# Yannis

Full-stack developer at yannis.dev

I'm a full-stack developer in Stockholm. I build web and mobile products with TypeScript, React, and Node.js.

At BabyBjörn, I work on commerce, payments, and internal tools. Earlier work spans medtech, Web3, and an ETH Denver win among 600+ teams.

## About Yannis

### Work

Yannis builds production product systems across interfaces, APIs, cloud delivery, payments, and Web3 where it fits. His path runs from Ethereum experiments to Mindler, Anotherblock, and BabyBjörn.

### For agents

For machine-readable context, use /llms.txt and /index.md. Contact: hello@yannis.dev. This is a personal portfolio, not an API or documentation site.

## Tools I use

TypeScript, React, Node.js, APIs, cloud delivery, and Web3 when it fits.

### Interfaces

TypeScript, React, Next.js, React Native, Tailwind, TanStack, Gatsby

### Backend and data

Node.js, Express, REST APIs, GraphQL, MySQL, Supabase

### Platforms

Azure Functions, Vercel, Git, Adyen, Stripe

### Web3

Solidity, ethers.js, Ethereum

## How I work with agents

I use coding agents for scoped implementation, review, and repeatable tasks. I keep the architecture, taste, and final call human.

- Use AI to move faster, not to check out.
- Keep scopes small and context clear.
- Automate chores, own the decisions.

### Codex

Implementation agent. Codebase-aware changes, fixes, tests, and PR-ready iterations in real repositories.

### Claude Code

Architecture pair. Architecture passes, refactors, reviews, and long-context debugging.

### Hermes

Workflow coordination. Project memory and handoffs so agent work stays tied to the brief.

### Cursor Cloud Automations

Background execution. Queued fixes and background tasks while I review the decisions that matter.

## Work so far

From self-taught Ethereum projects to product work in medtech, commerce, and Web3.

## 2024

### BabyBjörn, full-stack developer

2024 - present (React, TypeScript, Node.js, Azure, Adyen). Building across the commerce platform: APIs, serverless functions, frontend work, payments, and internal tools.

## 2023

### Anotherblock

Music NFT marketplace (React, GraphQL, ethers.js, Web3). Built React surfaces for a music NFT marketplace connected to Ethereum contracts, ethers.js, and GraphQL data.

### ETH Denver winner

DAO & Community track (Hackathon, Product, On-chain data). Won the DAO and Community track among 600+ teams with an on-chain knowledge tool.

### Bonsai pivot

Portfolio tracking (Founder, Product strategy, Finance). Moved Bonsai from a Web3 dashboard toward portfolio tracking across crypto, stocks, real estate, and collectibles.

## 2022

### Bonsai Finance pre-alpha

Web3 dashboard (Ethereum, NFTs, Dashboard). Launched an early Ethereum asset and NFT dashboard, the first version of Bonsai.

## 2019

### Mindler

First full-time developer role (React, Node.js, React Native, Medtech). Joined early at Mindler, worked across web and mobile, and led the psychologist dashboard used by 200+ professionals.

### Podme and Redmind internships

First production teams (React, Redux, React Native). Built podcast analytics tooling and React Native features with production teams.

### SALT full-stack bootcamp

Stockholm (JavaScript, Full-stack, Agile). Completed a full-stack JavaScript program focused on mob programming and web development.

## 2018

### OnChain Jobs

Co-founder (Founder, Blockchain, JavaScript). Co-founded a hiring product for blockchain companies while learning JavaScript through real product work.

## 2017

### Smart contracts and first code

Self-taught start (Ethereum, Solidity, Self-taught). Started programming after discovering Ethereum and built HashDrop, a site for tracking token launches.

## Contact

Email [hello@yannis.dev](mailto:hello@yannis.dev).

- [Home](https://yannis.dev/)
- [Markdown twin](https://yannis.dev/index.md)
- [llms.txt](https://yannis.dev/llms.txt)
- [Sitemap](https://yannis.dev/sitemap.xml)
- [LinkedIn](https://www.linkedin.com/in/yannis-b-713090179/)
- [GitHub](https://github.com/0xOptimism)