Available for projects & opportunities

I fix slow, buggy frontends so your users stay.

Wilson Kinyua — Former CTO at Paya Finance

Senior Frontend Engineer for SaaS and fintech teams. 35% faster load times. 30% higher engagement. Ship with confidence.

35%Faster Load Times
15%Lower Churn
90%Fewer Security Threats

“Wilson delivered a week early, and our conversion rate doubled.”

— Nelson K., Head of Product Weza Prosoft

I leverage AI to ship 2-3x faster without sacrificing code quality.

Open to select freelance projects and senior roles at remote-first companies.

Wilson Kinyua - Professional Software Engineer portrait

Trusted by teams at

Belva Digital
Moringa School
Weza Prosoft
Paya Finance
Brance Technologies

7+

Years Experience

600+

Students Mentored

10,000+

Users Supported

What People Say

Client Testimonials

Wilson transformed our mobile app performance. Load times dropped by 35% and our users finally stopped complaining about crashes. He also brought AI expertise we didn't know we needed—our engagement metrics are up 30% since he integrated personalization features.

OK

Oliver K.

Cheif Operating Officer, Paya Finance

We hired Wilson to rebuild our marketing site before a major launch. He delivered a week early, and the site scores 95+ on Lighthouse. More importantly, our conversion rate doubled. He's now our go-to for any frontend work.

SK

Sarah K.

Founder & CEO

I've worked with many senior engineers, but Wilson stands out. He doesn't just write code—he thinks about the business impact. When he joined our team, bug reports dropped 25% and we shipped features 30% faster.

NK

Nelson K.

Head of Product, Weza Prosoft

Proven Results

Featured Case Studies

Real projects with measurable outcomes. See how I've helped teams improve performance, reduce churn, and ship faster.

CTO
Fintech
Featured

Paya Finance

Chief Technology Officer

Jan 2024 - Jun 2024

The Challenge

Paya's financial platform needed AI-driven personalization to boost engagement and comprehensive security hardening to protect user financial data. The mobile app also suffered from performance issues causing user churn.

What I Did

  • Integrated AI-driven personalization features using machine learning algorithms and data analytics
  • Implemented comprehensive security audits and penetration testing aligned with IT governance standards
  • Led the adoption of Agile project management to optimize the software development lifecycle

Results

30%

Customer Engagement

90%

Security Threats

15%

Customer Churn

30%

System Downtime

25%

App Crashes

25%

Code Quality

Tech Stack

React Native
TypeScript
Nest.js
PostgreSQL
AWS
Digital Ocean
Docker
Git
CI/CD
Martech Agency

Belva Digital

Senior Frontend Developer

Jan 2025 - Present

The Challenge

Client web applications were suffering from slow load times and poor Lighthouse scores, leading to decreased user engagement and lower search rankings.

What I Did

  • Led development of scalable frontend applications using Next.js, Nuxt.js, and TypeScript
  • Collaborated with UI/UX designers to convert Figma wireframes into high-performance interfaces
  • Applied performance monitoring tools to identify and resolve bottlenecks

Results

35%

Page Load Times

25%

Lighthouse Scores

Tech Stack

Next.js
Nuxt.js
TypeScript
Tailwind CSS
Figma
Education

Moringa School

Senior Software Engineer

May 2022 - Sep 2023

The Challenge

The software development curriculum needed modernization to prepare students for real-world engineering challenges. Students lacked practical debugging skills and exposure to modern development practices.

What I Did

  • Designed and conducted hands-on coding workshops for 600+ students
  • Integrated debugging techniques, UI/UX principles, and CI/CD best practices into curriculum
  • Implemented Agile methodologies to optimize project workflows

Results

15%

Student Satisfaction

40%

Practical Skills

50%

Problem-Solving Abilities

20%

Project Timeline

15%

Team Productivity

Tech Stack

React.js
Node.js
Python
Django
Git
CI/CD
Agile
Enterprise Software

Weza Prosoft Limited

Senior Software Engineer

Oct 2020 - Apr 2022

The Challenge

The internal procurement system had poor UX leading to low adoption rates. External client projects required cross-platform solutions that were taking too long to deliver.

What I Did

  • Prioritized features using UI/UX design principles and user feedback
  • Led development of cross-platform Snagging app for Windows, macOS, Android, and iOS
  • Optimized deployment workflows and integrated rigorous testing processes

Results

20%

User Satisfaction

30%

Project Completion Time

40%

Client Satisfaction

30%

Time-to-Market

Tech Stack

React.js
React Native
Node.js
PostgreSQL
Docker

Ready to see these results for your project?

Book a Free Strategy Call

How I Can Help

Productized Services

Clear deliverables, fixed timelines. Choose the engagement that fits your needs.

Most Popular

Frontend Performance Audit

Find out what's slowing you down

For: SaaS/fintech teams with slow, underperforming apps

I'll analyze your web application and identify exactly what's slowing it down and costing you users. You'll get a prioritized roadmap to fix it.

What you get:

  • 30-minute video walkthrough of issues
  • Prioritized fix list with effort estimates
  • Core Web Vitals baseline report
  • Quick wins implementation guide
Timeline: 5 business days

SaaS Marketing Site Build

Launch with a site that converts

For: Startups launching or redesigning their marketing site

A high-converting marketing site built with Next.js, optimized for performance, SEO, and lead capture. Perfect for launches or redesigns.

What you get:

  • Fully responsive Next.js site
  • CMS integration (Sanity or Contentful)
  • Analytics & conversion tracking setup
  • SEO optimization & meta tags
  • 2 rounds of revisions
Timeline: 4 weeks

AI Feature Integration

Add AI that actually works

For: Teams wanting to add AI-powered features to their product

Add AI-powered features to your existing product—smart search, recommendations, chat interfaces, or automation—without disrupting your codebase.

What you get:

  • Working AI feature integrated into your app
  • Documentation & architecture decisions
  • Team handoff session
  • 30 days of bug fix support
Timeline: 2-3 weeks
Wilson Kinyua - Professional software engineer working

About Me

Former CTO, Senior Frontend Engineer

I'm a Senior Frontend Engineer who's shipped products for fintech, SaaS, and education companies over the past 7 years.

Most recently, I served as CTO at Paya Finance, where I integrated AI-driven personalization and reduced security threats by 90%.

I specialize in:

  • High-performance frontend applications (Next.js, Vue, TypeScript)
  • AI feature integration that actually works
  • Turning slow, buggy apps into fast, reliable products

I use AI tools to ship 2-3x faster—not as a gimmick, but as genuine leverage that lets me deliver more value in less time.

Why Senior Engineering Matters

Outcomes I Deliver, Not Just Code

Every engagement focuses on business impact: faster load times, fewer bugs, better user experiences.

Faster Load TimesBetter Conversions

High-performance web applications built with Next.js and Vue.js that load fast and rank higher on search engines.

35% faster
SaaS & marketing sites

Interfaces Users LoveHigher Engagement

Intuitive, accessible UI/UX design that reduces friction and keeps users coming back.

30% more engagement
Product teams

Apps That Don't CrashLower Churn

Reliable mobile and web applications with robust error handling and monitoring built-in.

25% fewer crashes
Fintech & SaaS

Seamless IntegrationsFaster Development

Clean API architecture and third-party integrations that work reliably and scale with your business.

30% less downtime
Enterprise apps

Checkout Flows That ConvertMore Revenue

Payment integrations with Stripe, PayPal, M-Pesa, and more—optimized for trust and conversion.

Secure & fast
E-commerce

Level Up Your TeamBetter Code Quality

Technical mentorship and code reviews that help your team ship better code faster.

600+ trained
Engineering teams

Professional Background

Career History

7+ years building products for fintech, SaaS, and education companies. Interested in working together? Get in touch.

  1. Belva Digital

    Senior Frontend Developer

    Next.js
    Vue.js
    TypeScript
    Tailwind CSS
    1. Led development of scalable frontend applications using Next.js, Vue.js, TypeScript, and Tailwind CSS
      35% faster load times
    2. Collaborated with UI/UX designers to convert Figma wireframes into accessible, high-performance interfaces
    3. Optimized frontend codebase and applied performance monitoring tools
      25% Lighthouse boost
  2. Paya Finance

    CTO

    Chief Technology Officer

    AI/ML
    Security
    Agile
    CI/CD
    Leadership
    1. Integrated AI-driven personalization features using machine learning algorithms and data analytics
      30% engagement increase
    2. Implemented security audits and penetration testing to enhance data protection
      90% fewer security threats
    3. Led Agile adoption to optimize IT operations and improve SDLC
      25% code quality boost
  3. Paya Finance

    Senior Software Engineer

    React Native
    API Integration
    Agile
    1. Utilized user feedback and Agile to iteratively enhance mobile app functionality
      15% churn decrease
    2. Implemented API integration with 5 financial partners, improving system interoperability
      30% less downtime
    3. Collaborated with cross-functional teams to address bugs using root cause analysis
      25% fewer crashes
  4. Moringa School

    Senior Software Engineer

    Mentorship
    Curriculum
    Agile
    600+ Students
    1. Collaborated with cross-functional teams to enhance software development curriculum
      15% student satisfaction increase
    2. Designed and conducted hands-on coding workshops for 600+ students
      40% practical skills boost
    3. Implemented Agile methodologies to optimize project workflows
      20% faster project timelines
  5. Weza Prosoft Limited

    Senior Software Engineer

    Cross-platform
    Enterprise
    React Native
    1. Prioritized features for internal procurement system using UI/UX design principles
      20% user satisfaction increase
    2. Led development of cross-platform Snagging app for Windows, macOS, Android, iOS
      30% faster delivery
    3. Optimized deployment workflows integrating software testing strategies
      30% faster time-to-market
  6. Brance Technologies

    Back End Engineer

    PHP
    Laravel
    TDD
    API Design
    1. Developed scalable PHP/Laravel web application using TDD to support 2,000+ users
      30% engagement increase
    2. Implemented monitoring tools to proactively track system performance
      30% fewer incidents
    3. Designed dynamic inventory management system using API-driven architecture
      20% efficiency improvement
  7. Brance Technologies

    Frontend Engineer

    HTML
    CSS
    Bootstrap
    Responsive Design
    1. Developed responsive designs using HTML, CSS, and Bootstrap
      40% engagement increase
    2. Collaborated with UX designers to create visually appealing interfaces
      15% bounce rate decrease
    3. Utilized automated testing tools to conduct weekly code reviews
      20% speed improvement

Technical Foundation

The Tech Stack I Use

View full tech stack →

Javascript

Javascript

Typescript

Typescript

Python

Python

PHP

PHP

Next Js

Next Js

React

React

React Native

React Native

Angular

Angular

Laravel

Laravel

Figma

Figma

django

Django

Tailwind CSS

Tailwind CSS

Bootstrap

Bootstrap

jQuery

jQuery

Wordpress

Wordpress

HMTL

HMTL

CSS

CSS

Mysql

Mysql

Let's Connect

Work With Me

Whether you need a freelance engineer for your project or you're hiring for your team, I'd love to hear from you.

Ready to Fix Your Frontend?

I work with 2-3 clients at a time on focused engagements. If you're dealing with performance issues, UX problems, or need to ship faster, let's talk.

Open to Opportunities

I'm selectively exploring senior/staff frontend roles at remote-first product companies.

What I'm looking for:

  • Remote-first or Kenya-friendly hours
  • SaaS, fintech, or e-commerce product
  • Technical challenges at scale
  • Team that ships over meetings

Or reach out directly:

Schedule a Chat

Questions & Answers

Frequently Asked Questions

Common questions about my services, availability, and how I work.

Get In Touch

Let's Talk For your Next Project(s)

Discuss a project or just want to say hi? Connect with me via email or through a phone call. Review my case studies, explore my services, or check my professional background.

  • Former CTO at Paya Finance (fintech)
  • Trained 600+ developers at Moringa School
  • Clients see 35% faster load times on average
  • 2-3 week turnaround on most projects