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havlinj/README.md

Welcome to My GitHub

Here I share architectural explorations, system prototypes, and technical experiments.

For a broader look at how I think about systems and engineering, and the ideas behind it, visit my website.

About This GitHub Account

This is not my first GitHub account.

For several professional years I worked under a separate GitHub account focused on Rust systems developed within a single organization. That work is not directly linked from this profile, but selected examples can be shared upon request.

This account contains work I can share publicly outside proprietary systems.

Repositories here typically represent independent system designs created to explore technologies in depth. They are not tutorial-style examples — the goal is to evaluate technologies in realistic architectural contexts.

I also use these projects to refine my AI-assisted development workflow (Cursor).

Selected System Explorations

  • featureflag-api
    Go · GraphQL · PostgreSQL (completed)

  • personal website
    TypeScript · Astro · Playwright (finalizing)

  • chain-to-cloud-ingestion
    AWS + GCP (Terraform) · Microservices (Go, gRPC) · Solana program · Kafka · Grafana (planned)

Status Legend

(planned) — design stage (in progress) — active development (ongoing) — iterative development (completed) — finished and not actively maintained

Looking Ahead

I tend to have more ideas than time, so new explorations appear gradually. In the future I also plan to start a private commercial project, potentially involving deeper work with Elixir.

Pinned Loading

  1. featureflag-api featureflag-api Public

    Go GraphQL API (gqlgen) for feature flags and A/B experiments: PostgreSQL persistence, JWT-based RBAC, percentage and attribute-based rollout, deterministic variant assignment, and audit logging

    Go

  2. havlinj.github.io havlinj.github.io Public

    Custom Astro + TypeScript personal website with UX-first, visually fresh design, Playwright/Vitest testing, and strong engineering rigor.

    TypeScript