Javier is available for hire

Javier Treviño Saldaña

Verified Expert in Engineering

Software Developer

Location

Monterrey, Mexico

Toptal Member Since

November 22, 2013

Javier Treviño Saldaña is a software professional who specializes in development, maintenance, and training. Over the past 10 years, he's served as CTO for multiple startups, helped build dozens of software systems, and coached senior software engineers and teams at renowned companies.

Full-stack Cloud Infrastructure Full-stack Development Front-end RESTful Web Services System Administration Integration Back-end Customer Relationship Management (CRM)CTO Web Scraping Data Scraping WebSockets Chatbots Airtable

Portfolio

Dynamic.Tech

Java, Go, Clojure, Ruby, Extreme Programming, Python, React, JavaScript...

Apptegy

Ruby, Ruby on Rails (RoR), Docker, Vue, Kubernetes, Team Leadership...

Independent

React, JavaScript, Go, Clojure, Ruby, Extreme Programming, Ruby on Rails (RoR)...

Experience

Ruby - 15 years JavaScript - 15 years Agile Software Development - 10 years Extreme Programming - 10 years React - 6 years Java - 5 years Clojure - 3 years Go - 1 year

Availability

Part-time

Preferred Environment

MacOS, Linux

The most amazing...

...Ruby framework I've built is Wordsmith, which has a built-in command-line toolset to create, share, publish, and collaborate on ebooks, guides, manuals, etc.

Work Experience

Founder

2018 - PRESENT

Dynamic.Tech

Wrote high-quality software, with experience ranging from funded startups to world-renowned companies.
Helped organizations create high-performance teams. The industry practices we followed and taught were drawn from leading, proven sources.

Technologies: Java, Go, Clojure, Ruby, Extreme Programming, Python, React, JavaScript, Ruby on Rails (RoR), Git, Agile Software Development, Functional Programming, Elasticsearch, Docker, Back-end, Kubernetes, OpenAI, OpenAI GPT-3 API, OpenAI GPT-4 API, Next.js, Node.js, HTML, Full-stack, CSS, MongoDB, Bootstrap, API Development, Technical Leadership, Software Architecture, Design Patterns, HTML5, Test-driven Development (TDD), APIs, Data Scraping, Web Scraping, React Native, Expo, TypeScript, Architecture, Artificial Intelligence (AI), MySQL, Selenium, Cloud Infrastructure, Full-stack Development, Bots, GraphQL, Rails Engines, AWS Lambda, Serverless, Trello, Front-end, Azure, Laravel, Databases, Gatsby, FastAPI, Vue, Chrome Extensions, PostgreSQL, Nuxt.js, Redis, Django, Inventory Management, REST, XLSX File Processing, Beautiful Soup, Chatbots, CSS3, RESTful Web Services, Google Cloud Platform (GCP), Heroku, Test Automation, Spring Boot, eCommerce, CTO, Shopify API, API Integration, Payment APIs, Leadership, Card Payments, Digital Payments, Fintech, Payment Gateways, QR Codes, Stripe Payments, Google Cloud, Airtable, JSON/XML Schemas, PDF, REST APIs, GitHub, WebRTC, Customer Relationship Management (CRM), Team Leadership, Software QA, Project Management, Large-scale Web Crawlers, Data Aggregation, CircleCI, Google Maps, Sentry, React Navigation, React Router, Redux, Zapier, System Administration, AWS Amplify, Spring, VoIP, WebSockets, iOS, Flask

VP of Engineering

2022 - 2024

Apptegy

Helped guide a team of over 100 software engineers, remotely and on-site in the USA and Mexico, to build high-quality software products.
Reduced the risk of changing critical legacy systems and improved the overall software delivery lifecycle.
Improved recruitment and onboarding practices to help new hires hit the ground running.

Technologies: Ruby, Ruby on Rails (RoR), Docker, Vue, Kubernetes, Team Leadership, Software QA, Project Management, Integration, VoIP

Senior Software Developer

2013 - 2018

Independent

Helped build high-performing teams, leading by example.
Created web apps and services, both solo and with teams.
Taught software engineering via formal training programs and workshops.
Made software systems reviews to identify risks and tech debt. Taught practices to recover from and prevent them.

Technologies: React, JavaScript, Go, Clojure, Ruby, Extreme Programming, Ruby on Rails (RoR), Git, Agile Software Development, Functional Programming, Python, Docker, Back-end, Next.js, Node.js, HTML, Full-stack, CSS, API Development, Technical Leadership, Software Architecture, Design Patterns, Amazon Web Services (AWS), HTML5, Test-driven Development (TDD), APIs, Architecture, Full-stack Development, Front-end, Databases, PostgreSQL, Redis, Inventory Management, REST, XLSX File Processing, Chatbots, CSS3, RESTful Web Services, Google Cloud Platform (GCP), Heroku, Test Automation, Shopify API, API Integration, Payment APIs, QR Codes, Airtable, JSON/XML Schemas, PDF, REST APIs, GitHub, WebRTC, Customer Relationship Management (CRM), Software QA, Project Management, Large-scale Web Crawlers, Data Aggregation, CircleCI, Google Maps, Sentry, React Navigation, React Router, Redux, Zapier, Integration, GraphQL, VoIP, WebSockets, Flask

Software Engineering Coach

2015 - 2016

Symantec

Trained a group of (senior) software engineers. Taught key ideas of TDD and practices that support it.
Showed engineers how to deal with features that are difficult to test.
Taught how to maintain discipline in systems with high technical debt.
Trained engineers on software design principles and patterns that support change.
Ensured that lessons taught were platform-agnostic.

Technologies: Python, Ruby, Swift, Java, C++, C, Extreme Programming, JavaScript, Git, Agile Software Development, Back-end, Node.js, HTML, Full-stack, CSS, API Development, Technical Leadership, Software Architecture, Design Patterns, Amazon Web Services (AWS), HTML5, Test-driven Development (TDD), TypeScript, Architecture, Selenium, Full-stack Development, Front-end, Databases, REST, RESTful Web Services, Test Automation, GitHub, Software QA

Senior Software Craftsman

2014 - 2016

8th Light

Provided test-driven development following the examples and practices of 8th Light's founders (and one of the industry's leaders, Robert C. Martin, a.k.a. Uncle Bob).
Worked with clients remotely and on-site, building software systems to help their businesses grow.
Provided software development services, from coding to project management.
Constantly learned through practice and mentoring others.

Technologies: Go, Clojure, Ruby, Java, Extreme Programming, React, JavaScript, Ruby on Rails (RoR), Git, Agile Software Development, Functional Programming, Elasticsearch, Docker, Back-end, Kubernetes, Node.js, HTML, Full-stack, CSS, MongoDB, Bootstrap, API Development, Technical Leadership, Software Architecture, Design Patterns, Amazon Web Services (AWS), HTML5, Test-driven Development (TDD), APIs, Data Scraping, Web Scraping, TypeScript, Architecture, jQuery, MySQL, Selenium, Cloud Infrastructure, Full-stack Development, AWS Lambda, Serverless, Trello, Front-end, Databases, PostgreSQL, Redis, Inventory Management, REST, Beautiful Soup, Shopify, CSS3, RESTful Web Services, Firebase, Google Cloud Platform (GCP), Heroku, Test Automation, Spring Boot, eCommerce, Shopify API, API Integration, Payment APIs, Leadership, Card Payments, Digital Payments, Fintech, Payment Gateways, QR Codes, Stripe Payments, Google Cloud, JSON/XML Schemas, PDF, REST APIs, GitHub, WebRTC, Customer Relationship Management (CRM), Team Leadership, Software QA, Project Management, CircleCI, Google Maps, Sentry, React Navigation, React Router, Redux, Zapier, System Administration, Integration, GraphQL, Spring, VoIP, WebSockets, iOS

Software Engineer

2015 - 2015

Ticketmaster

Helped create and maintain the back and front-end of web services used by millions.

Technologies: Java, Extreme Programming, JavaScript, Git, Agile Software Development, Back-end, React, Node.js, HTML, Full-stack, CSS, Bootstrap, API Development, Technical Leadership, Software Architecture, Design Patterns, Amazon Web Services (AWS), HTML5, Test-driven Development (TDD), APIs, Architecture, Selenium, Cloud Infrastructure, Full-stack Development, Front-end, Databases, REST, CSS3, RESTful Web Services, Test Automation, API Integration, Card Payments, Digital Payments, Payment Gateways, PDF, REST APIs, GitHub, Software QA, Integration, Spring

Partner, CTO

2014 - 2015

Develoft

Recruited, trained, and managed the engineering team.
Developed internal products and services.
Rescued projects in bad technical shape (losing money, no direction, no order).
Applied extreme programming principles and practices to improve our code and work rhythm.

Technologies: JavaScript, Ruby on Rails (RoR), Git, Ruby, Agile Software Development, Back-end, HTML, Full-stack, CSS, Bootstrap, API Development, Technical Leadership, Software Architecture, Design Patterns, Amazon Web Services (AWS), HTML5, Test-driven Development (TDD), APIs, Architecture, jQuery, MySQL, Selenium, Cloud Infrastructure, Full-stack Development, Rails Engines, Front-end, Databases, PostgreSQL, Redis, Inventory Management, REST, CSS3, RESTful Web Services, Heroku, Test Automation, eCommerce, CTO, Shopify API, API Integration, Payment APIs, Leadership, Card Payments, Digital Payments, Payment Gateways, QR Codes, Stripe Payments, JSON/XML Schemas, PDF, REST APIs, GitHub, Customer Relationship Management (CRM), Team Leadership, Project Management, CircleCI, Google Maps, Sentry, System Administration, Integration, WebSockets

CTO

2010 - 2013

NDA

Designed the training process for new hires.
Created the manual for design practices and principles.
Promoted a culture of personal development, open source contributions, and value for high quality code.
Increased profit about 4x by improving our software engineering practices.

Technologies: JavaScript, Ruby on Rails (RoR), Git, Ruby, Agile Software Development, Elasticsearch, Back-end, HTML, Full-stack, CSS, Bootstrap, API Development, Technical Leadership, Software Architecture, Design Patterns, Amazon Web Services (AWS), HTML5, Test-driven Development (TDD), APIs, Data Scraping, Web Scraping, Architecture, HIPAA Compliance, jQuery, PHP, MySQL, Selenium, Cloud Infrastructure, Full-stack Development, Bots, Rails Engines, Databases, PostgreSQL, Redis, Inventory Management, REST, XLSX File Processing, Beautiful Soup, Shopify, CSS3, RESTful Web Services, Heroku, Test Automation, eCommerce, CTO, Shopify API, API Integration, Payment APIs, Leadership, Card Payments, Digital Payments, Payment Gateways, QR Codes, Stripe Payments, JSON/XML Schemas, PDF, REST APIs, GitHub, Customer Relationship Management (CRM), Team Leadership, Project Management, Healthcare, CircleCI, Google Maps, Sentry, System Administration, Integration, VoIP, WebSockets

Experience

Wordsmith

Wordsmith is a Ruby framework with a built in command-line toolset to create, share, publish, and collaborate on ebooks, guides, manuals, etc.

TheTvDB ruby gem

https://github.com/jassa/the_tv_db

Ruby API Client to fetch TV shows information from TheTvDB.com

HMA (HideMyAss) Ruby gem

https://github.com/jassa/hidemyass

This Ruby gem aims to make an HTTP connection anonymously. It fetches proxies from hidemyass.com and tries each one until a successful connection is made.

Lazyload-Rails

https://github.com/jassa/lazyload-rails

This project integrates the jQuery Lazy Load Plugin with Rails image_tag helpers.

Javier Saldana on GitHub

https://github.com/jassa

I've contributed to some open source projects such as Spree (Ruby), Refinery (Ruby), and Heroku. Every once in a while I extract bits from my side projects.

Education

2008 - 2014

Bachelor Degree in Computer Science and Technology

Monterrey Institute of Technology and Higher Education - Monterrey, Mexico

2010 - 2011

Bachelor Degree in Science in Business Informatics

Monterrey Institute of Technology and Higher Education - Monterrey, Mexico

Skills

Libraries/APIs

React, Node.js, API Development, jQuery, Vue, Beautiful Soup, Shopify API, REST APIs, Google Maps, React Navigation, React Router, AWS Amplify, Rails Engines, WebRTC

Tools

Trello, GitHub, CircleCI, Sentry, Zapier, Vim Text Editor, Git, Emacs, Expo

Frameworks

Next.js, Bootstrap, React Native, Selenium, Redux, Spring, Flask, Ruby on Rails (RoR), Laravel, Nuxt.js, Django, Spring Boot

Languages

Python, JavaScript, Java, Ruby, HTML, CSS, HTML5, TypeScript, GraphQL, CSS3, Go, Clojure, PHP, Swift, C++, C

Paradigms

Extreme Programming, Agile Software Development, Design Patterns, Test-driven Development (TDD), REST, Test Automation, Functional Programming, HIPAA Compliance

Platforms

Shopify, Heroku, Docker, Amazon Web Services (AWS), AWS Lambda, Azure, Firebase, Google Cloud Platform (GCP), Linux, MacOS, Kubernetes, iOS

Storage

MySQL, Databases, PostgreSQL, Redis, Google Cloud, JSON/XML Schemas, Elasticsearch, MongoDB

Industry Expertise

Project Management, Healthcare

Other

Back-end, Full-stack, Technical Leadership, Software Architecture, APIs, Data Scraping, Web Scraping, Architecture, Cloud Infrastructure, Full-stack Development, Bots, Front-end, Inventory Management, XLSX File Processing, Chatbots, RESTful Web Services, eCommerce, CTO, API Integration, Payment APIs, Leadership, Payment Gateways, QR Codes, Stripe Payments, Airtable, PDF, Customer Relationship Management (CRM), Team Leadership, Software QA, Large-scale Web Crawlers, Data Aggregation, System Administration, Integration, WebSockets, OpenAI, OpenAI GPT-3 API, OpenAI GPT-4 API, Artificial Intelligence (AI), Serverless, Gatsby, FastAPI, Chrome Extensions, Card Payments, Digital Payments, Fintech, VoIP

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