Kolle Arunkumar

iOS Developer with 2 years of professional experience building and maintaining native iOS applications using Swift and UIKit for an enterprise POS and billing product used by real businesses. Strong hands-on experience with MVC architecture, RESTful API integration, offline-first data storage (SQLite), multithreading, and performance optimization, backed by a consistent record of debugging production issues using Xcode Instruments. Have conceptual understanding of SwiftUI, MVVM, and Core Data, currently building hands-on proficiency through self-directed learning.

Fast, independent learner who has also built full-stack web applications (Java, Spring Boot, React.js) outside of core work. Immediate joiner, based in Hyderabad.

Associate Software Developer (iOS) - Effiasoft Pvt. Ltd. - Hyderabad, India

(2024-06 - 2026-06)

JustBilling — Enterprise POS & Billing Application (iOS)

• Developed and maintained native iOS features end-to-end using Swift and UIKit across billing, inventory, purchases, sales, customer management, loyalty, and invoicing modules.
• Optimized application performance across 20+ production screens by removing redundant database queries and refactoring rendering logic, cutting load times on large datasets from 30+ seconds to under 2-3 seconds.
• Implemented pagination for product catalogs of 10,000+ items, improving scroll performance and reducing memory usage.
• Designed SQLite table schemas and views, and wrote queries and joins to support offline-first sync between local storage and backend services.
• Integrated RESTful APIs through reusable service layers, handling JSON parsing, authentication, and error handling.
• Used Grand Central Dispatch (GCD) to move heavy data operations off the main thread, keeping the UI responsive during batch sync and catalog loading.
• Diagnosed and resolved crashes, memory leaks, sync failures, and API errors through root-cause analysis using Xcode Instruments.
• Implemented video playback functionality using AVFoundation, and integrated Core Location for location-based features.
• Implemented Marketplace KYC document upload and thermal printer support for invoice printing.
• Contributed to Arabic localization (RTL support), automating string extraction from Storyboards.
• Thoroughly manually tested each assigned feature against documented scenarios prior to release.
• Contributed shared networking and business-logic modules to Kotlin Multiplatform Mobile (KMM) projects spanning Android and iOS.
• Maintained code quality using SwiftLint and SwiftFormat, and used Git for version control within an Agile team.

B.E. - Computer Science - Vasavi College of Engineering (2020 - 2024)