LM

Open to opportunities

Leonel Zacarias Matsinhe

@leonelzacariasmatsin

Senior Full-Stack Engineer building AI-augmented mission-critical SaaS with Node.js and Vue.

What I'm looking for

I’m looking for a team building mission-critical SaaS where I can combine Node.js/Vue 3 with OpenAI-powered RAG, ship faster with AI tooling, and own integrations like M-Pesa and ERP connectivity.

I’m a Senior AI-Augmented Full-Stack Engineer with 14+ years specializing in Node.js and Vue.js 3 for mission-critical SaaS. I bring rare expertise in M-Pesa API integrations, ERP connectivity (PHC/Primavera), and hardware bridging for Android POS using Bluetooth/USB printers.

I ship robust solutions faster using Cursor AI and LLMs (RAG/Prompt Engineering), including RAG-based systems that automated 80% of customer support workflows. I’ve built a water management platform serving 10k+ users with 99.8% uptime, and I’ve led modernization to Node.js/Vue 3 improving performance by 300% and reducing production bugs by 90%.

Experience

Work history, roles, and key accomplishments

FR

Current

Senior Full-Stack Engineer

Current

Freelancer

Jan 2012 - Present (14 years 6 months)

AI-augmented development using Cursor AI and GPT-4 to ship Node.js/Vue 3 microservices faster, including RAG-based automation for customer support workflows. Built a water management platform serving 10k+ users with 99.8% uptime and designed Android POS solutions with thermal printer integration.

Cursor GPT 4 OpenAI API RAG Prompt Engineering Node NestJS REST GraphQL Microservices Vue.Js 3 TypeScript ERP Docker Linux PM2 Thermal Printers Android App Development Database Design

PR

Full-Stack Developer

Previous Roles

Jan 2010 - Jan 2017 (7 years)

Developed online billing systems for Águas de Sena and published the MatiApp on the Google Play Store.

Billing Systems Android App Development

PU

International Admissions Coordinator

Parul University

Jan 2010 - Jan 2017 (7 years)

Served as an International Admissions Coordinator at Parul University.

Education

Degrees, certifications, and relevant coursework

KA

Katembe

High School Diploma, Natural Sciences and Mathematics

Earned a High School Diploma in Natural Sciences and Mathematics at Katembe.

CI

Cisco

CCNA4 Routing Protocols & Concepts; IT Essentials, Networking

Completed Cisco CCNA4 (Routing Protocols & Concepts) and IT Essentials course content.

UD

Udemy

Course, Mobile and Web Development

Completed the Mobile and Web Development course on Udemy.

IM

INP - Small Project Management

Course, Project Management

Completed the Small Project Management course (INP).

Tech stack

Software and tools used professionally

GitHub

GitHub Actions

MySQL

PostgreSQL

MongoDB

Node.js

Next.js

NestJS

Tailwind CSS

Vue.js

PM2

Linux

GraphQL

Firebase

LangChain

OpenAI API

Cursor

Pinia

Android

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