Senior iOS SDK Developer

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.

• 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)

• 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

• We have an autonomous and empowered work culture encouraging individuals to take ownership and grow quickly.
• Flat hierarchy with fast decision making and a startup-oriented "get things done" culture.
• A strong, fun & positive environment with regular celebrations of our success. We pride ourselves in creating an inclusive, diverse & authentic environment.

At Velotio, we embrace diversity. Inclusion is a priority for us, and we are eager to foster an environment where everyone feels valued. We welcome applications regardless of ethnicity or cultural background, age, gender, nationality, religion, disability or sexual orientation.