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Freelance Ruby on Rails Developer - Kirill Erokhin
Freelance Ruby on Rails Developer5.0 (233 reviews)

I am a senior full-stack & DevOps developer with a track record of maintaining distributed infrastructure, recent deep experience in large-scale data pipelines and a growing skillset and interest in applied AI/LLM integration. My recent work at an e-commerce search engine startup had me building and maintaining scrapers and a data pipeline that ingested over 10M product SKUs into an OpenSearch index, which was used for hybrid vector+lexical product search, enriched with LLM signals extracted as part of the pipeline. I've used reranking techniques like RRF to enhance relevance after retrieval, and RAG/grounding for features that answered personalized user queries with recommendations grounded in real customer reviews. My earlier work was heavily full-stack and always involved infrastructure where I often built and supported systems end-to-end, very often in context of a regulated market - with great examples like Deckard (PropTech/GovTech), Sick Children's Hospital/RareConnect (Healthcare-adjacent), and Ethoca \[now MasterCard\] (FinTech). I've also led IaC initiatives at Ethoca (Chef/Ansible, in 2016-17), and even implemented IaC from scratch for two startups - Pastel Labs (Terraform automation of AWS infrastructure for a B2B SaaS and a tutoring marketplace, in 2021), and Rilara (Pulumi for AWS infrastructure of their e-commerce product, in 2025-26). My startup experience is proven track record of working independently, but I also thrive as part of a team, with most recent example of being part of Deckard's distributed remote engineering team of 25+ people spread across the US and Australian timezones. Claude Code is part of my everyday workflow, and I am happy to consider myself a relatively-older senior developer who has successfully adapted to an AI-assisted/AI-first SDLC without compromising the quality of my work. I would be very excited to continue my journey with an opportunity in healthcare or finance, where I could apply my IaC skills while continuing to explore the world of LLM applications to improve user experience in these regulated environments. Should you have any questions about any of the background I mentioned here or on the attached resume, I would be glad to answer them in an interview at a time of your convenience. Thank you!

Freelance Ruby on Rails Developer - Muhammad Hassan
Freelance Ruby on Rails Developer

Greetings! My name is Muhammad Hassan and I am thrilled to be a **Full Stack** Engineer hailing from the beautiful city of Lahore, Pakistan. With five years of solid experience in the software development industry, I am eager to share my passion for technology and innovation with you. Currently, I am working as a **Frontend Engineer** for Stadim Data, where we are developing cutting-edge products and tools to digitalize the workflows for real estate valuation. I work **remotely**, but the work we do is as exciting as if we were in the same office! I am proud to have completed my Bachelor's degree in Computer Science from the renowned University of the Punjab. In my career, I have had the pleasure of working with a diverse array of companies, ranging from small to medium-sized businesses and startups, which has given me a broad perspective on the industry. Throughout my journey, I have honed my skills in various programming languages and frameworks, including the **React Js, Next Js, Node Js, Graphql, Typescript**, and many more. I look forward to sharing my expertise with you and working together to bring your innovative ideas to life!

Freelance Ruby on Rails Developer - Jon Chui
Freelance Ruby on Rails Developer

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.

Freelance Ruby on Rails Developer - Owais Jamil
Freelance Ruby on Rails Developer

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.

Freelance Ruby on Rails Developer - Uzair Faisal
Freelance Ruby on Rails Developer5.0 (51 reviews)

I'm a **polyglot fullstack software developer** (*I'm able to effectively work with multiple languages, tools, and frameworks*) with over 13+ years of industry experience in web application development. I'm also an instructor and mentor in various bootcamps having lead class cohorts, mentored groups of students and 1:1 tutoring sessions. I'm experienced in **Python**, **ECMAScript** (Javascript or Node.js), **Java**, **C#** **Ruby**, **PHP**, and even **Scala**. I work in both frontend and backend spectrums of the web stack, so whether you're debugging something in React.js or you're stuck on a complex SQL query, I'm more than happy to help in your code debugging adventures. My instruction style is that I like to guide the student towards learning *how* to solve rather than simply giving you the solution - I don't believe a student should be stuck on always referring back to a senior developer to get unblocked, but should be empowered to solve their own problems. Now that's real mentorship!

Freelance Ruby on Rails Developer - Nick ottrt
Freelance Ruby on Rails Developer5.0 (20 reviews)

Senior software engineer with 5+ years of experience in backend web technologies including Ruby on Rails, Python, Go, and MySQL. Currently at Tesla, previously EasyPost. Bachelor's in Computer Science. Main strengths include architecting applications and backend API development, have also worked in fullstack roles. The best part of software engineering is that you never stop learning new things.

Freelance Ruby on Rails Developer - Carlos Aguilar
Freelance Ruby on Rails Developer4.9 (67 reviews)

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.

Freelance Ruby on Rails Developer - Luis López Hernández
Freelance Ruby on Rails Developer5.0 (1 reviews)

My name is Luis de Jesús López Hernández, and I'm a 40-year-old Web Applications Engineer and Game Developer. I'm based in Mérida, Yucatán, México. My academic background includes a Master's Degree in Design and Comprehensive Development of Videogames from UNIAT University of Advanced Technologies (2020-2022). Before that, I earned an Engineering in Strategic Information Systems from the University of Mayab (2002-2006). Artificial Intelligence & Process Acceleration: I am currently assisting the company in the area of Artificial Intelligence, specifically by accelerating processes in administrative matters and in software development. I utilize 'vibe coding' for this purpose and implement Agents for certain processes.

Freelance Ruby on Rails Developer - Eduardo Nakanishi
Freelance Ruby on Rails Developer

I have 8 years of professional experience with software development mostly with Ruby on Rails, React and AWS. In my latest role as a staff software engineer I had the responsibility of keeping our platform performant and resilient while guiding a cross-funcional team of software engineers, designers, and product members to achieve company wide goals.

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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.

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