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ANTONYSASTRE

Your friend in the digital jungle.

About

Antony Sastre

I'm a software engineer in Gothenburg, Sweden, with 25 years of building and running production systems — Ruby and Rails mostly, plus TypeScript, Go and whatever else the problem calls for. I work with small and mid-sized businesses as an independent consultant: bespoke systems, integrations, and lately a lot of putting LLMs to work in real workflows — where they actually help, not where the hype says they should. I also drink a lot of coffee.

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Projects I've worked on

Open source

sheets

A small utility for managing CLI cheat sheets — quick lookup, edit and search of the one-liners and snippets you'd otherwise scatter across notes, gists and shell history.

Source code →
salario

A Ruby gem for Swedish salary system calculations — gross/net pay, tax tables, employer contributions and the small arithmetic details you don't want to reimplement in every payroll-adjacent app.

Source code →
carl16

A summer project: building a complete 16-bit computer from logic gates up to an assembler and a small game running on the emulated machine. Equal parts Nand2Tetris exercise and excuse to write more Rust.

Source code →
shrty

A self-hosted, secure URL shortener with SSRF protection, API authentication and a Docker image. Built to be the boring, dependable redirect service you can run on your own infrastructure.

Source code →

Scribbles

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Latest interesting things (to me) that I've found online, ideas, thoughts, and reminders primarily regarding software development. Sometimes just some thoughts about life.

  1. Building an agentic AI in Ruby
  2. A year of the bot: what stuck, what didn't
  3. The new ratio of reading to writing code
  4. Juniors in the age of the bot
  5. Scope creep is a feature of how reality works

Career

-PresentNorth Collective

North Collective is an umbrella name for a group of senior software engineers working as freelance consultants. Our work is focused around delivering high-end feature development, integrations and system optimization. We specialize in solving complex problems for businesses by crafting tailored, scalable and efficient solutions that are robust and sustainable.

-Qasa

Qasa is a rapidly growing home rental marketplace, soon becoming Sweden’s largest and expanding globally. As part of the Backend team I helped develop and drive key projects in their growth journey, including integrating an insurance provider, building a scheduling system for viewings, implementing ID and credit checks for contracts, supporting releases in Finland and Norway, and assisting the Data Science team.

-Devies

At Devies I joined the CTO as a Service management consultant, offering strategic technical leadership. Primarily assigned to a client developing a tooth cavity scanner for home use, leading the product management workflow, structuring releases and regulatory work; primarily quality and risk management.

-Battleriff

An e-sports betting and community platform, primarily for MOBA games (LoL, Smite, Dota 2). I developed the MVP, aided in the seed funding, oversaw product and team development, and facilitated the company’s exit merger as an integration manager.

-Humly

A platform that simplified the temp hiring of substitute teachers, I recruited and led the development team for the heaviest growth period of the startup, from 7Mkr to 30Mkr. We rebuilt the MVP tech-stack to handle the expansion. I also supported recruiting developers and their internal CTO.

-Varvet

Former Elabs. A software agency, I worked as a developer primarily in Ruby on Rails and JavaScript. Involved in several projects for clients such as Moz.com, MyNewsDesk, TV4 and others.

-Volvo IT
-GE Capital