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havlinj/README.md

Why Software?

Of all the creative mediums I've worked with, software turned out to be my favorite.

Building with it requires almost no physical material, yet it allows us to create things with extraordinary real-world impact.

Once the hardware exists, thought becomes the primary building material. Few creative mediums let us move from imagination to reality with so little friction. I haven't found another one quite like it.

That's why I've stayed.

The more I've come to appreciate what software makes possible, the more seriously I've come to take software engineering. I've always felt it deserved that kind of respect.

Who's Jan?

My dad used to call me a "Renaissance man." I secretly liked it.

I've never been able to confine myself to a single discipline. Yet software is the only one I've chosen to pursue professionally.

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

Selected Work

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

Go · GraphQL · PostgreSQL

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