Vikram Grewal

Senior iOS Developer

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About

Senior iOS Developer with 6+ years of experience building high-performance mobile applications. Currently at OKX, specializing in Swift, iOS architecture, and creating seamless user experiences for millions of users worldwide. Proven track record of delivering critical features, optimizing performance, and mentoring engineering teams.

Education

San Francisco State University Bachelor's Science Computer Science

Experience

OKX
Senior iOS Developer (May 2024 - Present) | iOS Developer (October 2022 - May 2024)
October 2022 - Present
  • Built and shipped standalone OKX Apple Watch app with real-time complications and power-optimized performance
  • Led iOS delivery for critical compliance features enabling expansion into new regulated markets
  • Re-architected core modules with MVVM + optimized data feeds, reducing UI load by ~30%
  • Improved transaction funnel performance (buy/sell/convert), increasing completion rates by 25%
  • Delivered conversion tooling that lifted non-KYC → KYC verification rates by 25% in one quarter
  • Reduced crash rates and improved stability through advanced threading, caching, and performance profiling
  • Led modularization of legacy components, improving build speed and enabling isolated testing
  • Partnered with backend + Android + product teams to unify data models and cross-platform behavior
  • Mentored junior engineers and owned the onshore markets module across teams and timezones
  • Recovered a failing project post-launch and delivered under tight deadlines
Visva
iOS Developer
December 2019 - October 2022
  • Led the development of a robust chat system migration from Twilio to Sendbird, collaborating closely with backend teams to improve architecture and reduce API response times by 20%
  • Designed and implemented a custom video player for feeds using AVFoundation, which increased user engagement by 15%
  • Architected and optimized complex user interfaces using UIKit and Core Animation, ensuring smooth and responsive UI experiences across the app
  • Implemented a tagging system for posts, improving content organization and enhancing user navigation
  • Integrated multiple third-party libraries (Alamofire, Mixpanel, Sendbird) using Cocoapods, maintaining project scalability and efficient dependency management
PIECED
iOS Developer
August 2018 - December 2019
  • Developed and maintained a high-performing iOS application that streamlined customer data management and facilitated seamless order processing through factory REST APIs
  • Engineered network calls to communicate XML data with a remote factory, leveraging a local SQLite database to ensure data integrity and reliability
  • Designed adaptive UI layouts for both iPad and iPhone, ensuring a consistent and user-friendly experience across devices
  • Optimized app performance by utilizing best practices in multithreading and memory management, reducing load times and enhancing user satisfaction