Senior Backend Engineer
I build the financial infrastructure that crypto runs on — from core banking systems and AML pipelines to onchain transaction processing and regulatory compliance engines.
Technologies & Domains
What I know
Years building production systems at the intersection of traditional finance and the blockchain.
Architecture and implementation of ledger engines, payment rails, account management, and reconciliation pipelines for crypto-native and hybrid financial institutions.
Real-time transaction monitoring, rule-based and ML-assisted suspicious activity detection, FATF Travel Rule implementation, KYC/KYB orchestration and SAR filing pipelines.
High-throughput blockchain transaction ingestion, address clustering, UTXO management, EVM/non-EVM chain integration, and real-time balance tracking across custodial systems.
Translating regulatory frameworks into technical requirements — MiCA, VASP licensing, transaction reporting obligations, on-chain data retention, and regulator audit trails.
Freelance
Available for contract, part-time advisory, or full project engagements.
Review, design, and harden your backend for scale, compliance, and security — from greenfield builds to legacy modernisation.
Connect your product to any major chain — node operation, wallet infrastructure, signing services, indexers, and deposit/withdrawal flows.
Build the technical layer beneath your compliance program — screening pipelines, Travel Rule connectors, reporting APIs, and audit log infrastructure.
Independent code and architecture review for investors or acquirers evaluating crypto fintech companies — focused on scalability, risk, and regulatory readiness.
Side projects
Beyond fintech, I build consumer products focused on local communities and human awareness.
A local event radar for the Lubuskie region of Poland, surfacing what's happening around you — concerts, markets, cultural events — in a clean, glanceable feed.
Your day split into 144 visible 10-minute moments. Moje Chwile makes time tangible so you can see if the people who matter most are getting enough of it — before another week quietly slips by.
Contact
Whether you need a compliance engine, a new blockchain integration, or a full backend system — drop me a line.
[email protected]