Process, Questions & AI Prep Tips
Supabase is the open source Firebase alternative built on PostgreSQL. It provides a developer-friendly backend platform with authentication, real-time subscriptions, storage, and edge functions. Engineering challenges include building highly reliable PostgreSQL infrastructure as a service, the Realtime server built in Elixir that scales WebSocket subscriptions, and the developer experience tools that make Supabase the fastest way to build backends.
A 30-minute call about your background in database infrastructure, open-source platforms, or developer tools.
A 60-minute coding interview with strong algorithmic and PostgreSQL-adjacent problems.
Design a Supabase system such as the PostgreSQL provisioning and isolation system, the Realtime subscription engine, the storage CDN layer, or the edge functions runtime.
Two to three rounds with deep technical design, coding, and strong culture fit emphasis. Supabase has a strong open-source engineering culture.
Design Supabase's PostgreSQL-as-a-service provisioning that creates isolated database instances for each project.
How would you build the Supabase Realtime server that delivers database change events to subscribed clients?
Design a Row Level Security (RLS) policy evaluation system that enforces per-user data access at the database level.
How would you build Supabase Storage that handles file uploads and serves files via CDN?
Design the Supabase Edge Functions runtime that executes Deno-based serverless functions at the edge.
How would you implement Supabase Auth with support for email/password, OAuth providers, and magic links?
Design a connection pooler (PgBouncer-style) that handles thousands of concurrent connections to PostgreSQL.
How would you build a schema migration system that safely applies DDL changes to live databases?
Design the Supabase Dashboard that lets developers manage their database schema without writing SQL.
Tell me about a time you contributed to an open-source infrastructure project.
Deep PostgreSQL knowledge is essential — understand WAL (Write-Ahead Log) for change data capture, Row Level Security, logical replication, and connection management.
Study Elixir/Phoenix and how Supabase's Realtime server uses Phoenix Channels and GenStage for scalable WebSocket subscriptions.
Supabase is open source — demonstrating genuine commitment to open-source principles, community engagement, and building in public will resonate strongly.
Review multi-tenancy patterns for PostgreSQL — schema-based isolation, row-level isolation, and instance-level isolation each have trade-offs.
Understand the Firebase comparison Supabase makes — knowing what Firebase offers and how Supabase differentiates with an open-source, PostgreSQL approach helps frame design discussions.
AissenceAI provides AI-powered interview coaching tailored specifically to Supabase's interview process. Practice with realistic mock interviews that mirror Supabase's 4-round format, get real-time feedback on your coding solutions, and receive personalized tips based on your performance.
Get AI-powered mock interviews, real-time coding assistance, and personalized coaching tailored to Supabase's interview process.
Start Preparing Free