• EdTech
  • Spain
  • 20 Weeks

Building an Interactive German Learning Experience

Levrez Technologies built Lexik a German learning app for Spanish speakers with colour-coded lessons, interactive practice, and smart daily reminders.
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The Challenge

Client Overview

Lexik is a Spain-based EdTech startup that reimagines how people learn German through a unique colour-coded visual grammar methodology. Instead of relying on complex rules and memorisation, the platform helps learners understand sentence structure intuitively using colours and interactive exercises. Levrez Technologies partnered with Lexik to build the complete technology ecosystem, including the learner-facing mobile app, content management system, challenge engine, and admin analytics dashboard, transforming its innovative teaching approach into a scalable digital learning platform.

Key Pain Points

  • ▲Traditional German grammar learning relied on dense, abstract rule sets that learners could memories but struggled to apply, making it difficult to construct sentences confidently even after extensive study.
  • ▲No existing language app offered a visual, colour-coded approach to grammar, with most platforms focusing on vocabulary while overlooking the structural challenges that make German particularly difficult for Spanish speakers.
  • ▲The platform required a flexible content management system capable of handling thousands of exercises across multiple grammar topics, proficiency levels, and interactive challenge formats without the limitations of off-the-shelf solutions.
  • ▲Maintaining learner engagement and building daily learning habits required intelligent reminders and interactive experiences that encouraged consistent practice beyond scheduled lessons.
  • ▲Supporting a freemium-to-premium business model demanded a custom subscription system with membership controls, renewal management, and revenue tracking integrated seamlessly into the platform.
  • ▲The client needed real-time analytics to monitor lesson performance, user engagement, completion rates, geographic distribution, and content popularity, enabling continuous improvement through data-driven decisions.
Solution visual

Colour-Coded Visual Grammar System & Structured Lesson Architecture

We built Lexik around its unique colour-coded learning methodology, transforming complex German grammar into an intuitive visual experience. The platform organizes content across proficiency levels from A1 to B2, with every grammar topic divided into structured sub-themes and mapped to a consistent colour framework that helps learners instantly recognize grammatical relationships. To support continuous content expansion, we developed a powerful content management system that enables the Lexik team to create, edit, duplicate, publish, or disable lessons and grammar modules independently eliminating developer dependency while ensuring the platform remains scalable and easy to maintain.

Solution visual

Five-Format Interactive Challenge Engine

We developed a powerful challenge engine featuring five interactive exercise formats designed to make German learning engaging and effective. The platform includes notification-based challenges, sentence-writing exercises, drag-and-drop word ordering, colour-coded grammar activities, and multiple-choice questions each reinforcing a different aspect of language acquisition. Powered by a library of more than 13,000 interactive challenges, the system delivers varied, adaptive practice that keeps learners engaged while minimizing repetition and strengthening long-term grammar retention.

Solution visual

Smart Daily Notification System

We engineered an intelligent notification system that seamlessly integrates German learning into users' daily routines. Instead of sending generic reminders, the platform delivers short, contextual grammar challenges based on each learner's proficiency level and recent progress. By encouraging learners to engage with German during everyday moments, the system reinforces consistent practice, strengthens habit formation, and significantly improves long-term learning engagement.

Solution visual

Freemium & Premium Subscription Infrastructure

We built a complete subscription management system supporting both free and premium membership tiers. The platform enables seamless access control, subscription management, renewal tracking, and member administration, while giving the Lexik team full visibility into subscriber activity, conversions, cancellations, and recurring revenue through a centralized management dashboard.

Solution visual

Admin Analytics Dashboard & Content Insights

We developed a comprehensive analytics dashboard that provides real-time insights into platform performance and learner engagement. The dashboard tracks user growth, subscription trends, lesson completion rates, content popularity, geographic distribution, support activity, and overall platform usage empowering the Lexik team to make data-driven decisions, optimize learning content, and continuously improve the user experience.

Key Features

Platform Features & Capabilities

Every feature of Lexik was engineered to transform its innovative visual learning methodology into a scalable, engaging, and data-driven language learning platform. From interactive grammar lessons and intelligent practice tools to subscription management and analytics, Levrez Technologies built a complete ecosystem that supports both learners and administrators.

Colour-Coded Visual Grammar System

A unique visual learning framework that simplifies German grammar by assigning colours to grammatical elements, helping learners understand sentence structure naturally instead of memorizing complex rules.

Structured A1–B2 Learning Path

A comprehensive German curriculum organised across A1 to B2 proficiency levels, with structured lessons and grammar modules that can be easily managed through a powerful content management system.

Five Interactive Challenge Formats

An engaging practice engine featuring sentence building, drag-and-drop activities, colour-based grammar exercises, multiple-choice questions, and contextual challenges powered by a library of over 13,000 exercises.

Smart Daily Notifications

Intelligent, personalized notifications that deliver bite-sized grammar challenges throughout the day, encouraging consistent practice and strengthening long-term learning habits.

Freemium & Premium Subscription Management

A complete membership infrastructure with secure access control, subscription management, renewals, member administration, and revenue tracking for seamless monetization.

Real-Time Analytics Dashboard

A centralized dashboard providing live insights into learner engagement, lesson performance, subscription growth, geographic distribution, and platform activity to support informed business and content decisions.
Technology Stack

Built with Modern Tech

We leverage cutting-edge technologies to build scalable, secure, and high-performance applications that grow with your business.

ReactJS
ReactJS
Node.js
Node.js
Next.js
Next.js
TypeScript
TypeScript
Tailwind CSS
Tailwind CSS
AWS
AWS
AWS RDS
AWS RDS
AWS S3
AWS S3
Figma
Figma
Docker
Docker
Our Process

Project Delivery Approach

A proven methodology that ensures quality delivery, on time and on budget.

Product Discovery & Learning Architecture

Collaborated closely with the Lexik team to define the product vision, validate the colour-coded learning methodology, map the complete A1–B2 curriculum, and document learner and admin workflows. This discovery phase established a scalable foundation that aligned every product decision with educational outcomes.

UX/UI Design & Learning Experience

Designed an intuitive mobile experience and a powerful admin dashboard in Figma, transforming the visual grammar methodology into a seamless digital learning journey. Every interface was optimized to improve lesson completion, reduce cognitive load, and create a consistent user experience.

Scalable Challenge Engine & Content Platform

Developed a modular learning engine supporting five interactive challenge formats and a flexible content management system. The architecture enables the Lexik team to independently manage thousands of lessons and over 13,000 challenges, accelerating content delivery without ongoing development effort.

Intelligent Engagement & Retention System

Engineered a smart notification platform with personalized challenge delivery based on learner progress and activity. Designed to encourage daily practice, the system strengthens user retention, increases learning consistency, and supports long-term habit formation.

Subscription & Business Intelligence Platform

Built a secure freemium-to-premium subscription infrastructure with automated membership management, renewal tracking, and integrated analytics. Combined with a real-time admin dashboard, the platform provides actionable insights into user growth, engagement, content performance, and subscription metrics, enabling data-driven product and business decisions.