BAYARBAATAR GONCHIGSUREN
About me
Senior iOS Developer with 13+ years of expertise architecting and delivering mission-critical mobile applications. Demonstrated mastery of Swift, Objective-C, and Flutter, specializing in building scalable B2B/B2C solutions that drive business growth. Led distributed engineering teams and established technical standards while mentoring junior developers. Proven track record of successful remote collaboration and project delivery, known for translating complex requirements into elegant, maintainable code and optimizing app performance across the Apple ecosystem.
EDUCATION
TECHNICAL EXPERTISE
Development & Programming
Swift, Objective-C, Dart (Flutter), UIKit, SwiftUI, CocoaTouch
Software Architecture
MVC, MVVM, VIPER architectures
Backend Technologies
Firebase, RealmDB, SQLite, MongoDB, CoreData
Cloud Services & Integration
AWS, Google APIs, MapKit, Facebook SDKs, RevenueCat, AgoraSDK
Development Tools
GitHub, GitLab, Bitbucket, Xcode, Carthage, Cocoapods
Design & UX
Figma, Sketch, Adobe XD
PROFESSIONAL EXPERIENCE
Senior Mobile Developer
Mezorn LLC powers UBCab Holding, Mongolia's largest Uber-like service, offering taxi, delivery, and car solutions for over 1 million users and 50,000 drivers. The platform features seamless payments, real-time tracking, multilingual support, and in-app communication.
- Optimized CoreLocation functionality, fixing distance calculation errors, eliminating duplicate updates, and reducing backend API calls caused by network issues.
- Improved UI responsiveness using SnapKit, NSAutolayout, and SwiftUI, transitioning from outdated storyboard-based designs.
- Resolved critical issues related to notifications, real-time location updates, and incorrect metric data for both Rider and Driver apps.
- Developed iOS native plugins, including Live Activities for dynamic driver matchmaking, arrival states, penalty cost notifications, and displaying driver/car information and trip ratings.
- Collaborated with a mobile development team to enhance existing features and deliver new Flutter app functionalities for both Rider and Driver platforms, meeting tight deadlines.
Senior iOS Developer
Premier on-demand delivery platform in Ulaanbaatar, ranking #1 in Food & Drink (2019-2021) with a 4.8/5 rating and multilingual support.
- Redesigned UI/UX and optimized iOS app performance, leveraging Swift and Objective-C to scale monthly active users from 30K to 150K in a year.
- Led a mobile development team of 4 developers, fostering collaboration between mobile and backend teams to deliver high-quality, scalable solutions.
- Designed and implemented key features including real-time tracking, loyalty programs, and payment systems, significantly improving user experience and engagement.
- Optimized vendor retrieval logic, reducing API response times from 2 seconds to 100ms and cutting Google Maps API costs by 95%.
- Refactored legacy Objective-C codebases, improving maintainability and achieving near crash-free performance through structured models and design patterns.
Mid level iOS Developer
Tokyo-based marketing and technology solutions company delivering B2B platform solutions for high-profile clients like Yahoo Japan and Mitsubishi.
- Developed an iOS app from scratch, migrating from Xamarin, utilizing Core Data, MySQL for offline caching, SDImageCache for storage, and AFNetworking for REST API communication, ensuring seamless backend integration.
- Implemented advanced features including AWS S3 for image uploads, Core Image for real-time rectangle detection, and a swipe-based UX inspired by Apple's Contact app, improving user adoption and engagement.
- Optimized performance by leveraging Core Data and MySQL, reducing update times for 100 name cards to 200ms and scaling to handle 10K name cards in the same timeframe through efficient query execution.
- Enhanced UI/UX design by redesigning screens in Sketch, ensuring consistency across iOS and Android platforms, and introducing intuitive swipe actions for key user interactions (call, message, email, map, favorites).
- Proposed and implemented innovative solutions, such as the Apple-inspired contact detail screen, which streamlined user experience and accelerated platform adoption.
iOS Developer
Tech company developing critical national mobile applications including EzStat, BomStat, TaxStat, and MyParliament for the National Assembly.
- Maintained and enhanced key applications (ezStat, bomStat, taxStat), integrating interactive pie and linear charts, and optimizing functionality for both iPad and iPhone platforms.
- Developed the MyParliament iPad app in collaboration with a backend engineer, implementing WebSocket for real-time attendance and voting, and integrating fingerprint scanners for secure user recognition.
- Utilized AFNetworking to handle SOAP and REST APIs, processing XML and JSON responses and converting them into structured data models for seamless integration.
- Led the end-to-end development of a Groupon-like app, featuring a custom Mongolian keyboard, a Pinterest-inspired layout, and location-based notifications for personalized store deals.
PERSONAL PROJECTS
Gegee – Mindfulness Meditation App
Mongolia's first psychology-based mindfulness meditation app offering free and subscription courses across mental wellness categories.
- Integrated SSO authentication with Apple, Google, and Facebook, enabling seamless and secure user access.
- Enabled Apple Health integration for tracking mindfulness activities, enhancing user engagement and health insights.
- Implemented daily reminders using UNNotification to encourage consistent mindfulness practice and user retention.
- Developed a background/foreground meditation player for uninterrupted sessions, ensuring a smooth user experience.
- Designed intuitive UX/UI using Sketch, including Dark/Light mode support, delivering a visually appealing and user-friendly interface.
ScanMe – Document Scanner
User-friendly document-scanning app providing high-resolution scans for efficient document management.
- Advanced Scanning Features: Enabled automatic and manual scanning with high-resolution capture and batch processing for efficient, professional-quality results.
- Intelligent Document Organization: Implemented auto folder naming using OCR and drag-and-drop reordering for seamless document management.
- Enhanced Image Processing: Integrated advanced filters and editing tools (rotate, crop, modify) to improve image quality and readability.
- Streamlined Workflow: Introduced group actions (share, delete) and re-modification capabilities, allowing users to manage and edit documents post-scanning.
- Clean & Intuitive UI/UX: Designed a user-friendly interface focused on simplicity and ease of use, ensuring a seamless experience for all users.
Lenzy – Snapchat Lens Saver
Social media lens discovery platform enabling users to find, save, and reuse Snapchat lenses, boosting teen creativity globally.
- Curated and delivered a handpicked collection of Snapchat lenses for users to explore and enjoy.
- Enabled users to save lenses directly to the app or try them instantly, enhancing convenience and engagement.
- Simplified user access with seamless authentication for a frictionless experience.
- Integrated advanced features to enhance lens interaction and user functionality.
- Implemented a free and premium subscription model using Apple In-App Purchases and RevenueCat, optimizing revenue management and scalability.
DocScan – OCR Document Scanner
Advanced document scanner utilizing Core Image and Tesseract OCR for fast, reliable paper-to-digital text conversion.
- Core Image processing enhances document quality for clear, high-resolution scans.
- Tesseract OCR integration enables accurate text recognition and extraction.
- Multi-format export supports JPEG, PNG, PDF, and TXT for flexible document saving.
REMOTE UPWORK JOBS
Cranium: Headache Diary
- Implemented PDF export functionality using RxSwift and VIPER architecture
- Developed offline CoreData storage solution with sync capabilities
- Integrated HealthKit for comprehensive health data tracking
- Achieved 4.8/5 client satisfaction rating
RevenueCat Integration
- Successfully migrated StoreKit to RevenueCat
- Implemented Superwall for dynamic paywall management
- Received 4.7/5 client rating
Renticator – Rental Platform
- Developed comprehensive rental network platform
- Integrated multiple payment gateways (Stripe, PayPal)
- Implemented community features and verification system
Logitrips – Car Rental System
- Built peer-to-peer car-sharing marketplace
- Integrated PayPal payments and messaging functionality
- Implemented chat system between customer and driver
AWARDS & RECOGNITION
- Information Technology Leader of Mongolia (2024) - Ministry of Digital Development
- Recognition for Teaching Mobile Development for students after class - MUST
- Featured as 'Best Mindfulness App' by News.mn (Gegee App)
LANGUAGES
English (Fluent)
Mongolian (Native)
Accomplished jobs
Logitrips - Car rental system for travelers
tenPlus - Get 10%+ Discounts on Local Deals
