octabits
Reynt, a multi-tenant booking SaaS in production. octaflow, a durable workflow engine that runs on the Postgres you already have. A cert-manager solver holding up other people’s wildcard certificates. One architect, twenty-five years in.
Products
Reynt is a multi-tenant rental and booking SaaS running in production — thirteen packages, four APIs, three frontends, architected and written end to end by one person working with AI agents. The reusable parts of it are extracted, published and maintained as open source.
Engagements
Architecture reviews, greenfield system design, and hands-on full-stack delivery — TypeScript, .NET, Kotlin, Go, Kubernetes. Most recently a cross-state public-sector platform for three German states. Available for selected engagements, remote or around Stuttgart.
In the open
Extracted from work that shipped, not written to be extracted. Each one is documented, tested and honest about its limits.
Library · TypeScript
Durable workflows on the Postgres you already have.
Declare a DAG of Zod-typed steps. The engine runs each step as soon as its dependencies complete, persists every transition, retries failures, and picks up where it left off after a restart.
MITPre-1.0 · actively developed
Monorepo · TypeScript
The building blocks underneath everything else.
Two packages extracted from real products: an opinionated server framework toolkit and a Nuxt/Vue kit for admin SPAs. Everything heavy is an optional peer — you install only what you import.
MITPre-1.0 · published to npm
Kubernetes webhook · Go
Wildcard certificates for Porkbun domains on Kubernetes.
A cert-manager ACME DNS-01 solver for domains hosted at Porkbun, which cert-manager has no built-in solver for. A maintained fork of an abandoned upstream — rewritten, hardened, and tested.
Apache-2.0Released · maintained
In production
Product
A multi-tenant rental and booking platform, made in the EU.
A production SaaS for holiday rentals and bookings — storefronts, offers, payments, invoicing and compliance — architected and built end to end by one person with AI agents.
ProprietaryIn production
Reynt, by the numbers
How we work
Tenant isolation enforced by row-level security, not by remembering a WHERE clause. Framework code kept out of the domain by a test that fails when it creeps in. The rule you can break is not a rule.
A durable workflow engine that needs only the Postgres you already run. A static site with no analytics and no cookie banner. Every dependency is an operational commitment — most of them are not worth it.
Every project here ships a "when not to use this" section and a comparison table that names what it loses to the alternatives. Trust is built by being right about your own weaknesses.
Reviews, designs, or building the thing outright. Mail is the fastest way through.