Hire mid-level freelance Ruby on Rails developers in United States

I started writing apps at 8 years old in Microsoft Access with my Dad. Then 3d games in BASIC, and finally in college PHP and MySQL web apps. Never looked back. Mid-Level/Senior Software Engineer capable of independently developing and assisting in the design of products loved by customers and associates, with many years of experience with full-stack technologies in a cloud environment, and back end technologies such as Java and C#. Great attention to detail with well-architected systems and enjoyable user interactions. Strong communicator with interpersonal savvy.

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 Software Developer with 10+ years of experience delivering robust full-stack software solutions. Extensive experience developing with Ruby, (Ruby on Rails, Sinatra), Python (Django, Flask, FastAPI), and Javascript. Proven track record architecting cloud-native applications, optimizing CI/CD pipelines, and orchestrating infrastructure. Deep understanding of testing software and continuous delivery systems. Adept at leading Agile teams and modernizing legacy systems to drive scalability, performance, and speed to market.

I majored in mathematics at Penn State, where I worked on simulation and data modeling projects. I found myself drawn more to the coding side than the math itself, and after graduation I pivoted into software development with the goal of building tools that people actually use and rely on. I now work at Alpha Omega Integration on a USCIS project where we’re digitizing the asylum and refugee process. I’ve led a refactor that made our Rails architecture form-agnostic, which prevented a costly split into multiple systems. I also migrated our test suite to Playwright, cutting runtime by over 75 percent and helping us ship with more confidence. Rails has clicked for me because it encourages clean, readable code and rewards long-term thinking. I care about building systems that are easier to reason about, easier to maintain, and easier for others to step into. Whether through thoughtful refactors, clear conventions, or active collaboration, I try to make code better for everyone who works with it.

I'm a full-stack developer with a strong foundation in React and Ruby on Rails, and a track record of building fast, reliable, and user-focused applications for startups. I've contributed to products across fintech, SaaS, e-commerce, and healthcare—adapting quickly, shipping often, and solving real-world problems with clean, scalable code. I thrive in fast-paced environments where collaboration, curiosity, and impact matter most.

Experienced Ruby on Rails developer with nearly 9 years of professional experience designing, building, and maintaining APIs, microservices, and secure transaction systems. Proven track record integrating with major payment providers and delivering clean, well-tested, maintainable code. Strong collaborator with a passion for problem-solving and improving fintech systems.

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.

With 5+ years of Rails experience, I come with a wide range of experiences and love to delve into new projects. I am working on a variety of pure Rails apps, leveraging the power of Hotwire and TailwindCSS on the front end. My personal project is https://anecdot.co, a platform for recording, preserving, and sharing life stories.

Hi! I'm Liz 👋🏼 I'm about as full-stack 🥞 as they come. I started as a QA and automation engineer and now I'm a senior full-stack engineer focusing on Rails and React. Early on as a QA I worked on projects from writing SQL scripts to check data, to automation engineering, to React Native applications, and even helping implement Kafka instances and a team transition to Kubernetes. Then I moved on to development, mostly focusing on Rails / React stacks. I also am very comfortable working in Python. Now I've been a full stack developer for a few years, always carrying my QA mindset with me. I love exploring the ins and outs of a problem, and figuring out where I can pick it apart and expose weaknesses. I'm really great at building relationships with stakeholders, establishing trust and cooperation so that we can all move forward with a project in a very pragmatic way. Pairing with coworkers is always very enjoyable for me. I like the collaboration, but I really value the mentorship the most. Teaching juniors git has become a mainstay for me, as well as coaching them to maintain a calm mindset while debugging, encouraging them to move through issues in a systematic way. And of course I always fit in robust testing, showing folks how to create test suites and pipeline automation that will improve their workflow. Let's talk about how I can contribute to your team and stack 🙌🏻

I’m a senior developer and product strategist with 10+ years building custom software, mostly with Ruby on Rails. I turn complex problems into fast, scalable solutions—and I always build with the end user (and the business) in mind. I got into dev through entrepreneurship—building tools to run my own businesses. That mindset never left. I think like a founder, move fast, and care deeply about results. Lately, I’ve been focused on integrating AI into products: • Automating workflows with tools like OpenAI, Make.com, and LangChain • Building AI-powered features that enhance user experience and drive growth • Helping SaaS teams use AI to scale smarter without adding headcount I’ve led everything from zero-to-one builds to product turnarounds, working closely with founders and small teams. I thrive in fast-moving environments where priorities shift and speed matters. When I’m not building software, I’m in the mountains snowboarding, hiking, or chasing the next great view. Let’s connect if you need someone who can think strategically, code fast, and actually ship.