Supabase experts
Supabase requires PostgreSQL mastery: security definitions, foreign key indexes, and connection pooling with PgBouncer/Supavisor.
Verify zero data leaks across multi-tenant workspaces with clean policy definitions.
Identify sequential scans in pg_stat_statements and add compound indexes.
Harden OAuth callbacks, custom claims, and storage bucket security.
In a Supabase application the browser talks to the database directly, so the policies are not one layer of protection among several — they are the only one. A permissive policy is equivalent to publishing the table.
The test is straightforward and worth doing today if nobody has: log in as one ordinary user and attempt to read another user's rows. If anything comes back, the rest of the work waits.
The same handful of mistakes account for most real-world leaks.
Every policy runs on every row touched by every request. A policy that performs a lookup against an unindexed column turns a fast query into a slow one across the entire application, and the symptom is general sluggishness rather than one obviously slow page.
The columns policies filter on need indexes as much as the ones your application filters on — more, because they run more often.
PostgreSQL has a hard limit on simultaneous connections, and serverless applications open them enthusiastically. This produces an error under load that looks like the database being down when it is merely full.
The fix is using the pooled connection endpoint for application traffic and keeping the direct connection for migrations. It is a configuration change, and it is one of the most common causes of a Supabase app failing exactly when it starts succeeding.
Log in as one ordinary user and try to read another user's rows. If anything comes back, the policies are not doing their job. Reading the policy code is not a substitute for that test.
Usually data volume meeting a missing index, and often an index on a column a security policy filters by. Those run on every request, so the slowdown appears everywhere at once rather than on one page.
Khmelnytskyi, Ukraine
Full-Stack Developer — Websites, Apps, Servers, Databases, AI, SEO & QA
Full-stack developer working across the entire stack — websites, apps, servers, databases, AI integrations, SEO, and QA. Languages & Core: writes code in JavaScript, TypeScript, Python, PHP, Go, and Rust. Architects scalable systems for large-scale projects. Frontend & Interfaces: builds websites and web applications with React and Next.js. Crafts responsive interfaces with Tailwind CSS, Radix UI and Shadcn, adds smooth animations with Framer Motion, and interactive charts with Recharts. SEO Audit & On-Page Optimization: semantic keyword research, resolving technical indexing issues, and optimizing page load speeds. Structures page architecture, meta tags, and multi-language support (i18n). Copywriting & Content Strategy: writes technical articles, drafts precise content briefs for writers, and develops content plans. QA & Testing: full-cycle testing for websites, web services, and Android apps — manual QA for UI/UX and business logic, plus automated testing with Jest, Vitest, Playwright and E2E. Backend, Cloud & Databases: complex API integrations of any scale. Builds servers with Node.js (Express, Fastify). Works with PostgreSQL, MySQL and MongoDB, ORMs (Prisma, Drizzle), and cloud infrastructure (Supabase, Firebase, Cloudflare). Browser Extensions & Automation: develops Manifest V3 browser extensions for Chrome, Edge, Firefox and other browsers. Builds web scrapers for complex data extraction using Puppeteer and Playwright. AI & Intelligent Agents: builds custom AI agents and integrates LLMs from OpenAI, Google Gemini, and Anthropic Claude via API, including Claude Code setups. Servers & DevOps: Linux (Ubuntu) and VPS administration — setup, updates, real-time monitoring, secure process isolation, Nginx, PM2, and CI/CD deployment via GitHub Actions. Telegram Bots: develops advanced Telegram bots (Telegraf, Grammy) integrated with AI, payment gateways, Google Sheets, and crypto exchanges. Desktop Applications: builds cross-platform software for Windows and macOS using Electron and Rust. Additional expertise: site development and customization with WordPress and Astro.