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Fiverr Pro
English
$
USD
I will build custom apis and integrations
Juular
About this gig
Need a custom API or help connecting your existing systems?
I build REST APIs, backend services, webhooks, and third-party integrations for web applications and business tools.
What I can help with:
- Custom REST endpoints and webhooks
- Third-party API integrations
- Authentication, validation, and error handling
- Database connections and backend logic
- Extending and troubleshooting existing APIs
Choose your package:
- API Starter ($190): One REST endpoint or webhook handler for an existing application.
- API Integration ($590): One external API integration with authentication, data mapping, and error handling.
- Backend Service ($1,490): Up to 5 endpoints, database integration, one external API connection, and basic authentication.
I work with TypeScript, Node.js, NestJS, Express, PostgreSQL, and Go.
You'll receive maintainable source code, clear communication, and the agreed deliverables.
Please message me before ordering to confirm your requirements and project scope.
Complex integrations may require a custom offer. Hosting, paid API services, deployment, and ongoing maintenance are not included unless agreed separately.
Get to know Juular
Juular
Full Stack Developer
- FromFinland
- Member sinceOct 2026
- Avg. response time1 hour
Languages
Finnish, English
I'm a full-stack developer specializing in modern web applications, API integrations, and backend development.
I work primarily with React, Next.js, TypeScript, and Node.js. My experience includes team-based web development and independent projects involving secure file sharing, analytics dashboards, and service monitoring.
I can help with bug fixes, new features, API integrations, databases, and automation.
I value clear communication, practical solutions, and maintainable code. My approach is simple: understand the problem, build what is needed, and avoid unnecessary complexity.
My Portfolio
Other Software Development Services I Offer
FAQ
Can you work with my existing application or codebase?
Yes! I can add API endpoints, integrate external services, or extend existing backend functionality. I work primarily with Node.js, TypeScript, Next.js, NestJS, and Express. I'll need to review your existing setup before confirming compatibility and scope.
What's the difference between the three packages?
Basic covers one simple endpoint or webhook in an existing application. Standard covers one defined third-party API integration. Premium includes a small backend service with up to 5 endpoints, one database integration, one external API connection, and basic authentication.
Can you integrate any third-party API?
I can work with many documented REST APIs, including payment, AI, communication, and business services. However, integration complexity varies. Some APIs require special permissions, paid access, or additional development. Please contact me to confirm compatibility before ordering.
Do you include database integration and authentication?
Premium includes one database integration and a defined basic authentication solution. Standard and Basic do not include database integration by default, but it can be added separately where appropriate. Advanced authentication, complex user roles, and multi-tenant systems require a custom offer.
Are testing, deployment, and hosting included?
I test the functionality I deliver. Extended automated API test coverage and deployment are available as extras. Hosting, domains, paid API access, and third-party subscriptions are not included in the package price. Ongoing maintenance is arranged separately.
Will I receive the source code and documentation?
Yes. All packages include the custom source code developed for your project. Premium also includes detailed code comments. Additional documentation or setup instructions can be discussed before ordering. Third-party libraries and services remain subject to their respective licenses.
What if my project needs more endpoints or complex features?
Each package has a defined scope. Additional endpoints, complex API integrations, advanced authentication, or requirements beyond the selected package may require a custom offer with adjusted pricing and delivery time. Please message me before ordering if you're unsure which package fits your projec
