Looking for a job

Grzegorz Pięta

@selen

Blockchain engineer behind Barion, a DEX arbitrage system with successful Polygon transactions and ran on Polygon PoS, Base and Avalanche.

Poland

Message

What I'm looking for

I'm looking for blockhain/web3 role.

I built Barion, an atomic DEX-arbitrage system, first on Polygon PoS and then on Base, running it on my own nodes. On Polygon, 38 arbitrage transactions succeeded on-chain, with receipts verified on third-party nodes.

For Base, I adapted the bot to react to flashblocks and found and fixed a bug in Base’s client that caused fresh flashblock batches to be deleted. Base merged the fix, which shipped in release v1.4.0. I measured the live system and stopped live sending after tracing unsuccessful submissions to timing and network distance.

I started from zero in October 2024, with no prior IT background, and work measurement-first: I use AI to design and operate systems, then verify outcomes with controls and reproducible measurements. I also built Quantum Lab, an environment for AI coding agents working on production systems, and hold a Blue Team Specialist certificate from Jagiellonian University.

Experience

Work history, roles, and key accomplishments

Current

AI Environment Developer

Current

Quantum Lab

Jan 2026 - Present (9 months)

Developed Quantum Lab, an environment for AI coding agents on production systems, with structured sessions and adversarial review. Built harness guards and a stakes card system to prevent errors.

AI Claude Code System Design Testing Review Processes

Current

Blockchain Engineer

Current

Independent

Oct 2024 - Present (2 years)

Designed and operated Barion, an atomic DEX-arbitrage system on Polygon PoS and Base, including own node infrastructure and client patches. Achieved 38 successful arbitrage transactions on Polygon and fixed a bug in Base's client that was officially merged.

Blockchain Ethereum Polygon BASE MEV Arbitrage Solidity TypeScript NodeJS Erigon Reth Go Rust Linux Prometheus

Node Operator

Base

Aug 2026 - Sep 2026 (1 month)

Operated a base-reth-node, found and fixed a real bug in Base's client that was officially merged. Profiled flashblock processing, localized a memory leak, and made silent failures self-healing.

Rust Reth BASE Network Operations Systemd Cgroups Jemalloc Prometheus

Arbitrage Bot Developer

Base

Aug 2026 - Sep 2026 (1 month)

Moved Barion arbitrage bot to Base, measuring seven constraints and reworking the bot to react per flashblock. Achieved 88.7% frame reach and zero phantom transactions, and traced live results to their cause.

BASE Flashblocks Arbitrage TypeScript NodeJS Solidity Gas Modeling MEV

Node Operator

Polygon

Feb 2026 - Aug 2026 (6 months)

Operated an Erigon node for Polygon PoS, achieving 99.79% block availability at the chain tip. Built parallel block execution prototype and maintained the node for 6.5 months in production.

Erigon Go Polygon Network Operations Linux Prometheus MDX Parallel Execution

Arbitrage Bot Developer

Polygon

Mar 2025 - Aug 2026 (1 year 5 months)

Developed and operated Barion, a DEX arbitrage bot on Polygon PoS, achieving 38 successful on-chain transactions. Implemented in-memory AMM math and executor contracts, with a median block-to-submission time of 258 ms.