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Fiverr Pro
English
$
USD
I will be your expert API developer
Nandini K
5.0
5.0
About this gig
Stop losing users to slow loading. I build sub-second latency REST APIs using NodeJS to power your high-performance AI apps and modern MVPs
In 2026, speed is everything. I develop scalable, secure, and lightning-fast server architectures that handle high traffic without bottlenecks.
What I offer:
- Custom API Development: Robust RESTful endpoints from scratch.
- Performance: Optimized queries and reduced response times.
- Modern Tech: Expert NodeJS (Express) and Python (FastAPI).
- Databases: MongoDB, PostgreSQL, or Redis.
- Security: JWT Auth, CORS, and data encryption.
- Documentation: Clean, commented code and Swagger/Postman docs.
Why work with me? I provide production-ready code for startups and established systems alike. Whether building an AI agent backend or fixing a legacy bottleneck, I deliver clean, maintainable solutions.
Tech Stack:
- Languages: Node.js, Python 3.12+
- Frameworks: Express, Next.js
- Storage: MongoDB, Postgres, Redis
- Tools: Docker, Git, Postman
PLEASE MESSAGE ME BEFORE ORDERING so we can discuss the best architecture for your project.
Get to know Nandini K
Nandini K
Senior Software Developer
- FromIndia
- Member sinceDec 2025
- Last delivery2 months
Languages
Hindi, English, French, Spanish
Senior Software Developer
Over the past 4 years, I've worked with startups and established companies to design interfaces that convert. I'm not just pushing pixels—I'm solving real problems for real users.
My process involves talking to users early and often, wireframing solutions, testing prototypes, and building scalable design systems. Everything I design needs to look good AND perform well.
Results I'm Proud Of
Increased conversion rates by 45% on a SaaS signup flow
Improved task completion by 60% through better navigation
Reduced customer support requests by 35% with clearer UI patterns
My Portfolio
FAQ
Do you provide documentation for the APIs?
Yes! Every project includes basic documentation. For Standard and Premium packages, I provide full Swagger (OpenAPI) or Postman collections so your frontend team can integrate the NodeJS or FastAPI backend instantly.
Can you optimize my existing slow API?
Absolutely. I can perform a performance audit of your current REST API to identify bottlenecks, optimize database queries (PostgreSQL/MongoDB), and implement caching to ensure sub-second response times.
Which is better for my project: NodeJS or FastAPI?
It depends on your needs! FastAPI (Python) is incredible for AI-heavy applications and speed, while NodeJS (Express) is excellent for real-time applications and massive ecosystem support. I can help you choose the best architecture during our chat.
Is the code secure and production-ready?
Yes. I implement industry-standard security practices including JWT (JSON Web Tokens) for authentication, CORS configuration, and environment variable protection to ensure your data stays safe.
Reviews
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S studiolinked
United States
best freelancer ever
$50-$100
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Reviews
1 reviews for this Gig
| (1) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
S studiolinked
United States
best freelancer ever
$50-$100
Price
5 days
Duration
Helpful?
