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I'm Dongbin Suh, a Senior iOS Engineer with experience scaling large-scale systems at TikTok and delivering 0→1 mobile products in stealth startups. I enjoy building end-to-end features with a focus on reliability, iteration speed, and maintainability, and I like collaborating on product direction and UX decisions. Based in Castro Valley, CA, I'm open to opportunities in early-stage product development where I can apply my end-to-end engineering mindset to bring ambitious mobile products to life.…I'm Dongbin Suh, a Senior iOS Engineer with experience scaling large-scale systems at TikTok and delivering 0→1 mobile products in stealth startups. I enjoy building end-to-end features with a focus on reliability, iteration speed, and maintainability, and I like collaborating on product direction and UX decisions. Based in Castro Valley, CA, I'm open to opportunities in early-stage product development where I can apply my end-to-end engineering mindset to bring ambitious mobile products to life.

Dongbin Suh

App Developer, Full Stack Developer, Back-End Developer, +1

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I'm Dongbin Suh, a Senior iOS Engineer with experience scaling large-scale systems at TikTok and delivering 0→1 mobile products in stealth startups. I enjoy building end-to-end features with a focus on reliability, iteration speed, and maintainability, and I like collaborating on product direction and UX decisions. Based in Castro Valley, CA, I'm open to opportunities in early-stage product development where I can apply my end-to-end engineering mindset to bring ambitious mobile products to life.…I'm Dongbin Suh, a Senior iOS Engineer with experience scaling large-scale systems at TikTok and delivering 0→1 mobile products in stealth startups. I enjoy building end-to-end features with a focus on reliability, iteration speed, and maintainability, and I like collaborating on product direction and UX decisions. Based in Castro Valley, CA, I'm open to opportunities in early-stage product development where I can apply my end-to-end engineering mindset to bring ambitious mobile products to life.

Available to hire

I’m Dongbin Suh, a Senior iOS Engineer with experience scaling large-scale systems at TikTok and delivering 0→1 mobile products in stealth startups. I enjoy building end-to-end features with a focus on reliability, iteration speed, and maintainability, and I like collaborating on product direction and UX decisions.
Based in Castro Valley, CA, I’m open to opportunities in early-stage product development where I can apply my end-to-end engineering mindset to bring ambitious mobile products to life.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

iOS Engineer at Stealth Startup

September 1, 2025 - Present

Designed modular SwiftUI architecture to enable scalable feature development in a 0→1 mobile product environment. Standardized async/await concurrency patterns across network workflows, eliminating race conditions and improving state consistency. Delivered end-to-end iOS features with focus on reliability, iteration speed, and maintainability in early-stage product development. Collaborated on product direction and UX decisions, translating requirements into production-ready implementations.

Senior iOS Engineer at Hooglee Video AI

November 1, 2024 - September 30, 2025

Led 0→1 iOS development from prototype to production, owning architecture, UX decisions, and release pipeline. Built a reusable SwiftUI component system, reducing feature development time by ~30% and enabling faster iteration. Shipped an AI-powered assistant for video selection from the photo library, improving task completion and reducing manual workflow friction. Increased onboarding completion by ~20% by translating user interview insights into targeted UX improvements. Reduced startup latency and memory usage by refactoring critical flows using Swift concurrency. Delivered core product milestones and stabilized initial release prior to transition.

Lead iOS Engineer at Stealth Startup

November 1, 2024 - Present

Owned end-to-end development of a SwiftUI-based mobile app from prototype to production, driving architecture, UX decisions, and release pipeline. Built and standardized a modular SwiftUI component system that accelerated iteration and reduced feature rollout time by 30%. Conducted 10+ user interviews to refine onboarding, improving completion rates by 20%. Implemented analytics and feedback loops to align roadmap decisions with user behavior and engagement data. Optimized performance through Swift concurrency refactors, reducing startup time and memory footprint under real-world usage.

Software Engineer at TikTok

January 1, 2023 - November 1, 2024

Redesigned video-fetching API layer using Go concurrency strategies that reduced API latency by 30% and cut maintenance overhead 50% across a billion-user surface. Modernized a major Objective-C codebase into Swift, removing 20K+ lines of legacy code and establishing a scalable foundation for future product development. Architected and delivered the user-interaction event pipeline powering TikTok's A/B testing platform, enabling data-driven UX changes that boosted session retention by 15%. Shipped core iOS features weekly in collaboration with backend, product, and data teams across three time zones. Strengthened account recovery reliability by integrating password, email, and phone MFA workflows, increasing user recoverability success by 70% globally.

Software Engineer at Tobecon

March 1, 2021 - April 1, 2021

Reduced monthly application maintenance costs by optimizing the number of running EC2 instances according to traffic volume and using spot instances. Mentored a team of five to deploy and maintain an ASP.NET application using AWS Elastic Beanstalk. Integrated a React framework for the frontend layer to utilize reusable custom components. Boosted development productivity by 60% by creating and reusing custom React components and SQL functions.