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Božidar Nikolić

@boidarnikoli

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Senior iOS developer focused on building scalable, maintainable mobile apps and teams.

Serbia

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What I'm looking for

I seek senior mobile roles where I can lead iOS development, improve architecture and CI/CD, mentor teams, and deliver scalable, maintainable products in cross-functional teams.

I am a senior iOS developer and team leader with extensive experience designing, building, and maintaining client-server mobile applications for startups and enterprises. I have led teams, introduced CI/CD, rearchitected apps with modern patterns (MVVM, VIPER, Coordinator), and created modular skeletons and custom frameworks to speed delivery.

My work spans Swift and Objective-C, RXSwift, Realm, socket integrations, and complex third-party API integrations across domains such as fintech/crypto, betting, loyalty, travel, media, and charity. I am results-driven, proactive, and focused on maintainability, performance, and shipping reliable features that match client requirements.

Experience

Work history, roles, and key accomplishments

Current

Senior iOS Developer

Current

Createq

Jan 2022 - Present (3 years 11 months)

Improved existing iOS insurance apps and developed new client-requested features for the Real Garant product line, delivering updates and stability fixes to production releases.

Swift IOS SDK CI CD app store REST APIs Unit Testing Realm Fastlane

Senior iOS Developer

COING

Jul 2021 - Jan 2022 (6 months)

Enhanced Clockify iOS app by adding CI/CD with Fastlane, refactoring network and DB layers, and designing a new architecture to improve maintainability and release velocity.

Swift Realm CI CD Fastlane Networking Architecture MVVM Refactoring

Senior iOS Developer

BetBull

Jan 2021 - Jul 2021 (6 months)

Maintained and developed iOS betting and casino apps for multiple US states, implementing new features, real-time socket updates, and using VIPER and Coordinator patterns.

Swift VIPER Coordinator Sockets IOS SDK

Team Leader, Senior iOS Developer

Magneds

Oct 2017 - Jan 2021 (3 years 3 months)

Led iOS team building modular loyalty apps by decomposing a legacy app into a skeleton with reusable modules, accelerating client-specific app delivery across multiple verticals.

Objective C Swift Architecture Design Patterns Module Development Team Leadership app store

Team Leader, Senior iOS Developer

Prime Software

Aug 2016 - Oct 2017 (1 year 2 months)

Developed and maintained the Lykke crypto trading and wallet app, adding RXSwift-based features and coordinating an 8-person cross-functional team for client-server functionality.

RxSwift Swift MVVM Cryptocurrencies Wallet IOS SDK Team Leadership

Senior iOS Developer

Stanga One1

Nov 2013 - Aug 2016 (2 years 9 months)

Built and integrated multiple iPhone client-server apps (music, travel, dating, business tools) using Objective-C, integrating third-party APIs and frameworks to deliver feature-rich consumer apps.

Objective C IOS SDK Core Data

iOS Developer

Webelinx

Apr 2013 - Nov 2013 (7 months)

Developed offline and universal iOS games and utility apps with multi-language support, in-app purchases, custom animations and ad integrations using Objective-C.

Objective C IOS SDK In App Purchases AdColony Localization

iOS and PHP Developer

Ates International

Apr 2012 - Apr 2013 (1 year)

Developed iPhone client-server apps (Arenoo, joiz) with Facebook integration, push notifications, messaging and multi-language support, and supported iPad app Calc4Print.

Objective C PHP REST APIs JSON Push Notifications Analytics

Education

Degrees, certifications, and relevant coursework

University of Niš, Faculty of Electronic Engineering

Master in Computer Science, Computer Science

2003 - 2011

Activities and societies: Thesis: Expanding the CMS, the comments feature; Projects: PHP+SQL application using Smarty templates; Huffman code file compression in C#.

Completed a Master in Computer Science at the Faculty of Electronic Engineering, University of Niš, with coursework and projects in software development and compression algorithms.