I |
digital experiences

Frontend Developer specializing in React, TypeScript, and exploring the possibilities of AI tools and integrations.

About Me

There's something satisfying about those small wins, you know, when you finally fix that one thing that's been nagging at you for days. I love building things with React and TypeScript, and I'm currently obsessing over AI possibilities in real-world projects

I don't pretend to have everything figured out, but I genuinely love learning something new every day and getting better at what I do. I'm exploring full-stack development because I'm curious about how everything works together, and I love working with teams using modern workflows to build things that actually matter.

When I'm not coding, you'll find me smashing balls around a padel court, getting lost in concerts, or spilling coffee on my table more often than I'd like to admit.

Dennis Mainhardt - Frontend Developer

Nice to meet you 👋 — I'm Dennis.

34Coffee CupsSpilled
127"Aha!"Moments
"One More Game"Sessions
6Concertsplanned

Technical Expertise

Building things with React and TypeScript that people actually want to use, plus experimenting with AI to make them even better.

Frontend Mastery

Modern Web Development

Focus Areas

React Components
State Management
UI/UX
Responsive Design

Core Technologies

React
TypeScript
JavaScript
Next.js
HTML/CSS

AI Integration

AI Experimentation & Integration

Focus Areas

LLM Integration
Prompt Engineering
AI-Powered Features
Context Management

Core Technologies

OpenAI API
Anthropic Claude API
Prompt Engineering
Generative AI

Full-Stack Vision

Expanding Development Skills

Focus Areas

API Development
Database Integration
Authentication
Backend Logic

Core Technologies

Firebase/Firestore
REST APIs
GraphQL
Node.js

Professional Workflow

Modern Development Practices

Focus Areas

Code Review
Version Control
Testing Practices
Team Collaboration

Core Technologies

Git
CI/CD
Jest/Cypress
Agile/Scrum
Jira

Professional Experience

My journey in Front-End Development

Software Engineer

Remote, Germany
Sep. 2025 - Today
Full-time

Developing and maintaining cloud-based web applications for the energy industry using TypeScript across frontend and backend.

Key Achievements:

  • Built frontend applications with React, Next.js, and TypeScript, focusing on performance and usability
  • Implementing backend services and APIs on AWS using TypeScript
  • Collaborating with cross-functional teams to deliver reliable production systems
ReactTypeScriptNext.jsREST APIsAWSMaterial UI

Jr. Front-End Developer

Remote, Germany
Jul. 2022 - Mar. 2025
Full-time

Developed web applications for German government digital transformation projects using React, TypeScript, and Next.js. Focused on accessibility compliance and responsive design in regulated environments.

Key Achievements:

  • Implemented responsive interfaces using React, TypeScript, Next.js, and modern CSS frameworks
  • Contributed to digital transformation initiatives serving German citizens
  • Collaborated with cross-functional teams including designers and government stakeholders
ReactTypeScriptNext.jsREST APIsGraphQL

Apprenticeship: Web Development

Remote, Germany
Oct. 2020 - Jun.2022
Full-time

Started professional development journey specializing in government digital transformation projects. Learned React, TypeScript, and modern web development while working on citizen-facing applications.

Key Achievements:

  • Completed Fachinformatiker Anwendungsentwicklung certification through IHK Düsseldorf
  • Learned React ecosystem and TypeScript
  • Worked on accessibility-compliant web applications following WCAG standards
ReactJavaScriptTypeScriptNext.jsHTMLCSSGraphQLREST APIsCI/CD

Featured Projects

Real projects demonstrating React, TypeScript, and AI implementation

Bestii
Featured

Bestii

AI-powered chat platform that feels like texting your most emotionally intelligent best friend.

ReactTypeScriptFirebaseOpenAIAnthropic ClaudeVite
Portfolio

Portfolio

My modern, responsive portfolio website showcasing my projects, skills and personality.

ReactTypeScriptTailwind CSSShadcn UIFramer MotionVite
Haarstudio Hilden

Haarstudio Hilden

Modern, responsive website for a professional local hair salon located in Germany.

ReactTypeScriptTailwind CSSShadcn UIVite
LCN Beauty Center

LCN Beauty Center

Modern, responsive website for a professional local beauty salon located in Germany.

ReactTypeScriptTailwind CSSShadcn UIVite

Why Me?

Frontend Passion

I actually enjoy making interfaces that feel right to use. When everything clicks and users don't have to think about it

Full-Stack Curiosity

I'm actively exploring backend technologies because understanding the full picture makes me a better developer and teammate.

AI Future Vision

AI is becoming standard in development today, so I'm building real projects and experiences around that

Growth Mindset

I don't pretend to know everything, but I learn fast and embrace feedback. I'd rather admit gaps and figure it out than fake expertise.

Let's Build Something Amazing

Seeking frontend positions using React, TypeScript, and AI. Open to roles with full-stack growth potential.