Jonathan_Gustafsson

11+ year experienced CTO and full stack software engineer

Taught myself to build websites at 14. Always growing by continuously doing things I find fun.

I bring an entrepreneurial approach, leadership background, and product-focused mindset to every project, continually looking for ways to build great user experiences and work with high agency.

01

Chief Technical Officer

Feb 2022 - present
> anotherblock

Part of the founding team enabling individuals to invest in music rights from artists like Rihanna and Justin Bieber, onchain. Helped raise €7.3M and innovated on utilizing web3 for decentralization, transparency, and financial benefits for music royalties.

3,770 contributions during this period
M
W
F
2022
2023
2024
2025

Freelance

Jan 2022
> Virtune

Conducted a case study on enabling traditional investors to invest in crypto in Sweden, resulting in Virtune.com that lets users buy cryptocurrencies like staked ETH on Avanza.

Lead Frontend Developer

June 2021 - Dec 2021
> DAO

Created architecture and development guidelines, released a DeFi app, developed a prediction market app, and contributed to a combined market cap of $10,000,000.

Senior Frontend Developer

October 2019 - March 2021
> 3

Launched tre.se and its new webshop while architecting infrastructure to handle 400x traffic spikes during iPhone launches. Established development foundations that improved experience for developers, editors, and end-users while ensuring platform stability during peak demand periods.

2,887 contributions during this period
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W
F
2019
2020
2021

Senior Frontend Developer

February 2018 - October 2019
> Cabonline

Sweden's largest cab company where I built a suite of consumer and internal applications. Built a resilient static Next.js booking interface that continues to serve customers 6 years later - always bet on web.

2,505 contributions during this period
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W
F
2018
2019

Lead Frontend Developer

Nov 2016 - Feb 2018
> BidTheatre

Built core web app for programmatic ad platform with real-time dashboards. Enabled precision targeting across channels, connecting advertisers to audiences on desktop, mobile, and tablet.

Fullstack Developer

Jul 2014 - Nov 2016
> Digitalist
1,949 contributions during this period
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W
F
2014
2015
2016

Web Developer

Jan 2014 - Jun 2014
> Tinymondo

Web Developer

Sep 2013 - Jan 2014
> FernvikBalotis
02

Hackathons

Agentic Ethereum - 2025

Solo hacking on Eliza and AA

ETHGlobal Paris - 2023

Onboarding creators to Lens with erc-6651

ETH Istanbul - 2023

1st prize from Aave and Unlimit

ETH Lisbon - 2023

Wins from Lens

Arbitrum Hackathon Bogota - 2022

1st prize from Livepeer and Chainlink

ETH Bogota - 2022

Wins from 9 sponsors

ETH New York - 2022

Winner, Open Track and 1st prize from UMA

ETH Lisbon - 2021

Winner, Open Track

03

Product Recordings

Unedited snapshots of previous work

04

Skills

  • TypeScript
  • JavaScript
  • viem
  • wagmi
  • ethers.js
  • Solidity
  • React
  • Gatsby
  • Next.js
  • React Native
  • GraphQL
  • Node
  • Apollo
  • Cypress
  • Jest
  • MongoDB
  • evm
  • Foundry
  • Hardhat
  • Hasura
  • Docker
  • PostgreSQL
  • AWS
  • Redux
  • Mobx
  • CSS-in-JS
  • CI/CD
  • Serverless
  • SEO
  • PWA
  • Python
  • Eliza
  • Drizzle
  • AI
  • LLM
  • account abstraction
05

NPM Package Usage

Based on the project.json files found on my computer