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English
$
USD
I will be your full stack developer for react, nextjs, nodejs and nestjs
Kai k.
Level 1
5.0
5.0
About this gig
9+ Years | Top 1% Fiverr | 210+ Websites Enterprise & YC Clients | 100% Satisfaction | Certified Expert
Need someone whos actually shipped SaaS products not just learned the stack?
Most projects dont fail because of bad ideas. They fail because the system isnt designed properly from the start.
I'm Kai, a full-stack developer with 9+ years of building real SaaS products and business systems not demos, not half-finished apps. I work on dashboards, admin panels, APIs, and full SaaS platforms that need structure, clarity, and long-term stability.
Most clients come to me after something went wrong. I help fix that by keeping things simple, clean, and well-planned.
What I work on
- Custom web applications
- SaaS platforms & internal tools
- Backend APIs & integrations
- Authentication, roles & permissions
- Database design & data structure
Tools I use
Frontend Development
- React.js, Next.js, Vue.js, TypeScript
- Tailwind CSS, Bootstrap, MUI, Ant Design
- GSAP, Three.js, WebGL
Backend Development
- Node.js, Express.js, Nest.js
- GraphQL, REST APIs, WebSockets
- JWT, OAuth
Message me before ordering.
I'll tell you whats worth building, what to avoid, and how to do it right the first time.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Kai k.
Kai k.
Senior Software Engineer
Level 1
- FromUnited Kingdom
- Member sinceSep 2025
- Avg. response time1 hour
- Last delivery1 month
Languages
English, German, French, Spanish, Arabic
Senior Full Stack Developer | React | Node.Js | Supabase | AI SAAS | AI agents | AI Chatbots
Hi! I’m a Sr. Full Stack Developer with 9+ years of experience delivering scalable, MVPs and enterprise-level web applications for clients globally.
What I Offer
✅ Custom Web Applications (React, Next.js, Node.js)
✅ Enterprise SaaS Development (multi-tenant, scalable systems)
✅ API Development & Integrations (REST, Webhooks, CRMs)
✅ Admin Dashboards & CMS Solutions
✅ Industry Solutions: Real Estate, Education, Retail & eCommerce, Logistics, Energy, Aviation, Healthcare
Let's Start - Order Now
My Portfolio
FAQ
Why should I message you before ordering?
A short discussion upfront helps avoid bad decisions and ensures we build the right thing the right way from the start.
What type of projects do you work on?
I work on real production projects SaaS platforms, dashboards, admin panels, APIs, and internal business systems. Not demos, tutorials, or half-finished apps.
Do you build full SaaS products or only parts?
Both. I can build a full SaaS system from scratch or work on specific parts like backend APIs, dashboards, authentication, or database design.
Can you fix or continue an existing project?
Yes. Many clients come to me with slow, messy, or unfinished codebases. I can refactor, stabilize, and extend existing systems without breaking them.
How do you approach a new project?
I start by understanding how the system should work, how it will grow, and where problems could appear later. Then I design the structure before writing code.
Which technologies do you use?
React, Next.js, Node.js, Express, NestJS, MongoDB, PostgreSQL, MySQL, plus standard web technologies like HTML, CSS, and JavaScript.
Do you care about performance and scalability?
Yes. Performance, structure, and scalability are part of the build, not afterthoughts.
Will you communicate during the project?
Absolutely. You’ll always know what’s happening, what’s next, and why. No guessing, no disappearing.
Reviews
9 reviews for this Gig
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| (0) | ||
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
T tommy_johnn2
United Kingdom
Very solid developer. Took ownership and handled everything properly. 10/10 Recommended
Up to $50
Price
2 days
Duration
Helpful?T thomson_210
United States
Delivered exactly what was needed. Easy to work with.
Up to $50
Price
4 days
Duration
Helpful?S sammy_243
United States
Handled deployment issues smoothly, especially environment variable setup. Everything is working now. Easy to work with and very responsive.
Up to $50
Price
3 days
Duration
Helpful?L leborn_
United States
Simple, effective, and professional.
Up to $50
Price
2 days
Duration
Helpful?B bet231
United States
Quick turnaround and solid front-end fix.
Up to $50
Price
3 days
Duration
Helpful?
Reviews
9 reviews for this Gig
| (9) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
T tommy_johnn2
United Kingdom
Very solid developer. Took ownership and handled everything properly. 10/10 Recommended
Up to $50
Price
2 days
Duration
Helpful?T thomson_210
United States
Delivered exactly what was needed. Easy to work with.
Up to $50
Price
4 days
Duration
Helpful?S sammy_243
United States
Handled deployment issues smoothly, especially environment variable setup. Everything is working now. Easy to work with and very responsive.
Up to $50
Price
3 days
Duration
Helpful?L leborn_
United States
Simple, effective, and professional.
Up to $50
Price
2 days
Duration
Helpful?B bet231
United States
Quick turnaround and solid front-end fix.
Up to $50
Price
3 days
Duration
Helpful?
