Hello! 👋

I'm Janserik Suinbai

Senior iOS & Backend Engineer

Janserik Suinbai portrait

About Me

I'm a Senior Software Engineer with more than eight years of experience building native iOS applications and backend services. My primary expertise is Swift, SwiftUI, UIKit, and Objective-C, complemented by backend development in Golang. Throughout my career, I've worked on enterprise and consumer products across banking, fintech, e-commerce, and mobile platforms. Outside of work, I enjoy building personal products and maintaining a homelab environment based on Proxmox, TrueNAS, OPNsense, Docker, and 10Gb networking, where I explore infrastructure, cloud-native technologies, and AI.

Swift SwiftUI UIKit Objective-C Golang REST APIs GraphQL MongoDB PostgreSQL Docker Proxmox TrueNAS OPNsense Cloudflare Git

Experience

iOS Software Engineer · Founder / Owner

BonMenu | LockNotes

Sep 2025 – Present · USA
  • Rebuilt BonMenu's legacy Objective-C/UIKit app in Swift and SwiftUI while preserving its offline-first backend API.
  • Built a 15+ entity Core Data sync layer, cursor pagination, concurrent image caching, authentication, and three-language localization.
  • Created LockNotes for iOS, iPadOS, and macOS with SwiftUI, SwiftData, CloudKit, biometric/passcode security, Keychain storage, and automatic re-locking.

iOS Software Engineer

Citizens Bank

Feb 2025 – Sep 2025 · Remote, Texas
  • Built modular SwiftUI screens and integrated efficient GraphQL queries and mutations.
  • Supported architecture and package migrations, pull-request reviews, and Jenkins CI/CD.
  • Partnered with designers in Figma to deliver consistent, user-focused experiences.

iOS Software Engineer

Bank of America

Oct 2022 – Apr 2024 · Hybrid, Plano, TX
  • Developed Swift, UIKit, and Objective-C features, including Claim Status, which helped reduce annual operational costs by approximately $12 million.
  • Built unit and UI tests for REST APIs, CMS content, and business logic while maintaining ADA accessibility.
  • Collaborated across iOS, Android, QA, and design teams.

iOS Software Engineer

Perfict Global Inc.

Nov 2021 – Sep 2022 · Remote, Texas
  • Built Swift, SwiftUI, and UIKit features for Amazon Glow and the Capital One app using MVVM.
  • Implemented StoreKit purchases and secure REST API integrations.
  • Contributed to Agile development, code reviews, testing, and production releases.

iOS Software Engineer

MoneyGram Inc.

Jan 2021 – Nov 2021 · Remote, Plano, TX
  • Developed native iOS features, including a Widget, using Swift and Apple development tools.
  • Improved performance, fixed critical bugs, and debugged network responses with Charles Proxy.
  • Partnered with QA and documented feature prototypes in Confluence.

iOS Software Engineer

Citibank

Mar 2020 – Jan 2021 · Remote, Irving, TX
  • Applied TDD and BDD practices to iOS development and Java-based testing workflows.
  • Built UI and integration tests with XCTest and Appium.
  • Delivered new features and presented solutions to stakeholders.

Education

M.S. Computer Science (OMSCS)

Georgia Institute of Technology

2024 - Present
  • Specialization in Computing Systems.
  • Advanced coursework in distributed systems, networking, and software engineering.

Bachelor's & Master's Equivalent Education

Applied Computer Science

  • Academic foundation in software engineering and computer science.
  • Focused on algorithms, programming, and system design.