Senior Staff Software Engineer, Mobile Infrastructure

Seoulstart; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Seoulstart is seeking a senior mobile engineer to build and maintain native iOS and Android infrastructure and reusable components. You will optimize memory usage, startup time, and package size while shaping cross‑platform standards with product teams.

You will actively use AI coding tools like Claude Code or Codex in production workflows to accelerate infrastructure development and improve performance at scale. Collaboration with global teams is essential.

Qualifications

• 6+ years of native iOS or Android development with infrastructure focus.
• Deep expertise in iOS (Swift, Objective-C, C++) or Android (Kotlin, Java, Jetpack).
• Active use of AI coding tools in engineering workflow in production work.
• Proven experience optimizing app performance at scale in production environments.
• Strong communication skills and collaboration across global teams.

Responsibilities

• Build and maintain mobile infrastructure and shared frameworks to boost engineering efficiency.
• Analyze and optimize app code for memory footprint, package size, and startup performance.
• Design reusable, scalable mobile components for iOS and Android platforms.
• Partner with product engineering teams to establish best practices and standards.
• Apply AI coding tools to accelerate infrastructure development and cross‑platform solutions.

Skills

iOS development

Android development

performance optimization

cross-team collaboration

AI tooling in workflow

Swift/Obj-C/C++/Kotlin/Java

Tools

Claude Code

Codex

Job description

What you'd do

• Build and maintain mobile infrastructure and shared frameworks that improve engineering efficiency.
• Analyze and optimize app code for memory footprint, package size, and startup performance.
• Design reusable, scalable mobile components for use across iOS and Android platforms.
• Partner with product engineering teams to establish best practices and technical standards.
• Apply AI coding tools to accelerate infrastructure development and cross-platform solutions.

What they want

• 6+ years of native iOS or Android development experience with an infrastructure or platform track record.
• Deep expertise in iOS (Swift, Objective-C, C++) or Android (Kotlin, Java, Jetpack).
• Active use of AI tools in engineering workflow, such as Claude Code or Codex, on production work.
• Proven experience optimizing app performance at scale in production environments.
• Strong communication skills, comfortable collaborating across global teams.

Nice to have

• Experience working in a dedicated mobile architecture or infrastructure team.
• Familiarity with cross-platform frameworks such as React Native or Flutter.
• Experience in fintech, crypto, or other high-scale consumer app environments.

Experience working in a dedicated mobile architecture or infrastructure team.

Familiarity with cross-platform frameworks such as React Native or Flutter.

Experience in fintech, crypto, or other high-scale consumer app environments. 6+ years of native iOS or Android development experience with an infrastructure or platform track record.

Deep expertise in iOS (Swift, Objective-C, C++) or Android (Kotlin, Java, Jetpack).

Active use of AI tools in engineering workflow, such as Claude Code or Codex, on production work.

Proven experience optimizing app performance at scale in production environments.

Strong communication skills, comfortable collaborating across global teams.