Hello, World.

I'm Tonio Serna.

Full Stack Ruby on Rails Developer Ruby Backend Developer Economist

More About Me

Let me introduce myself.

Profile Picture

Optimist, persistent, multicultural and always ready for changes.


I like to know people, travel, languages, understand the problems in the economy, to motivate others, laugh, dance, swim, music, photography (even I don't have a proper camera but someday soon). I'm some 25% Mexican, 35% Spanish and the rest it is mostly mixed and scrambled with Europeans, Northamericas, Latinamericans and random people whitout specially any clear flag or belong feeling. As studies I'm economist and nowadays I am a Full Stack Web Developer in Ruby on Rails. I did and try some different fields, Marketing, PR, Economics, Services sector, Consulting and right now Web Development that is now is one of my hobbies. My idea is create in few years a human valuable Startup with some amazing people.

  • Fullname: Antonio Serna Gutierrez
  • Job: Full Stack Ruby on Rails Developer specialized in Backend.
  • Website: tonextflow.com
  • Email: antonelo+i(at)gmail(dot)com


Other skills

RSpec, TDD, Database( PosgreSQL, MongoDB, Mysql, Sqlite ), jQuery, AJAX, Bootstrap, User Authentication and Authorization, Stripe, Caching, Gems*(Rubocop, Pry-byebug, byebug, pg, Nokogiri, Reek, Capybara, Cancancan, Devise, Aws, dotenv, git-secrets ... ), Google Docs, Office, Excel, Wordpress, FinalCut, Windows, GIMP, Ubuntu, Inkscape


More of my credentials.

I have been working in many fields as Consulting, Services Sector, PR, Audiovisuals, Marketing and nowadays as Ruby on Rails Developer. My current goal is to become a Senior Developer.

Work Experience


Founder, Full Stack Services

May 2018 - Present

ToNextflow T.S.G

Full Stack services:
- Backend: Ruby, Rails, git, PosgreSQL, Mysql, Autenthication, Sentri, Heroku, AWS, Docker, Caching
- Front-end: JavaScript, CSS, JQuery, Ajax, GIMP, responsivness


Founder & Full Stack Developer

September 2017 - Present

COPAIR Solutions

Pair Programming online matching platform, Copair Solutions is the smart path to improve your coding skills

Copair Solutions

Junior Ruby on Rails Backend Developer

March 2017 - September 2017

COUP Mobility

Working on API, Billing Service, ActionMailer, database administration and setting up translations. Ruby on Rails Development, Testing via RSpec, Agile Developement, Jira Workflow and regular Pair Programming sessions.

John Coaching

Web Development Volunteer Advisor

November 2016 – September 2017

John Coaching

Web Development mentor via pair-programming, help and advice the first steps of the Startup in technical aspects, workflow and webdesign usability.

FlavourSys Technology

Junior Ruby on Rails Developer

March 2015 – December 2015

FlavourSys Technology

Internal License Manager, full stack development.


Junior Ruby Developer

February 2014 – February 2015


Calendar Synchronization, offer calendars management, synchronize new partner offers


Marketing Area

April 2012 – October 2013


Hosts aquisition, PR, events, online and offline marketing


Junior Business Consultant

November 2009 – November 2010


Support, advanced office IT and economical research in various departments



Full Stack Web Development in Ruby on Rails

June 2016 - September 2016


Coding Bootcamp based on the next topics:
- HTML and CSS
- Bootstrap Front End Framework
- Javascript/ jQuery and AJAX
- Ruby
- Ruby on Rails
- User Authentication and Authorization
- RSpec
- Stripe Payment Processing
- Caching
- Git
- Heroku


Ruby, Web Development

March 2016 - June 2016

Launch School

Introdoductory Review about Web Developmnt, deep Ruby basis.

Universitat de Valencia

BA+MA Economics

March 2004 - June 2011

University of Valencia


Erasmus program

September 2008 - June 2009

Vienna University of Economics and Business Administration

Universitat de Barcelona

National Exchange Student, Economics

September 2007 - June 2008

University of Barcelona


Check Out Some of My Works.


What Can I Do For You?


I would like to know from you

Do you want to meet for a Coffee? Contact me!

Where to find me

Factory - Mitte
Rheinsberger Str. 76/77
10115 Berlin

Email Me:


Call Me:

(+49) 1573 622 28 57