Hire principal / staff freelance Ruby on Rails developers

1400+ Ruby on Rails developers looking for their next gig. Juniors to seniors and everyone in between, you'll find them all here.


Showing 464 of 1400+ developers. Reset filters

Developer's avatar

Senior Ruby On Rails developer with 10+ years experience

High response rate
Recently updated

I'm a programmer living in Belgium. Passionate about building beautiful things through craftsmanship. --- EXPERIENCE --- Senior Developer PAUWELS CONSULTING ⋅ [ 2022 – PRESENT ] • Integrated Single Sign-On (SSO) with Keycloak for Belgian cities and municipalities. • Set up and maintained a background processing system to fetch, parse, anonymize, and store millions of emails daily • Migrated a actively used FinTech application from PostgreSQL to MariaDB. Founder & CEO FRONTIER ⋅ [ 2017 – PRESENT ] • Developed and implemented digital strategies for over 50 SMEs. • Set up, configured, and managed a fleet of servers tailored to customers' projects with Kamal. • Built a gem to create great-looking forms with Bootstrap • Developed an in-house CMS with a wide range of features, including live preview, revision history, a form builder, an email marketing tool, impersonation, a media library, ACL, SSO, over 100 integrations, … Senior Developer DPG MEDIA ⋅ [ 2019 – 2019 ] • Modernized a Ruby on Rails application that is used by national radio stations (e.g., QMusic, JoeFM, and Willy). Work on removing technical debt and increasing test coverage. • Designed an API to be consumed by native mobile apps. • Developed a radio player widget to be embedded in multiple frontends. Medior Developer OMAKASE ⋅ [ 2015 – 2019 ] • Architected a community platform with social features like a web feed, discussion board, live chat, and job board • Set up CI/CD pipelines and monitoring. Managed infrastructure and tuned a bare metal server configuration to maximize performance. • Managed a team consisting of designers, frontend- and backend developers. Junior Developer MULTIMEDIUM ⋅ [ 2012 – 2015 ] • Started with no professional background or any relevant training and quickly took the position as the lead front-end developer. • Built an asset management tool for a large supplier of dentistry products. • Launched audience engagement games on eCommerce websites with more than 10,000 active users. • Manually crafted HTML newsletters for a large media production house --- SKILLS --- Ruby On Rails, Hotwire, JavaScript, UNIX, HTML, CSS, MySQL, PostgreSQL, RubyGems, Docker, Neovim, Nginx, AWS, Photoshop, Figma, Sketch and more --- CLIENT LIST --- Perrigo, European Commission, LiveNation, Samsonite, Pearl Vision, MTV, DPG Media, Bpost, Studio 100, Jaga, KIA --- PERSONAL --- • Born in 1988 • Living in Belgium • MBTI-INTJ personality • Father of a boy and a girl • Hobbies: making, building, brewing, • squash, cuisine, road trips --- EDUCATION --- Master of Education (M.Ed.) UNIVERSITY OF ANTWERP [ 2011 – 2012 ] Master of Science (M.Sc.), Biology: Ecology & Environment UNIVERSITY OF ANTWERP [ 2009 – 2011 ] Bachelor, Biology UNIVERSITY OF ANTWERP [ 2006 – 2009 ] High School KLEIN SEMINARIE HOOGSTRATEN [ 2000 – 2006 ]

Developer's avatar

Versatile engineer bridging AI and human needs

New profile

With 9 years of engineering excellence across diverse domains, I've mastered the art of transforming complex challenges into elegant technological solutions. As the creator and maintainer of the Solid Queue Monitor gem(https://rubygems.org/gems/solidqueuemonitor) —a zero-dependency monitoring solution for Rails background jobs—I've demonstrated my commitment to improving developer tooling in the Ruby ecosystem. In my current role as a Staff Engineer at Torch.io, a coaching platform trusted by industry giants like Stripe, LinkedIn, Airbnb, and TripAdvisor, I've revolutionized support systems by implementing OpenAI's GPT-3.5 for email automation, reducing manual intervention by 48%. I've also leveraged AWS Bedrock with Claude 3.7 to generate organizational insights reports, improving decision-making efficiency by 40%. My technical versatility spans the full spectrum of development—from crafting robust backends with Ruby, Go, and Python to building responsive frontends with React, Angular, and TypeScript. I've engineered large-scale data applications handling 5+ million active users and orchestrated seamless migrations of 4.5 million records while maintaining system integrity. Throughout my career, I've delivered impactful solutions across multiple domains—enhancing FinTech security protocols, optimizing CMS performance, and elevating coaching platforms. This domain versatility, combined with my technical depth and AI integration expertise, allows me to bring a unique perspective to every project and consistently deliver transformative results.

Developer's avatar

Rails Consultant with AI experience

High response rate

Seasoned Rails consultant with 8+ years of experience. From MVPs to products with millions of users. Self-driven and easy to manage. I can provide up to 6 hours of overlap with the US timezone and full overlap with EU/UK time zones. Remote: Global, OnSite: India/Middle East/Asia. Some Interesting Complex Problems Solved AI integrations using voice models, openAI, and random forests. Video/audio freeze detection: Used openCV to detect if a video is in a frozen state with more than 99% accuracy CoBrowsing: Created CoBrowsing feature for a customer service app that allows to take control of a customer's browser without using any plugins except this JS CoBrowsing widget code. Server management platform: An internal dashboard for a client that allows users to control thousands of servers and field devices scattered across the globe. It allows the users to execute scripts on those servers, configure, provision, web-based SSH, etc. Common Freelance Gigs Performance optimizations of Rails, PostgreSQL, and Sidekiq: Helped multiple clients to scale Rails Upgrades Legacy modernization: Helping legacy Rails applications to modernize the stack, including the front end. For example, Recently, I helped convert CoffeeScript/AngularJS 1.0 to JS/Vue. Third-party integrations. Skills: Ruby on Rails PostgreSQL React Stimulus TypeScript JavaScript GraphQL Server - Ruby GraphQL Client - Apollo CI/CD (CircleCI, Jenkins) Heroku

Developer's avatar

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.

Developer's avatar

Crafting Code with Creativity and Precision. A Ruby on Rails Developer at the Crossroads of Technology and Artistry.

From the workbench of a jeweler to the stages of Denver's music scene, my journey has been anything but conventional. Growing up, I was immersed in an environment that valued creativity and the process of making something beautiful from raw materials. This upbringing instilled in me an appreciation for craftsmanship and the beauty of creation, whether it was in the form of a piece of jewelry or the melody of a song. My foray into technology began with a childhood curiosity for the inner workings of electronics. This curiosity was not just about understanding; it was about deconstructing and reconstructing, seeing firsthand how complex systems could be broken down into understandable and manageable parts. This tinkering mindset led me naturally toward software development, where I found the same joy and challenge in piecing together code to create functional, elegant solutions. At 19, I ventured into the creative wilderness, co-founding a band in Denver. For six years, I immersed myself in music, an experience that grew my collaborative skills and deepened my understanding of creative expression. However, amidst chords and melodies, I discovered a missing piece—software development. This realization was a turning point, prompting me to blend my creative passions with my technological inclinations. My encounter with Ruby on Rails was a revelation. Here was a framework that resonated with my artistic sensibilities, offering a balance between structure and freedom that I hadn't found in other technologies. Rails didn't just allow me to build web applications; it enabled me to craft them with the creativity and intuition I had cultivated as a musician and with jewelry. It was in Rails that I found my medium for technological artistry. Today, as a Ruby on Rails developer, I draw upon my unique background to approach software development with a blend of analytical precision and creative flair. My journey from jewelry workbenches to music stages, and finally to the world of coding, has shaped me into a developer who sees beyond the code to the stories and experiences that software can create.

Sign up now to see more profiles.

Gain access to 1500+ Ruby on Rails developers.