Backend · Blockchain · Trading systems

Production infrastructure for financial systems.

Stephen Antoni builds backend systems for crypto exchanges, DeFi protocols, and quantitative trading firms — custody, signing, smart contracts, and execution, engineered for reliability where failure is expensive.

View case studies
Stephen Antoni
Stephen Antoni — Backend EngineerAvailable
Core services

Engineered for high-value systems.

End-to-end backend development across four specialized domains — each built for production scale from day one.

001

Blockchain & wallet infrastructure

Full-stack blockchain middleware from node integration to multi-chain wallet systems. Reliable deposit and withdrawal flows engineered for exchange-grade uptime and operational accountability.

Multi-chain walletsNode integrationDeposit / withdrawalPrivate key opsMPCShamirGas optimizationTransaction monitoring
002

Smart contract integration

Custom ICP, Solana, and EVM-compatible contract development with custom PDA account models and production-grade backend APIs that bridge on-chain logic with external systems — Rust, Solidity, and middleware layers included.

ICP contractsSolanaAnchorEVM / SolidityRustAsset swap APIsWeb3.js / Ethers.jsGraphQL blockchain APIs
003

Trading automation

High-performance execution systems for forex, commodities, and equities. From sub-millisecond scanners to full backtesting frameworks and risk management modules — built in Rust, C++, Python, and MQL4.

Stock scannersForex botsBacktestingRisk managementMQL4 / PineScriptRustC++ / Python
004

AI & machine learning

Applied ML for financial signal generation — LSTM price predictors, reinforcement learning traders, NLP sentiment engines, and full feature pipelines from data to prediction API deployment.

LSTM / deep learningReinforcement learningNLP sentimentFeature engineeringTensorFlow / PyTorchKerasModel ensemble
Technical depth

The stack behind the systems.

Production-hardened languages and tooling across systems programming, backend services, and financial automation.

Languages

01
C / C++PythonGolangRustTypeScriptJavaScriptPHPElixirMQL4PineScript

Backend & APIs

02
Node.jsgRPCGraphQLREST APIsMiddlewareRabbitMQMonorepo development

Blockchain & Web3

03
ICPEVM / SoliditySolana / AnchorTON / FunCWeb3.jsEthers.jsMPC / ShamirWallet middlewareNode integration

AI & machine learning

04
TensorFlowKerasPyTorchScikit-learnXGBoostLightGBMNLTKReinforcement learningFeature engineering

Data & storage

05
MySQLPostgreSQLMongoDBRedisDuckDBPandas

DevOps & infrastructure

06
DockerLinux / UnixGitOpen-TelemetryOperational alertingMining infrastructure
Selected systems

Production systems, shown in context.

Eight case studies across custody, signing, contracts, quant research, machine learning, execution, and mining operations.

Coverage
01Custody and wallet infrastructure
02Quant research and execution systems
03Smart-contract and signing controls
04Mining operations and thermal controls
Notable works
001Go / Shamir / gRPC / Web3 / NodeJS

Multi-Chain Wallet Service

Custodial wallet service for multi-chain deposits, pooled wallets, and outgoing transfers, built with stable APIs and layered signing controls.

Evidence
Incremental blockchain indexing for reliable deposit detection.
Custodial wallet pooling with sharded wallet generation through MPC.
Multi-party signing for withdrawals with validation before broadcast.
Stable wallet interfaces such as balance, address creation, deposit listing, address validation, and transfer.
Adapter model that can support more than ten protocol integrations without changing upstream callers.
ArchitectureSystem diagram
readswritesapprovedindexed stateCustomer requestThe user or customer interacts with the custodial service, not directly with wallet internals.Custodial serverThe server owns product-facing requests and calls stable wallet interfaces.Wallet serviceA durable Go service routes balance, address, deposit, and transfer operations.Chain adapter layerProtocol adapters normalize chain-specific indexing, address rules, fees, and broadcast behavior.ValidationserviceTransfer requests pass business, risk, and security checks before any signature is released.Signing service (MPC)Multi-party signing and MPC-backed shards produce a signed transaction without weakening custody controls.Blockchain broadcastThe wallet broadcasts signed transactions and indexes final chain state back into custody records.
Products · ChartSentry

Tools I built, shipped as products.

The same engineering discipline, packaged: non-repainting MetaTrader 5 indicators — every object stamped on a closed bar and never rewritten — sold under my product brand, ChartSentry.

01

TrueSMC

A five-module smart-money suite for MT5 — market structure, order blocks, fair value gaps, liquidity and premium/discount zones from one engine, with a repaint test you can reproduce before buying.

View on ChartSentry →
02

TrueSMC Lite

The structure module, free — confirmed swings, BOS and CHoCH on closed bars. The honest way to verify the engine's no-repaint guarantee yourself.

Get it free →
03

Pattern Sentinel

The Core 12 classical chart patterns, machine-verified no-repaint, quality-scored, with every historical call — wins and losses — kept on the chart as a permanent track record.

See the catalog →

Custom MT5 indicator and expert advisor development is also offered through ChartSentry — chartsentry.net →

Available for new engagements

Ready to build mission-critical systems.

Blockchain infrastructure, trading automation, or AI-driven financial systems — scope the work, then deliver it right.

github.com/luxeaveLinkedIn[email protected]