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The One Studio Tech Stack

Tech staffing studio specializing in mobile, web, and product talent

IT Services and IT Consulting Boulogne-Billancourt, Île-de-France 11–50 employees Founded 2023 Privately Held

The One Studio is a 11–50 person staffing firm in France focused on placing and managing mobile engineers (iOS, Android, Flutter), JavaScript full-stack developers, UX/UI designers, and product managers. The active project mix—native-to-Flutter migrations, LLM/RAG industrialization, backend scaling for fintech—reveals clients are moving away from platform-specific native development toward cross-platform tooling while layering AI capabilities. Heavy senior/lead hiring (13 of 17 open roles) suggests a focus on high-touch delivery and architectural responsibility.

Tech Stack 75 technologies

Core StackKotlin GitHub Jira Confluence Firebase Selenium Postman JavaScript TypeScript GitLab Flutter GitHub Actions Google Analytics Figma Sketch InVision Node.js Android Studio Bitrise REST Assured SoapUI Git Dart Riverpod SQLite Data Studio Adobe XD Hotjar Contentsquare Serverless+39 more

AdoptingSwift SwiftUI

ReplacingiOS Android

What The One Studio Is Building

◆Challenges

Model reliability and security
Migrating legacy mobile apps to flutter
Scaling backend for fintech growth
Performance optimization
Restructuring user journeys
Design system scalability
High business impact
Industrialization at scale
Industrializing ml models
Scaling large-scale iot platform

▲Active Projects

New flutter application development
Migration of native apps to flutter
Developing scalable backend solution
Evolving technical architecture
Design system & scalability
Ai & innovation design
Llm and rag feature industrialization
Llm architecture exploration
Mobile assistant application
Large-scale iot cloud platform

Hiring Activity

Decelerating15 roles · 4 in 30d

Department

Engineering

10

Design

3

Product

2

Sales

1

Seniority

Senior

11

Lead

2

Mid

2

Manager

1

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About The One Studio

The One Studio staffs engineering, design, and product teams at French digital companies. The practice spans mobile development (Kotlin, Swift, Flutter, Dart), JavaScript full-stack work (Node.js, TypeScript), and design tooling (Figma, Adobe XD, Sketch). Current client engagements include Flutter app migrations, backend infrastructure for fintech scaling, design system work, and LLM feature development. The firm was founded in 2023 and operates from Boulogne-Billancourt. Hiring is weighted toward senior and lead roles, indicating a model centered on delivery accountability rather than junior team expansion.

HeadquartersBoulogne-Billancourt, Île-de-France

Company Size11–50 employees

Founded2023

Hiring MarketsFrance

Frequently Asked Questions

What tech stack does The One Studio work with?

Primary: Kotlin, Swift, Flutter, JavaScript/TypeScript, Node.js, Firebase, Figma, Adobe XD. Testing/CI: Bitrise, GitHub Actions, Selenium, Postman. Design analysis: Hotjar, Contentsquare, Google Analytics. The firm is adopting SwiftUI while phasing away from iOS and Android native tools in favor of cross-platform.

What are The One Studio's current projects?

Flutter migration of legacy native apps, backend scaling for fintech clients, LLM/RAG feature industrialization, mobile assistant applications, IoT cloud platform development, and design system scalability work.