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havlinj/README.md

System Explorations

Distributed systems · Software architecture

Software rarely exists in isolation.

The projects here explore technologies in the context of larger systems, where integration, boundaries, reliability, and operational concerns become part of the engineering challenge.

Modern software is built from many moving parts. These explorations are a way to better understand how those parts interact and how architectural decisions shape the resulting system.

Selected Projects

Blockchain Governance Platform

Ongoing exploration of a distributed system integrating on-chain governance workflows with cloud-native event processing, messaging, and analytics across AWS and GCP.

Solana (Anchor, Rust, commit–reveal, Merkle allowlist) AWS (SNS/SQS, Lambda, DynamoDB) · GCP (Pub/Sub, BigQuery) Go · gRPC · Terraform · Kafka · Grafana · LiveView

Feature Flag API

Feature flag management service focused on API design, persistence, and operational simplicity.

Go · GraphQL · PostgreSQL

Personal Website

Ongoing development of a personal website and writing platform.

TypeScript · Astro · Playwright

Rust

Public repositories on this profile do not reflect several years of professional Rust development. Selected examples of professional work are available upon request.

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

  3. chain-to-cloud-ingestion chain-to-cloud-ingestion Public

    Multi-cloud, event-driven voting: Solana on-chain events → AWS (ops projection) → GCP (analytics). CQRS, Terraform, microservices.

    TypeScript