Services
I take on freelance and contract work where the hard part is the engineering, not the ticket queue.
What I do
Full-stack product work
React and TypeScript on the front, Node, Express and MongoDB behind it. Typed end to end, tested, and deployed somewhere you can actually watch it run.
Authentication and authorization
OAuth2 and OIDC flows, token rotation, RBAC, session handling and audit trails. I have built an identity provider from scratch and run it in production.
AI and LLM systems
Retrieval that answers the question actually asked, agents that finish the task, and evaluation so you know when a change made things worse.
Rescue work
The feature that was handed back twice. I would rather learn the thing properly than route around it, which is usually what it takes.
How I work
- 1
Scoped in writing first
Before any code, you get what I am building, what I am explicitly not building, and what would change the estimate.
- 2
Visible from day one
Small commits against a running deployment. You see progress without asking for a status update.
- 3
Built to hand over
Typed, tested and documented so the next person — including you — can change it without calling me.
Proof
Yesodot Eitanim is client work, delivered end to end and still running.
Read that case studyHow to start
Send a short description of the problem and the constraint that matters most — budget, deadline, or something that already failed once. You get a reply with a plan and a range, not a sales call.
Describe your project