# Ou David | Systems Engineer

> Software Engineer focused on building reliable, high-availability distributed systems.

Ou David's public portfolio and technical writing. Pages are available as HTML and Markdown. The links below are generated from the site's published content.

## Start here

- [Home](https://vvivid.dev/): Profile and recent posts. [Markdown](https://vvivid.dev/index.md).
- [Ou David](https://vvivid.dev/about/): [Markdown](https://vvivid.dev/about/index.md).
- [Projects](https://vvivid.dev/projects/): [Markdown](https://vvivid.dev/projects/index.md).
- [Backend engineering articles](https://vvivid.dev/posts/): [Markdown](https://vvivid.dev/posts/index.md).

## Posts

- [What Really Happens When You Run a Shell Command?](https://vvivid.dev/posts/process_api_behind_every_shell_command/) · [Markdown](https://vvivid.dev/posts/process_api_behind_every_shell_command/index.md) · 2026-06-15
  How three UNIX process primitives make execution, redirection, and pipelines possible.
- [String Concatenation vs strings.Builder in Go](https://vvivid.dev/posts/go_string_concat_vs_string_builder/) · [Markdown](https://vvivid.dev/posts/go_string_concat_vs_string_builder/index.md) · 2026-06-13
  A small Go benchmark showing when repeated string concatenation becomes expensive and how strings.Builder changes the allocation profile.
- [The Trap of Vibe Coding for Juniors](https://vvivid.dev/posts/the_trap_of_vibe_coding_for_juniors/) · [Markdown](https://vvivid.dev/posts/the_trap_of_vibe_coding_for_juniors/index.md) · 2026-01-27
  Why AI-generated code becomes risky when juniors cannot judge the design, failure modes, or maintenance cost.
- [Handling Fractional Cents in Integrations](https://vvivid.dev/posts/handling_fractional_cents_integration/) · [Markdown](https://vvivid.dev/posts/handling_fractional_cents_integration/index.md) · 2026-01-21
  How a design flaw in POS integration led to a 0.01 Euro discrepancy and how we solved it.
- [The Silent Timezone Mismatch: Go vs MongoDB](https://vvivid.dev/posts/the_silent_timezone_mismatch_go_vs_mongodb/) · [Markdown](https://vvivid.dev/posts/the_silent_timezone_mismatch_go_vs_mongodb/index.md) · 2026-01-16
  How implicit conversions between primitive.DateTime and time.Time can cause subtle bugs.
- [Building a JSON-RPC Server in Go: Complete Implementation Guide](https://vvivid.dev/posts/jsonrpc_example/) · [Markdown](https://vvivid.dev/posts/jsonrpc_example/index.md) · 2025-08-30
  Learn how to implement a complete JSON-RPC 2.0 server in Go with message parsing, validation, method routing, and error handling. Includes working calculator example.
- [Understanding JSON-RPC: The Protocol Behind MCP](https://vvivid.dev/posts/json_rpc_the_protocol_behind_mcp/) · [Markdown](https://vvivid.dev/posts/json_rpc_the_protocol_behind_mcp/index.md) · 2025-08-24
  Breaking down JSON-RPC to understand how MCP (Model Context Protocol) works under the hood
- [The HTTP Request Journey in Go: From Network to Handler](https://vvivid.dev/posts/http_in_golang/) · [Markdown](https://vvivid.dev/posts/http_in_golang/index.md) · 2025-08-08
  Tracing the complete journey of an HTTP request through every layer of the Go stack


## Projects

- [Go Language Case Studies](https://vvivid.dev/projects/go-lang-case-study/) · [Markdown](https://vvivid.dev/projects/go-lang-case-study/index.md) · 2026-06-13
  A public collection of focused Go case studies, tests, and benchmarks for practical backend engineering topics.


## Access and discovery

- [Access information](https://vvivid.dev/auth.md): Anonymous public reading; no registration or API credentials.
- [Content API](https://vvivid.dev/api/content.json): Published page metadata as JSON, for local search and filtering.
- [API documentation](https://vvivid.dev/api/), [OpenAPI description](https://vvivid.dev/api/openapi.json), and [API catalog](https://vvivid.dev/.well-known/api-catalog).
- [Public skills](https://vvivid.dev/.well-known/agent-skills/index.json): Instructions for finding, reading, and citing articles, with artifact digests.
- [RSS feed](https://vvivid.dev/index.xml): Published posts.
- [Sitemap](https://vvivid.dev/sitemap.xml): Published page URLs.

Request `Accept: text/markdown` on a page URL, or use its linked `index.md` resource. Ordinary browser requests receive HTML. The content API accepts anonymous GET and HEAD; the site has no write endpoint, hosted MCP server, or authorization server. OAuth/OIDC discovery and client registration are not applicable.