For founders, product leads, and small product teams

A clear path to your next release

Work directly with a Senior Full-Stack Product Engineer who helps you decide what comes next, connect product and engineering decisions, and make the path to release clear.

Schedule a meeting

When the product has outgrown "it works," ownership needs to catch up.

You may have a working prototype, a live product, or a consequential next release. The harder question is who owns the connected product, system, verification, and release decisions needed to move it forward.

When those decisions remain split or keep falling back to you, the product can be working while its next state is still difficult to define, verify, release, or hand off.

The next outcome keeps reopening

Priorities, scope, and completion criteria are not yet owned as one product decision.

Product and system decisions are separated

UX, application, integration, infrastructure, and release choices are handled as disconnected tasks.

Verification is hard to see

It is not clear what evidence will show that the agreed state is ready to release or hand off.

A working product can still be difficult to trust, release, or evolve.

Without a clearly owned next state, decisions can keep reopening, context can disappear between handoffs, and verification can remain implicit. The result is not necessarily a failed product. It is a product whose next move remains harder to coordinate and trust than it should be.

Rework pressure

A decision made in one part of the product can create new questions elsewhere when no one owns the connected state.

Hidden release risk

If completion evidence is not explicit, a build can look finished while important assumptions remain untested.

Founder or product-lead coordination load

Product and engineering ownership can keep returning to the person already carrying the business or product context.

Direct senior ownership for the agreed next state.

You should not have to translate the same product consequence across disconnected tasks or carry every product and engineering decision yourself.

I am Xavier Perez, a Senior Full-Stack Product Engineer and independent product partner. I work directly with founders and product teams to clarify the next owned outcome, connect decisions across the agreed scope, and make the evidence for release or handoff visible.

My strongest public proof is a long full-stack production record, dated platform trust signals, client feedback about how I work, and an approved end-to-end product case. I use AI-assisted tools where they help, while remaining accountable for judgment, verification, and the delivered work.

A clear path to the agreed next state.

1. Bring the current state and consequence

Share what exists now, who it serves, what the next outcome needs to change, and why that outcome matters.

2. Define the owned outcome and boundaries

We establish the product state to own, the decisions inside and outside the engagement, and the evidence that will count as complete.

3. Connect, verify, release or hand off

I carry the connected product and system decisions within the agreed scope, make verification visible, and release or hand off the agreed state.

The exact engagement depends on the product state and agreed scope. This plan does not promise a fixed diagnostic, duration, price, turnaround time, or permanent product outcome.

A production track record you can inspect.

Senior product ownership, backed by at least nine years of full-stack production delivery.

Dated Upwork record

As captured on 2026-09-04: 29 total jobs, 28 completed jobs, one job in progress, 15,309 hours, 100% Job Success, and Top Rated Plus.

29

Total jobs

15,309

Total hours

100%

Job Success

Top Rated Plus

Upwork status

What public client feedback supports

Public feedback supports a pattern of autonomous work, reliability, clear communication, testing discipline, UX judgment, maintainable engineering, and contribution from early ideas through a working product.

Full-stack production experience

At least nine years of delivery across product interfaces, application systems, integrations, testing, and cloud infrastructure.

AI-assisted delivery with accountable judgment

AI tools support research, implementation, and review where appropriate. Xavier remains responsible for decisions and verification. The AWS Certified AI Practitioner credential supports foundational AI knowledge, not proof of production agents, RAG, evaluations, or regulated-AI systems.

What public client feedback supports

Just like the last time we engaged with him, Xavier helped us out reliably and efficiently. He specifically supported us in improving our unit and integration tests integrating emulators for our backend services into the test process.-- Johannes Stiehler

Xavier is a talented frontend developer, who supported our project for months and took our ideas from a google doc to an actual product/prototype. Xavier is fun to work with, a great team player and very accountable. We are a remote team, and Xavier just fit right into our team culture.-- Karan Dhingra

Xavier is a talented software engineer who took our React/Redux project from 0 to 100 in record time. Xavier was able to quickly and expertly solve every problem we came across throughout the development process, which has resulted in a stellar end product. He has an eye for design and UX that sped up development significantly.-- Jake Glass

Xavier was an invaluable part of our team, using his React expertise to bring pixel perfect screens to life as promised. Of all of the React developers we've worked with - on Upwork and otherwise - Xavier was one of the very top engineers with whom we've been lucky enough to have on our team.-- Alli McKee

Xavier is not a typical fly-by freelancer, his commitment to success of our project was amazing. Xavier's technical skills especially in React application development can be compared to a world class developer. His methodical approach to writing code resulted in a easily maintainable code that my company can continue to use it as an asset going forward. Xavier's work ethics is one of the best I have seen across all kinds of staffing models, he is very direct and gives honest feedback on ideas that he thinks will work or not work.-- Sanjay Mahadi

Xavier was an outstanding addition to the team. Easy to work with, great communication. We asked Xavier to help us with our complex Node.js web app working with React, Relay, and GraphQL. He ramped up on our application very quickly and immediately added value to the project... It was as if he had been a member of the team all along. Worked efficiently and followed development processes like a true professional. We would definitely hire Xavier again in the future-- Adam Tratt

Does your working product need clearer ownership for its next state?

Bring the current product state, the outcome that matters next, and where ownership is unclear. An initial conversation will establish whether direct senior ownership fits the work.

Schedule a meeting