What tech stack does Replit use?

Replit's infrastructure is built primarily on Google Cloud Platform, a relationship formalized by Google's AI Futures Fund investment (April 2023, September 2025) and recognized by Google Cloud's 2026 AI Tooling Partner of the Year award. The platform uses Google Kubernetes Engine (GKE) for container orchestration, Google Compute Engine for raw compute, Cloud SQL (PostgreSQL) for relational data, and Google Cloud Storage for object storage. AI inference for Replit Agent and Ghostwriter runs through Google's Vertex AI using Gemini models — a production-grade integration that goes beyond the typical API wrapper to include optimized serving infrastructure. SOC 2 Type 2 compliance is in place, with TLS 1.2+ in transit and AES-256 at rest; ISO 27001 compliance is also documented in the GCP partnership materials.

In July 2025, Replit announced a strategic partnership with Microsoft, making Replit available on Azure Marketplace and integrating with Azure Container Apps, Azure Virtual Machines, and Neon Serverless Postgres. This is explicitly a non-exclusive arrangement — GCP remains the primary cloud — but it expands enterprise procurement routes for Microsoft-shop customers. On the backend, Node.js and Go handle the primary API and application layers; C++ underpins the low-level containerized execution sandbox that runs user code across 50+ languages without local setup. GraphQL powers the API surface between frontend and backend. Cloudflare sits in front as CDN, DDoS protection, and bot defense (backed by hCaptcha). Replit caches over 10TB of language packages to enable instant multi-language execution.

Replit builds an unusually large share of its infrastructure in-house: the auth system (Replit Auth), the database (Built-in Database), the deployment pipeline (One-Click Deploy), and now the payments layer (Visa Intelligent Commerce integration, May 2026) are all first-party products rather than third-party dependencies. This vertical integration is core to the product's low-friction promise but creates meaningful vendor displacement risk for conventional dev-infra vendors targeting Replit as an end-customer.

The frontend is built in React and TypeScript, served via Next.js for SSR and performance. Emotion handles CSS-in-JS styling. Agent 4's Design Mode (launched March 2026) introduced a visual design layer that sits atop the code generation pipeline, suggesting a growing frontend engineering investment in design-system and rendering infrastructure.

Segment (Twilio) is the customer data platform, routing behavioral and product analytics events to downstream tools including Google Analytics. Sentry provides real-time error tracking across frontend and backend. On the GTM side, HubSpot is reported as a marketing automation tool — consistent with a product-led growth company running lifecycle campaigns to free-to-paid conversion. Salesforce is the most likely enterprise CRM given the named-account deal complexity (Zillow 600 seats, Labcorp enterprise agreement), though neither Salesforce nor HubSpot as CRM has been officially confirmed. Mailgun handles transactional email. Stripe processes all subscription and usage-based billing; notably, Replit also ships Stripe as a first-party integration that Replit builders can embed in their own apps — and the May 2026 Visa partnership extends this with Visa Intelligent Commerce for agentic payment flows.

The July 2025 Microsoft partnership adds Neon Serverless Postgres as a supported data layer for enterprise customers who prefer Azure-native managed Postgres over Replit's built-in database. This opens a new category of infrastructure vendor relationships — managed database and data warehouse vendors that want Replit app builders to use their platform for persistent data.

The GCP-primary posture means any vendor with a GCP Marketplace listing or native GCP integration has a structural advantage in a Replit procurement conversation. GCP Marketplace co-sell relationships are particularly valuable: Replit's Google partnership means GCP field reps are already embedded in the Replit account relationship. Security and compliance vendors (SOC 2, secrets management, identity, vulnerability scanning) are a high-priority category as Replit onboards Fortune 500 accounts in regulated industries like healthcare (Labcorp) and financial services (Visa partnership).

The Microsoft Azure Marketplace listing (July 2025) creates a parallel procurement path for vendors who are Azure-native — particularly managed database vendors, integration platform vendors, and Microsoft 365 ecosystem players. The Neon Serverless Postgres integration suggests Replit is willing to adopt Azure-native data services where customer demand exists.

For vendors that want to sell through Replit's platform rather than to Replit as an end-customer: the Replit Connector ecosystem (30+ integrations including Stripe, Salesforce, Figma, Snowflake, Databricks) and the new Solution Partner Program (Accenture, Slalom, Hexaware as founding partners, announced May 2026) are the two entry points. A Connector integration makes your product discoverable to Replit's 50M+ user base and 500,000+ business accounts. A Solution Partner certification puts you in front of Replit's enterprise sales motion. Both require direct engagement with Replit's partnership team via replit.com/partners.