I'm a seasoned Ruby on Rails developer with 7+ years of hands-on experience delivering high-performance web applications across diverse industries. My expertise spans the full development cycle, from crafting robust backends to building sleek, responsive UIs. 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐫𝐢𝐧𝐠 𝐭𝐨 𝐭𝐡𝐞 𝐓𝐚𝐛𝐥𝐞: - Ruby on Rails Mastery – Scalable, maintainable, and efficient backend solutions - React.js & JavaScript – Dynamic, interactive, and intuitive frontends - Modern UI/UX – HTML5, CSS3, Tailwind CSS, Bootstrap & Materialize - Hotwire & StimulusJS – Turbocharged interactivity without the JavaScript bloat - Search Optimization – Elasticsearch & Solr for fast, intelligent querying - Database Expertise – MySQL, PostgreSQL & MongoDB for data-driven applications 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐤𝐢𝐥𝐥𝐬 - Programming Languages: Ruby, JavaScript, SQL - Web Frameworks & Technologies: Ruby on Rails, React, HTML, CSS, Tailwind CSS - Databases & Caching: MySQL, PostgreSQL, Elasticsearch, Redis - Version Control: Git, GitHub - Testing & QA: RSpec, Capybara - CI/CD & Deployment: Jenkins, Capistrano - Project Management Tools: Trello, ClickUp I thrive on problem-solving, performance optimization, and delivering clean, maintainable code. Whether you're looking to build a new project from scratch or optimize an existing one, I'm here to help! 📩 Let's discuss your project—message me today!

I focus on developing myself both professionally and personally, in order to acquire greater knowledge and experience in Software Development.

✔️ 𝐓𝐨𝐩-𝐑𝐚𝐭𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 ✔️ 𝐑𝐮𝐛𝐲 𝐨𝐧 𝐑𝐚𝐢𝐥𝐬, 𝐑𝐞𝐚𝐜𝐭, 𝐍𝐨𝐝𝐞, 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐄𝐥𝐢𝐱𝐢𝐫, 𝐏𝐡𝐨𝐞𝐧𝐢𝐱, 𝐕𝐮𝐞.𝐣𝐬 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐬𝐭 ✔️ 𝐄𝐥𝐢𝐱𝐢𝐫, 𝐏𝐡𝐨𝐞𝐧𝐢𝐱 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 ✔️ 𝟖 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐏𝐫𝐨𝐟𝐞𝐬𝐬𝐢𝐨𝐧𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 ✔️ 𝟏𝟎𝟎+ 𝐖𝐞𝐛 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐝 As a senior Full Stack Developer with over 8 years of experience, I specialize in building scalable, high-performance web applications. My expertise spans across 𝐑𝐮𝐛𝐲 𝐨𝐧 𝐑𝐚𝐢𝐥𝐬, 𝐑𝐞𝐚𝐜𝐭.𝐣𝐬, 𝐍𝐨𝐝𝐞.𝐣𝐬, 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐄𝐥𝐢𝐱𝐢𝐫, 𝐏𝐡𝐨𝐞𝐧𝐢𝐱, 𝐚𝐧𝐝 𝐕𝐮𝐞.𝐣𝐬, ensuring top-quality, end-to-end solutions that are tailored to meet your business goals and enhance user experience. Whether it's starting a web application from scratch or working on an existing one, I ensure the final product is strong, easy to use, and visually appealing. 𝐌𝐲 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 𝐈𝐧𝐜𝐥𝐮𝐝𝐞𝐬: ✔︎ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Ruby on Rails, NodeJS, Express.js, Elixir, Phoenix, REST API development ✔︎ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React.js, Next.js, Vue.js, Angular.js, JavaScript, HTML5/CSS3, Bootstrap ✔︎ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: MongoDB, PostgreSQL, MySQL ✔︎ 𝐖𝐨𝐫𝐤𝐟𝐥𝐨𝐰 𝐓𝐨𝐨𝐥𝐬: GitHub, Jira, Trello, Asana 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐈 𝐎𝐟𝐟𝐞𝐫 𝐚𝐬 𝐚 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫: 👉 Full web development solutions using 𝐑𝐮𝐛𝐲 𝐨𝐧 𝐑𝐚𝐢𝐥𝐬, 𝐄𝐥𝐢𝐱𝐢𝐫, 𝐏𝐡𝐨𝐞𝐧𝐢𝐱. 👉 Custom web application development tailored to your business needs with Ruby on Rails. 👉 Complete 𝐌𝐄𝐑𝐍 𝐬𝐭𝐚𝐜𝐤 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭. 👉 Web app development using 𝐑𝐞𝐚𝐜𝐭.𝐣𝐬, 𝐍𝐨𝐝𝐞.𝐣𝐬, 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐚𝐧𝐝 𝐕𝐮𝐞.𝐣𝐬. 👉 API development for mobile and front-end applications. 👉Frontend development with 𝐇𝐓𝐌𝐋, 𝐂𝐒𝐒, 𝐑𝐞𝐚𝐜𝐭.𝐣𝐬, 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐚𝐧𝐝 𝐕𝐮𝐞.𝐣𝐬. 👉 Design translation from Adobe XD, PSD, Figma, or Sketch to 𝐇𝐓𝐌𝐋, 𝐂𝐒𝐒, 𝐑𝐞𝐚𝐜𝐭.𝐣𝐬, 𝐍𝐞𝐱𝐭.𝐣𝐬, 𝐚𝐧𝐝 𝐕𝐮𝐞.𝐣𝐬. 👉 E-commerce and web portal development. 👉 Payment gateway integration (Stripe, Authorize.net, PayPal, etc.). 👉Website Development using Node.js, Next.js, MongoDB, MERN Reach out today to discuss your project and see how we can create something amazing together! Thank you for visiting my profile. Let's connect to discuss your project in detail. Regards, Bhanwar Singh 𝐏𝐫𝐨𝐟𝐢𝐥𝐞 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Full Stack Developer, Ruby on Rails Developer, React Developer, Node.js Developer, Next.js Developer, MERN Stack, Elixir, Phoenix, Vue.js Developer, Custom Web Application Development

Enthusiastic Ruby on Rails developer experienced working with several successfully funded startups. Have whole experience with building, maintaining, scaling web projects by using Ruby on Rails. It has been my privilege to work with big companies and startups. **Backend Development** ----------------------------- - Ruby on Rails (Devise, CanCan, Paperclip, OmniAuth, Capistrano, etc.) - AWS, Heroku, Digital Ocean - Redis, Sidekiq, DelayedJob - MySQL, PostgreSQL, Firebase, Mongo DB - REST API, APIs/OAuth Facebook, Twitter, Google, Instagram, Pinterest, Tumblr, etc. - Payment integrations: Stripe, PayPal, Braintree * Open source LLMs: Llama 2, Falcon, Mixtral, NeoX and more. * LLM development: prompt engineering, fine-tuning, deployment * Custom LLM-based software: LangChain, LlamaIndex, Python, FastAPI and Django **Frontend Development** ----------------------------- - React.js, HTML5/ CSS3/SASS, Web UI/UX Design, Twitter Bootstrap - Javascript/Jquery, D3.JS **Domain Expertise** ----------------------------- ★ Enterprise Application ★ Shopify apps / plugins ★ Business Automation ★ Web & Enterprise Portals ★ E-learning & Training ★ Omnichannel E-commerce; Marketplace & Collaboration ★ Content & Document Management ★ Healthcare management ★ Social media ★CRM Solutions Good knowledge of - Gems, Git, design patterns, refactoring

I’m a Ruby on Rails developer/engineer with 3+ years of hands-on experience in building scalable, high-performance web applications. I specialize in clean architecture, well-tested code, and smooth third-party integrations that make platforms efficient and maintainable. What I Bring to Your Project -Backend Mastery: Ruby on Rails, Grape APIs, ActiveAdmin, RSpec, Capybara -Front-End Skills: ReactJS, Angular 2, jQuery, React Native + Expo -Tech Stack Expertise: PostgreSQL, MySQL, Redis, Docker, WebSockets -Integrations: Stripe, PayPal, Google Maps API -Localization: PhraseApp, Globalize for multi-language support Whether you need to build a robust API, integrate payment systems, optimize an existing codebase, or create a cross-platform app, I’m here to help you bring your product to life—efficiently and cleanly. Let’s build something great together!

🥇 Trusted by founders from renowned incubators and accelerators such as 𝙔-𝘾𝙤𝙢𝙗𝙞𝙣𝙖𝙩𝙤𝙧, 𝙁𝙪𝙩𝙪𝙧𝙚𝙇𝙖𝙗𝙨, 𝙍𝙚𝙥𝙪𝙗𝙡𝙞𝙘 𝙤𝙛 𝙒𝙤𝙧𝙠, 𝙖𝙣𝙙 𝙁𝙤𝙪𝙣𝙙𝙚𝙧𝙨𝙁𝙖𝙘𝙩𝙤𝙧𝙮 💸 €𝟭+ 𝗺𝗶𝗹𝗹𝗶𝗼𝗻 in funding 𝗿𝗮𝗶𝘀𝗲𝗱 by partner founders who chose my development expertise ✅ 𝟳+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 ✅ 40+ Projects ✅ Native English Communication Skills ⚡ Rapid Delivery | ☎ On-Demand Support ✅ 40+ Successfully Completed Projects ⭐️ 1000+ hours worked 📞 Experience the difference with a 𝙣𝙤-𝙘𝙤𝙨𝙩 30-𝙢𝙞𝙣𝙪𝙩𝙚 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝘁𝗶𝗼𝗻 designed just for you! Hello! 👋 I'm a skilled Senior Full-stack Engineer with 7+ years of hands-on experience. Specializing in SaaS app development, I've partnered with startup founders from leading incubators & accelerators worldwide, including Kayna (Kayna recently secured €1 million in funding following the completion of our initial development phase), Y-Combinator and FoundersFactory ➤ Core Technical Aptitudes: Frontend Development: ☑ Frameworks & Libraries: React.js (including Redux, Redux-Thunk/Saga, Formik), Next.js, Vue.js, Nuxt.js ☑ Languages & Technologies: ES6/7/8, TypeScript, D3.js, HTML5, CSS3 (LESS, SASS), TailwindCSS, Styled-components, Twig, Canvas ☑ UI/UX Tools: Figma, Zeplin, Adobe XD, Sketch, InVision UI Frameworks: Bootstrap, Material UI, Kendo UI, Ant Design, Chakra UI Backend Development: ☑ Languages & Frameworks: Node.js (Express.js, Nest.js), Python (Django, Flask), PHP (Drupal, Laravel, Codeigniter), C# (ASP.NET), GraphQL/Apollo ☑ Tools: Webpack, Gulp, TravisCI Database & ORM: ☑ Databases: MySQL, PostgreSQL, MongoDB, Firebase Cloud Firestore, AWS DynamoDB ☑ ORM Libraries: TypeORM, Prisma, Sequelize, Mongoose, Entity Framework Cloud & DevOps: ☑ AWS Services: S3, EC2, Amplify, Lambda, API Gateway, SQS, SNS, Textract, Quicksight, VPC, RDS, Cloudfront, and more ☑ Other Platforms: Digital Ocean, Azure, Google Cloud Platform, Heroku Testing & Payment Integration: ☑ Testing Tools: Jest, Mocha, Cypress, unittest ☑ Payment Services: Stripe, PayPal, Apple Pay, Google Pay, and more Advantages of partnering with me: ✅ I'll handle all the technical challenges for you, freeing up your schedule to focus on serving your clients, pursuing your passions, and cherishing moments with your family. ✅ Your project's triumph is paramount to me, and I'm committed to employing every effort necessary to provide you with a successful solution. ✅ You'll have direct access to contact me for 12 hours every day. ✅ Expect responses to technical inquiries or issues within one hour during working hours. What can I deliver 📦 with perfection. 🎯 Create high-quality landing pages, that will WOW your audience and exponentially increase conversions. 🎯 Create applications that require a logical approach to programming, such as a smart decision tree stepper, or a form-heavy page. 🎯 Lead a remote development team, utilising task management tools and the latest software development technologies. 🏅 Client Reviews that Speak for Themself. "Kumail is hard-working, fast and never skips on the quality of his work. I had a great time working with him, and will definitely recommend him to anyone looking to hire a highly experienced React developer" "Kumail stands out from the crowd, he really knows his craft well and very willing to go above and beyond. He's also patient and great at communicating. I'll hope to work with him again." If you're serious about getting quick prototypes up and running, or even looking to polish your existing large-scale application, hiring me will be the best decision you would make❕ 𝗚𝗿𝗲𝗲𝗻𝗳𝗶𝗲𝗹𝗱 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 / 𝗖𝘂𝘀𝘁𝗼𝗺 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 ✅ Full Stack Development for Marketplaces and Booking platforms ✅ Full Stack Developer for Admin Panel Development ✅ Full Stack Development for Livestream and Live video / call / chat platforms ✅ Full Stack Development with SaaS Integrations ✅ Full Stack Development with E-Commerce ✅ Full Stack Development with Marketing Pages ✅ Full Stack Development for High Conversion Landing Pages ✅ Full Stack Development for Stock or Crypto Solutions ✅ Full Stack Development for LLM / OpenAI / ChatGPT Solutions ✅ Full Stack Development for Real Estate Platform ✅ AWS Cloud Development for Robust End to End Systems ✅ AWS Cloud Development for High Performance Applications …𝗮𝗻𝗱 𝗺𝗼𝗿𝗲! With so many inexperienced developers, recent boot-camp graduates, and code monkeys sending job proposals left and right, the freelancer hiring process can be cumbersome. 😣 Allow me to make things easy for you, by enabling you to get the BEST 👌freelancer experience you can get from a web developer on Upwork. 📣 - Reach out and let's figure it out together :)

I am a full-stack Ruby on Rails developer with extensive experience in a wide variety of business areas, including online advertising, healthcare, real estate, fintech, cloud automation, and more. I write clean, modular, well-documented code with security and scalability in mind and help create simple, friendly, accessible user interfaces. I also contribute to open-source platforms like Sharetribe, Spree, and Discourse. My Complete Technical abilities are: -Ruby, Ruby on Rails, Node.js (express and koa) Elixir/Phoenix -React/Redux/Mobx, React Native, Vue.js. -Javascript | CSS (with Sass, Stylus and postcss ) | HTML (erb, Haml, Jade, Slim, JSX) -MongoDB, PostgreSQL, MySQL -Third-party API: Google Map API, AWS, Digitalocean API, GitHub API, Facebook, Twitter, Vk.com, and so forth. -Web-servers arrangement: Linux, Nginx, PostgreSQL, Passenger, Rails, Node.js I am following Agile/Scrum methodology in development. Also, I am using version control systems like Bitbucket, GitHub, and SVN. During my development career, I have used project management tools like Asana, Jira, and Some others and am widely open to adopting any new tool for betterment and transparency. I am accessible to offer Technical meetings/Tests. Kindly let me know whether you're intrigued, I couldn't imagine anything better than to set up a brisk introduction visit/call at your helpful time. Simply converse with me once we can improve understanding and can cooperate for a long-lasting. What's more, the most ideal approach to begin work and have trust in one another is by simply giving a couple of 5 to 7 hours of work, and in the event that you are fulfilled with that work, we can proceed for long-term work relationships. I developed many projects through Ruby on Rails and progressed nicely. If you're looking for a dedicated Ruby on Rails developer who can contribute to your team's success and deliver exceptional results, I would love to connect and discuss how we can work together. Thank you for considering my profile. I look forward to the opportunity to contribute my skills and expertise to your projects.

𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 - 𝗨𝗽𝘄𝗼𝗿𝗸 𝗥𝘂𝗯𝘆 𝗼𝗻 𝗥𝗮𝗶𝗹𝘀/𝗥𝗲𝗮𝗰𝘁 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 ⭐️ Senior developer (8+ years of experience) ✅ 7000 + hours on Upwork! ✅ Exceptional English Conversation skills ✅ 100% Client Recommendation ✅ 100% Quality The tech stack that I’ve extensive hands-on experience with: ✅𝗙𝗿𝗼𝗻𝘁-𝗲𝗻𝗱 React | Vue.js | Bootstrap | Tailwind CSS | JavaScript/jQuery | Stimulus | Turbo | Hotwired | UX/design SEO ✅𝗕𝗮𝗰𝗸-𝗲𝗻𝗱 Ruby on Rails | Rest API | GraphQL | Hotwire ✅𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 MySQL | MongoDB | PostgreSQL ✅𝗖𝗹𝗼𝘂𝗱 AWS | Heroku | Docker ✅𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗚𝗮𝘁𝗲𝘄𝗮𝘆𝘀 Stripe | PayPal | Google APIs ✅𝗩𝗲𝗿𝘀𝗶𝗼𝗻 𝗖𝗼𝗻𝘁𝗿𝗼𝗹 GitHub | Git | Gitflow | GitLab ✅𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 Kanban | Scrum | Agile Whether you're a startup looking to kickstart your MVP, an enterprise needing custom solutions, or a business aiming to optimize your existing application, count on me to be your go-to collaborator. Together, let's turn your ideas into reality and propel your business forward. Feel free to reach out today to discuss your project requirements—𝗜'𝗺 𝗲𝗮𝗴𝗲𝗿 𝘁𝗼 𝗹𝗲𝗻𝗱 𝗮 𝗵𝗮𝗻𝗱 𝗮𝗻𝗱 𝗵𝗲𝗹𝗽 𝘆𝗼𝘂 𝗮𝗰𝗵𝗶𝗲𝘃𝗲 𝘆𝗼𝘂𝗿 𝗴𝗼𝗮𝗹𝘀.

Full Stack Developer with 7+ years of experience building scalable web platforms, SaaS products, APIs, and AI-powered applications using Ruby on Rails, Node.js, React.js, and modern cloud technologies. I help startups and businesses develop high-performance applications from concept to deployment — whether it’s a custom web platform, backend architecture, mobile app backend, third-party integrations, or AI-driven software. My expertise includes: • Ruby on Rails & Node.js development • Full Stack web application development • React.js, Vue.js, JavaScript • RESTful APIs & backend architecture • PostgreSQL, MySQL, MongoDB • AWS, Docker, Heroku, CI/CD • AI-powered applications & LLM integrations • LangChain, LlamaIndex, FastAPI, Python • OpenAI & open-source LLM integrations I focus on clean architecture, scalable systems, performance optimization, and delivering reliable long-term solutions that align with business goals. Available for: • SaaS product development • Startup MVP development • Backend/API development • AI-powered app development • Existing application enhancement & scaling • Long-term development support Let’s build scalable and impactful software solutions together.

Hey there, Thanks for stopping by. You look gorgeous today! Let's do some serious development, so here it is: ### Summary CTO/Senior full-stack engineer with 15+ years building and scaling complex Rails applications end-to-end: product planning, rapid delivery, performance tuning, secure architecture, and production ops. I own outcomes - from first sketch to reliable, observable, autoscaled production running in the cloud. At this moment, over 2 years AI experience, not just "do it", but with understanding how it works under the hood. Just created an AI-driven inventory management app: AzinvSpace, take a look in the portfolio. ### Core strengths * A-Z Delivery: turn fuzzy requirements into clean plan, then to tested Rails features, nice and fast code. * Scalability & performance: Tune with PostgreSQL/Redis, background jobs, caching, N+1 eradication, P95/P99 focus * API design: resilient REST/GraphQL, rate-limiting, idempotency, and observability * Security: OWASP mindset, secure auth (Devise/OAuth2/OIDC/JWT), secrets hygiene(plus a bit more security stuff) * DevOps: Dockerized apps, zero-downtime deploys, repeatable infra, clear runbooks & alerts ### Modern stack, just the most used. I tried to narrow it down, feel free to skip this part :D * Backend: Ruby 3.x, Rails 7.x, Hotwire (Turbo/Stimulus), ViewComponent, Sidekiq, ActionCable * Data: PostgreSQL (13–16), Redis, Elastic/OpenSearch (search & logs) * Frontend: React/Next (when appropriate), Tailwind CSS * Testing/Quality: RSpec, Capybara/System tests (Selenium/Chrome or Playwright), FactoryBot, VCR, RuboCop, Brakeman * CI/CD: GitHub Actions (preferred), CircleCI; containers with Docker/Compose; deploys with Kamal (current) and Capistrano (legacy) * Cloud & edge: AWS (RDS, ECS/ECR, S3, CloudFront), Render, DigitalOcean; NGINX/Traefik * Observability: Sentry, Lograge, Prometheus/Grafana, OpenTelemetry (where supported) * Integrations: Stripe, Twilio, SendGrid/SES, OAuth providers (Google, etc.), Webhooks (robust retry/idempotency) Keywords (ATS-friendly) Ruby, Ruby on Rails 7, Hotwire, Turbo, Stimulus, ViewComponent, Sidekiq, Redis, PostgreSQL, RDS, GraphQL, REST, JSON:API, Docker, Docker Compose, Kamal, GitHub Actions, AWS, Render, NGINX, Traefik, Sentry, Prometheus, OpenTelemetry, Tailwind, TypeScript, React, Capybara, Playwright, RSpec, RuboCop, Brakeman, Stripe, Twilio, OAuth2/OIDC, Webhooks