// senior full-stack engineer — direct, no agency

I build the backend your product runs on.

Payments, crypto rails, marketplaces, and LLM pipelines — designed, shipped, and run end to end. Ten years in production; crypto since 2018.

~/polycratia — zsh

Book a 20-min call Start a paid task

what i do

One engineer, whole systems

./payments

Payments & fintech

Payment processing, virtual-account ledgering, KYC/KYB & AML, e-signatures, white-label checkout, lending with scoring.

./crypto

Crypto & web3

Wallets, exchange mechanics, BTC/ETH/USDT rails, fiat-to-crypto onramps with KYC, tokenized assets on Ethereum.

./commerce

Marketplaces

Catalogs and parsers, multi-carrier delivery, order lifecycle, role-based apps, AI catalog localization.

./ai

AI / LLM

LLM pipelines in production: localization at scale, OCR and data extraction, scoring models, RAG over your data.

./rescue

Legacy rescue

Python 2→3 migrations, monolith→microservices, taking over undocumented systems and making them maintainable.

./ship

End-to-end

Architecture, implementation, deploy, and keeping it alive in production — I own the whole service layer.

selected work

Systems I've shipped & still run

3.5 yrs

Aircraft deal platform

I built KYC/KYB verification, in-platform document signing, client-to-client transaction services, a tokenized deal lifecycle on Ethereum, and multi-channel notifications (WhatsApp, Telegram, push, WebSocket).

EthereumKYC/KYBe-signWebSocket

5th yr

Cross-border e-commerce

I run the full service layer of a marketplace: payment services including stablecoin (USDT) rails, LLM catalog localization at scale, retail parsers, and multi-carrier delivery integrations.

USDTLLMParsersDelivery

3 yrs

P2P lending ecosystem

I built the loan marketplace core — order books, multi-investor deals — with virtual bank-account ledgering, in-house scoring models, legally binding e-signatures, collections automation, and real-time support tooling.

LedgerScoring MLe-signCollections

$25M ICO

Blockchain ecosystem

Inside an ecosystem that raised $25M, I built an exchange with order books, custodial BTC/ETH wallets, and a fiat-to-crypto purchase flow with real-time KYC moderation.

ExchangeWalletsBTC/ETHOnramp

stack

Production experience — not theory

languages

PythonGoTypeScriptJavaScriptSoliditySQLBash

frameworks

DjangoFastAPIFlaskaiohttpCeleryReactReact Native

data & infra

PostgreSQLMongoDBRedisElasticsearchRabbitMQDockerAWSCI/CD

web3 & ai

BitcoinEthereumSmart contractsLLM APIsRAGVector DB

how i work

Direct, and judged on shipped code

Direct line.You talk to me — the person who writes the code. No agency, no account manager, no relay.
Judge me on work.Start with a small paid task. Scale up only if you like what ships. I'd rather show you than tell you.
End-to-end ownership.Architecture → production → keeping it alive. I own the service layer, not just tickets.
Honest estimates.Explicit assumptions, transparent scope, no surprises. When something's risky, you hear it first.
Flexible payment.Wire transfer, card, or stablecoins (USDT) — whatever fits your operation.

proof

Show, don't tell

Most of my work lives in private client codebases under NDA, so there's not much to link. Public code samples are on the way. Until then, the fastest proof is a small paid task — give me something real and judge me on what ships, not on a portfolio page.

Start a paid task