- Past: Html, Css, Javascript, Python, C, Electronics, PIC, Assembler
- 2016-04 - 2017-02: Ruby on Rails, CoffeeScript, Git, Github - https://github.com/madacol/learningRoR
- 2018-02 - current: Arduino / C++ - https://github.com/madacol/ArduinoOven
- 2018-06 - 2020-06: Ruby / Sinatra, Heroku - https://github.com/madacol/bolivarparalelo
- 2018-06 - current: Markdown, Plain text documenting - https://github.com/madacol/docs, https://github.com/madacol/aboutme, https://github.com/madacol/bolivarparalelo/commit/14dd227dce3a3002185f847b1b04a10a245736f5#diff-04c6e90faac2675aa89e2176d2eec7d8
- 2019-02 - 2019-10: Visual Basic / WPF, SQL / Mysql, Php / Laravel / Slim - <www.mifacturaperu.com>
- 2019-06 - 2020-04: React, Redux, NodeJs / ExpressJs, SQL / Mysql - <www.mifacturaperu.com>
- 2019-08 - 2020-11: Jest, Docker - <www.mifacturaperu.com>
- 2019-08 - 2019-09: Python / Flask, matplotlib - https://github.com/madacol/webOven
- 2020-01 - current: Svelte - https://github.com/madacol/bolivarparalelo/commit/24bb4e46377df21c09160ac85ec6905305b62d33
- 2020-05 - current: Google Analytics, HotJar, FullStory - https://github.com/madacol/bolivarparalelo/commit/1c4cbf2bb3ae2ad5f8e301d8b7f5965641adc08f
- 2020-05 - current: Svelte / Sapper, SSR / Server Side Rendering - https://github.com/madacol/bolivarparalelo/commit/8f2c4c2c6b30aac069979289c98ddfecfa31d994
- 2020-06 - current: Vercel, Serverless - https://github.com/madacol/bolivarparalelo/commit/8f2c4c2c6b30aac069979289c98ddfecfa31d994
- 2020-07 - current: Google Cloud Platform / PostgreSQL
- 2020-07 - current: Note-Taking-System, Zettelkasten
- 2016-12 - 2018-02: I developed pain in my arms and couldn't code, probably stress-induced