Oleksandr Zalizniak

Software Engineer & Backend Architect. This is my corner of the web.

About Me

I’m Oleksandr. Right now I’m building Signus.ai, an AI-native contract intelligence platform powered by Sigi, an AI legal agent for generating, signing, analyzing, and tracking agreements at scale.

I spent 20+ years as a backend architect and full-stack engineer — designing cloud infrastructure and microservices on AWS across SaaS, e-commerce, finance, and telecom, most recently leading backend architecture at UserWay.

I’m based in Upstate, NY.

What I’ve Done

Applied AI engineering — LLM agents and contract intelligence.
Backend & cloud architecture — resilient services (Java, Node, Spring, Nest) and AWS at scale, under heavy traffic.
Technical leadership — cross-functional teams from idea to production.

SpecCraft building

SpecCraft is what I’m building next: tooling to understand, verify, and test complex concurrent and durable-execution workflows — the systems where the dangerous bugs live in event interleavings no test suite ever samples, and where no existing tool both comprehends the logic and checks it.

Temporal & Durable Execution

Temporal is the substrate SpecCraft targets. After ~1 year building on it, I’m convinced workflows-as-code is the right default for anything that has to survive crashes, retries, and long waits — but I hit its sharp edge firsthand: complex workflows with many interleaving handlers become genuinely hard to reason about, test, and trust. Closing that gap — going deep on Temporal and Go — is my current priority.

Let’s Connect

Whether you’re looking for a technical lead for your next project, someone to brainstorm innovative solutions, or just want to chat about the latest in tech, I’d love to connect.

Email: alex@zalizniak.com · LinkedIn · GitHub