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Top freelance Ruby on Rails developers available to hire
I'm a Full-Stack Software Developer with 6+ years of experience specializing in building scalable, AI-driven, and automation-focused solutions. I’m passionate about creating seamless user experiences and writing clean, maintainable code that powers impactful applications.
I am passionate about solving complex challenges, optimizing workflows with automation, and delivering high-quality software solutions that drive business success.
I thrive in collaborative environments but am equally effective leading projects independently across various domains and tech stacks.
Hello! My name is David Kang, and I am a seasoned full stack web and mobile app developer with over 10 years of experience. My expertise spans from working as a DevOps Manager on small business apps to developing enterprise-scale web and mobile platforms for major companies.
Areas of Expertise:
CMS Platforms:
- WordPress / WooCommerce / Shopify
Front-end Development:
- Vue.js / Nuxt.js / Angular.js / React.js / Next.js
Back-end Development:
- Node.js / Express.js
- Python / Django
- PHP / Laravel / CodeIgniter
- Ruby / Ruby on Rails
Mobile Development:
- React Native / Flutter / Objective-C / Java
Enterprise Solutions:
- C# / ASP.NET / .NET Core / Unity
Cloud Services:
- AWS / Azure / Google Cloud
Databases:
- Firebase / MongoDB / MySQL / PostgreSQL
I am committed to delivering high-quality solutions tailored to your specific needs. Whether your project is in the early stages of discovery or fully underway, I can help you refine your ideas and build the application you deserve.
If you have a project or an idea you'd like to discuss, let's talk! I'm here to help you bring your vision to life.
I'm a multi-talented senior-level developer with a focus in webdev and Linux servers, and have experience working with various sorts of code on various projects. I have very strong troubleshooting skills, am adept at learning new tech, and have some secondary cybersecurity experience (such as conducting informal security audits).
I'm enthusiastic about sharing knowledge, am practiced at explaining how code works, and am eager to help people learn about programming!
Availability is typically 11am - 11pm local time (UTC+7), although I have an hour or two of flexibility on that.
Hi, I’m a senior software engineer with over 15 years of hands-on experience building real-world web applications using Ruby on Rails, React, JavaScript (Node.js), and SQL. I’ve helped early-stage startups launch quickly, modernized legacy systems, and mentored hundreds of developers through their coding journeys.
Now, I’m bringing that experience to Codementor to help you level up—whether you’re stuck on a bug, building your portfolio, or scaling a startup.
💡 **What I Can Help You With:**
→ Debugging tricky Web development-related issues
→ Code reviews + clean architecture feedback
→ Designing scalable backend and frontend solutions
→ One-on-one mentoring & pair programming
→ Career growth guidance for developers (interview prep, resume reviews, etc.)
→ Building MVPs and making smart tech stack decisions
→ Writing developer-friendly docs & onboarding flows
🚀 **Why Work With Me?**
I’m friendly, patient, and laser-focused on helping you make progress. Whether you’re a beginner looking for clarity or a founder needing quick technical direction, I tailor my approach to your specific goals.
Let’s solve your problem together, and make sure you walk away smarter, faster, and more confident.
🙌 **New to Codementor, Not New to Code**
While I’m new to Codementor, I bring 15+ years of real-world experience in Rails, React, and full-stack development.
If you’re one of my first clients here, you’ll get **discounted** sessions, extra support, and a chance to help shape this mentoring space with your feedback.
Let’s ship great code together—and build something awesome.
I am a software developer with years of experience and proven track record of accuracy and commended performance in modular and object oriented programming with dedicated and exceptional work ethic and passion.
Are you looking for a hands-on Full-Stack Architect who can build, scale, and support high-performance AI and SaaS platforms from the ground up? With over 10 years of professional experience—I specialize in architecting fast, secure, and resilient applications with real-time, AI-integrated capabilities.
**What I Bring to the Table**
🚀 **AI-SaaS Execution:** At MSBAI, I built the admin platform for the GURU Assistant, an LLM agent that diagnoses and fixes technical issues in scientific workflows. I’ve debugged AI-generated code, optimized ML pipelines in real-time, and translated LLM outputs into production-ready tooling.
⚙️ **Scalable Architectures:** From building live simulation UIs to secure multi-tenant marketplaces and 3D modeling SaaS apps, I’ve delivered systems that serve thousands of concurrent users with high availability.
🧠 **Full-Stack Mastery:** Expertise in TypeScript, React, Next.js, Node.js, Go, PostgreSQL, GraphQL, and low-latency backends using Rust and serverless functions on AWS and Supabase.
🛠 **Cross-Domain Versatility:** I’ve worked on platforms ranging from MLOps and scientific computing (MSBAI) to edtech mentorship networks (Scholarly) and cybersecurity labs (Xintra).
💬 **Developer Empathy + AI Support:** I’ve supported developers using AI agents by debugging generated code, writing CLI tooling, and guiding teams through adopting LLMs effectively in their workflows.
**Why Work With Me**
🔧 **End-to-End Ownership:** I thrive in fast-paced teams—leading system design, writing clean production code, and mentoring devs while delivering measurable impact.
🧰 **Startup-Ready Mindset:** I’m equally comfortable building MVPs from scratch or modernizing legacy systems to support scale and maintainability.
📈 **Proven Outcomes:** I've shipped everything from Slack-integrated dashboards and Gmail margin calculators to low-code builders and cross-platform mobile apps.
**Tech Proficiency**
* **Frontend:** React.js, Next.js, Tailwind CSS, React Native
* **Backend:** Node.js, Express, GraphQL, Rust (Axum), Python (FastAPI)
* **Data & AI:** PostgreSQL, Supabase, MongoDB, Redis, LLM workflows
* **Cloud & Infra:** AWS, Supabase, Docker, GitHub Actions, Vercel
* **DevOps & Testing:** Cypress, GitLab CI/CD, Terraform, observability stacks
**Industries Served**
* 🧪 ML/AI Ops (MSBAI)
* 🌐 SaaS & Developer Tools (Xintra, Scholarly)
* 🏥 Healthtech (Loop Health)
* 🎮 Gaming Platforms (Joyride, Kiwi)
* 🛍️ E-Commerce (GlowRoad)
Let’s collaborate—whether you’re scaling an AI-native SaaS platform, building a developer-first observability tool, or launching a privacy-first user experience, I bring speed, technical depth, and real-world execution.
Reza is an accomplished CTO and engineer with extensive experience in near-silicon design and problem-solving. He has done stream processing in all kinds of domains, using MQTT-SN, HL7 in healthcare, and mSEED and SEGY in earthquake analysis, utilizing a wide array of databases and programming languages. Passionate about building, Reza has maintained projects such as Ansible, universal-ctags, and QMK, and contributed to the Linux kernel and EDKII (UEFI).
I have over ten years of experience in software engineering. I’m excited about how technology creates meaningful experiences. My journey has taken me across various industries and countries. Each step enriching my understanding of how to build user-centric applications that resonate.
Recently, at Timeleap, I explored Web3. I also led the development of decentralized apps that generated revenue in a few months.
At Sonar, I played a pivotal role in the Clean as You Code initiative, where I joined as a pioneer member. This experience was rewarding. It simplified my understanding of CaYC. It also let me teach users about clean code practices, which I value and support! At Equip, I worked with my team to improve our app's rental processes. This helped us speed up prototype development by three months. Later, we published it to app stores, which increased our reach to users in Switzerland, France, and the US.
I love challenges. Right now, I’m excited to dive into .NET. I will also keep working with React and TypeScript. My past jobs gave me many skills. I developed consumer-first apps at Anibis. I also worked on Smart TVs at British Sky Broadcasting. Each role helped me adapt and innovate.
When I'm not coding on fun projects, I join local tech groups. I also check out open-source initiatives. Sharing knowledge is crucial in our field. I enjoy connecting with other developers to learn from their experiences.
Looking for someone who enjoys crafting meaningful solutions? Whether it’s full-stack development or front-end work, let’s connect! Email me if you’d like to chat about possible collaborations or share thoughts on tech trends. I have a strong interest in discussing all aspects of technology.
Email: andreyluiz.developer@gmail.com
Website: https://andreyluiz.com
Skills:
\- React
\- TypeScript
\- Node.js
\- Tailwind CSS
\- Next.js
\- SvelteKit
\- Web3 Development
I started my programming career creating line of business applications for investment banks and slowly transitioned into web development roles working with Ruby on Rails and Elixir/Phoenix.
I have experience working on high-profile web apps serving millions of active users and also smaller websites with modest traffic but terrific revenue.
For the past eight years, I've been working remotely for American companies, mainly doing web development and playing tech-lead roles in several projects.
I'm used to working with founders and CTOs, going from Plan A to Plan B to a plan that works.
I've helped companies build MVPs, scale projects, and maintain large-scale systems handling millions of requests a day.
I'm comfortable doing code reviews and pair programming sessions.
These are some web apps I've worked on in the past couple of years:
* [Canary Data (Elixir/Phoenix - React)](https://canary-data.com/)
* [Blitz (Elixir/Phoenix)](https://blitz.gg/)
* [Superkind (Elixir/Phoenix)](https://www.linkedin.com/company/superkind)
* [About Fresh (Elixir/Phoenix)](https://aboutfresh.org/)
* [AR Workflow (Ruby/Rails - Node.js)](https://arworkflow.com/)
* [SnapCell (Ruby/Rails)](https://snapcell.us.com/)
* [Walkboard (Python/Django)](https://www.walkboard.com/)
* [Sky Sports (Node.js - Python)](https://www.skysports.com/football)
I wrote [Data Structures From Scratch](https://www.amazon.com/gp/product/B07MZZT6SW), an ebook about creating essential, advanced, and persistent data structures using the Ruby programming language.
I live in Buenos Aires (UTC-3) with my wife and beautiful son.
If you made it this far, please check out [my resume](https://alemiralles.dev/alemiralles-resume.pdf) for a detailed version of what I've been doing.
Thank You!!
\- Debugging / Deployment / Annoying app dev issues – I love a good challenge 🛟
[https://www.richdackam.com](https://www.richdackam.com)
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Frequently asked questions
How long do Ruby on Rails projects normally take?
The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance Ruby on Rails project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance Ruby on Rails request on Codementor, check out our article.
How much does it cost to hire a freelance Ruby on Rails developer?
We don’t charge anything when you post a freelance hiring request for Ruby on Rails developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.
What makes Codementor Ruby on Rails developers different?
We do a comprehensive technical and communications screen of all Ruby on Rails developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing Ruby on Rails developers’ user satisfaction rates.
What happens if I’m not happy with the freelancer’s work?
As a platform, we strive to ensure you’re always happy with your Ruby on Rails project’s results. If you’re unsatisfied with the results, you can choose to get a refund for the project. Additionally, you can contact our support team should you need any further assistance with your project.
For more answers to frequently asked questions, see here.
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