Senior Android Engineer (Kotlin)

Software at Scale; Sydney; On-site; AUD 150,000 - 230,000; Full time

Benefits offered by this job

Claude Code access

Clear growth pathways

Job summary

Software at Scale is seeking an AI-powered Senior Android Engineer to upgrade a high-scale Android application used for secure financial transactions. You will own the native architecture, security posture, and high-performance API integrations in a demanding fintech environment.

The role requires deep Kotlin expertise, Jetpack Compose, and hands-on experience with secure tokenization and Passkeys. You will leverage Claude Code and enterprise GenAI tooling to accelerate refactoring and delivery

Qualifications

• Proven experience designing and scaling Android apps at scale.
• Strong Kotlin expertise with Jetpack Compose and coroutines.

Responsibilities

• Lead native app modernization using Kotlin and modern libraries.
• Architect banking-grade security, including Android Keystore and Passkeys.
• Ensure high-scale financial transaction handling and secure token storage.
• Orchestrate integration with backend REST/GraphQL services.

Skills

Android

Kotlin

Jetpack Compose

Security (Fintech)

API Integration

AI tooling

Tools

Claude Code

Job description

Our 'black belt' specialists are leaders in their domains: digital champions, delivery-focused experts, top-tier security professionals, AI thought leaders, and engineering best practice advocates.

As 1 of Australia’s fastest-growing software businesses, Software at Scale delivers cutting-edge technology solutions that power mission-critical platforms. We solve complex engineering challenges at scale, driving quality, performance, and resilience through the strength of our people.

Our 'black belt' specialists are leaders in their domains: digital champions, delivery-focused experts, top-tier security professionals, AI thought leaders, and engineering best practice advocates.

As 1 of Australia’s fastest-growing software businesses, Software at Scale delivers cutting-edge technology solutions that power mission-critical platforms. We solve complex engineering challenges at scale, driving quality, performance, and resilience through the strength of our people.

The Role & The Challenge

We are seeking an exceptional, highly proactive AI-Empowered Senior Android Engineer (proficient in modern Kotlin) to take our existing high-scale Android application to the next level. This is a massive-scale upgrade mandate for a financial-grade digital platform handling high volumes of sensitive financial transactions and credit card data.

If you are content with picking up standard UI tickets, this is not the role for you. We want an elite Android specialist who understands banking-grade security inside and out. You will step into a high-trust, fully empowered environment where you are expected to take complete technical ownership of the app's native architecture, security posture, and high-performance API integration layers.

AI Access & Claude Code: We actively encourage our engineers to solve problems using AI. You will have full access to enterprise GenAI tooling, including Claude Code, to accelerate refactoring, code generation, and pipeline management.

Key Responsibilities

• Native App Modernisation: Spearhead the deep architectural upgrade of our existing Android application, leveraging the absolute latest Kotlin libraries, frameworks, Jetpack Compose, and coroutine architectures.
• Banking-Grade Mobile Security: Architect bulletproof security controls. Implement hardware-backed key management using the Android KeyStore, secure storage of payment tokens, and seamless Passkey (WebAuthn) authentication flows.
• High-Scale Financial Transactions: Ensure uncompromised stability, speed, and data protection for large-scale financial transactions and direct credit card entry pathways.
• Complex API Integration: Orchestrate high-throughput, secure communication layers integrating a massive suite of backend REST and GraphQL microservices with minimal latency.
• Performance & Efficiency: Optimise memory footprints, thread execution, and network rendering to guarantee ultra-efficient, butter-smooth app processing under heavy load.
• AI-Driven Engineering: Extensively utilise Claude Code and modern agentic tools to test, refactor, and build out native features faster.
• DevOps & CI/CD: Maintain automated mobile CI/CD pipelines (Fastlane, GitHub Actions) for seamless, secure Google Play deployments and automated testing suites.

What You Bring

• Large-Scale Mobile Experience: Proven commercial history of designing, building, and scaling large-scale consumer or enterprise Android apps used by millions.
• Kotlin Mastery: Deep, hands-on expertise in modern Kotlin (Jetpack Compose, coroutines, Flow) using the absolute latest platform libraries and ecosystem standards.
• Fintech Security Expertise: Mandatory commercial background in banking or financial services mobile apps. You have direct, hands-on experience handling credit card entry compliance, secure tokenisation, and implementing Passkeys alongside Android KeyStore encryption.
• API Integration Pro: Extensive experience managing complex network layers, certificate pinning, payload encryption, and integrating a high volume of enterprise APIs.
• Performance Obsession: A rigorous focus on app efficiency, battery optimisation, smooth frame rendering, and offline-first data synchronisation.
• AI Fluency: Practical experience using Claude Code and AI tooling to accelerate mobile development workflows.

What We Offer

• The chance to work for 1 of Australia's fastest-growing and most innovative software businesses.
• Full access to cutting-edge AI tooling, including Claude Code.
• Meaningful, hands-on mobile engineering work on mission-critical financial software.
• Clear growth pathways from Senior to Staff and beyond.
• A low-ceremony, delivery-focused environment that values engineers who own outcomes.
• Competitive remuneration and benefits.