--- title: "Fix your v0 app: senior Next.js engineers for v0 projects" description: "Senior engineers turn v0 projects into production Next.js apps: real auth, safe API routes, database access and tests. Fixed price. Starts at $6,000." url: https://zeroic.in/fix-v0-app --- [contra](https://contra.com/ZeroicAgency/reviews) [Clutch](https://clutch.co/profile/zeroic#reviews) [LinkedIn](https://www.linkedin.com/services/page/4a8a1330a86885374b/?viewAsBuyer=true) # Turn your v0 project into a production Next.js app. [Talk to us about your v0 app](https://zeroic.in/book?service=code-rescue) [See the work](https://zeroic.in/work) **Starting at** $6,000 **Timeline** 2-4 weeks **Products shipped** 40+ ## Where most v0 projects are v0 generates clean Next.js and React screens, and it can wire up a database and API routes too. Production asks more of the parts you can't see: who can call each route, which secrets reach the browser, and what happens when a request fails. We build those properly behind the screens you've designed. The screens look finished → The same screens, a real backend API routes trust every request → Every route checks the session Secrets marked NEXT_PUBLIC_ → Secrets kept on the server Data access was wired by prompt → Data access designed and tested ## What we fix in v0 projects ### Routes that check who is asking Generated route handlers often trust the request. We add session checks, ownership rules and input validation to every route and server action before real users arrive. ### Secrets on the server In Next.js, any variable starting with NEXT_PUBLIC_ is bundled into the browser. We keep keys on the server and move the calls that need them into route handlers. ### Database access designed, not prompted v0 connects to Supabase, Neon and other databases in a few clicks. We design the schema, access rules and indexes so the data holds up as more people sign up. ### Your design, kept v0 builds on React, Tailwind and shadcn/ui. We keep your components and layouts as they are and do the work underneath, so the product looks the way you approved it. ## How it works 1. 01 ### Review (3 days) We read the code, the database and the deploy setup, and tell you plainly what to keep, what to fix first and what the fix costs. 2. 02 ### Build what is missing Senior engineers add auth, safe routes and a designed data layer behind your screens, keeping the product you approved. 3. 03 ### Harden and hand off Tests, monitoring and docs go in before handover. You own the code and every account, with 6 weeks of support under real load. Starting at $6,000 Fixed scope and fixed price, agreed after the 3-day review. Not sure what is wrong yet? Start with a [Security Audit](https://zeroic.in/services/ai-audit) (from $1,000). Need more hands once it is fixed? See [senior developer retainers](https://zeroic.in/services/senior-developers). [Talk to us about your v0 app](https://zeroic.in/book?service=code-rescue) Shankar Prasad and Sudhanshu Sharma have been with FormulaBot for 3+ years. We started as a simple English-to-SQL formula generator. It's now a 'chat with your data' product serving 1.5M+ users. They built it like it was theirs. David Bressler David Bressler Founder @ FormulaBot ## Work we've shipped Audits · Security + Performance ### [Audits](https://zeroic.in/audits) Security and performance audits of 100+ live apps, Bubble and Supabase included, with ranked fixes. AI · Prompt tools ### [Prompt Genie](https://zeroic.in/prompt-genie) A shared prompt library for teams. We built its React app, Stripe plans and sign-in, and cut bounce 15%. AI · Analytics ### [Better Analyst (formerly FormulaBot)](https://zeroic.in/formulabot) An analytics app used by 1.5M+ people. We built its AI layer as it grew past a million users. Further reading - [Five production failure modes in every Lovable and Bolt MVP](https://zeroic.in/blog/vibe-coded-mvp-production) - [Code Rescue vs a full rewrite: the real math for vibe-coded MVPs](https://zeroic.in/blog/code-rescue-vs-rewrite) - [Supabase row level security not working: six causes and fixes](https://zeroic.in/blog/supabase-row-level-security-not-working) ## How we can help Four ways to work with us - pick what fits, switch when it doesn’t. From $1,000 · 1-2 weeks ### [Audits](https://zeroic.in/services/ai-audit) Find what's broken - or whether AI is worth it - before you build. Learn more From $12,000 · 5-6 weeks ### [MVP Sprint](https://zeroic.in/services/mvp-development) Zero to production in 5-6 weeks. A real product, not a prototype. Learn more From $4,000/mo · Recurring ### [Retainer](https://zeroic.in/services/senior-developers) A senior engineer embedded on your team, month to month. Learn more From $6,000 · 2-4 weeks ### [Code Rescue](https://zeroic.in/services/code-rescue) Vibe-coded app breaking under real users? We rebuild it to hold. Learn more [Compare all services](https://zeroic.in/services) FAQ ## Frequently asked questions How much does it cost to fix a v0 app? Code Rescue starts at $6,000 for a fixed scope, agreed after a 3-day review. You know the full price before any work starts, so the backend behind your screens holds no surprises. Not sure yet? A Security Audit, from $1,000, shows what needs fixing first. Can you add a backend to our v0 frontend? Yes. We build auth, the database, API routes and integrations behind your existing screens, on Next.js, so nothing you designed has to change. Do we have to host on Vercel? No. v0 projects are standard Next.js apps. Vercel is the easy default, and we can deploy wherever suits you. Can we keep designing in v0? Yes. Keep using it for new screens. We set up the repository and tests so new components plug into the real backend without breaking it. Do we own the code afterwards? Yes, 100%. You own the code, database, docs and credentials. No lock-in and no proprietary platform. ## Hear from us within 24 hours. **Prashant and Khushi** Partners @ Zeroic v0 project ready for real users? Tell us what you designed and what it needs to do. We'll tell you what it would take. Rather talk it through? 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