Микола

Mykola Zadorozhnyi | Senior Software Engineer (.NET)
Ukraine, Remote
e-mail: [відкрити контакти](див. вище в блоці «контактна інформація»)
GitHub: https://github.com/alokym86

Profile:
.NET developer with expertise in real-time systems, third-party integrations, and
performance-sensitive applications. Contributor to open-source .NET crypto libraries. Drawn
to problems where the right approach isn't obvious — the kind that feel more like a logic
puzzle than a checklist.

Employment history:
• Oct 2024 – present | Senior .NET developer | LQ-Labs
◦ Owned the core trading strategy execution engine end-to-end
◦ Designed and implemented an automated options rolling strategy engine from
scratch — a 19-state finite state machine covering the full lifecycle of options
positions: initialization, opening, take-profit and stop-loss contract rolling,
roll-back, expiration with configurable retry logic and exponential backoff
◦ Redesigned per-subscription one-way gRPC streams into long-lived bidirectional
streams per data type — cutting concurrent connections per client from ~150 to 3,
and eliminating throttling-induced spikes of up to 2,500 dropped messages/sec via
latest-value deduplication and a lock-free hot path
◦ Architected scoped DI container per trading bot and per subaccount, ensuring
complete execution context and credentials isolation between concurrent
strategies in a multi-tenant environment
◦ Mentored less experienced colleagues
◦ Migrated core trading infrastructure from Azure (Container Apps + Service Bus) to
VPS (Docker Compose + RabbitMQ), cutting monthly infrastructure cost by ~85%
while preserving reliability

• Apr 2024 – Oct 2024 | .NET developer | Peanut Trade
◦ Optimized existing arbitrage strategies to improve execution profitability (CEX-to-
CEX)
◦ Developed a CEX-to-CEX HFT arbitrage bot with sub-50ms execution requirements
◦ Built a proof-of-concept CEX-to-DEX arbitrage bot integrating Injective Protocol;
identified node latency as the root cause of false arbitrage signals, which informed
the decision to discontinue the approach

• Jan 2024 – Apr 2024 | .NET Developer | Freelance
◦ Developed a WebSocket server with JSON-RPC protocol integration
for IoT equipment at fuel stations
 • Jan 2022 – Oct 2023 | Junior .NET developer | Algorithm-Plus.com
◦ Developed a custom Retail Management System for pharmacy chains, leveraging
prior domain expertise as a licensed pharmacist

• Jan 2019 – present | Java developer | Side project (self-employed)
◦ Designed and developed a custom Retail Management System used for inventory
management, sales processing, customer management and reporting

Making world better:
Contributed features, bug fixes to popular .NET cryptocurrency libraries including:
CryptoExchange.Net · Kucoin.Net · GateIo.Net. Also, contributed new exchange client
implementations: Kuna.Net · Bitmex.Net · WhiteBit.Net
* you can find more on my GitHub.

Skills:
• Languages & Frameworks
◦ C#, .NET, ASP.NET Core, EF Core
• Data
◦ SQL: Oracle11g, MySQL, SQL Server
◦ Redis
• Messaging & Communication
◦ REST, WebSockets, gRPC, Protocol Buffers, Azure Service Bus, RabbitMQ
• Cloud & DevOps
◦ Azure Container Apps, Azure Blob Storage, Azure Key Vault, App Configuration
◦ CI/CD (GitHub Actions)
◦ Docker Compose
• Testing
◦ xUnit, Moq
• AI-assisted development
◦ Claude Code, Cursor
• OS
◦ Linux