Bloom (YC X25) Tech Stack

Mobile app builder with AI-native code generation and cross-platform deployment

Software Development Zurich 2–10 employees Founded 2025 Privately Held

Bloom is a mobile-first app development platform built on TypeScript, React Native, Expo, and Convex, with a founding team skewed toward senior engineers (4 of 6 hires). The company is actively scaling a reliable coding agent for full-stack apps while tackling hard problems in automated testing and mobile performance — core technical bets that map directly to their stated mission of faster app shipping. Early-stage hiring pattern (no roles posted in 30 days, all senior/lead placements) suggests they're focused on execution rather than rapid scaling.

Tech Stack 14 technologies

Core StackTypeScript Swift Kotlin React Native React Figma Airtable Python Expo Convex Objective-C Notion Webflow SQL

What Bloom (YC X25) Is Building

◆Challenges

Building reliable coding agent
Data migrations
Automatically testing app quality
Scaling viral engine
Building brand aesthetic
Driving network effects
Building world-class mobile dx
Scaling mobile stack to hundreds of thousands
Testing and monitoring quality and performance
Scaling internal operations

▲Active Projects

Reliable coding agent for full-stack apps
Granular control tools for front-end/backend/back-office
Internal operational tools
Build brand aesthetic
Build creator community
Design creative campaigns
Bloom mobile app development
Cross-platform feature integration
Ai-native go-to-market strategy
Data-driven acquisition metrics model

Hiring Activity

Minimal6 roles · 0 in 30d

Department

Engineering

Marketing

Seniority

Senior

Intern

Lead

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About Bloom (YC X25)

Bloom is a YC-backed mobile application development platform founded in 2025, based in Zurich. The product sits at the intersection of code generation and mobile deployment, enabling developers to build and ship iOS and Android apps faster. The tech stack reflects a modern, API-first approach: TypeScript for core logic, React Native and Expo for cross-platform mobile code, Convex for backend infrastructure, and a suite of design and operational tools (Figma, Notion, Airtable) for workflow management. The team is distributed across engineering and marketing, with a focus on building both the platform itself and the creator community around it.

HeadquartersZurich

Company Size2–10 employees

Founded2025

Hiring MarketsSwitzerland

Frequently Asked Questions

What tech stack does Bloom use?

Bloom's primary stack includes TypeScript, React Native, Expo, Convex, Swift, Kotlin, React, and SQL. Design and operational tools include Figma, Notion, Webflow, and Airtable.

What is Bloom working on?

Bloom's roadmap centers on a reliable coding agent for full-stack mobile apps, granular control tools across front-end, backend, and back-office layers, cross-platform feature integration, and an AI-native go-to-market strategy focused on creator adoption and network effects.