Interactive lessons
Responsive exercises with checking, feedback, and reusable content structures.
Teacher and product developer
Wenilson Marinho
I teach languages and build practical learning products: interactive lessons, placement tests, revision systems, dashboards, and structured content workflows.
Teaching informs the product
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.
My work combines more than ten years of language teaching with hands-on web development. That combination keeps the tools focused on real learning decisions rather than feature volume.
What I build
Small, usable systems for tutors, schools, and language-learning teams.
Assessments
Placement tests, timers, scoring rules, CEFR results, and study-plan output.
Student systems
Authenticated dashboards for lessons, homework, vocabulary, progress, and balance.
Content workflows
Structured lesson data, generation tools, localization, and quality checks.
Selected work
OiTutor
A static public learning site connected to a private Supabase-backed student dashboard.
OiTutor Nihongo
A structured Japanese learning application with reusable exercises, learner progress, and hosted product infrastructure.
Assessment and lesson tools
English placement testing, interactive revision architectures, and automated lesson-content workflows.
Languages
English, Portuguese, Spanish, Japanese, Polish, and Russian inform my teaching and localization work.
Working style
Clear scope, direct communication, maintainable delivery, and testing proportionate to the risk of the change.