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Fiverr Pro
Nederlands
$
USD
I will be your backend developer for nodejs, nestjs and rest apis
Kai k.
Level 1
5,0
5,0
Over deze dienst
Senior Backend Developer | 9+ Years Experience | 125+ SaaS Projects | 100% Satisfaction | Certified Expert
Most products dont break at launch they break when users start showing up.
If the backend isn't designed for growth, everything slows down, fails, or needs a rewrite.
I build backend systems that stay stable, secure, and easy to extend even after months or years of real usage.
No rewrites. No data chaos. No scaling surprises.
I'm Kai, a backend developer with 9+ years of shipping real SaaS systems APIs, databases, authentication, and integrations used daily by real users.
Why this works
- Built for scale, not quick launches
- Clean backend architecture teams can grow on
- Secure auth & data handling from day one
- Databases structured for long-term growth
- Clear communication, zero guesswork
Tech I build with
- Node.js, Express, NestJS
- JavaScript & TypeScript
- PostgreSQL, MongoDB, MySQL
- Supabase, Firebase
- REST APIs, webhooks, Stripe & external APIs
Message me before ordering.
I'll tell you what to build, what to avoid, and how to keep your backend future-proof.
Respecteer de rechten van derden
Let erop dat het tegen het beleid van Fiverr voor freelancers is om thema's, templates of andere elementen in het geleverde werk op te nemen die inbreuk maken op de rechten van derden of toepasselijke wetten. Lees er meer over in onze Gids voor verantwoorde digitale creatie.
Maak kennis met Kai k.
Kai k.
Senior Software Engineer
Level 1
- Afkomstig uitVerenigd Koninkrijk
- Lid sindssep 2025
- Gem. reactietijdBinnen 7 dagen
- Laatste levering4 maanden
Talen
Engels, Duits, Frans, Spaans, Arabisch
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
Mijn portfolio
Veelgestelde vragen
Why should I message you before ordering?
Because a quick discussion upfront helps avoid bad architecture choices that cost time and money later.
What type of backend projects do you handle?
I work on production SaaS backends APIs, databases, authentication systems, and integrations for apps that need to scale. Not demos or throwaway setups.
Can you fix or improve an existing backend?
Yes. I often refactor, stabilize, and scale live systems without breaking what’s already in use.
Do you build backends from scratch?
Absolutely. I design clean backend architecture from day one, so growth doesn’t require rewrites later.
Which technologies do you use?
Node.js, Express, NestJS, JavaScript/TypeScript, PostgreSQL, MongoDB, MySQL, Supabase, Firebase, REST APIs, webhooks, and Stripe integrations.
Is security and scalability included?
Yes. Security, performance, and scalability are built in, not added later as fixes.
Will this work with my frontend or team?
Yes. I build clear APIs and documentation so frontend teams and other developers can work smoothly.
Do you communicate during the project?
Yes. You’ll always know what’s done, what’s next, and why no guesswork.
Reviews
4 reviews van deze dienst
| (4) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Specificering van de beoordeling
- Communicatieniveau van de freelancer
- Kwaliteit van de levering
- Waarde van de levering
Sorteer op
Meest relevant
B brown1865
Verenigde Staten
Good attention to detail. Identified the validation bug and fixed it properly instead of applying a quick patch. Reliable developer with solid backend knowledge.
Tot maximaal US$ 50
Prijs
4 dagen
Looptijd
Nuttig?L laura_evans25
Verenigde Staten
Very good Programmer, I will work with him in future.
US$ 400-US$ 600
Prijs
1 dag
Looptijd
Nuttig?S stevesmith23212
Verenigde Staten
Found the bug fast and fixed it properly. Smooth experience.
Tot maximaal US$ 50
Prijs
2 dagen
Looptijd
Nuttig?B bet231
Verenigde Staten
Knew exactly what to do and delivered without issues.
Tot maximaal US$ 50
Prijs
1 dag
Looptijd
Nuttig?
Reviews
4 reviews van deze dienst
| (4) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Specificering van de beoordeling
- Communicatieniveau van de freelancer
- Kwaliteit van de levering
- Waarde van de levering
Sorteer op
Meest relevant
B brown1865
Verenigde Staten
Good attention to detail. Identified the validation bug and fixed it properly instead of applying a quick patch. Reliable developer with solid backend knowledge.
Tot maximaal US$ 50
Prijs
4 dagen
Looptijd
Nuttig?L laura_evans25
Verenigde Staten
Very good Programmer, I will work with him in future.
US$ 400-US$ 600
Prijs
1 dag
Looptijd
Nuttig?S stevesmith23212
Verenigde Staten
Found the bug fast and fixed it properly. Smooth experience.
Tot maximaal US$ 50
Prijs
2 dagen
Looptijd
Nuttig?B bet231
Verenigde Staten
Knew exactly what to do and delivered without issues.
Tot maximaal US$ 50
Prijs
1 dag
Looptijd
Nuttig?
