Jakub Roztocil, Software Engineer


web apps dev tools Python JavaScript

Hey 👋🏻 I am a software engineer with 20 years of experience. I specialize in web applications and developer tools. My passion is designing, building & shipping products.

What I do

  • I build & ship software projects — web apps, developer tools, CLI apps, libraries, extensions; as sole developer, team member, or lead.
  • I write open source software such as HTTPie, a command-line HTTP client and one of the most popular Python projects on GitHub, or rrule.js, a popular TypeScript library for recurrence rules.
  • I have a background in startups — I have been involved in tech startup teams as senior eng, lead dev, co-founder, and CTO; in San Francisco, London, Copenhagen, Barcelona, and Prague.

My experience

I have been working mostly in & on startups for over a decade now. Some have been VC-funded and some bootstrapped.

Subtle Apps (redirects here)

2005—, self-employed

Web app development consultancy. Consumer internet products with 300M+ page views.

Python Django JavaScript React

Termible

2020—, Founder

Let people try your product and follow tutorials from the terminal without leaving the browser.

Python JavaScript

Homewings

2016—2018, London, CTO & Co-Founder

Online interior design platform and marketplace. Backed by IKEA.

Python Django JavaScript React

Pex.com

2014—2015, San Francisco, Full-Stack Developer

The global video & music search engine.

Python Django JavaScript

Opbeat (acquired by Elastic)

2013—2014, Copenhagen, Senior Software Engineer

Application performance monitoring platform. Backed by FB and Instagram co-founders.

Python Django JavaScript

Edufy

2012—2013, Copenhagen, CTO & Co-Founder

Intelligent scheduling platform for students and universities.

Python JavaScript

1calendar

2010—2012, Copenhagen, CTO & Co-Founder

Web & mobile calendar and to-do app integrating school, personal and Facebook events.

Python JavaScript

See all experience on LinkedIn ›

What I studied

Continuous self-education guided by curiosity is the name of the game for me. I read books. Institutionally, the field of my study was Information Science:

  • Charles University in Prague, Czechia (bachelor’s degree)
  • University of Porto, Portugal (ERASMUS programme)
  • Royal School of Library and Information Science / University of Copenhagen, Denmark (Masters programme; incomplete)

What I open-sourced

Open source software development is in my DNA. I have been creating, maintaining, and contributing to various projects for 10+ years. Here are some of the things I have built:

HTTPie

Modern command-line HTTP client.

Python HTTP CLI

rrule.js

Recurrence rules for calendar dates as per the iCalendar RFC.

JavaScript TypeScript

Cointrol

Bitcoin trading bot with a real-time dashboard.

Python Tornado Django Postgres Redis JavaScript

CloudTunes

Web-based music player for the cloud.

Python Tornado Redis MongoDB JavaScript

httpcat

Utility for constructing raw HTTP requests on the command line.

Python HTTP CLI

geotagger

Geotag photos based on your smartphone location history data.

Python Flask

podcats

Generates RSS feeds for podcast episodes from local audio files and expose both via a built-in web server.

Python Flask

See all open source projects on GitHub ›

How you can hire me

You can hire me for consulting work. I especially like to do shorter projects.

Services
web apps MVPs interim CTO technical adviser Python Django JavaScript React Next.js …
Communication
English Spanish Czech remote GMT+2

How to get in touch

Feel free to connect with me about consulting and volunteering opportunities. I am always open to providing feedback and advice to open source projects and early-stage startups.


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