Hire nível c freelance Ruby on Rails developers

Over 10 years of experience going from 0 to scale as an Engineering and Product Leader 6× Founding Engineer of multiple successful companies, including a telehealth unicorn Ruby on Rails enthusiast, building real tangible value since v3

I'm Dallas Hart, a Senior Full-Stack Software Engineer with over a decade of experience building scalable, secure, and AI-integrated applications across fintech, healthcare, and e-commerce. My career has been driven by a passion for solving real-world problems through clean architecture, intelligent automation, and collaborative product development. My journey began with a love for building things that make people's lives easier — starting from early scripting projects to leading cloud-native application rollouts used by thousands. I’ve architected HIPAA-compliant health portals, PCI-secure payment platforms, and AI-powered fraud detection engines — all while optimizing for performance, reliability, and user experience. Whether I’m modernizing legacy systems or deploying microservices on AWS Lambda, I keep my focus on delivering measurable business outcomes. One of my proudest achievements was leading the development of a patient portal that reduced admin workload by 30%, while also integrating third-party AI to personalize content and drive engagement. I also designed a fraud detection system that cut chargebacks by 26% — blending ML with real-time Kafka and GraphQL. I bring a rare combination of deep technical expertise, strong product sense, and cross-functional collaboration. I thrive in environments where I can work closely with stakeholders and turn ambiguous business needs into robust systems that scale. If you're looking for someone who can own the full stack, drive AI integration, and push for engineering excellence — I’m your guy.

Senior Full Stack Developer with 10+ years of experience delivering scalable, performant solutions across global enterprise and e-commerce platforms. I've led engineering efforts that directly improved business outcomes—cutting page load time by 96% for NinetyPercent.com, boosting form submission rates by 275% at Owens Corning, and reducing security vulnerabilities by 19.3% through large-scale refactoring. At Owens Corning via Toptal, I introduced a reusable geolocation service adopted by 9 datasets and built a multilingual translation engine that improved LATAM and Canadian outreach. My contributions consistently reduce costs, enhance UX, and modernize legacy systems with measurable results. Skilled in Ruby on Rails, React, Symfony, Postgres, Docker, Redis, and CI/CD pipelines, I thrive in remote, agile environments, leading teams with a balance of technical depth and collaborative mentorship.

I’m a senior full-stack Ruby on Rails developer with 8+ years shipping production-grade software — from bootstrapped MVPs to fully-fledged SaaS platforms. I thrive in startup environments where shipping fast, clean code is key, and where product thinking is just as important as engineering chops. Rails is my weapon of choice — API-first apps, Hotwire interactivity, background jobs, payments, and complex business logic? All handled. I build with intention, scalability, and UX in mind. Beyond code, I’ve co-founded multiple products, run lean experiments, managed integrations with payment gateways (M-Pesa, Stripe, Paystack, Circle), and built systems used by thousands in Kenya and beyond. I speak startup.

I didn’t start out planning to be a developer—but solving problems though applied technology pulled me in. What began with scripting solutions for tedious workflows turned into building full-scale platforms used by thousands. Today, I’m a full-stack developer and technical founder with a deep understanding of both code and the business logic behind it. I have worked across both public and private sectors, and in industries ranging from Logistics and Aviation, to Retail and Education. My early career experience as a solutions architect reinforced my customer and user concentric approach. What sets me apart isn’t just the code I write—it's my ability to understand what users actually need and deliver scalable, elegant solutions that exceed expectations.

A passionate Ruby on Rails developer, author of i Love Ruby https://i-love-ruby.gitlab.io/ I am a person who can build projects on a turn key basis. I completely agree with 37Signals philosophy of developing software. I agree with Rails 100% including the way it enables us to build modern web apps with Hotwire. I am constantly looking for ways to develop applications with perfection and with less of cognitive load for developers. I love to build high performance teams for your business, and keep them mentally healthy so that we have an honest work place where people are free to tell facts. Follow me code here https://gitlab.com/mindaslab My ruby book https://i-love-ruby.gitlab.io/ My current hobby Rails project: https://yu7.in/ Companies I serve now as freelancer: Healthicity https://www.healthicity.com/home Numerical Works https://numerical.works South Indian Safari https://southindiansafari.com/ (yet to launch) My previous projects: FINavigator https://fi-navigator.com/ Optoro https://en.wikipedia.org/wiki/Optoro Tech Architect for Rails teams in Guidehouse https://guidehouse.com/

I’ve always been fascinated by the intersection of creativity and technology. My coding journey began when I discovered how a few lines of code could transform an idea into a fully functioning application. From that point on, I was hooked: I poured countless hours into experimenting with everything from Ruby on Rails to more modern JavaScript frameworks. Over the years, I’ve refined my skills and found my passion in building clean, maintainable systems that put user experience first. One of my proudest earliest accomplishments involved leading a small team to develop a custom internal tool that automated a tedious data-entry process. Seeing the hours of manual work drop to just a few minutes was incredibly rewarding—it reminded me why I love being a developer in the first place. I’m constantly seeking new ways to grow: whether that’s diving into emerging technologies, improving my testing strategies, or exploring new coding paradigms, I believe there’s always more to learn. Above all, I thrive on solving tricky problems in ways that others might not have considered. I love collaborating with designers, project managers, and fellow developers to turn concepts into polished products. I bring a unique blend of empathy, curiosity, leadership and technical expertise that helps me bridge communication gaps and ensure every project is set up for success. Helping teams build something truly meaningful is what drives me—and I’m excited for what comes next.

I'm a full-stack Rails developer with experience building robust, scalable products, whether as a Ruby monolith or with TypeScript/ReactJS frontends. I've been working with Rails for over 10 years (since version 3.x) and have specialised in creating and maintaining codebases that are easy for teams to read, understand, and maintain. Key to those goals are: using standardised code styles (ensuring RuboCop and the team's practices are perfectly aligned) writing well-structured, easy-to-understand and fast tests constructive and collaborative code reviews ensuring documentation, from git histories to READMEs and other materials (online and offline) records useful, meaningful information that can be easily kept up to date and in sync with any code changes I've recently been adding GraphQL to my skill set, which also includes PostgreSQL, ElasticSearch, Redis and other languages (Swift, PHP, JavaScript, and more). On the front end, I have experience with both Rails' native toolset and ReactJS, Next.js, and React Native. I also have experience with platform-native toolsets, such as SwiftUI, to deliver applications that feel intrinsically part of the user’s mobile experience. I've worked on projects of various sizes, from scheduling and booking software for a major tech training company to systems that enable TV distributors to sell thousands of hours of programming worldwide. Ideally, I'm looking to work on products with which I can feel personally invested – an exciting product or tech-for-good project would definitely suit me better than a fintech role.

I am passionate about helping first-time founders navigate the complex world of software development. My approach focuses on discovering, planning and building the MVP that lets you to validate your concept, raise money, or get your first paying customers quickly while assisting you with establishing the long-term roadmap of your product. My 25 years of experience in software development span three countries and fields as varied as online banking, text messaging, politics, logistics, e-commerce and sports facility management. I've been technical lead, co-founder, CTO and independent consultant, building and shipping product every day by myself or with small teams, from one-person shops to VC-backed scale-ups with successful IPOs and private exits. What sets me apart is my commitment to making myself replaceable. I create maintainable, well-documented code as well as automated testing, deployment and monitoring practices that make it easy to bring development and operations in-house when you’re ready. My goal is to provide maximum value at every stage while setting you up for independence and long-term success. My preferred technical stack is Ruby on Rails (with Hotwire Native for mobile), which empowers me to build and ship fully functional, well-tested and feature-rich apps within a few weeks (or sometimes days).

Hi ... I'm Francis. With a background in Electrical and Electronics engineering, I have worked in fast paced startups over the last 6 years to build and scale applications that are not only purposeful and maintainable but also evolve to leverage new tech and trends. Recently, I worked to architect and implement two mobile app applications and web apps all powered with Rails and integrating AI in search, recommendation and extraction areas. This has helped them get to a level of personalization that beats competitors and increased our retention rates by over 30%. Whether you are seeking a team lead, CTO, or a driven and adaptable backend or frontend engineer to join your team, I am a highly capable and experienced professional ready to make a lasting impact. Over my years in engineering, I have learnt that conventions only take you so far, experimenting with the new, the different and the niche often moves the needle in business and can be what makes a customer stay. This has inspired me to venture into ViewComponent, Plex and even AI to see what can be improved or done different to surpass the customer requirements using Rails and related stacks. Having worked with various platforms including AWS, GCP, HuggingFace and more, I am always willing to learn and keep chipping at hard problems and leveraging what exists to build solve business and engineering problems. I look forward to chatting about your busines and how my skills and expertise can be of value to your team, clients and business objectives. My skills of interest in this domain include: Ruby on Rails, TailwindCss, HotWire and Stimulus, React, Bootstrap, JQuery, Heroku, AWS, GCP, Azure, HuggingFace, DevOps, MongoDB, PostgresQL and more.