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Joakim Nylén

Backend Developer • Stockholm, Sweden

Contact

resume@joakim.nylen.nu
joakim.nylen.nu
github.com/jnylen
linkedin.com/in/joakim-nylen

Summary

Experienced Backend Developer with 15+ years of professional experience. Specialized in building scalable systems using Ruby and Elixir. Founded XMLTV.se, serving major Swedish media companies.

Expertise

▸Backend Development
▸Data Ingestion
▸Server Management
▸Code Performance

Languages & Frameworks

▸Elixir
▸Phoenix Framework
▸Ruby (on Rails)
▸Tailwind CSS
▸Perl
▸PHP
▸Rust
▸Go

Work Experience

Backend Developer

Apr 2023 – Present

OutdoorMap

Building scalable backend systems for outdoor navigation and mapping services using Ruby and Elixir.

RubyElixirRustGoGIS

Senior Ruby on Rails Consultant

Sep 2025 – Present

Nexer Group

Backed multiple high-profile clients in Sweden, delivering robust web applications and APIs using Ruby on Rails.

RubyPostgreSQL

Founder & Developer

Aug 2020 – Oct 2024

Pixelmonster

Built and operated EPG data collection, production, and distribution infrastructure serving major Swedish media companies and cable operators.

Data PipelineAPI DevelopmentB2B

Senior Ruby on Rails Consultant

Nov 2023 – Oct 2024

Nexer Group

Backed multiple high-profile clients in Sweden, delivering robust web applications and APIs using Ruby on Rails.

RubyPostgreSQL

Backend Developer

Jan 2020 – Mar 2023

Odd Camp

Previously Kollegorna. Backend development for gaming and volunteering platforms using Ruby and Elixir.

RubyElixirPostgreSQL

Education

Web Developer E-commerce

2018 – 2020

Changemaker Educations

Comprehensive program covering web development, e-commerce solutions, digital marketing, UX/UI design, and both frontend and backend programming. Included industry knowledge, project methodology, and practical work experience (LIA).

Open Source Projects

mrml-rails

Handle MJML templates in Ruby on Rails with ease. A popular gem for building responsive email templates.

RubyRailsEmail

String Matcher

Match strings to valuable data in Elixir. Powerful string matching and parsing utilities.

ElixirParsingData

xler

Parse Excel files in Elixir using Rust. High-performance XLSX parsing with native bindings.

ElixirRustExcel

Vind

The project that handled the import of TV data for XMLTV.se. Robust data pipeline architecture.

ElixirETLData Pipeline

Metagraph

A metadata database in Elixir. Flexible schema for storing and querying metadata at scale.

ElixirDatabaseMetadata

Key Achievements

• Founded and operated XMLTV.se for 15 years, building EPG data infrastructure serving major Swedish media companies

• Active open-source contributor with popular libraries like mrml-rails used by thousands of developers

• Built scalable backend systems handling high-volume data pipelines and ETL processes

• Worked with multiple high-profile Swedish companies as Senior Ruby on Rails consultant