---
title: "Training HelloFresh Engineers to Build Production Apps With React Native"
description: "We delivered a practical, real-world React Native training program tailored to the client’s internal architecture. In eight weeks, 15 developers were trained to work in a shared mobile codebase."
url: https://www.callstack.com/case-studies/training-hellofresh-engineers-to-build-production-apps-with-react-native
updated: 2026-10-30T18:14:16.588Z
---

# Training HelloFresh Engineers to Build Production Apps With React Native

We delivered a practical, real-world React Native training program tailored to the client’s internal architecture. In eight weeks, 15 developers were trained to work in a shared mobile codebase.

**Training HelloFresh engineers to build production apps with React Native**

_Client: [Hello Fresh](https://www.hellofresh.com) · Industry: Retail & E-commerce · Date: 2025 · Size: Enterprise_

Services: [Team Training](https://www.callstack.com/capabilities/team-training), [Migrations & Upgrades](https://www.callstack.com/capabilities/ai-assisted-migrations), [Architecture & Performance](https://www.callstack.com/capabilities/architecture-performance)

## Company: Meal kits around the world

HelloFresh SE is a German meal-kit company based in Berlin. It is one of the largest meal-kit providers in the world, operating in the United States, Australia, Canada, New Zealand, and Europe.

## Challenge: Moving to React Native without internal experience created a delivery gap

HelloFresh maintained multiple mobile apps across brands, each built with different tech stacks, including native Android and iOS as well as React Native. This inconsistency led to duplicated effort, slower rollout of shared features, and growing maintenance overhead.

To move toward a unified React Native codebase, they needed teams with different backgrounds, mostly native and web developers, to be able to deliver consistently within the new stack.

## Numbers: Key highlights

- **2.8x** increase in knowledge over 8 weeks (25% → 71% assessment scores)
- **15** developers trained across web and native backgrounds
- **86%** of devs self-rated their knowledge as 3/5 or higher after training (up from 0%)

## Our work: Designing a real-world React Native training program with HelloFresh architecture in mind

We built and delivered a structured 8-week training program combining theory, practice, and 1:1 mentorship. The curriculum covered five modules, from core React Native concepts to native modules and performance, with pre- and post-assessments to track progress.

The training was deeply integrated with HelloFresh’s internal setup:

- Real HelloFresh architecture was used for demos, code reviews, and guided tasks
- Each module included videos, live Q&A, code challenges, and Slack-based async support
- Developers worked toward a final task tied to a real HelloFresh ticket
- All materials were handed over for future cohorts, enabling internal reuse at scale
- 1:1 mentorship supported individual pacing, flexibility, and deeper learning

## Results: Skilled React Native developers ready to ship in production

By the end of the program, all 15 participants had completed the training, improved their technical fluency, and contributed to production-relevant work. Knowledge levels increased nearly 3x across key areas like JavaScript, TypeScript, React Native, and performance optimization.

![Knowledge level Cohort 1](https://www.callstack.com/assets/68710fdc211526ffb71699d7_6867e85ca1a8e96aa74d47a6_knowledge_level_cohort_light.webp)

The training helped HelloFresh reduce onboarding time for future React Native projects, improve codebase familiarity, and increase cross-brand delivery capacity without adding external headcount.

## Testimonial

> The trainers are always very helpful and supportive. Every time I’ve reached out with a question, they responded clearly and quickly. It really makes a difference!
>
> — Artem Musiienko, Staff Eng at HelloFresh

## Build and scale React Native apps.

For over a decade, enterprise teams have trusted us with React and React Native products. Our senior engineers work with AI agents on new builds, complex migrations, and native engineering. [Contact us](https://www.callstack.com/contact)

### Talk to our team

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## How we’ve solved similar challenges

- [Building Storybook Connect for JetBrains Twice as Fast With AI](https://www.callstack.com/case-studies/building-storybook-connect-for-jetbrains-in-25-working-days)
- [Teamworks cut mobile change lead time from days to minutes](https://www.callstack.com/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation)