Weverson Mamédio

Senior Product Engineer

Weverson Mamédio

Senior Product Engineer · AI-Native · Product · UX · Design · SaaS & Fintech · LLMs · Agentic Systems

TypeScript Node.js Next.js React Python LLMs Agentic Systems BMad Method

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15+ years experience

$5M+ revenue generated

20+ apps shipped

"What sets him apart is how he seamlessly combines UI
and UX considerations with robust functionality."

· George C. Huang, M.D., Profit Stash

Selected Work

HYPHEN AI · INVESTOR DASHBOARD

High-performance investor portal built from scratch for a fintech platform. Implemented SPA architecture that cut page load from 3s+ to under 1s, and designed the data visualization layer for real-time portfolio metrics with a focus on performance and clarity.

PROFIT STASH · FINANCIAL PLANNING SaaS

Core product work on a financial planning SaaS over a 2+ year engagement. Redesigned the core dashboards, optimized performance by 60%, rebuilt the formula engine comparing goals vs. actuals, and shipped financial calculators that improved retention.

WENOMAD · NOMAD CITY GUIDE

Proposed and built a live map search that changed how users explored cities. It became the platform's signature feature. Also improved filters, responsive design, and integrated AirTable, weather, and Unsplash APIs.

CURLY SISTER · DIRECTORY & PHOTO AI

Suggested and built an AI haircut visualizer that became the platform's most-used feature. Also added Stripe subscriptions, improved SEO, and converted the full site to a responsive engine.

JESSIE · AI THERAPIST CHAT

Built an AI therapy chat platform with SEO-optimized blog content. Focused on performance, accessibility, and a calm UX that earns user trust fast.

GNT · PICKLEBALL CLUB MANAGER

Architected the database and built the full feature set: ELO-based player rankings, game scores, and events management. Pixel-perfect implementation matching the provided Figma design.

BRUSH'N'SHADE · FIGURINE MARKETPLACE

Took a bare template and built it into a full-featured marketplace. Product options, shipping, in-chat image uploads, payment verification, and reviews.

KAPYTAL · CRYPTO PLATFORM

Built a live crypto trading platform. Integrated Binance API for real-time data, SMS-based authentication flow, and designed and implemented the full UI from scratch.

NAIL SALONS · SCHEDULING APP

Built a full salon scheduling platform from scratch. Native Stripe subscriptions, booking system, and improved UX beyond the original brief.

QuickBooks API Integration

MARGANON · B2B API INTEGRATIONS

Built the API integration layer for a real estate brokerage connecting Sierra Interactive CRM with QuickBooks accounting. End-to-end bi-directional sync handling OAuth authentication, invoice generation, and payment data across systems. Automated back-office flows that cut duplicate records and reconciliation overhead.

MySQL Data Migration

HK · DATABASE MIGRATION & AI SYNC

Database migration and AI-assisted data sync project for a restaurant tech platform. Fixed the PostgreSQL to MySQL sync pipeline across multiple tables with ~1M records each, enabling Metabase reporting on live operational data. Built Python and AI scripts for cross-database comparison and bulk extract/update flows.

AI Emotion Analysis

QSTAC · AI SURVEY ANALYTICS

AI-powered survey analytics platform for analyzing internal company feedback at scale. Built pre-GPT-4, integrated early-generation GPT for emotion analysis on thousands of survey responses, with CSV import/export and dashboards surfacing sentiment trends across companies.

Let's Work Together

What Clients Are Saying

10/10, by far the most enjoyable experience I've had with a freelancer. Weverson took the time to understand my business and what the high level, big picture was, and then delivered everything we asked on time. Most importantly, he is a delight to work with. Very happy we hired Weverson.

BEN BRENNAN

QSTAC

What sets him apart is how he seamlessly combines UI and UX considerations with robust functionality. Honest, dependable, detail-oriented, communicative, and highly experienced. For business owners and entrepreneurs looking for a developer who truly understands both the technical and user experience sides of app development, I can't recommend Weverson highly enough.

GEORGE C. HUANG

Profit Stash

I have worked with Weverson for the last 2 years on my business, Curlysister.com. He has been responsive and helpful. I will continue to work with him every chance I can. He is a solid developer and problem solver.

PHOEBE ASH

CurlySister

One of the best people I've worked with. He's responsive, creative, works autonomously, and is easy to talk to. He significantly improved the app I was building with his own ideas for speed and design. Would highly recommend.

BENJI EISENBERG

Harmonic Intelligence

He had skills far beyond what we hired him for. He owned the entire process. 5 stars, A++++++

JEFF M.

Investors Dashboard

10/10, by far the most enjoyable experience I've had with a freelancer. Weverson took the time to understand my business and what the high level, big picture was, and then delivered everything we asked on time. Most importantly, he is a delight to work with. Very happy we hired Weverson.

BEN BRENNAN

QSTAC

What sets him apart is how he seamlessly combines UI and UX considerations with robust functionality. Honest, dependable, detail-oriented, communicative, and highly experienced. For business owners and entrepreneurs looking for a developer who truly understands both the technical and user experience sides of app development, I can't recommend Weverson highly enough.

GEORGE C. HUANG

Profit Stash

I have worked with Weverson for the last 2 years on my business, Curlysister.com. He has been responsive and helpful. I will continue to work with him every chance I can. He is a solid developer and problem solver.

PHOEBE ASH

CurlySister

One of the best people I've worked with. He's responsive, creative, works autonomously, and is easy to talk to. He significantly improved the app I was building with his own ideas for speed and design. Would highly recommend.

BENJI EISENBERG

Harmonic Intelligence

He had skills far beyond what we hired him for. He owned the entire process. 5 stars, A++++++

JEFF M.

Investors Dashboard

Weverson is an incredibly gifted developer. In addition, he has excellent communication skills. I think what sets him apart are his world class UI/UX skills. Highly enjoyed working with Weverson and hope to work again with him in the future!

JEFF G.

Cleeri

The communication is so fluid and pleasant, his ideas are worth their weight in gold, his speed of execution is perfect, the fact that he is involved and creates a real bond with the project.

JEFF P.

Brush'n'Shade

Quickly understood our requirements and expertly delivered on them ahead of schedule.

LOUIS

TruNarrative

Very talented developer who communicates well, is reliable, and thinks entrepreneurially which means he'll present ideas and offer suggestions on how to improve existing ideas.

CAMERON W.

WeNomad

Absolute pleasure to work with. Very clear and knowledgeable and completed the job to perfection!

GREG

Client

Weverson is an incredibly gifted developer. In addition, he has excellent communication skills. I think what sets him apart are his world class UI/UX skills. Highly enjoyed working with Weverson and hope to work again with him in the future!

JEFF G.

Cleeri

The communication is so fluid and pleasant, his ideas are worth their weight in gold, his speed of execution is perfect, the fact that he is involved and creates a real bond with the project.

JEFF P.

Brush'n'Shade

Quickly understood our requirements and expertly delivered on them ahead of schedule.

LOUIS

TruNarrative

Very talented developer who communicates well, is reliable, and thinks entrepreneurially which means he'll present ideas and offer suggestions on how to improve existing ideas.

CAMERON W.

WeNomad

Absolute pleasure to work with. Very clear and knowledgeable and completed the job to perfection!

GREG

Client

About

Product engineer. Design background. Founder instincts.

I'm a senior product engineer with 15+ years building web products, working AI-native. I own product, design, and engineering end-to-end, working with founders and teams to ship SaaS and fintech applications from idea to production. With a design background, I ship user experience that moves business outcomes: conversion, retention, revenue.

I like to get close to the problem. Not just what we're building, but why, and for whom. I bring ideas throughout a project, stay close to user feedback, and sometimes the best contribution is helping simplify what's already on the roadmap. Some of the features I've proposed became the most-used parts of the platform.

I've built agentic pipelines in production, put LLMs at the core of new features, and use Claude Code and Codex daily. I've integrated LLMs into live applications, built RAG pipelines, and shipped agentic workflows that handle ideation, writing, review, image generation, and publishing end-to-end. The point isn't using AI. It's what gets shipped because of it.

I founded and scaled my own e-commerce business to $5M+ in revenue serving 10,000+ daily users at peak. Over the last seven years I've worked with US and international startups on long-term engagements, shipping investor dashboards, AI survey analytics, financial planning SaaS, AI content platforms, crypto trading platforms, and marketplaces.

Based in Madrid, Spain, with good overlap with US time zones.

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