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.

SwiftSwiftUIUIKitObjective-CGolangREST APIsGraphQLMongoDBPostgreSQLDockerProxmoxTrueNASOPNsenseCloudflareGit

Experience

Senior iOS Software Engineer

Tech Mahindra · Client: Citizens Bank

Feb 2025 – Sep 2025 · Remote, Texas
  • Developed iOS features using Swift, SwiftUI, UIKit, and GraphQL for Citizens Bank.
  • Built modular SwiftUI screens, optimized GraphQL queries and mutations, and contributed to architecture and package migrations.
  • Reviewed pull requests, supported Jenkins CI/CD pipelines, and collaborated with product and design teams using Figma.

Senior iOS Software Engineer

Bank of America

Oct 2022 – Apr 2024 · Hybrid, Plano, TX
  • Developed production iOS features using Swift, UIKit, and Objective-C for Bank of America's mobile banking application.
  • Contributed to the Claim Status feature, improving customer visibility while helping reduce annual operational costs by approximately $12 million.
  • Built XCTest unit and UI tests for REST APIs, CMS content, and business logic while maintaining accessibility and ADA compliance.

iOS Software Engineer

Perfict Global Inc.

Nov 2021 – Sep 2022 · Remote, Texas
  • Developed native iOS features for Amazon Glow and the Capital One mobile application using Swift, SwiftUI, UIKit, and MVVM.
  • Implemented StoreKit-based in-app purchases for Amazon Glow and integrated secure REST APIs for customer-facing mobile features.
  • Collaborated with cross-functional teams through Agile development, code reviews, automated testing, and production releases.

iOS Software Engineer

MoneyGram Inc.

Jan 2021 – Nov 2021 · Remote, Plano, TX
  • Developed and maintained native iOS features using Swift, Xcode, Interface Builder, Instruments, and CocoaPods.
  • Implemented an iOS Widget, improved application performance, and resolved critical production issues.
  • Worked closely with QA, debugged network traffic with Charles Proxy, and researched and prototyped new product features.

iOS Software Engineer

Citibank

Mar 2020 – Jan 2021 · Remote, Irving, TX
  • Developed and tested features for Citi's iOS mobile banking application using Swift and Apple development frameworks.
  • Applied TDD practices and built UI and integration tests using XCTest and Appium.
  • Collaborated with engineering and business stakeholders to deliver new features and present technical solutions.

Education

Bachelor's & Master's Equivalent Education

Applied Computer Science

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