Lead Software Engineer, Mobile Platform

As our Lead Software Engineer, you will own the architectural vision and technical strategy for the entire Stax mobile ecosystem. This is a hands-on role for a leader passionate about user experience and cutting-edge technology. You will not only develop our core apps, SDKs, and device integrations, but also mentor a talented team, empowering them to build solutions that are critical to our business goals.

Key Responsibilities & Objectives

• Architect, develop, and maintain Stax's core mobile product offerings, including the 'Stax Pay' apps (iOS/Android), public-facing payment SDKs (Kotlin/Swift), and payment terminal integrations.
• Act as the key technical partner for product teams to architect and deliver new features across our mobile, card reader, and terminal platforms.
• Drive integrations with Android-based hardware devices and ensure seamless performance across environments.
• Enhance and support mobile-centric technologies including tokenization scripts, backend services, and terminal customizations.
• Define and champion the coding standards, architectural patterns, and best practices that ensure quality and consistency across all mobile development.
• Mentor and guide engineers across teams on mobile platform technologies and SDK usage.
• Maintain and continuously improve developer documentation for SDKs and integrations.
• Translate business requirements into technical specifications, collaborating with product managers and external partners to define roadmaps and ensure alignment.
• Own the end-to-end mobile app distribution process, from publishing and updates to managing all interactions with the Apple App Store and Google Play Store review teams.

• Bachelor’s degree in Computer Science or equivalent practical experience.
• 7 years of professional mobile development, with deep expertise in Android (Kotlin) or iOS (Swift) and strong proficiency in the other.
• 3 years of experience working on a mobile product that served at least tens of thousands of weekly active users.
• A minimum of 2 years in a technical leadership role (e.g., Project Lead, Senior Engineer with mentorship duties) overseeing complex, multi-layered mobile projects.
• Experience leading or mentoring teams in SDK and mobile platform development.
• Track record of managing widely distributed SDKs with versioning, backward compatibility, and developer adoption in mind.
• Familiarity with mobile app distribution processes and review team interactions for both Apple App Store and Google Play Store.
• Experience managing platform-specific capabilities that cross-platform frameworks cannot fully support, such as Bluetooth permissions, networking, background services, push notifications, and secure storage.
• Strong expertise with at least one mobile package manager (e.g., Cocoapods for iOS or Maven Central/Gradle for Android) to support SDK commercialization and distribution.
• Proven ability to foster a collaborative and supportive team environment through empathetic leadership, mentorship, and constructive feedback, as demonstrated by professional references from former colleagues.
• Strong problem-solving skills and demonstrated ability to work across diverse technologies.

Preferred Qualifications

• Experience integrating with Android-based payment terminals (e.g., Dejavoo, Verifone).
• Background in FinTech or payments technology.
• Familiarity with Cocoapods, CI/CD pipelines (Gradle, Fastlane), and Firebase (e.g., push notifications).
• Familiarity with mobile testing frameworks and developer experience tooling.
• 2 years of experience with frontend or backend JavaScript/TypeScript applications.

Why You’ll Love Working at Stax

• Impact: You’ll be at the heart of our mobile strategy, building technology that directly empowers merchants to run their businesses. This is a highly impactful and meaningful domain, as our product is core to the day-to-day operations of our users.
• Growth: We're committed to your professional development with opportunities to learn new technologies and take on greater leadership responsibilities.
• Culture: Join a collaborative, innovative, and supportive team that values curiosity and a passion for building great software.