Founder/Developer
Sep 2026 — present
Founded an independent software development consultancy focused on dependable backend systems, integrations, data-intensive applications, and long-term technical partnerships.
RubyElixirPostgreSQLLinuxConsulting
resume / Sep 2026
Joakim Nylén
backend developer
Backend developer with 15+ years of experience across consulting, product development, and entrepreneurship. Strongest in Ruby, Elixir, data-heavy systems, integrations, and the practical work of keeping production software dependable over time.
Work experience
Backend Developer
Apr 2023 — present
Architecting and developing a comprehensive outdoor adventure platform for Nordic municipalities, leading migration from Rails to Elixir while managing Linux servers, deployments, and uptime for systems serving more than 10 million views and around 2 million API calls per day.
RubyElixirRustGoGIS
Senior Ruby on Rails Consultant
Sep 2025 — present
Senior Backend Consultant for enterprise clients across financial services and non-profit sectors, architecting scalable APIs and database schemas for high-traffic applications.
RubyElixirPostgreSQL
Senior Ruby on Rails Consultant
Nov 2023 — Oct 2024
Senior Backend Consultant delivering production-grade applications for enterprise clients, architecting scalable APIs and optimized database schemas for high-traffic systems.
RubyPostgreSQL
Founder & Developer
Pixelmonster
Aug 2020 — Oct 2024
Founded and scaled EPG data infrastructure serving major Swedish media companies, building high-throughput data pipelines processing 460 GB daily.
ElixirRubyData PipelineAPI DevelopmentB2B
Backend Developer
Jan 2020 — Mar 2023
Backend developer for gaming and nature platforms handling high-volume concurrent users, optimizing code to reduce client expenses and leading infrastructure migrations.
RubyElixirPostgreSQLDocker
Selected projects
mrml-rails
Handle MJML templates in Ruby on Rails with ease. A popular gem for building responsive email templates.
String Matcher
Match strings to valuable data in Elixir. Powerful string matching and parsing utilities.
xler
Parse Excel files in Elixir using Rust. High-performance XLSX parsing with native bindings.
Vind
The project that handled the import of TV data for XMLTV.se. Robust data pipeline architecture.
Metagraph
A metadata database in Elixir. Flexible schema for storing and querying metadata at scale.
PST
Paste and Share Tool - A Rust command-line application for uploading files and pastes to multiple sharing services with automatic prioritization and fallback.
Core skills
Expertise
Backend DevelopmentData IngestionServer ManagementCode Performance
Languages & Frameworks
ElixirPhoenix FrameworkRuby (on Rails)Tailwind CSSPerlPHPRustGo
Platforms
HerokuAmazon AWSNetlifyRenderOVHHetznerBarebone Linux
Highlights
- Founded XMLTV.se and built EPG data infrastructure processing 460 GB of incoming EPG files from TV channels daily, serving thousands of users and major Swedish media companies for 15 years
- Created mrml-rails gem, now used by thousands of developers for responsive email templates in Ruby on Rails
- Architected high-throughput data pipelines handling millions of records daily for media distribution
- Delivered production systems for multiple enterprise clients as Senior Ruby on Rails consultant
Education
Web Developer E-commerce
Changemaker Educations
2018 — 2020
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).
Selected clients and sectors
Game Publishers
Games and IPs
- Age of Wonders: Planetfall
- Cities: Skylines
- Crusader Kings 3
- Empire of Sin
- Europa Universalis IV
- Hearts of Iron 4
- Imperator Rome
- Prison Architect
- Second Extinction
- Stellaris
- Surviving Mars
- Surviving the Aftermath
- Victoria 3
- World of Darkness
- Wraith: Oblivion - Afterlife
Media and Journalism
- Allt om Juridik Play
- Blendow Lexnova
- Iseskog
Civil Society and NGOs
- Alliance4Europe
- European Hub For Civic Engagement
- Citizens for Europe
- Volontärbyrån
Finance
Government
Sports/Outdoors
Education