Software Development Engineer III. (React Native) - In Store

We’re looking for React Native engineers to help build products used by millions of customers every day. 

You’ll work on high-impact features, contribute to our cross-platform direction, and collaborate closely with Product, Design, and other engineers. The team is actively evolving how it builds, so there’s real opportunity to influence both the technical direction and the way we work. 

Day to day, you’ll be turning ideas into simple, fast, and reliable mobile experiences. That includes building new features, improving what’s already there, and making sure everything scales and performs well in real-world conditions. 

The focus is straightforward: build things that work well, hold up at scale, and genuinely make life easier for customers.

How you'll contribute:

Build high-quality mobile features using React Native (+ Expo) 

Help shape architectural decisions for cross-platform development 

Balance speed and quality while delivering customer-facing value 

Collaborate across mobile, web, and platform teams 

Tackle real-world mobile challenges—performance, device fragmentation, network constraints 

Prototype, iterate, and turn ideas into production-ready features 

Support and mentor teammates as the team grows into a cross-platform model 

Real scale and impact (millions of users) 

A meaningful platform transition already in motion (not just talk) 

Opportunity to influence how React Native is adopted in a large organisation 

A team that values ownership, learning, and collaboration 

Other interesting roles:

A team that values ownership, learning, and collaboration Opportunity to influence how React Native is adopted in a large organisation A meaningful platform transition already in motion (not just talk) Real scale and impact (millions of users)

#1st Project: Whoosh (Tesco UK rapid delivery) 

You may join work on Whoosh, Tesco’s market-leading rapid grocery delivery service in the UK. 

Operates from 1,600 stores 

Reaches 70%+ of UK households 

Delivers in 20–30 minutes 

Offers a significantly larger range than typical rapid delivery apps (2,500–4,500 products) 

Whoosh is already embedded in the Tesco mobile app used across markets, including Hungary (currently turned off locally). While the app is native today (iOS and Android), we’re shifting towards React Native with Expo. 

This creates a great opportunity to: 

Build new features in React Native from scratch 

Gradually migrate existing native functionality where it makes sense 

Help shape how a large-scale app evolves towards a cross-platform setup 

You’ll be joining a mixed team of experienced web, iOS, and Android engineers, many of whom are transitioning into React Native. Because of this, a big part of the role is helping raise the bar and shape how the team works across platforms over time. 

Initially, your focus will be on React Native. Over time, you’ll also contribute to delivering features across both web and mobile, helping us keep the experience aligned across platforms.

#2nd Project: In-Store Experience 

You may join work on the In-Store Experience Mobile App, a set of features within the Tesco app designed to make shopping in physical stores faster, easier, more convenient, and more personalised. 

Integrated into the main Tesco app, making it easily accessible to millions of customers already using the platform 

Store locator helps customers find and choose the most suitable store for their shopping journey 

Enables real-time stock availability checking and precise in-store aisle location, helping customers find products quickly 

Create digital shopping lists in advance in the app – no more forgotten paper notes 

Delivers personalised in-store offers and emails 

Reduces friction throughout the shopping journey, creating a smoother and more enjoyable in-store experience 

Many more exciting features are on the way — join us and be part of shaping the future of in-store shopping at Tesco. 

The In-Store Experience is part of the wider Tesco app ecosystem, currently native (iOS and Android) and evolving towards React Native with Expo. 

This creates a great opportunity to: 

Build features that directly improve millions of in-store shopping journeys 

Work on location-aware and personalised experiences for Tesco customers 

Contribute to the shift towards a scalable cross-platform setup in Agile setup 

Strong experience building production React Native applications 

Comfortable working across both mobile and web when needed, or open to picking it up 

Confidence designing and scaling complex mobile architectures 

Solid understanding of mobile platform constraints and trade-offs 

Experience working with GraphQL APIs 

Awareness of mobile accessibility best practices 

Comfortable working across the full development lifecycle (design → build → release → iterate) 

Familiarity with Agile / Lean environments (TDD, BDD, etc. are a plus) 

A proactive mindset—ownership, curiosity, and a drive to improve things 

Bonus points for open-source contributions or side projects you’re proud of

Tesco Business Solution and Tesco Technology were established in Budapest in 2019, supporting the Tesco retail business in Central Europe and the Tesco Group. TBST and Tesco Technology are part of our global business services and technology organisations within Tesco. 

In the UK, Ireland, India, Hungary, Poland, the Czech Republic we operate to offer great value to our customers every day. 

In Budapest, our Technology hub currently employs more than 200 – and a growing number – of highly trained software engineers and managers who are implementing global software development projects across fulfilment, supplier and product management, online and in-store loss prevention, and our online grocery sites. 

Our goal is to bring significant changes to the market by using the latest technologies. We are focusing on a large variety of modern technologies from the backend space and frontend to UX, UI and even data science and engineering. 

We are aiming to drive business value through innovation and to create an organization that fundamentally transforms the retail environment. 

We put accountability and ownership on the individuals and their teams in order to run a horizontal organization where teamwork is extremely important. With an end-to-end approach, we offer our colleagues opportunities for self-development and career growth. 

Our colleagues are the key to our success at Tesco. We foster an environment of openness and collaboration. We draw from the diversity, knowledge and experience of our colleagues. It is all about equal opportunities, no matter who you are, or where you come from, you can get on at Tesco. 

Our teams consist of individuals who can truly make a difference. Focussing on building a world-class business services centre alongside cutting-edge technology capability, they are working towards our goal of serving our customers and colleagues a little better every day. 

We are expanding our operations locally and we are looking for the best talent.