I will fix and improve your react, nextjs and supabase app

E
erkinduran958
E
erkinduran958
Erkin Duran
fix and improve your react, nextjs and supabase app
Full Screen
fix and improve your react, nextjs and supabase app

About this gig

Built your app with Lovable, Bolt, Cursor or another AI tool and now it breaks? I fix React, Next.js and Supabase apps so they work reliably in production.


Common problems I solve:

- Login and signup issues, missing profiles, auth triggers

- Row Level Security (RLS) errors, users seeing the wrong data or nothing at all

- Slow pages: select *, N+1 queries, missing indexes, high egress

- Data not syncing between pages or users, realtime and state bugs

- Infinite loading spinners, unhandled errors, re-render loops

- Storage uploads, image handling, Vercel deployment and env issues


How I work: I review your code and database first and send a short written diagnosis. I fix on a separate branch and test before anything touches production. You get clear notes on every change.


Why me: 27+ years in software. I work with React, Next.js and Supabase every day, and I use AI coding tools myself, so I know where they cut corners.


Message me with a short description of the problem before ordering.

  • Type

    • Bug fixes
    • Authentication
    • Database integration
    • Performance optimization
    • Security implementation

  • Vibe coding platform

    • Lovable

  • Target device

    • Website
    • Progressive web app (PWA)
    • Cross-platform app (Mobile, Desktop, Web)

  • Database type

    • Supabase
    • Firebase (Firestore / Realtime DB)
    • AWS (DynamoDB, Aurora, RDS)
    • MongoDB Atlas
    • Google Cloud Firestore / Cloud SQL
    • Microsoft Azure Cosmos DB / SQL Database
    • PostgreSQL

Get to know Erkin Duran

Erkin Duran

Senior Full Stack Developer, Payments Booking

  • FromTurkey
  • Member sinceMar 2021
  • Avg. response time1 hour

  • Languages

    English, Turkish
🏅 27+ years in software, building for clients since 1998 💳 Payment integrations with Stripe (webhooks, idempotency, manual capture), iyzico, PayTR and bank virtual POS 🗓️ Led 11 B2B and B2C booking platforms, including Bokun API integration 🪙 Built the first version of a crypto exchange on my own, from order matching to the balance ledger ⚛️ React, Next.js, Supabase, Laravel, Node.js and Shopify I agree the scope in writing, write tests and keep you updated until the job is done. Based in Istanbul, Türkiye (UTC+3).

My Portfolio

Related tags