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Senior iOS Engineer at Velotio Technologies. Velotio Technologies is a product engineering company working with innovative startups and enterprises. We are a certified  and recognized as one of the best companies to work for in India. We have provided full-stack product development for 110+ startups across the globe building products in the cloud-native, data engineering, B2B SaaS, IoT & Machine Learning space. Our team of 400+ elite software engineers solves hard technical problems while transforming customer ideas into successful products.. We are seeking a Senior iOS Engineer to join our SDK development team. You will be responsible for maintaining, enhancing, and developing a secure payment processing iOS SDK that handles sensitive financial data in compliance with enterprise-grade security standards.. . SDK Development & Maintenance: Lead development of modular iOS SDK components related to core logic, security, UI, and analytics.. . Security Implementation: Implement and maintain PCI DSS–compliant encryption, SSL pinning, and secure data handling mechanisms.. . Payment Processing: Develop and maintain secure payment method creation and transaction processing logic.. . UI Component Development: Build and maintain secure, customizable payment form components using SwiftUI.. . Network Layer Architecture: Design and implement robust, testable network layers with retry logic and error handling.. . Testing & Quality Assurance: Write comprehensive unit and integration tests; ensure high test coverage.. . Documentation: Create and maintain technical documentation, API references, and implementation guides.. . Code Review & Mentorship: Review code from junior developers and provide technical guidance.. . Required Technical Skills:. . Core iOS Development. . . Swift 6.1+ – Expert-level proficiency with modern Swift features. . iOS 13.0+ – Deep understanding of platform capabilities. . SwiftUI & UIKit – Advanced UI development. . Swift Package Manager – Experience with dependency management. . Xcode – Proficient with debugging, profiling, and tools. . . Security & Cryptography. . . SHA-256, CommonCrypto, SSL/TLS Pinning. . PCI DSS Compliance, Secure Memory Management, Keychain Services. . . Network & API Development. . . Async/Await, URLSession, RESTful APIs, Codable, Error Handling. . Protocol-Oriented Programming for modular, testable networking. . . Architecture & Design Patterns. . MVVM, Protocol-Based Design, Builder, Singleton, Observer, Factory. . Testing & Quality. . Unit Testing (XCTest), Integration Testing, Mocking, TDD, CI Integration. . Payment Processing Knowledge. . Credit Card Validation, Gateway Integration, Transaction Handling, Security Standards. . Advanced Technical Concepts. . . Memory Safety, Secure Data Wrapping, Thread Safety. . Network Security (cert validation, pinning, interceptors). . Form Validation (real-time, accessibility, i18n). . Error Handling (types, retry logic, resilience). . Performance Optimization (networking, UI rendering, memory usage). . . Experience Requirements:. . 6+ years of iOS development experience. . 3+ years working with payment processing or financial applications. . 2+ years of experience in security-focused development. . Proven track record of shipping production SDKs or libraries. . Experience with enterprise-grade applications and compliance requirements. . Good to have:. App Store Connect, Advanced Git workflows, Agile/Scrum. Company Location: India.