At FDJ UNITED, we don't just follow the game, we reinvent it.

FDJ UNITED is one of Europe's leading betting and gaming operators, with a vast portfolio of iconic brands and a reputation for technological excellence. With more than 5,000 employees and a presence in around fifteen regulated markets, the Group offers a diversified, responsible range of games, both under exclusive rights and open to competition. We set new standards, proving that entertainment and safety can go hand in hand. Here, you'll work alongside a team of passionate individuals dedicated to delivering the best and safest entertaining experiences for our customers every day.

We're looking for bold people who are eager to succeed and ready to level-up the game. If you thrive on innovation, embrace challenges, and want to make a real impact at all levels, FDJ UNITED is your playing field.

Join us in shaping the future of gaming. Are you ready to LEVEL-UP THE GAME?

What you'll work on

Build and evolveSwiftUI feature modulesacross the KSP stack

Integrate KSP into theSports host appvia shared contracts

Design and maintainmodular SPM APIs, keeping module boundaries clean and public surfaces intentional

Implementreal-time sportsbook experiences: odds/live data flows, navigation, analytics, localization, and media

Own quality end-to-end: unit tests, SwiftUI view tests, lint/format, CI feedback, and PR hygiene

Collaborate with product, design, QA, and other platform teams on high-impact sportsbook journeys

Our tech stack (what you'll use day to day)

Language & platform:Swift 5.10+, SwiftUI, iOS 17+, Xcode

Architecture:Modular Swift Packages,



feature-oriented modules composed through an integration layer

Dependency injection:Factory (Container-based DI, test/preview-friendly registrations)

Concurrency & reactivity:Structured concurrency (async/await), preference for modern Observation patterns

Networking & realtime:REST-style providers plus MQTT/WebSocket for live offering data

Testing:Swift Testing (preferred for new tests), ViewInspector for SwiftUI

Tooling & delivery:SwiftLint, SwiftFormat, Git hooks, Jira, GitLab, Jenkins/CI, Fastlane

Adecuado profile Must-have

Solid commercial experience buildingproduction iOS apps or librariesinSwift

StrongSwiftUIskills: composition, navigation, state management, performance-aware UI

Comfortable withmodular Swift Packagedevelopment and multi-repo / multi-package dependency graphs

Practical experience withasync/awaitand main-actor boundaries, able to reason about concurrency bugs

Experience writingunit testsand testing UI behavior (XCTest and/or Swift Testing)

Ability to work in a large codebase with shared components, strict linting, and CI gates

Clear communication in English and confidence collaborating across squads

Nice-to-have

Experience withFactory, Resolver, or similar DI containers

Exposure toCombineand migration toward Observation /@Observable





Realtime systems experience (MQTT, WebSockets, push-driven UI)

Sportsbook, betting, trading, or other high-frequency / odds-driven product experience

Experience embedding libraries into a host app (SDK-style delivery, integration contracts, versioning)

Familiarity with analytics/tracking instrumentation, localization pipelines, or media/player SDKs

Comfort with GitLab, conventional PR reviews, and Jira-linked delivery

What success looks like

You deliver reliable sportsbook features with clean module boundaries and predictable integrations

You write testable, maintainable Swift that fits existing KSP conventions

You improve live UX quality under real conditions: odds updates, navigation, betslip flows, and streaming

You leave the codebase healthier than you found it: better tests, clearer APIs, fewer regressions

Soft skills we value

Product mindset: you care about customer journeys, not only tickets

Pragmatism: prefer simple solutions, abstract complexity only when needed

Ownership: you follow work through build, test, review, and production feedback

Collaboration: you can partner with web / backend sportsbook teams and host-app iOS engineers

We believe talent knows no boundaries. Our hiring process focuses solely on your skills, experience, and potential to contribute to our team. We welcome applicants from all backgrounds and evaluate each candidate based on merit, regardless of personal characteristics as the age, gender, origin, religion, sexual orientation, neurodiversity or disability.

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📌 iOS Senior Engineer (Madrid)
🏢 FDJ UNITED
📍 Madrid