Developer breaks down why event-driven architecture beats polling in algorithmic trading

·1 views

A software developer published a technical breakdown on DEV Community comparing naive polling-based market-making code with an event-driven, WebSocket-based alternative for high-frequency trading (HFT). The article explains that REST polling approaches introduce 150–250 milliseconds of latency, making them unsuitable for millisecond-scale trading strategies. The author argues that the key differentiator in HFT is not programming language choice but architectural decisions such as avoiding blocking calls, eliminating unnecessary data copies, and using asynchronous I/O. Side-by-side Python code examples illustrate how switching from timed HTTP requests to real-time WebSocket streams significantly reduces the delay between receiving market data and placing an order. The piece concludes that an event-driven pipeline — where the system reacts instantly to incoming data rather than querying on a fixed schedule — is the foundation of competitive low-latency trading systems.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

VoidZero Launches Vite+ Beta for Enhanced Web Development

VoidZero has announced the beta release of Vite+, an evolution of the popular Vite front-end build tool. The beta is now available for developers to test and provide feedback. Vite+ aims to build upon the existing Vite ecosystem with additional capabilities and improvements. The announcement was made via VoidZero's official blog at voidzero.dev. Details about specific new features are outlined in the official release post.

0 comments Read more at Hacker News

ProgrammingDEV Community ·

How AI coding agents rack up costs through small, reasonable-seeming decisions

Agentic coding tools can become surprisingly expensive not through obvious mistakes but through many individually justifiable micro-decisions that accumulate over time. A developer analyzing their own billing identified five key cost drivers: keeping too many files in the main agent's context, reading more files than necessary, using powerful frontier models for simple lookup tasks, generating long outputs inline instead of delegating to cheaper sub-agents, and allowing context bloat that silently inflates costs on every subsequent turn. Because each decision feels harmless in the moment, the author argues that personal discipline alone cannot solve the problem. Instead, they built a structural solution comprising a per-tool-call spending hook, a model router, and a parent-child agent delegation system. Notably, the cost-cutting measures also improved output quality by keeping the main agent more focused and accurate.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Open-Source Blazor JWT Starter Template Released for .NET 10 with Radzen UI

A developer has published a production-ready open-source starter template that demonstrates secure JWT authentication in Blazor applications built on .NET 10. The template combines JWT Bearer authentication for API communication with cookie-based authentication for the Blazor front end, alongside Radzen UI components. It follows a clean layered architecture separating Domain, Application, Infrastructure, and Shared concerns. The project includes a WebAPI acting as a JWT token authority and a Blazor Server app handling user sessions via secure HttpOnly cookies. The template is aimed at developers looking to skip repetitive authentication boilerplate when building enterprise or experimental Blazor applications.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

How Durable Execution with DBOS Delivers Exactly-Once Automation in TypeScript

A developer migrated 34 production automations from a no-code visual platform to TypeScript, citing durable execution with exactly-once semantics as the key motivation. Traditional automation tools typically offer retry-on-failure, which risks re-executing side effects like sending messages or writing records when a process crashes mid-workflow. DBOS addresses this by checkpointing each completed step in Postgres, so if a workflow crashes between steps, it resumes from where it left off rather than restarting entirely. The framework uses TypeScript decorators to distinguish workflow orchestration logic from individual steps, enforcing a rule that steps are never re-executed once recorded as complete. This approach eliminates the need for manual idempotency keys and progress-tracking boilerplate, reducing automation code to pure business logic.

0 comments Read more at DEV Community