Hire principal / staff freelance Ruby on Rails developers

As a seasoned freelance software developer, I bring extensive expertise in Ruby on Rails, React, JavaScript, TypeScript, and GraphQL. I have successfully delivered numerous projects, ranging from MVPs to complex systems serving millions of users. My specialization includes performance tuning, AI integrations, and product leadership. Known for being self-driven and easy to manage, I excel in hands-on coding and product ownership. Skills: Ruby on Rails Postgresql React TypeScript JavaScript GraphQL Server - Ruby GraphQL Client - Apollo CI/CD (CircleCI, Jenkins) Heroku

I excel at problem-solving, app design, and architecture. I like to develop user-friendly applications and follow new technologies.

Senior software engineer with over 10 years of experience as a remote freelancer. My educational background includes an MSc 2:1 in computer science and applied mathematics engineering from ENSEEIHT (Toulouse, France) in 2009. I then worked for 2 years as a frontend developer at a startup in London and transitioned to backend work in 2013. Specializing in web application development, I have undertaken projects for companies such as Carrefour, L'Oréal, Cocolis, Epicery, and Alerti. My work has encompassed backend development, data engineering, code and database performance improvement, e-commerce platform customization and logistics, payment system integration, API creation, crawlers, technical documentation, and testing. Passionate about data manipulation and rendering them to users and stakeholders in a more meaningful way, I am currently expanding my skills in AI/ML and neural networks through CNRS fidle formation to explore how I could apply and offer these services to my clients. Recent milestones and accomplishments include: Migrating the payment system from Adyen to Stripe for Epicery Migrating the frontend from Vue to Hotwire for Epicery Developing a geolocalized matching algorithm between carriers and packages for Cocolis Fields of expertise: E-commerce solutions with Solidus/Spree open-source framework Data processing and visualization with Business Intelligence tools for reporting Integration of payment system providers Integration of third-party APIs Database design and performance optimization Frontend performance optimization Crawling and scraping Technical audits Testing, documentation, CI/CD tools Experience with the following tools: Languages: Ruby, Typescript, JavaScript, Node.js, Ruby on Rails Platforms: AWS, Google Cloud Platform, Render, Heroku Frontend: React, Vue.js, Hotwire, Angular, HTML/CSS, Alpine.js, HTMX, Astro Payment providers: Stripe, Mangopay, Adyen, PayPal Data viz: Amazon QuickSight, Superset, Tableau Backend tools: Solidus open-source e-commerce solution, New Relic, Elasticsearch, PostgreSQL, Amazon S3, etc. CI/CD Tools: GitHub CI, CircleCI Fluent in French, English, and Spanish.

Hi, with 7+ years of experience as a Ruby on Rails and full stack developer, I excel in building dynamic and scalable web applications. My expertise spans across a range of JavaScript frameworks, including ReactJS, NextJS, NodeJS, NuxtJS, and VueJS. I combine my strong backend skills with modern frontend technologies to deliver seamless, high-performance solutions My journey started with a keen interest in technology and quickly evolved into working on complex projects. Recently, I led a team to build a scalable microservices-based application, which enhanced both user experience and performance. I’m also exploring serverless technologies, like AWS Lambda, to improve application efficiency. What makes me stand out is my ability to handle both frontend and backend development, solve tough problems, and create user-friendly solutions. My diverse skills and hands-on experience make me a strong addition to any development team. Let’s build something great together!

TLDR- I know Rails, let’s build together. I understand that the most important part of any project is getting it in front of users. I am the ultimate buy one get one free; a true full stack developer with years of experience working with Rails and React. Let’s leverage my skill set to get your idea from in your head to on the web. Skills Great knowledge of Ruby. Experienced Next/React user. Sidekiq expert. Domain Modeling. CSS (SCSS, StyleComponents, Tailwind, Bootstrap, Whatever is clever). API’s and Integrations are my jam. I am very familiar with the JavaScript ecosystem including modern React and the current rise of hypermedia on, over, or around the wire. From LiveView in Phoenix, to Hotwire and HTMX, I’ve hosted projects in each. Legacy Code I have experience working with large media organizations that managed many forms of media from digital to printed magazine. Magazine systems are archaic, and very brittle. I refactored America’s Test Kitchen’s subscription service, allowing for greater resilience and capture. I am currently working for an enterprise grade e-commerce platform. We leverage Rails (Sidekiq) and process ~billion jobs a day.

My values are collaboration, empathy, and work ethic. I've been working in Ruby on Rails for 10 years, and have seen a variety of different industries and different products. I focus on delivering quality products on-time and under budget. Reach out to discuss your needs!

I'm a senior software developer with about 15 years of extensive hands-on experience and a demonstrated ability to deliver high-quality results. I have expertise in multiple cutting-edge web application frameworks, specifically, Ruby on Rails and Node JS. I also have good hands in frontend Javascript frameworks React JS and Angular JS. I've recently worked with the RightInbox, a high-ranking Productivity application / Google Chrome Extension with a 4.7 rating on the Chrome Store and a feature by Google, was a project where I started as a developer and grew to become the Engineering Manager. During my time on the project, I used my advanced knowledge of Node JS to enhance the product's functionality, increase its user base, and ensure its smooth operation. Simultaneously I developed the ZoomShift platform, a scheduling software built on Ruby on Rails. Here, my role was about active development however more focused on strategic technological choices and project delivery. Zoomshift is well-regarded for its efficiency and was even utilized during the US elections to manage the shifts of volunteers. I've worked with FindEmails, which finds and verifies emails while you are on LinkedIn or browsing the web with the FindEmails Chrome Extension. Skills:- - Solutions - Optimization and Performance - Scalability - Architecture - Ruby on Rails - NodeJS - ExpressJS - ReactJS - AngularJS - Bootstrap - SQL, PostgreSQL, NoSQL, DynamoDB, MongoDB, MariaDB, MySQL, Redis - Stimulus - Integration of all levels of APIs - Selenium, RSpec, Mocha, Mini Test, Chai.JS, Sinon.JS - Digital Ocean - Heroku - Render - Action Cable and Web Sockets - JavaScript, jQuery, jQuery UI, CoffeeScript, TypeScript - HTML5, HAML, Slim - CSS, SCSS - GCP, AWS, Heroku - EC2, S3 - Puma, NGINX, Capistrano - Elastic Search, Algolia - GIT - CI/CD - Jira - Trello - Asana

Great at refactoring, audit and developing of legacy apps as well as building apps from scratch with modern Ruby and Rails. Focused primarily on back-end, having an understanding of front-end as well. A fan of DRY, DSLs, Rails Engines and Active Record. Not a big fan of SPA, micro-services as well as extensive front-end development or DevOps chores. Can bring your decade old outdated MVP back to life step by step without rewriting it from scratch or hiring a new team. Normally you have two choices: 1) a legacy team considering their creation to be great as it is or 2) a new one telling you that the app should be thrown in the trash and replaced with a brand new one using their hyping shiny tools. Able to learn your legacy app in days — without a documentation or help of former developers if abandoned. Can learn your favorite frameworks on my own and jump in fast. Can use a lot of secondary languages for audit or bug-fixing on an occasional basis. Audit Refactoring Optimization Code review Application architecture Team leading Mentoring Experienced in working with international fully remote teams. English: C1 Spanish: A2

Hi, If you’re looking for someone who can hit the ground running, dive deep into challenges, and come up with creative solutions, then you’ve found your match. Located in Santa Clara, CA. The key features of my experience: · BS and MS in Computer Science. · 8+ years of experience in on . · 5+ years of experience in & – React, Node, Angular & Vue. · Proficient in , AI/ML & Data Analytics. · Competent in platforms (, GCP, Heroku, Datica, Docker, Kubernetes), databases (PostgreSQL, MySQL, and MongoDB) and version control (Git). · Project Management Tools: Jira, Confluence, GitHub, GitLab & Bitbucket. · Testing Tools: Selenium, Jenkins & Cypress. LinkedIn – https://www.linkedin.com/in/s%C3%A5m-a%C3%BAstin-619a2b320/ GitHub - https://github.com/usmanasif Some of my best work: Intellirent - https://www.myintellirent.com SaplingHR - https://www.saplinghr.com Concert - https://www.concertfinance.com Trakstar - https://www.trakstar.com Movr - https://www.movewithmovr.com/ I have led more than 10 projects from conception to deployment, and have mentored 20+ junior developers in the process. I have diverse experience working with various industries including health-tech, , education, e-commerce, ERP & SaaS. I’m excited to get to know you more and proceed with the next steps in the hiring process. Have a great day! Sam

I am a seasoned software engineer and architect with 25+ years of experience in the industry. I have a passion for software design and am driven by my love of technology. Over the course of my career, I have honed my skills in both frontend and backend development and have worked with a variety of technologies and platforms, including Ruby on Rails, React, AWS, NodeJS, Postgres, MySQL, and more. My expertise in agile software development and DevOps has resulted in a proven track record of delivering successful projects. I am an advocate for Test Driven Development (TDD), the Minimal Viable Product (MVP) approach, and pair programming. These practices have not only helped me build high-quality software solutions, but have also served as a means of mentoring and leading teams. I have also made significant contributions to cost-saving measures, such as reducing AWS spend by 60% through optimization, autoscaling, and scaling services only when required. I have also helped improve code quality through unit testing, peer reviews, and implementing CI/CD pipelines. In my roles, I have worked closely with clients, stakeholders, and cross-functional teams to understand requirements and deliver scalable software solutions. My experience in iterative and full lifecycle development for Internet, commercial, distributed, and n-tier solutions has allowed me to play a vital role in the completion and launch of many successful projects. Overall, I am a highly motivated and skilled software engineer and architect, with a passion for great software design and a proven track record of delivering successful projects.