I will be your expert full stack developer for custom saas and api

It goes in from week one, not after a review. Passwords hashed, JWT or OAuth sessions that expire, every input validated on the server, rate limiting on public endpoints, tenant data isolated per account, and secrets in environment config rather than the repository.

Backups are configured before launch, not after the first incident, and migrations are version-controlled so a bad deploy can be rolled back. You own the database and the cloud account, so nothing about recovery depends on me being reachable.

What breaks first is usually queries, not servers. I index and paginate from the start, cache what gets read often, and move slow work to background jobs once the numbers justify it. That absorbs most growth without re-architecting anything.

Yes, and it's common. I start with a short audit of the code, infrastructure and deployment, then give you a straight assessment of what's solid, what needs work, and in what order, before quoting the build.

Node.js, React, Next.js and Express with MongoDB or MySQL. Deliberately boring and proven: every hard problem already has a mature answer, and you can hire for it anywhere. Your product should be differentiated by its workflow, not by an exotic framework choice.

If it's architected sensibly from the start, clean module boundaries, tenant-aware data models, cloud-ready deployment. Most applications need disciplined engineering rather than exotic infrastructure. I add caching and background jobs when real load justifies it, not before.

Yes, code, repositories, database and cloud accounts are yours, with IP transferring on final delivery. No lock-in, and the handover documentation makes moving in-house practical.

Both. Fixed price when the scope is clear, hourly for ongoing work or open-ended discovery. I'll recommend whichever is honestly cheaper for you.