Available for projects

Hi, I'm Preston Mayieka

I ship AI-powered SaaS products and automate workflows
3 production apps • 1,500+ users • Built in 3 years

Real-world Results

Featured Projects

Explore impactful projects that delivered real-world value.

Nexus AI - AI Document Intelligence Platform

Solo Project 2025

Nexus AI - AI Document Intelligence Platform


  • 500+ documents processed with <2s average query response time
  • Reduced document search time by 75% using RAG architecture
  • Integrated Paystack subscription billing processing recurring payments
  • Built with Next.js, LangChain, Pinecone, and Groq for 60% cost optimization
Ajira365 - AI Career Prep Platform

Personal Project 2025

Ajira365 - AI Career Prep Platform


  • 1,000+ mock interviews conducted with AI-powered feedback system
  • Global leaderboard tracking 300+ active users across 15 countries
  • Built full-stack platform with Next.js, TypeScript, and PostgreSQL
  • Integrated real-time interview simulation with adaptive AI responses
FlowLens - VS Code Context Manager

Solo Project 2025

FlowLens - VS Code Context Manager


  • 94+ active installations with 4.8★ rating on VS Code Marketplace
  • Saves developers 30+ minutes daily by restoring full coding context in <500ms
  • Zero-telemetry, privacy-first architecture with 100% local storage
  • Handles 50+ file workspaces with custom state serialization

User Testimonials

Real Impact, Real Feedback

From users, collaborators, and industry leaders

Emmanuel Shikuku's avatar
Emmanuel Shikuku
CEO @ Calatech

Whether he's diving into frontend frameworks or backend technologies, Preston's ability to innovate and adapt is remarkable. His technical depth consistently exceeds expectations.

FlowLens User's avatar
FlowLens User
Senior Developer

This extension saved me hours of context-switching pain. Finally, a tool that understands how developers actually work. The privacy-first approach is exactly what I needed.

Nexus AI User's avatar
Nexus AI User
Content Manager

Nexus AI transformed how our team searches through documentation. What used to take 15 minutes now takes seconds. The AI responses are impressively accurate.

Emmanuel Shikuku's avatar
Emmanuel Shikuku
CEO @ Calatech

Whether he's diving into frontend frameworks or backend technologies, Preston's ability to innovate and adapt is remarkable. His technical depth consistently exceeds expectations.

FlowLens User's avatar
FlowLens User
Senior Developer

This extension saved me hours of context-switching pain. Finally, a tool that understands how developers actually work. The privacy-first approach is exactly what I needed.

Nexus AI User's avatar
Nexus AI User
Content Manager

Nexus AI transformed how our team searches through documentation. What used to take 15 minutes now takes seconds. The AI responses are impressively accurate.

About Me

I Build Tools That Save Time & Money

Shipping products that cut costs and boost productivity

1,000+
Hours Saved
$50K+
Cost Reduction
3
Production Apps

Saving Time, Cutting Costs

Built 3 apps that help users work faster and spend less. Real tools solving expensive problems.

75%Search Time Reduced
30minSaved Daily per Dev
60%Cost Optimization

Automation That Pays Off

Systems that eliminate manual work, reduce costs, and free up your team to do high-value work.

AI Pipelines

Zero manual processing costs

CI/CD Workflows

Ship faster, reduce overhead

Technical Stack

Next.js
TypeScript
PostgreSQL
Prisma
Node.js
AI/LangChain

The tools are just tools. What matters is shipping something that solves real problems.

Writing & Teaching

Sharing practical strategies on reducing costs, scaling efficiently, and building profitable products.

FreeCodeCamp
Technical Articles
Hashnode
Real-World Insights

Latest Articles

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Feel free to reach out

Contact Me

Let's connect!

prestonnyamweya@gmail.com
+254 799 078 848