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Fiverr Pro
English
$
USD
I will be backend and api developer nodejs javascript
Kunal C.H Das
About this gig
Are you looking for a skilled backend developer to build robust, secure, and scalable APIs for your web or mobile app? Youre in the right place!
I specialize in developing RESTful API endpoints using Node.js and Express.js, with a strong focus on performance, data protection, and production-grade best practices.
What I Offer:
- Custom Express.js REST API development
- Secure database programming (PostgreSQL, MongoDB, MySQL)
- Authentication & Authorization (JWT, OAuth 2.0)
- API integrations & third-party services
- Docker-based deployment for consistency and scalability
- Clean, modular, and maintainable code
Security You Can Trust:
I follow industry-standard security practices including input validation, rate limiting, HTTPS enforcement, and data encryption to protect your app and user data. My implementations align with OWASP Top 10 guidelines to minimize vulnerabilities.
Why Choose Me:
- 3+ years of experience in backend development
- Security-focused, well-documented code
- Timely delivery and open communication
- Full deployment support with Docker
Lets build a backend thats stable, secure, and ready for scale.
Message me now to get started!
Get to know Kunal C.H Das
Kunal C.H Das
Tech enthusiast with experience of 3 years plus
- FromIndia
- Member sinceDec 2024
- Avg. response time1 hour
Languages
Bengali, English, Hindi
I help business owners and overwhelmed developers turn their ideas into beautifully crafted, high-performing websites.
With a sharp eye for design and a deep understanding of user experience, I build custom websites that don’t just look great — they convert, engage, and grow with your business. Whether you need a fresh online presence or development support you can rely on, I deliver tailored solutions and responsive collaboration that make your digital goals a reality.
Let’s build a website that works hard for you — visually, technically, and strategically.
My Portfolio
FAQ
What if i found any bug in the file ?
If you find any bugs after order completion, I offer up to 5 free bug fixes to ensure your satisfaction and a seamless experience.
Can you secure my API and protect user data?
Absolutely. I implement JWT-based authentication, role-based authorization, rate limiting, input sanitization, and follow OWASP Top 10 security guidelines to ensure your API is protected from common vulnerabilities.
Do you offer deployment support?
Yes! I provide Dockerized deployment with production-ready configurations. I can assist with setting up your server (e.g., VPS, cloud provider) and deploying your backend API securely.
Can you integrate third-party services or APIs?
Yes. I have experience integrating payment gateways, email services, SMS providers, and other external APIs into backend systems.
Will you provide documentation for the API?
Of course. I provide clean and clear API documentation using tools like Swagger/OpenAPI or custom API reference guides, making it easy for frontend teams to integrate.
What if I already have an existing backend?
I can work with your existing codebase to extend, refactor, or optimize your API for better performance and maintainability.
Do you sign NDAs or handle sensitive projects?
Yes. I respect confidentiality and am open to signing Non-Disclosure Agreements (NDAs) for projects involving sensitive data or proprietary logic.
Can you build RESTful APIs with custom features?
Absolutely! I specialize in creating tailored RESTful APIs to fit your exact business logic and workflow needs. Whether it’s custom filtering, sorting, pagination, file uploads, background jobs, or webhooks, I can implement features beyond basic CRUD. Just share your requirements, and I’ll build a s
