Senior Mobile Engineer (all genders)

Kaufland e-commerce Services GmbH & Co. KG; United States; Remote; USD 84,000 - 123,000; Full time

Benefits offered by this job

Relocation package

Vacation 30 days

Urban Sports Club

Mental Well-Being Support

Sabbatical option

Pluxee meal vouchers

Deutschlandticket

Job summary

Kaufland e-commerce Services sucht einen erfahrenen Mobile/Backend-Engineer (m/w/d) mit Swift oder Kotlin, der eine modulare Architektur in der Kaufland-App mitgestaltet. Du arbeitest an Backend-Services mit TypeScript/NestJS, betreibst Observability und bist Teil eines internationalen Teams.

Du übernimmst den Feature-Lebenszyklus von Konzept bis Release, arbeitest eng mit Product und Design zusammen und bringst eine starke TDD- und Code-Wartbarkeit-Kultur mit.

Qualifications

• Erfahrung in Swift oder Kotlin, ideal beidseitige Plattformkompetenz.
• Modulare Architektur und große Codebasen navigieren können.
• Backend-Stack TypeScript mit NestJS; Neugier & Lernbereitschaft zählen.
• Starke TDD- und Maintenance-Fähigkeiten.
• Analytische Denkweise, Ownership und Observability im Production-Betrieb.
• Fließendes Englisch in einem internationalen Umfeld.

Responsibilities

• Mitwirkung an der Architektur der Kaufland-App und Webview-Architektur.
• Eigenständige Übernahme des Features-Lebenszyklus von Konzeption bis Release.
• End-to-End-Debugging über native, Webview- und Frontend-Schichten.
• Zusammenarbeit mit Product und Design zur datengetriebenen Entwicklung und A/B-Tests.
• Sicherstellen von Stabilität, Skalierbarkeit und Betrieb in Produktionsumgebungen.

Skills

Swift

Kotlin

Modulare Architektur

TDD

Observability

Englisch (C1)

Backend-Entwicklung (TypeScript/NestJS

Tools

TypeScript

NestJS

Kotlin Multiplatform

DataDog

Job description

Anstellungsdetails

Permanent contract, Full or Part-Time, Remote or Cologne / Darmstadt / Düsseldorf / Berlin

Info

Who we are
We are the tech powerhouse behind Kaufland’s international online marketplaces and a company within the Schwarz Group. Driven by a start-up mentality and working on an equal footing within flat hierarchies, we develop the best marketplace solutions for our customers, sellers and partners. #FromEuropeForEurope

Day by day, our Tech & Product Team of about 400 experts pursues the goal of creating the best possible customer shopping experience for our online marketplace. Through innovative technical developments, they not only create an outstanding shopping experience but also lay the foundation for an optimal selling experience for our sellers. Learn more about our division, areas, and cross-functional teams here !

Aufgaben

Your tasks – this is what awaits you in detail

• You'll join a platform-oriented mobile team that owns the architecture powering the marketplace experience inside the Kaufland app. Most of our challenges are not native UI work: they're about webview architecture, cross-system communication, and scalability – while we still build and maintain selected fully native features
• You'll help shape how the marketplace is integrated into the Kaufland app, working on a modular, SDK-oriented architecture designed to be maintained and evolved over the long term
• You'll take ownership of the entire feature lifecycle – from concept and design to implementation, testing, release, and monitoring in the Apple App Store and Google Play Store
• You'll debug and investigate complex issues end to end across system boundaries – native code, webviews, and the web frontend – working closely with backend and frontend engineers
• You'll collaborate in an unusually rich setup: cross-team, cross-area, and cross-company, since our marketplace is integrated directly into the Kaufland retail app
• The team's scope is growing beyond pure mobile: you'll have the opportunity to work on backend services owned by the team, expanding your skill set into new technologies
• Together with product managers and designers, you'll shape data-driven, hypothesis-based product experiences validated through A/B testing
• Our app serves millions of users, so you'll share responsibility for keeping it observable, stable, and scalable in production

Profil

Your profile – this is what we expect from you

• Solid experience in Swift and/or Kotlin, with the flexibility to work across both platforms, and a strong understanding of modern mobile engineering practices
• Experience building and maintaining projects in a modular architecture setup, and confidence navigating and debugging large, complex codebases
• A systems-thinking mindset: you enjoy investigating problems that span multiple layers and technologies more than polishing pixels
• Backend development experience – or a genuine drive to learn quickly; our backend stack is TypeScript with NestJS, and curiosity matters more to us than ticking every box
• Strong grasp of TDD principles and a commitment to clean, well-tested, maintainable code
• An analytical mindset and a strong sense of ownership for your software in production: observability, monitoring, and learning from real usage data are part of your definition of done
• You balance shipping value today with technical decisions that will still hold in two years – we evolve a platform, not just features
• AI tools are already a natural part of how you work and build software
• Fluent in English (C1) and comfortable in a dynamic, international environment

Bonus points – nice to have, not required:

• Experience developing and distributing mobile SDKs
• Knowledge of cross-platform technologies, especially Kotlin Multiplatform (KMP)
• Ability to read and debug TypeScript code when investigating cross-system issues
• Familiarity with A/B testing concepts and correct experiment implementation (we use Optimizely)
• Hands-on experience with observability tooling such as DataDog

Benefits

What we offer

• Create your own work-life balance: You have the flexibility to choose between working remotely (within Germany) or from one of our locations in Cologne, Darmstadt, Düsseldorf, or in Berlin!
• Do you want to move to Germany? No problem – we offer you an attractive relocation package to give you a smooth start.
• Urban Sports Club and RSG Group Fitness Studios: Get top deals for fitness, swimming, yoga andmore
• Mental Well-Being: We support you on your well-being journey with special offerings such as Instahelp, the digital platform for online psychological counseling
• Vacation & Sabbatical: Enjoy 30 days of vacation per year and the opportunity to take a sabbatical onceyou havebeen part of the team for a certainperiod!
• Option for Pluxee restaurant vouchers: Buy Pluxee vouchers through us and benefit from tax-advantaged meal allowances!
• ‘Deutschlandticket’: We …