Edgar is available for hire
Hire EdgarEdgar Oswaldo Silva Cobian
Verified Expert in Engineering
Full-stack Developer
Location
Colima, Mexico
Toptal Member Since
July 4, 2012
Edgar is proficient in every aspect of web application development, from front- and back-end programming to client interaction, analysis, and database design. With a varied background, he's worked in many different roles throughout his career, including leadership and management positions.
Portfolio
Stanley.ai
React, Next.js, React Native, PostgreSQL, Node.js, Express.js, tRPC...
The Hybrid Group
Ruby on Rails (RoR), Ruby, Node.js, JavaScript, API Integration, Back-end...
Nuvocargo
Ruby on Rails (RoR), React, Database Design, REST, APIs, REST APIs...
Experience
Availability
Part-time
Preferred Environment
PostgreSQL, Git, Linux, GitHub
The most amazing...
...thing I've done is to contribute to open source projects like Cylon, Artoo, and Gobot (robotic frameworks) and SerialPort, Sphero, and Spark (Node.js modules).
Work Experience
Senior Software Development Engineer
2016 - PRESENT
Stanley.ai
- Acted as lead developer on designing and implementing a web app and rendering service API.
- Performed data modeling and DB design, implementation of rendering engine, and API design.
- Oversaw the design and architecture of the app and implementation and deployment to AWS services, as well as rendering service that can manage render design jobs in 100,000 seconds per hour.
- Developed a Ruby on Rails app that is still going strong with 5000-7500 seconds RPM on peak hours.
Technologies: React, Next.js, React Native, PostgreSQL, Node.js, Express.js, tRPC, Tailwind CSS, APIs, REST APIs, API Integration, Back-end, NestJS, Expo, Back-end Development, Full-stack, Full-stack Development, MUI (Material UI), Chakra UI, ES5, Amazon Web Services (AWS), Vercel, Front-end
Software Developer
2013 - PRESENT
The Hybrid Group
- Developed several robotics frameworks using different technologies, including JavaScript.
- Handled Ruby on Rails web development for different clients and JavaScript CLI tools.
- Developed several robotics frameworks using different technologies, including Ruby.
Technologies: Ruby on Rails (RoR), Ruby, Node.js, JavaScript, API Integration, Back-end, Back-end Development, Full-stack, Full-stack Development, ES5, Front-end
Senior Full-stack Software Development Engineer
2022 - 2022
Nuvocargo
- Improved performance of multiple DB queries and full-text search (FTS) API endpoints.
- Implemented complex client/server interactions between React clients and the corresponding Ruby on Rails API endpoints.
- Performed data modeling and database design improvements and improved Rails practices based on convention over configuration (as suggested by the Rails guides).
Technologies: Ruby on Rails (RoR), React, Database Design, REST, APIs, REST APIs, API Integration, Back-end, Back-end Development, Full-stack, Full-stack Development, ES5, Vercel, Front-end
Senior Full-stack Software Development Engineer
2020 - 2021
Wix
- Worked while our company transitioned from private to acquired by Wix.
- Implemented small modules for TypeScript and ways to connect different microservices.
- Had an understanding of microservices infra and how to interact with multiple mini apps.
Technologies: TypeScript, React, Ruby on Rails (RoR), Node.js, APIs, REST APIs, API Integration, Back-end, Back-end Development, Full-stack, Full-stack Development, ES5, Front-end
Senior Full-stack Software Development Engineer
2019 - 2021
SpeedETab.com
- Developed current online web store for clients and online marketplace using React.
- Developed web management dashboard for clients and admins using React and Ruby on Rails API.
- Implemented payment systems using Square, Stripe, and other points of sale (POS) using React and our Ruby on Rails API.
- Implemented phone authentication using Twillio, React, and Ruby on Rails.
Technologies: React, Node.js, PostgreSQL, APIs, REST APIs, API Integration, Back-end, Back-end Development, Full-stack, Full-stack Development, ES5, Front-end
Full-stack Ruby on Rails Developer
2015 - 2015
Designfeed.io (via Toptal)
- Created an image-handling site for marketing applications using Ruby on Rails.
- Created a design rendering service using Express.js and Chrome Headless.
- Designed and implemented a nonblocking queuing system for rendering designs and webhook notifications.
Technologies: PostgreSQL, JavaScript, React, Ruby on Rails (RoR), Ruby, APIs, REST APIs, API Integration, Back-end, Back-end Development, Full-stack, Full-stack Development, MUI (Material UI), Chakra UI, ES5, Amazon Web Services (AWS), Front-end
Web Developer
2009 - 2011
Acronym Media, Inc.
- Was the main developer for Search Engine APIs (Google Adwords API and Web Services, Yahoo Marketing Solutions and Web Services, and Microsoft AdCenter Web Services for Bing/Yahoo).
- Worked as a business analyst to analyze requirements, design, and implementations of solutions while working directly with clients in the US.
Technologies: MySQL, SQL, jQuery, JavaScript, Back-end, Back-end Development, Full-stack, Full-stack Development, Front-end
Project Leader
2005 - 2009
Softtek
- Analyzed, designed, and implemented web-based solutions and projects, working both as a project leader and developer through the entire cycle.
- Led requirements gathering (direct interaction with clients), requirements analysis, and database, graphical, and application design.
- Worked with technologies and solutions like HTML, XML, XSL, JavaScript, AJAX, Java, ASP, PHP, using frameworks like Spring Hibernate.
- Gained database experience in SQL Server, PostgreSQL, Oracle, and MySQL and established excellent Database Design and SQL skills. Used database design tools such as Embarcadero ER/Studio, MySQL Workbench and MS Visio.
- During this time communication and team leader skills were a must and excellent experiences came from interaction with team members and clients.
Technologies: MySQL, PostgreSQL, JavaScript, Back-end, Back-end Development, Full-stack, Full-stack Development, Front-end
Web Developer
2004 - 2004
Oklahoma University
- Built the CSD teachers site. Was a member of the web application team working in app development, DB Analysis and DB Design.
- Was a member of the system error detection team and usability surveys app team.
Technologies: CSS
Web Developer
2002 - 2004
CEUPROMED (University of Colima)
- Worked in the development of Interactive Media Discs (Natural and Cultural Diversity of Mexico) as a programmer.
- Involved in code development of interactive tools for the manipulation of media content.
- Developed a web applications using PHP, ASP.NET, Flash, HTML, CSS, and MySQL.
- Was a web developer, Asymetrix Toolbook developer, DB Designer, App Designer, and reusable code designer/developer.
Technologies: MySQL, CSS
Experience
CSD Teachers Site
I worked on developing the CSD teachers' site for the University of Oklahoma as an intern in 2004 while studying for my bachelor's degree in computer science.
The Teachers Union commissioned this work as part of a class project.
The Teachers Union commissioned this work as part of a class project.
WEGOHealth Sharing Hub
Site to promote health awareness using videos and social networks. I was in charge of design, development, and implementation. I upgraded from the previous site, redesigned, generated reusable code, and added major dynamic features to make management of content easier.
Artoo
A robotics framework written in Ruby.
https://github.com/hybridgroup/artooe
https://github.com/hybridgroup/artooe
Nuvocargo
https://www.nuvocargo.com/Logistics and freight between Mexico and the USA.
The new way to move cargo between Mexico and the United States.
Door-to-door shipments between Mexico, USA, and Canada are fast and simple. Reliable carriers, competitive prices, and dedicated bilingual experts give you back time and energy.
The new way to move cargo between Mexico and the United States.
Door-to-door shipments between Mexico, USA, and Canada are fast and simple. Reliable carriers, competitive prices, and dedicated bilingual experts give you back time and energy.
Stanley.ai
https://stanley.ai/Stanley.ai is a modern SaaS platform for the personalization of audience-level, intelligent creativity, and scale.
Our self-serve SaaS platform enables marketers to deliver the scale and personalized creative variants required by audience-specific content activities.
Stanley.ai is built for strategic marketing organizations and modern creative agencies that want to achieve both efficiency and productivity gains, increase speed to market, and improve business outcomes through audience-level creative personalization and scale.
Our self-serve SaaS platform enables marketers to deliver the scale and personalized creative variants required by audience-specific content activities.
Stanley.ai is built for strategic marketing organizations and modern creative agencies that want to achieve both efficiency and productivity gains, increase speed to market, and improve business outcomes through audience-level creative personalization and scale.
SpeedETab
https://www.speedetab.com/Mobile ordering made easy.
Branded app solutions that drive revenue and enhance the guest experience.
SpeedETab designs ordering experiences around the devices your customers are viewing them on. That means native mobile apps that your customers can easily navigate to order and pay for their favorite items. The result? Higher average ticket sizes, increased engagement, and an industry-leading user experience
Branded app solutions that drive revenue and enhance the guest experience.
SpeedETab designs ordering experiences around the devices your customers are viewing them on. That means native mobile apps that your customers can easily navigate to order and pay for their favorite items. The result? Higher average ticket sizes, increased engagement, and an industry-leading user experience
Skills
Languages
CSS, SQL, Ruby, JavaScript, TypeScript, ES5
Frameworks
Express.js, Ruby on Rails (RoR), Next.js, React Native, Tailwind CSS, MUI (Material UI), NestJS
Libraries/APIs
React, Node.js, jQuery, REST APIs
Tools
Git, GitHub, Expo
Paradigms
REST, Database Design
Platforms
Linux, Amazon Web Services (AWS)
Other
Back-end, Front-end, Leadership, Full-stack, Full-stack Development, APIs, API Integration, Back-end Development, Chakra UI, Vercel, tRPC, API Design
Storage
MySQL, PostgreSQL
Education
2001 - 2005
Bachelors Degree Degree in Computer Science
Universidad de Colima - Colima, Mexico
2004 - 2004
Exchange Program Degree in Computer Science
Oklahoma University - Oklahoma, USA