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havlinj/README.md

Build Until It Makes Sense

Who's Jan?

My dad used to call me a “Renaissance man” as a joke. I secretly liked it.

Projects show what I build. My website shows more of who I am.

Selected Work

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

Where's All the Rust?

This profile doesn't fully reflect several years of professional Rust development. Selected examples of that 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