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Top freelance Ruby on Rails developers available to hire
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 product-driven Senior Front-End Engineer with 10+ years of experience. I help engineers level up their frontend engineering and architecture skills through clear, hands-on mentoring.
I’m a senior mobile + backend engineer with 20+ years in software (PHP since 2002; professional since 2005) and 10+ years building mobile apps. I help teams ship and stabilize real products—especially apps that are “almost done” but stuck on crashes, performance, flaky networking, or release blockers.
What I can help you with (fast, practical):
• iOS (Swift, SwiftUI, UIKit): crash fixes, performance/memory, concurrency issues, architecture cleanup
• Flutter (iOS/Android/macOS): reliability, state consistency, networking/retry behavior, release readiness
• Backend stability (PHP/Laravel or custom, Python/Django, Rails): idempotency, queues, DB performance, webhook safety
• Firebase + mobile reliability: Auth/Firestore rules, Cloud Functions patterns, analytics/instrumentation
• Monetization + shipping: RevenueCat/IAP reliability, App Store Connect/Play Console, CI/CD, rejection handling
Recent work includes taking a messy iOS codebase (CakeClub) to production-ready with a Firebase Cloud Functions v2 backend, stronger security patterns, CI/release automation, and RevenueCat integration; and delivering major cross-platform Flutter work (BillBlaster) including design refinements, admin tooling, and push notification features.
If you come with logs/screenshots (Crashlytics traces, network errors, repro steps), I’ll give you a clear diagnosis and a prioritized fix plan—and if it makes sense, I can execute the fixes as a focused sprint.
If you need any assistance with a project or for mentoring, feel free to reach out. I'll do everything I can to make your project a success.
Over the years many developers have helped me learn and improve. So, I'd like to do the same for others.
I've done work for Shopify, Samsung, BP, Aldo, and many others. I've got a lot of real world experience developing useful software. My focus has always been writing simple code that easy to understand and maintain.
I’m a Technical Lead and Full-Stack Developer with 17+ years of experience delivering robust web applications and SaaS platforms. I have led engineering teams through complex projects, balancing hands-on development with mentoring and process improvements to consistently meet aggressive deadlines. Notably, I helped scale infrastructure and improve performance for SaaS products used by tens of thousands of users. I excel at driving feature delivery end-to-end—whether implementing APIs, optimizing workflows, or guiding teams—as a dependable executor and problem solver.
### About me
I’m a **Staff-level Frontend and UI Engineer** with **13+ years of combined professional and teaching experience**, specializing in **UI engineering**: Design Systems, enterprise CSS, responsive layouts, accessibility (WCAG), data visualization, and web animations — with deep expertise in **React, JavaScript/TypeScript, HTML, and CSS**.
Throughout my career, I’ve consistently operated as **the bridge between Design and Engineering**, translating ambitious visual and UX goals into **scalable, performant, and accessible frontend systems**. My work focuses on aligning design intent with real-world engineering constraints while maintaining long-term maintainability and code quality.
I’ve led and contributed to **Design System initiatives**, built **data-visualization–heavy charts, tables, and UIs**, improved **localization workflows**, and helped raise **UI standards across critical user flows** in large, high-impact products. A recurring part of my work involves **untangling legacy stylesheets** and transforming them into **clean, enterprise-grade CSS and component architectures**.
In addition to hands-on engineering, I bring **5.5 years of experience as a Udacity mentor**, where I guided developers through frontend, UI, and JavaScript projects, reviewed real-world codebases, and helped engineers progress from fundamentals to **production-ready practices**. I mentor because I enjoy helping developers move beyond surface-level fixes and truly understand **why UI breaks** — whether it’s layout mechanics, rendering behavior, accessibility pitfalls, or component design.
I'm Jon and I love mentoring junior engineers!
For 10+ years I lived & breathed 📱mobile.. worked on top 10 App Store apps (Google Maps, Gmail, Google search) as well as a bunch that didn't see the light of day. The pressure took it's toll finally & I followed the "burnout track" and took 6 month sabbatical (that would later turn into almost 3 years). My family & I left the bay with 8 suitcases of all our belongings, and i thought tech would only be in my rear view mirror...
I exchanged the standup desks & nap pods of silicon valley to serve families in the slums of Philippines & Cambodia. To my utter surprise and delight though, these families were happier than I was. Something was missing?
We came back to the mainland & I tried my hand at using tech for good, by working on the "strava for sobriety" app and it was amazing. I was finally helping ppl again!
But as w/ many startups, funding fell through...
I then went to help a big, well-funded startup who's goal was "tech for good", specifically in non-profit church space. I was so excited! And somehow, in the midst of "strat sums" and super fun budgets I lost my way... I actually kind of lost heart.
Hey there! I'm Owais Jamil and I’m a software engineer with roots in New England and Austin, TX. Right now I’m enrolled as a master’s candidate at the University of Texas, most recently worked as a senior backend engineer at Edlink. I have experience working on mobile and web apps, and have tutored and taught others in the past.
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.
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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.
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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?
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