Senior iOS developer

Tangem is a blockchain technology company founded in 2017, headquartered in Zug, Switzerland, with branches in North America, Eastern Europe, and APAC. We make a smartcard-based hardware cold wallet and the mobile app that comes with it: it is used in 220 countries, and a single wallet supports thousands of tokens across dozens of blockchains.

About the project The Tangem iOS app is a self-custodial crypto wallet that works with Tangem hardware cards over NFC and with mobile-only wallets. It covers the full product surface: multi-chain balances and transactions for dozens of networks, token swaps, staking, NFTs, WalletConnect, and Tangem Pay, a Visa card that lets users spend crypto anywhere cards are accepted. The app holds people's money, so security is a first-class requirement in everything we build.

• 5+ years of iOS development experience, including production apps you have shipped and supported.
• Strong Swift, SwiftUI, and Foundation skills; solid understanding of multithreading with hands-on experience in Swift Concurrency, Combine, and GCD.
• Understanding of core programming principles (OOP, SOLID, KISS, DRY, YAGNI) and the discipline to follow them.
• Experience with iOS app architecture (MVVM, Coordinator, dependency injection, modularization with SPM) and the ability to design features that fit the existing structure without overengineering.
• Experience writing unit tests with Swift Testing as part of everyday development.
• A security-minded approach: you know mobile security fundamentals (Keychain, Secure Enclave, secure networking, sensitive data handling), think about how a change could be abused, and raise doubts early.
• Everyday use of AI coding tools with the judgement to verify their output.
• Senior-level independence and clear communication: you raise blockers, risks, and schedule changes early.
• English at B2 or above, written and spoken, including calls with native speakers.

Nice to have:• Experience with cryptography in mobile apps: CryptoKit, secp256k1, ed25519, BIP32/BIP39.

• Understanding of blockchain principles, wallets, and transaction signing.
• Experience with CoreNFC.
• Experience with UI and snapshot testing.

• Design and build new features of the Tangem iOS app, from technical design to release.
• Clarify incomplete requirements, surface dependencies and risks, and propose technical solutions before implementation.
• Split work into small, logically complete pull requests and integrate changes continuously.
• Write automated tests and verify your features, including edge cases and negative scenarios, before handing them to QA.
• Review colleagues' pull requests regularly and give reasoned, actionable feedback.
• Own your tasks until they are released.

Tech stack:• Swift, SwiftUI, Combine, Swift Concurrency, Swift Package Manager

• Moya / Alamofire
• Tangem SDK for NFC card communication, WalletConnect
• Swift Testing, XCTest, XCUITest, snapshot tests
• fastlane, GitHub Actions
• Firebase Crashlytics, Amplitude
• Claude Code and Codex as everyday engineering tools

• A strong cross-functional team: iOS, Android, backend, QA, analytics, and product.
• Real ownership: you directly influence the product and its architecture.
• Minimal bureaucracy and fast decision-making.
• Remote work from anywhere in the world, with a schedule aligned with Cyprus time (EET, UTC+2/+3).
• Competitive salary in EUR/USDT;
• Unlimited vacation;
• Birthday presents;
• Compensation for the purchase of necessary technical devices for the work;
• Paid sick leave.