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I will build a simple responsive web app with react and nextjs
Jonathan G
About this gig
Turn one clear idea into a working web app. I will build a small responsive application using React, Next.js and TypeScript, such as a calculator, tracker, planner or simple records tool.
I have 4+ years of professional development experience across agency and financial-services teams.
Basic: 1 screen with one agreed calculation or input-to-result flow.
Standard: up to 3 screens with one browser-saved dataset.
Premium: up to 5 screens with one Supabase dataset, email-link sign-in and records restricted to their owner.
All packages include a clean layout based on an agreed reference, mobile and desktop checks, source code, setup notes and one deployment to your compatible hosting account.
One dataset has up to 6 simple fields. Premium has one user role. Hosting and paid services are your costs.
Please send your idea, screen list and acceptance criteria before ordering. Payments, marketplaces, chat, complex permissions, AI features and existing-app rescues need separate scope. English and German communication.
Get to know Jonathan G
Jonathan G
React Nextjs and TypeScript Developer
- FromGermany
- Member sinceAug 2019
Languages
English, German, Chinese, Korean
I'm Jonathan, a German fullstack developer with 4+ years of professional experience in agency and financial-services teams. I build and maintain web applications with React, Next.js and TypeScript. I can help you fix frontend bugs, connect Sanity CMS, migrate JavaScript to TypeScript, or build a document chatbot with source citations. You receive maintainable code, testing notes and a clear handover. I work in German and English and am based in South Korea. Send me your requirements so we can agree on a practical scope.
Other Software Development Services I Offer
FAQ
What kinds of apps fit these packages?
Calculators, small planners, personal trackers and simple record tools fit well. The app must have one agreed workflow and stay within the screen/data limits. A marketplace, social network or full SaaS platform needs a separate scope.
Is Basic a working app or only a design?
It is a working one-screen tool with up to 6 inputs, up to 5 supplied calculation rules and a result view. It includes source code and one deployment. It has no login, saved records, database or external API integration.
What is the difference between browser and cloud storage?
Standard stores one dataset in that browser; clearing storage can erase it and devices do not sync. Premium stores one dataset in your Supabase project, with email-link sign-in and access limited to each user's own records.
Do you create the design and deploy the app?
I create a clean layout from one agreed reference and your supplied content. This is not a separate Figma/branding service. One deployment to a compatible host in your account is included; hosting fees and custom infrastructure are excluded.
Can you work on an existing app or add more features?
These packages assume a new project. Existing repositories, payments, AI features, integrations and complex permissions need review and a separate quote. Please message me before ordering so we can agree a deliverable scope.
What counts as a revision?
One revision is one consolidated feedback round on the agreed scope. Extra screens, integrations or workflows need a new quote. Defects in my delivered changes reported within 7 days of completion are corrected; unrelated changes and third-party outages are excluded.
Do I receive the source code and pay ongoing costs?
Source code and setup instructions are included. Third-party components retain their licenses. You pay hosting, developer memberships, paid assets, automation plans and API usage in your own accounts. Ongoing maintenance is a separate service.
Do you use AI coding tools?
I may use AI tools to assist development and remain responsible for reviewing and testing my delivery. Tell me about restrictions before ordering. We will agree how confidential code and data may be handled before external AI services are used.
How will we communicate?
I communicate in English and German through Fiverr messages. Calls are by appointment through Fiverr where available. Each order includes written setup notes and a handover; please send your requirements before ordering so I can confirm scope.
