Hire senior Ruby on Rails developers in France

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CTO, Senior Full Stack Dev | RoR and Js/Typescript Expert | Remote

High response rate

Senior software engineer with over 10 years of experience as a remote freelancer. My educational background includes an MSc 2:1 in computer science and applied mathematics engineering from ENSEEIHT (Toulouse, France) in 2009. I then worked for 2 years as a frontend developer at a startup in London and transitioned to backend work in 2013. Specializing in web application development, I have undertaken projects for companies such as Carrefour, L'Oréal, Cocolis, Epicery, and Alerti. My work has encompassed backend development, data engineering, code and database performance improvement, e-commerce platform customization and logistics, payment system integration, API creation, crawlers, technical documentation, and testing. Passionate about data manipulation and rendering them to users and stakeholders in a more meaningful way, I am currently expanding my skills in AI/ML and neural networks through CNRS fidle formation to explore how I could apply and offer these services to my clients. Recent milestones and accomplishments include: Migrating the payment system from Adyen to Stripe for Epicery Migrating the frontend from Vue to Hotwire for Epicery Developing a geolocalized matching algorithm between carriers and packages for Cocolis Fields of expertise: E-commerce solutions with Solidus/Spree open-source framework Data processing and visualization with Business Intelligence tools for reporting Integration of payment system providers Integration of third-party APIs Database design and performance optimization Frontend performance optimization Crawling and scraping Technical audits Testing, documentation, CI/CD tools Experience with the following tools: Languages: Ruby, Typescript, JavaScript, Node.js, Ruby on Rails Platforms: AWS, Google Cloud Platform, Render, Heroku Frontend: React, Vue.js, Hotwire, Angular, HTML/CSS, Alpine.js, HTMX, Astro Payment providers: Stripe, Mangopay, Adyen, PayPal Data viz: Amazon QuickSight, Superset, Tableau Backend tools: Solidus open-source e-commerce solution, New Relic, Elasticsearch, PostgreSQL, Amazon S3, etc. CI/CD Tools: GitHub CI, CircleCI Fluent in French, English, Spanish.

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Senior Rails Developer

Hi there 👋 I'm Oussama, a passionate Ruby on Rails developer with over 13 years of hands-on experience in crafting robust web applications. My journey began with a fascination for elegant code and scalable architectures, and it has since evolved into a relentless pursuit of excellence in software engineering. 💼 Professional Background I have been deeply immersed in the Rails ecosystem since its earlier iterations, witnessing its growth and evolution firsthand. Throughout my career, I've contributed to various projects, ranging from startups to enterprise-level applications, consistently striving to leverage the best practices and emerging technologies to deliver high-quality, efficient solutions. 🚀 Expertise My expertise spans across: Ruby on Rails Development: Proficient in building full-stack applications, RESTful APIs, and microservices using Rails, ensuring scalability and maintainability. Database Design and Optimization: Experienced in designing database schemas and optimizing queries to enhance performance. Test-Driven Development (TDD): Strong advocate of TDD principles to ensure code reliability and maintainability, utilizing RSpec and other testing frameworks extensively. Frontend Technologies: Skilled in frontend development with JavaScript, React, or Ember.js, ensuring seamless integration with Rails backend. 🌟 What Drives Me I'm passionate about leveraging technology to solve complex problems and create impactful solutions. I thrive in collaborative environments, where my experience and expertise can contribute to innovative projects and foster a culture of continuous improvement.

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Knowledge seeking

I'm a full-stack web developer with a strong focus on building scalable, user-friendly applications that solve real business problems. My background in freelancing has given me direct experience working with clients, allowing me to deeply understand business pain points and the importance of asking the right questions to uncover users' true needs. I specialize in Ruby on Rails, CSS, and Stimulus, and I enjoy building small libraries to enhance development workflows. My approach to development balances design with usability—prioritizing clean, intuitive interfaces without sacrificing simplicity and performance. I'm also committed to CI/CD principles and have taken the time to learn Docker, knowing that investing in infrastructure pays off in the long run. Beyond web development, I take a broad interest in computing as a whole, recognizing how different abstraction layers, from hardware advancements to social adoption trends impact the field. I also take a history driven approach to learning, always asking why and when industry paradigms were adopted to better understand their purpose and evolution. I believe technology should empower people, and I’m especially interested in platforms that create financial opportunities whether it's helping businesses grow or supporting entrepreneurial pursuits. At the core, I'm always looking to refine my craft, whether by digging deeper into Ruby’s idioms or exploring new ways to build better, more efficient systems.

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Senior Software Engineer with more than 10 years of experience mostly focused in Ruby and JS, passionate about technology and self-taught.

High response rate

As a developer, my journey started with a curiosity for problem-solving and quickly turned into a passion for crafting elegant, maintainable code. My self-taught roots pushed me to dive deep into both the Ruby and JavaScript ecosystems, which has shaped me into a versatile engineer capable of handling both backend and frontend challenges. This adaptability has allowed me to thrive in complex, dynamic environments, often taking ownership of mission-critical projects that require innovative solutions and leadership. One of my proudest milestones was during my time at Salesloft, where I worked on a project to implement a bulk reschedule action for tasks in a dashboard used by sellers. The dashboard required real-time updates to ensure a smooth user experience, and the system had to handle thousands of tasks efficiently. To solve this, I created a Rails API that processed task IDs in batches using Sidekiq. Each task was passed to a service responsible for updating due dates, while Kafka was used to send updates back to the frontend. I built a component in the frontend that subscribed to Kafka events, ensuring that only the affected tasks were updated, thus minimizing API requests and enhancing performance. This approach preserved the user experience while significantly improving efficiency and scalability. What truly drives me is the opportunity to create software that has a real impact, whether it's streamlining processes, building tools that empower users, or mentoring others to reach their potential. I believe my strength lies in my ability to see the big picture, anticipate challenges, and proactively design solutions that are both scalable and maintainable. I don’t just focus on delivering code, I focus on delivering value. My combination of deep technical expertise, strong communication skills, and passion for problem solving means I can help bridge the gap between development teams and business goals, ensuring that technical solutions align with strategic objectives. I thrive in environments that value collaboration, learning, and innovation, and I’m always ready to tackle the next big challenge with creativity and enthusiasm.

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