Mike T.
React & Next.js Frontend Specialist | Scalable Apps & AI Interfaces
Hi, I’m Mike, a Senior Frontend Engineer with 10+ years of experience building scalable, high-performance web applications using React, Next.js, and Angular. I work with SaaS companies, startups, and enterprise teams to turn designs into fast, maintainable, and user-friendly interfaces that scale with real business needs. Core Expertise & Technologies Frontend Development - JavaScript (ES6+), TypeScript, HTML5, CSS3 - React, Next.js, Angular, Gatsby - Component-driven architecture and design systems - Responsive and accessible UI development - Styling & Collaboration - Styled-components, CSS Modules, Tailwind, Bootstrap - Git, GitHub / GitLab, agile team workflows - Code Quality & Performance - I focus on clean, modular, and maintainable code with strong attention to performance, accessibility, and long-term scalability. - Test-Driven Development using Jest, Mocha, and Sinon - End-to-end testing with Selenium and Protractor - Cross-browser and cross-device validation - AI & LLM Integration Experience In addition to frontend development, I have hands-on experience integrating AI and LLM features into production web applications, including: - Chat and support interfaces using OpenAI / GPT APIs - Context-aware UIs for summarization, classification, and content generation - Secure prompt handling, token optimization, and function calling - AI-assisted workflows and internal tooling I focus on practical, secure, and performant AI integrations that improve real user experiences. What I Bring to the Table - Modern, scalable React and Next.js frontends - Pixel-perfect implementation from design specs - Performance and UX improvements - Clear communication and reliable delivery - Frontend development with optional AI integration expertise Clients looking for a senior React or Angular developer, especially with AI integration experience, will find my skill set well suited to modern web applications. Let’s connect and discuss how I can help bring your product to life. Mike Taatgen
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $109k
Billed in all: $1,154,199$1.15M
$18k in the last 6 months
Across 91 contracts
Earnings, last 30 days
Skill rankings: #1 in 5 skills of 15
Rarest: top 0.03% in CSS 3, of 9,914. Ranked by MRR among everyone on Upwork with the skill.
- PSD to HTML2,799 freelancers · 🇺🇸 #1Top 0.04%🇺🇸#1 of 87
- Sass1,305 freelancers · 🇺🇸 #1Top 0.08%🇺🇸#1 of 90
- React Bootstrap688 freelancers · 🇺🇸 #1Top 0.15%🇺🇸#1 of 25
- Jest412 freelancers · 🇺🇸 #1Top 0.24%🇺🇸#1 of 19
- Gatsby.js318 freelancers · 🇺🇸 #1Top 0.31%🇺🇸#1 of 30
- Ionic Framework1,184 freelancers · 🇺🇸 #2Top 0.17%🇺🇸#2 of 55
- CSS 39,914 freelancers · 🇺🇸 #1Top 0.03%🇺🇸#1 of 689
- #4Tailwind CSS6,978 freelancers · 🇺🇸 #3Top 0.06%🇺🇸#3 of 334