Door categorieën bladeren
Ontdekken
Fiverr Pro
Nederlands
$
USD
I will develop custom web app with ai API integration saas and full stack solutions
Leonardo J
Over deze dienst
Need a custom web app for your business, startup, or SaaS idea? You're in the right place!
I develop responsive, scalable web applications that turn ideas, designs, and existing projects into functional digital products.
What I can help with:
- Custom web app & SaaS MVP development
- Frontend & backend development
- Database & authentication
- API & third party integrations
- AI powered features
- Dashboards & customer portals
- User roles & custom workflows
- Existing app improvements & new features
- Bug fixing & troubleshooting
- Testing, optimization & deployment
Already have an application? I can continue unfinished projects, fix frontend/backend bugs, troubleshoot API or database issues, improve functionality, and modernize your system without unnecessary rebuilding.
Why work with me?
- I focus on building reliable, user ready applications aligned with your business goals not just writing code.
Send me your requirements or existing project and I'll review the scope, recommend the right approach, and help move your application toward completion and launch.
Maak kennis met Leonardo J
Leonardo J
Fullstack WebDeveloper
- Afkomstig uitDuitsland
- Lid sindsjul 2026
- Gem. reactietijd1 uur
Talen
Nederlands, Duits, Engels, Spaans, Hebreeuws, Frans
I am a Fullstack Web Developer based in Berlin with extensive experience in modern web technologies. My expertise includes working with Angular, NestJS, and CSS to build robust applications. I have a professional background as a Full stack Developer at EQS Group and served as a soldier in the Bundeswehr.
Veelgestelde vragen
Can you build a web application from scratch?
Yes. I can develop a custom web application from your idea, requirements, wireframes, or existing designs. Depending on your needs, the project can include frontend, backend, database, authentication, APIs, AI features, dashboards, and custom workflows.
Can you develop SaaS or MVP web applications?
Yes. I can build SaaS products, MVPs, business platforms, customer portals, dashboards, and other web-based applications. The architecture and functionality will be planned around your intended users, features, and business requirements.
Can you work on my existing web application?
Yes. I can continue unfinished projects, add features, redesign or improve functionality, integrate new services, troubleshoot existing code, and fix issues without unnecessarily rebuilding a working application.
Can you fix bugs in my web application?
Yes. I can troubleshoot and fix frontend, backend, API, database, authentication, functionality, and other application issues. Please provide the existing project and explain the problem so I can assess the required work.
Do you provide AI and API integration?
Yes. I can integrate AI services, APIs, REST endpoints, third-party platforms, payment services, automation tools, and other external systems depending on your application's requirements.
Can you build dashboards, portals, and user management systems?
Yes. I can develop admin dashboards, user dashboards, customer portals, management systems, role-based access, authentication, and other business application functionality.
Do you test and deploy web applications?
Yes. I can test core functionality, identify and fix issues, prepare the application for production, configure the required environment, and assist with deployment. Complex infrastructure or hosting requirements may require a custom scope.
What do you need to start my web application?
Please provide your requirements, designs or wireframes if available, preferred features, integrations, reference examples, and any existing code or application access. For an existing project, include the specific problems, improvements, or features you need addressed.
