Available for Work

Kelvin Gevariya

Full-Stack Developer | Node.js + React + Stripe

I build production-ready SaaS applications with React, Next.js, and Stripe.

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Results-Driven Engineering

$50K+Monthly Payments
70%Fewer Breaches
25%More Engagement
40%Faster DB
+28Lighthouse
99.9%Uptime
$50K+Monthly Payments
70%Fewer Breaches
25%More Engagement
40%Faster DB
+28Lighthouse
99.9%Uptime

Building Production-Grade SaaS

From idea to revenue-generating product. I specialize in complete SaaS applications with Stripe-powered payment infrastructure.

From Idea to Revenue

I build complete SaaS applications that turn business ideas into production-ready platforms. From architecting multi-tenant systems to integrating Stripe payment infrastructure, I handle the full stack.

My focus is on reliability (99.9% uptime), performance (50% faster loads), and scalability (500+ businesses onboarded).

$50K+
Monthly Payments
99.9%
Uptime
500+
Businesses
50%
Faster Performance

Stripe & Payments

Billing, Connect, Subscriptions, Marketplace Payouts

$50K+ monthly

Frontend Development

React.js, Next.js, TypeScript, Tailwind, Shadcn UI

+28 Lighthouse

Backend & Database

Node.js, Express.js, MongoDB, PostgreSQL, Prisma

40% faster DB

Performance

SSR/SSG, Code Splitting, Caching, CDN

50% faster loads

Security & Auth

JWT, OAuth 2.0, RBAC, Secure Webhooks

70% safer

SaaS & DevOps

Multi-tenant, Vercel, AWS S3, CI/CD, GitHub Actions

99.9% uptime

Case Studies

Real projects with measurable impact. Click to explore the full story.

Featured

FPMS – Freelancer Project Management SaaS

Multi-tenant SaaS with Stripe Connect payments

Next.jsTypeScriptMongoDBPrisma ORM+3 more
View Case Study
Featured

PReasy – AI for PR and Public Affairs

Public Relations and Public Affairs made easy

React.jsNext.jsTypeScriptGoogle Cloud+2 more
View Case Study

BizDir MVP – Business Directory Platform

Location-based business discovery with Filters

Next.jsTypeScriptNode.jsExpress.js+2 more
View Case Study

How I Build SaaS

A systematic approach to building production-grade SaaS applications.

Step 1

Architecture

Next.js & Microservices
Step 2

Testing

Jest & Cypress CI/CD
Step 3

Performance

Core Web Vitals Optimized
Step 4

Security

OAuth 2.0 & RBAC
Step 5

Deployment

Vercel Edge Network

Experience

Building SaaS products with Stripe payments since 2019.

Full-Stack SaaS Developer

Upwork Freelance (Remote)
Jan 2020 - Present

Specialized in SaaS dashboards, payment flows, and subscription systems for global clients.

  • Delivered multiple full-stack projects from concept to production
  • Built scalable multi-tenant SaaS architectures
  • Maintained 5+ year portfolio with focus on quality and reliability

Junior Software Developer

Zerotime Solutions, Ahmedabad
Jul 2024 - Jul 2025

Built secure authentication systems and integrated Stripe payment infrastructure for production apps.

  • Built JWT-based authentication reducing access times by 45%
  • Configured Stripe Billing processing $50K+ monthly with 99.9% reliability
  • Leveraged Next.js SSR reducing page load times by 50%

Software Developer Intern

Zerotime Solutions, Ahmedabad
Dec 2023 - Jun 2024

Developed React components and RESTful APIs while collaborating in Agile environment.

  • Implemented performance hooks boosting app speed by 35%
  • Formulated RESTful API endpoints enhancing reliability by 40%
  • Conducted code reviews decreasing production defects by 30%

Technical Deep-Dives

Insights from building production SaaS applications.

Featured

How I Built a Multi-Tenant SaaS With Stripe Connect

Deep dive into Stripe Connect for marketplace payments with custom onboarding.

8 min
StripeSaaS
Read
Featured

Optimizing Next.js SSR for +28 Lighthouse Points

Practical techniques for Core Web Vitals and 90+ Lighthouse scores.

6 min
Next.jsPerformance
Read

Building Realtime Apps With Node.js and WebSockets

Connection handling to scaling: production-ready realtime features.

10 min
Node.jsWebSockets
Read

Designing WCAG 2.1 AA Accessible Interfaces

Building inclusive UIs from the ground up.

5 min
AccessibilityReact
Read

Let's Build Together

Ready to launch your next SaaS product? Let's discuss your project.

Get in Touch

I'm available for freelance projects and full-time opportunities. Whether you need a complete SaaS platform or Stripe integration, let's talk.

Email

kelvinpatelwork@gmail.com

Calendly

Book a 30-min call

Location

Available Worldwide

Send a Message

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editor.tsx

# The Future of SaaS

...

```tsx

const App = () => (

  <Hero />

);

```

The Future of SaaS

Code Block