design, Back-office System Development, CTO, CEO, Solution Architecture, API Design, Technical Writing, Shopware, Google Analytics 4 (GA4), AI Agents, Agentic AI, Artificial Intelligence (AI), AI Integration, Cloud Infrastructure, Load Balancers, Amazon RDS, Chrome Extensions, CI/CD Pipelines, User Permissions, MVP Design, Voice Chat, AI Model Integration, Gemini, Grok, Gemini API, Google Antigravity, Row-level Security (RLS), Large Language Models (LLMs)
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