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NiceLeader/README.md

Maciej Lewandowski

Senior Blockchain Engineer — Solana · EVM · Bitcoin · Hyperledger DLT

7+ years building production systems across blockchain, fintech and enterprise backends.
Backend-heavy stack: TypeScript / NestJS, Java / Spring, Rust on Solana. Based in Poland 🇵🇱

🔭 Currently

🟢 Solana token infrastructure — Token-2022, Meteora CP-AMM, Jupiter Swap, Helius RPC, Squads Multisig V4, GCP KMS signing
🟢 Web3 payment rails — Wagmi / Viem / RainbowKit, stablecoin flows (USDC/USDT), x402 protocol, fiat on/off-ramp, ERC-4337 account abstraction
🟢 Enterprise DLT — Hyperledger Besu / GoQuorum (QBFT), Firefly middleware (TM, KM, CM), Kaleido platform, Terraform-managed multi-env infra
🟢 Fintech backend — Java / Spring Boot microservices, Solace messaging, Liquibase, Helm, Azure DevOps CI/CD for APAC enterprise client
🟢 AI tooling — multi-agent dev workflows, MCP servers, automation pipelines (TypeScript / Python)

🛠 Core Stack

Blockchain: Solana · Rust · Anchor · Solidity · Hyperledger Besu/GoQuorum · Firefly · Kaleido · EVM
Web3: Web3.js · Ethers · Wagmi · Viem · SIWE · ERC-4337 · WalletConnect · Hardhat · Foundry
Backend: TypeScript · NestJS · Node · Java · Spring Boot · Python · PHP / Laravel
Data: PostgreSQL · Kysely · RabbitMQ · Redis · IPFS · Liquibase
Infra: AWS · GCP · Kubernetes · Terraform · Docker · ArgoCD · Helm · Azure DevOps

solidity rust typescript nestjs nodejs nextjs react java spring python php laravel postgresql redis docker kubernetes terraform aws gcp linux

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