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Andrzej Budzanowski / Psychob

From PHP full-stack to backend and blockchain specialist — eight years shipping production systems that have to work. I build scalable APIs, smart contracts, and DeFi platforms using TypeScript, Node.js, and Solidity. Infrastructure runs under the hood with Docker, Kubernetes, and CI/CD pipelines. Currently open to backend contracts and blockchain consulting.

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0+ years experience
2137 blockchain projects
∞ shipped code
Expertise

What

Started in PHP, building full-stack web applications from the ground up. Over time I moved deeper into the backend — Node.js, TypeScript, distributed systems — and from there into blockchain, writing production smart contracts for Ethereum and EVM-compatible chains. Eight years in, always on the server side of things.

01

Backend Development

Node.js and TypeScript are where I spend most of my time. NestJS microservices, scalable REST APIs and the kind of server-side architecture that handles real load — built for production from day one.

02

Blockchain & Smart Contracts

Solidity designed from scratch, tested with Hardhat and hardened with OpenZeppelin. DeFi protocols, NFT platforms and token ecosystems deployed on Ethereum and EVM-compatible chains.

03

Infrastructure & DevOps

Docker, AWS, Nginx, GitLab CI/CD and Linux. Containerised deployments, automated pipelines and the infrastructure layer that keeps systems predictable in production.

04

Data & Architecture

PostgreSQL and Redis as the backbone. Distributed systems design, API contracts and the architectural decisions that let a service scale without breaking under pressure.

Tools of the trade.

The stack I reach for when building things that have to work in production — chosen for reliability, not trend.

Backend

  • Node.js
  • NestJS
  • TypeScript
  • PHP / Laravel

Blockchain

  • Solidity
  • Hardhat
  • OpenZeppelin
  • Web3 / IPFS

Data & Infra

  • PostgreSQL
  • Redis
  • Docker
  • AWS / Nginx / CI&CD

Languages

  • TypeScript
  • JavaScript
  • Solidity
  • PHP  ·  C#

Testing & Ops

  • Jest
  • GitLab CI/CD
  • Linux
  • Apache / Nginx

Web / 3D

  • Three.js
  • WebGL / GLSL
  • React / Next.js
Work

Selected

LIVE
01 · Three.js · WebGL · GLSL · 2026

RGB Lighthouse

Interactive 3D lighthouse with volumetric beam, pixel art post-processing, PSX vertex snap and dynamic RGB lighting. Built entirely with Three.js and custom GLSL shaders.

Open scene →
DeFi
02 · Solidity · Node.js · NFT · 2022

Paribus

Decentralized lending platform on Ethereum. Backend for NFT metadata retrieval, staking contracts and DeFi liquidity protocols. Built at 4soft.

paribus.io ↗
ICO
03 · Node.js · Blockchain · KYC · 2019

IvyKoin

ICO platform with integrated KYC/KYT compliance pipeline. Token sale infrastructure, wallet management and regulatory reporting.

4soft · 2019
Web3
04 · Solidity · TypeScript · IPFS · 2021

OkTY

Data monetization platform built on blockchain. Users own and sell their personal data via decentralized consent and payment contracts.

4soft · 2021
OSS
05 · PHP · Composer · Ethereum · 2023

ethereum-address-validator

Open-source PHP library for validating Ethereum addresses and checksums. 20 stars, 24 forks — used in production blockchain tooling.

GitHub ↗
WIP
06 · C# · Desktop · Productivity · 2024

time-tracker

Personal time tracking software built in C#. Focused on developer workflow — task tagging, reporting and activity analytics.

GitHub ↗
Experience
// EXPERIENCE

Where I've

8+ years · 4 companies · 7+ projects

2023 Present
Neti Current
Backend Developer

Details coming soon.

Node.js TypeScript

Mobile app startup. Solo designer and backend developer building the product from the ground up.

Node.js TypeScript
2017 2024
4soft
Senior Backend Developer & Blockchain Engineer · Kraków, PL

Software house specializing in fintech and blockchain. Led backend development across multiple DeFi, Web3 and ICO projects.

  • Architected IvyKoin ICO platform — token sale infrastructure, KYC/KYT compliance pipeline and wallet management
  • Built Paribus DeFi lending protocol backend — NFT metadata retrieval, staking contracts and liquidity protocols on Ethereum
  • Designed OkTY data monetization platform — decentralized consent contracts and payment flows on blockchain
  • Published ethereum-address-validator (PHP, OSS) — 20 GitHub stars, 24 forks, used in production blockchain tooling
Node.js Solidity TypeScript PHP Docker PostgreSQL Hardhat

Responsible for estimating and developing smart contract projects for various blockchain platforms, overseeing backend implementations using JavaScript and TypeScript. Also contributed to a proof-of-concept mobile application using Xamarin.

Projects

Paribus

Decentralized lending and borrowing platform — staking, NFTs as collateral, liquidations, rewards and a governance portal. Three-year collaboration.

  • Developed backend solutions to retrieve NFT metadata and transaction data for accurate valuation
  • Integrated the platform with multiple third-party services to enhance functionality
  • Designed and deployed native token and staking smart contracts
  • Managed subgraph definitions to optimize data indexing and retrieval on the blockchain
  • Provided technical advisory to support informed business decision-making
  • Collaborated with frontend developers for seamless backend-frontend integration
Champ Association

Platform connecting decentralized digital assets with physical products — custom "Blockchain-branded" champagne bottles. Liquidity provision, product purchases and metaverse-based games.

  • Developed a smart contract for the marketplace with customizable payment solutions
  • Created a smart contract for the platform's native token
  • Built a backend application to calculate the reflection mechanism for token holder payments
  • Designed and implemented the marketplace backend — product listings, transactions and user interactions
  • Collaborated closely with the client to define requirements and design platform architecture
IvyKoin

ICO platform for the IVY cryptocurrency — enhancing cryptocurrency usability with KYT and KYC information during transactions.

  • Developed and deployed the native IVY token ensuring compliance with industry standards
  • Designed and implemented a custom blockchain-based payment processing solution
  • Integrated CoinPayments API to enable seamless cryptocurrency transactions
  • Managed transaction data retrieval and integration from third-party services
  • Built a scalable backend application using PHP supporting core platform functionalities
OkTY

Data monetization platform — users share personal data while maintaining control, gaining access to exclusive promotions or earning revenue share.

  • Developed smart contracts implementing the platform's native token
  • Created functionality for converting external tokens to the native token within the platform
  • Implemented features for retrieving and processing payment transactions from users
Wiko

Proof of concept cross-platform mobile application using Xamarin for iOS and Android devices.

  • Engineered cross-platform mobile app with Xamarin for iOS and Android
  • Implemented advanced planning functionalities and comprehensive PDF annotation features
  • Enabled users to mark up, highlight and organize documents efficiently
Node.js Solidity TypeScript PHP Docker PostgreSQL Hardhat Xamarin Ethereum ERC-20 ERC-721
Feb 2017 Aug 2017
SoftWizard
Full-Stack Developer · Wrocław, PL

Built an e-commerce aggregator startup called Vendoria — a greenfield project from scratch.

  • Greenfield project — first time building from scratch
  • Direct impact on UI development and core functionalities
  • Collaborated with senior developers on RESTful APIs and third-party integrations
PHP Symfony Vue.js MySQL Docker

Focus on developing an aggregator of multiple e-commerce stores — startup called Vendoria. Greenfield project with direct impact on the development and implementation of user interfaces and underlying functionalities.

  • First time working on a greenfield project — built from scratch
  • Direct impact on development and implementation of user interfaces and core functionalities
  • Collaborated with senior developers to implement RESTful APIs and integrate third-party services
  • Worked with Git for version control and team collaboration
  • Implemented unit and integration tests to ensure application reliability and stability
  • Participated in Mobile-IT Expo 2017 in Kraków — explained product to visitors at the stand
PHP Symfony Vue.js MySQL Docker Git REST
Aug 2016 Jan 2017
Malvion
Full-Stack Developer · Opole, PL

Built CMS solutions for clients including Bank Jarocin and MebelArt.

  • Created CMS for Bank Jarocin
  • Built CMS for listing offers for MebelArt
  • Full-stack development across multiple client projects
PHP jQuery MySQL WordPress HTML/CSS

Responsible for creating CMS solutions for clients — including Bank Jarocin and a listing platform for MebelArt.

  • Created a CMS for Bank Jarocin
  • Built a CMS for listing offers for MebelArt
  • Full-stack development across the entire technology stack
  • Delivered client-facing projects on time with custom requirements
PHP jQuery MySQL WordPress HTML/CSS
Blog

From the

Gaming · Windows 2025

Counter-Strike 2 – SDL i lagi

Debugging input latency in CS2 caused by SDL on Windows — tracing the issue down to system-level event handling.

Read post ↗
Linux · GPU 2019

Konfiguracja karty graficznej na Ubuntu

Step-by-step guide for setting up an NVIDIA/AMD GPU on Ubuntu — drivers, Xorg config and multi-monitor setup.

Read post ↗
Tools · Video 2019

Przycinanie plików przy pomocy ffmpeg

Practical ffmpeg commands for trimming video files without re-encoding — preserving quality and keeping file size minimal.

Read post ↗
Contact

Let's talk.

Available for new projects

Open to backend contracts, blockchain consulting
and Web3 collaborations.

Email cv@andrzej.budzanowski.pl ↗ LinkedIn /in/andrzej-budzanowski ↗ GitHub /psychob ↗ Blog blog.psychob.pl ↗ CV andrzej.budzanowski.pl ↗