Experienced software developer specializing in online marketplaces and eCommerce applications. My daily responsibilities include developing applications using Ruby on Rails and React.js, administering Linux servers, scaling applications, managing databases, improving performance and security, and configuring and maintaining mail servers. ### Languages & Frameworks * Ruby, Ruby on Rails, Sinatra * React.js, JavaScript, TypeScript, Next.js * Node.js, jQuery * Spree Commerce, Sharetribe Go * Bash Scripting ### Databases & Search Technologies * PostgreSQL, PostGIS, MySQL, Oracle * MongoDB, Cassandra, Neo4j, IndexedDB * Redis, Memcached, RabbitMQ * Apache Solr, Elasticsearch, Sphinx * Database normalization and performance optimization * Supabase ### API Development & Integrations * REST API development for web, Android, and iOS applications * Payment gateway integrations: Stripe, Authorize.Net, Braintree, Adyen, and others * Amazon Advertising & Marketplace APIs * Google APIs, Gmail API, Google Drive API, Adwords API * Facebook Ads API, Instagram API, YouTube API, Twitter API * USPS, FedEx, UPS APIs * Twilio API, Acuant API, Signifyd Fraud Detection API ### Frontend & UI Technologies * Bootstrap 3/4/5 * Tailwind CSS * ZURB Foundation, Materialize * Kendo UI, Shield UI, Ext JS * HTML5, CSS3 * Responsive web and mobile design * Cross-browser testing for desktop, iPhone, and Android devices ### Data Visualization * AmCharts * FusionCharts * Highcharts * Plotly * Chart.js ### Cloud, DevOps & Infrastructure * AWS (EC2, S3, RDS, SES) * Docker, Heroku, DigitalOcean, Linode * Linux, Ubuntu, RedHat, Fedora * SMTP, IMAP * Mail servers, FTP servers, Samba servers * VPN servers, Proxy servers, cPanel * SSL certificate installation and server security ### Additional Experience * Maintaining and upgrading legacy Ruby on Rails applications * Claude API / Cursor API / code review workflows * Microservices architecture * Web scraping and automation * JWT authentication * MQTT and Kafka streaming * Automation tasks such as: - Facebook/Instagram/Google Ads publishing - Report generation - Backup automation ### Migration & Modernization * PHP/Laravel to Ruby on Rails migration * Django/Flask to Ruby on Rails migration * Node.js to Ruby on Rails migration ### Application Domains * eCommerce and marketplace platforms * Logistics and distribution systems * Chat applications * Video streaming platforms * Real estate applications * SaaS applications

Experienced software professional specializing in frontend development, database management, web frameworks, cloud deployment, automated testing, and emerging technologies. Proficient with Ubuntu 24.04 and dedicated to ongoing innovation in the tech industry. Demonstrated commitment to staying ahead of technological advancements through work with Open AI and Claude API.

I build fast, scalable, and user-focused web and mobile applications for startups, small businesses, and enterprises. I’ve worked across Finance, Healthcare, Transportation, and SaaS, delivering solutions that improve performance, automate workflows, and help companies grow. Frontend Development - React.js, Next.js, Angular, Vue.js - HTML5, CSS3, SASS, Tailwind, Material-UI, Bootstrap - TypeScript, Redux, Global State, Component Architecture - Clean, modern, responsive UI/UX Backend Development - Node.js, Express.js, PHP (Laravel, Mason, CGI) - PostgreSQL, MySQL, Sequelize, Prisma - MongoDB, Firebase, Mongoose - REST APIs, GraphQL, Socket.io (real-time apps) ☁️ Cloud & DevOps - AWS & Azure (Certified Solutions Architect) - Docker, CI/CD pipelines - Cloud deployments, scaling, and migrations General Skills - JavaScript (ES6+), TypeScript - API integrations (Stripe, PayPal, OAuth, etc.) - Testing: Jest, Cypress - Clean code, maintainable architecture, best practices

DevOps Engineer with more than 10 years of experience in Ruby on Rails in a startup company. I have a bachelor degree in Computer Science. I have experience in configuring and managing kubernetes specifically Digital Ocean's k8s, and docker swarm.

Building state-of-the-art, user-friendly websites is my passion. I take pride in crafting high-performance, intuitive web applications that meet modern industry standards. I am confident that my skills and experience make me an excellent choice for your projects. I stay ahead of the curve by continuously learning new technologies and keeping up with the latest industry trends. This proactive approach allows me to deliver exceptional solutions that not only meet but exceed client expectations. Let’s build something great together!

Software Engineer with experience building and maintaining production-grade web applications using Ruby on Rails, Turbo/Stimulus, React, and Tailwind CSS. Worked on enterprise platforms across vessel operations, school management, and interview scheduling. Passionate about clean, scalable UI and solving real-world workflow problems.

I’m a seasoned Software Engineer specializing in Rails and Angular, with a robust track record of engineering innovative web solutions for businesses ranging from startups to large enterprises. My deep expertise in web development is complemented by years of experience where I've consistently delivered projects that meet and exceed client expectations. As a Development Manager, I excel in leading diverse teams through the complexities of software projects, ensuring we stay on track with timelines and budgets. My leadership is defined by clear communication, collaboration, and an unwavering commitment to fostering an environment ripe for innovation. This approach has consistently resulted in high-performing teams and stellar project outcomes. I pride myself on being at the forefront of web development, constantly integrating the latest technologies and trends to ensure every solution is scalable, secure, and maintainable. My meticulous attention to detail means that I deliver solutions that are not only robust and functional but also visually appealing. Beyond technical prowess, my interpersonal skills stand out. I build and maintain strong relationships with clients and team members alike, which helps in crafting tailored solutions that truly resonate with user needs. I am committed to continuous learning and staying ahead in a fast-evolving industry, reflecting my passion and dedication to the field. I am here to bring your vision to life with cutting-edge solutions that are meticulously crafted and executed. Let's collaborate to create something extraordinary!

Hi, I'm Heindrick Dumdum, I'm an experienced web developer and I'm looking for someone to whom I can help with my expertise for their needs. I’m responsible for developing and evolving the business’s sites/software/applications using the latest software development infrastructure and methods. I’m also responsible for the development of analytics of any arising solutions in the site/software. I also develop technical and complex MS SQL Server Databases and also designs security and data protection measures and implements data-storage solutions and web applications through web application frameworks. It is the duty of the Backend Developer to develop sites/software through configuration driven behaviors and dependency injection. Here are what I specialize in. - LTI integration - stock & option trading algorithm development - ODOO - Django, DRF, FastAPI - AWS, GCP, Azure DevOps Kind Regards, Heindrick

Currently specializing in full stack React, lead gen, scraping, real estate data. I have a 100% success rate over 800+ projects. - Puppeteer / Selenium / Playwright - Rescuing web projects from other developers / vibe coders - Full-stack React (next.js / tailwind) - Data projects (import / sync / headless api) I am not currently bidding on projects, I will only consider projects that I have been invited to. The reason for that is that all jobs lately are now flooded with unqualified applicants (Upwork please fix this).

Hello, my name is Jerryson Lacson and I'm from Philippines. Innovative and results-driven Technical Lead and Senior Software Engineer with over 15 years of experience designing and delivering scalable software solutions. Proven leadership in guiding cross-functional teams, driving architectural excellence, and ensuring high-quality code. Adept in full-stack development, cloud technologies, DevOps, and microservices architecture. Sincerely Jerryson L.