Wenilson Marinho

EdTech Product Developer & Multilingual Learning Specialist

Full-stack learning platforms, interactive lessons, placement tests, and AI-supported content workflows.

I turn static lessons into interactive web products for tutors, schools, and language creators. My work is grounded in real teaching experience and covers lesson systems, placement tests, dashboards, quizzes, and multilingual content workflows.

Build a learning toolView selected work

Kraków, Poland · EU-based · Available for remote freelance and contract work

Wenilson Marinho

Profile

Development, teaching, languages, and delivery in one workflow

OiTutor grew from a recurring classroom problem: a live lesson can be useful, but students still need a clear way to review corrections, complete focused practice, and see their progress afterward.

Most language-learning products need more than a developer who can assemble screens. They need someone who understands how learners get stuck, how multilingual content should be reviewed, how AI language output should be evaluated, and how to turn that into a working product.

My mix of more than ten years of language teaching, software development, multilingual experience, and full-stack delivery lets me build tools that are practical for learners and realistic to maintain.

  • 6Languages
  • 10+Years' experience
  • 28+Certifications

Services

What I can build for you

I combine frontend development, language pedagogy, translation and localization, interpretation, and AI language evaluation into one practical niche: interactive learning products.

Interactive Lesson Systems

Modern web-based lessons with answer checking, drag-and-drop tasks, matching, quizzes, feedback, and responsive layouts.

Placement Tests and Quizzes

Self-grading tests with timers, scoring logic, CEFR bands, answer feedback, and study-plan output.

Learning Platform MVPs

SaaS-style education products with lesson routes, dashboards, progress tracking, payments, and content systems.

AI Content Workflows

Prompt systems, JSON lesson templates, automated lesson generation, multilingual review, and localization workflows.

Selected projects

Educational tools, language systems, and practical web products

Learning platform

OiTutor Nihongo

A Japanese learning product with structured beginner progression, interactive exercises, skill-tree navigation, authenticated progress sync, and a student dashboard.

React · Vite · Supabase · Express · Stripe · Nginx · PM2 · JSON lesson architecture

Visit OiTutor NihongoView code
Language learning

LearnWithLyrics

A song-based language-learning project that turns lyrics into focused vocabulary, listening, and comprehension practice.

Visit LearnWithLyrics
Tutoring platform

OiTutor Website

A responsive tutoring platform with lesson samples, pricing, interactive revision exercises, booking integration, embedded video, and Netlify deployment.

HTML5 · CSS3 · JavaScript · Netlify

Visit the homepage
Assessment

English Placement Test

A 90-question English placement test with a countdown timer, automatic scoring, CEFR level output, instant feedback, and study-plan logic.

Node · Express · Scoring logic

Take the test
Lesson tooling

Interactive Lesson Builder

A reusable interactive lesson system that turns lesson content into drag-and-drop exercises, matching tasks, and student-facing revision activities.

HTML5 drag and drop · CSS Grid · Vanilla JavaScript

Private project · Not for sale

Automation

AI Lesson-Prompt Generator

A Python and Bash command-line tool that generates structured AI lesson prompts from JSON templates, reducing lesson-planning time and standardizing output quality.

Python · Bash · JSON · AI workflows

Private project · Not for sale

Web utility

JP to PL Import Calculator

A responsive utility that calculates product landed cost across PLN, USD, and JPY with a clean browser interface.

JavaScript · Responsive UI

Publishing

Medical Glossary

A published reference book with nearly 1,000 medical terms for interpreters and language professionals.

View on Amazon

Case study

OiTutor Nihongo

A production-focused Japanese learning app built around structured beginner progression, reusable lesson architecture, and synced learner progress.

The learning product

OiTutor Nihongo turns a beginner Japanese curriculum into a hosted learning product with lesson routes, reusable exercise types, authenticated progress, XP, achievements, completion screens, and a student dashboard.

The product layer

The implementation includes lazy-loaded JSON lessons, React and Vite routing, Supabase user data, an Express API, Stripe billing, and VPS deployment with Nginx and PM2.

Explore OiTutor Nihongo

Tech stack

Skills shaped around EdTech delivery

Front-End

React, JavaScript, HTML5, CSS3, Tailwind, responsive UI, and interactive exercises.

Backend and Scripting

Node.js, Express, Python, Bash, JSON workflows, and API integration.

EdTech and Learning Systems

Quizzes, CEFR scoring, lesson builders, progress tracking, placement tests, and drag and drop.

AI and Language Workflows

AI language evaluation, prompt workflows, multilingual QA, localization review, AI content validation, and language-data assessment.

Language background

Six-language profile

My language background supports multilingual education tools, localization workflows, language-learning content systems, and AI language evaluation.

Brazilian Portuguese

Native · C2

English

EF SET and Oxford certified · C2

Spanish

Full professional proficiency · C1

Russian

Pushkin Institute certified · B2

Polish

State exam certified · B1

Japanese

Elementary proficiency · A2

Experience

Teaching, technology, evaluation, and language services

Audio and Native Language AI Evaluation Specialist

micro1 · Remote

Sep 2025 – Feb 2026
  • Reviewed multilingual AI audio and language data for quality, fluency, pronunciation, and linguistic accuracy.
  • Supported AI model improvement through native-language judgment and structured feedback.

Freelance Language Tutor — English, Portuguese, Spanish

Self-employed

2017 – Present
  • Delivered lessons to adult learners and designed custom materials, revision exercises, and learning workflows.
  • Used classroom experience to build interactive EdTech projects, placement tests, and lesson tools.

Freelance Python Developer

Self-employed

Jan 2022 – Dec 2024
  • Built Python scripts and command-line tools for automation, content generation, and educational workflows.
  • Created JSON-based prompt systems and small web utilities using JavaScript, Python, and responsive interfaces.

Portuguese OPI/VRI Interpreter

Voyce and GLOBO

May 2022 – Mar 2025

Provided remote Portuguese interpretation in medical and general-service settings with compliance-focused workflows.

Translator and Localization Contributor

Yeehe, Transifex, and freelance projects

2017 – 2024

Worked on game localization, open-source translation, Bitcoin and PIVX materials, and Brazilian Portuguese content adaptation.

English Teacher

Skyeng

Sep 2018 – Feb 2022

Verified credentials

Education and certifications

Language, teaching, IT, Linux, security, blockchain, and healthcare interpretation credentials.

Education

Bachelor's Degree — Law

Unifacisa Centro Universitário · Campina Grande, Brazil · 2012–2017

Language Certifications

  • EF SET English Certificate C2 Proficient — Mar 2025 — Score: 76/100
  • Oxford Online Placement Test C2: Proficient — Mar 2022
  • Oxford Online Placement Test C1: Advanced — Jun 2019 — ID: 4701600
  • Polish State Exam Certificate B1 — Dec 2023
  • Russian Language Certificate B2 — Pushkin State Russian Language Institute — Feb 2017

Teaching, Interpretation, and Healthcare

  • Language Teaching Methodology — Preply — Jun 2025
  • Medical Specialty Series: Obstetrics and Gynecology — Voyce — Oct 2024
  • Medical Specialty Series: Cardiology — Voyce — Sep 2024
  • HIPAA and Fraud, Waste and Abuse — Voyce — Jul 2024
  • PIPEDA and PHIPA — Voyce — Jul 2024
  • Medical Interpreter Orientation and Compliance Training — Feb 2022
  • Medical Interpretation Training — Oct 2021

IT, Security, and Linux

  • SIEM Fundamentals — Google Cloud Security — Apr 2025
  • Linux Networking and Administration (LFS211) — Jun 2024
  • Cybersecurity Essentials (LFC108) — May 2024
  • LPI Security Essentials (020-100) — Sep 2023
  • CompTIA Network+ — Jun 2023
  • Python for Penetration Testing — Jun 2023
  • Hacking Wireless Networks — Theory and Practice — May 2023
  • Endpoint Detection and Response — Apr 2023
  • PCI Compliance — Apr 2023
  • Policy Compliance (IT) — Apr 2023
  • Vulnerability Management Detection and Response — Apr 2023
  • Vulnerability Management Foundation — Apr 2023
  • Introduction to Python and Hacking with Python — Feb 2022
  • Cyber Security Volumes 1–4 — Jan 2021

Blockchain and Web3

  • Cryptography and Privacy Coins — Apr 2020
  • Ethereum Smart Contract Programming 201 — Apr 2020
  • Ethereum Smart Contract Security — Apr 2020
  • Bitcoin Attacks — Mar 2020
  • DeFi 101 — Mar 2020
  • Ethereum Smart Contract Programming 101 — Mar 2020
  • JavaScript Programming for Blockchain Developers — Mar 2020
  • Blockchain and Bitcoin 101 — Feb 2020
  • Ethereum 101 — Feb 2020

Need an interactive lesson, quiz, placement test, or learning-platform MVP?

Tell me what you are building and where learners currently get stuck.

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