Oscar Eduardo Sierra Zúñiga

Lead iOS Developer at Nisum Colombia

Close collaboration with a Chilean client for external framework integration; development of phone number transfer functionality; complete integration process management using Swift and Swift Package Manager; stakeholder coordination; technical leadership in implementing innovative solutions; supervision of the process through final deployment to end users.

Senior iOS Developer at Mercado Libre

Led critical project migration from Objective-C to Swift 4.5; meticulous planning, coding, and testing for a smooth transition; implementation of new features based on user feedback and market trends; delivery of complex projects on time with high quality; continuous improvement of existing modules.

Senior iOS Developer at Globant

Led the initiation of a banking project from concept; defined core project elements: programming language, initial configurations, CI integrations; development of key modules: Home, Login, Profile, Document Reading; implemented VIPER architecture for scalability; collaboration with a 3-person iOS development team; research and analysis for informed decision-making.

Senior iOS Developer at Logistics App

Led in the development of unit-based geolocation features; real-time location tracking data implementation; creation of interactive maps, status updates, and notifications; direct collaboration with clients to understand specific tracking needs; robust system for logistics industry demands.

Junior iOS Developer → Senior iOS Developer at Inversiones Centro Hotel

Selected based on academic performance for hotel app development; real-time event and tour information integration; map and location-based content personalization; development of alert processes based on user-configured settings; cross-functional collaboration with development and design teams; active participation in product planning and review meetings.

Senior iOS Developer at Tok All

Led Unity framework for 3D geolocation-based navigation; localization management for user location-based content personalization; development of alert processes based on user-configured settings; cross-functional collaboration with development and design teams; active participation in product planning and review meetings.

Lead iOS Developer at Nisum Colombia

Remote role: Led iOS development for Nisum Colombia. Collaborated with a Chilean client for external framework integration; developed phone number transfer functionality; managed the integration process using Swift and Swift Package Manager; coordinated with stakeholders to gather requirements and provide progress updates; provided technical leadership and supervised deployment to end users.

Senior iOS Developer at Mercado Libre

Remote role: Led critical project migration from Objective-C to Swift 4.5; planned, refactored, and tested for a smooth transition; implemented features based on user feedback and market trends; delivered complex projects on time with high quality; continuous improvement of existing modules.

Senior iOS Developer at Tock All

Technology / Augmented Reality. Led the initiation of a banking project from concept; development included integrating Unity framework for 3D geolocation-based navigation; localization management for user location-based content personalization; alert processes based on user-configured settings; cross-functional collaboration with development and design teams; active participation in product planning and review meetings.

Senior iOS Developer at Logistic App

Technology / Augmented Reality. Main activities: integration of Unity framework for 3D geolocation-based navigation; localization management for user location-based content personalization; development of alert processes based on user-configured settings; cross-functional collaboration with development and design teams; active participation in product planning and review meetings.

Junior iOS Developer at Inversiones Centro Hotel

Hospitality and Tourism. Selected based on academic performance for hotel app development; development of an app for real-time event and tour information; integration of mapping functionalities (Waze, Google Maps); cross-disciplinary collaboration; focus on usability and effectiveness for hotel guests.

Lead iOS Developer at Nisum Colombia

Remote collaboration with a Chilean client for external framework integration; developed phone number transfer functionality; managed end-to-end integration using Swift and Swift Package Manager; coordinated requirements and progress updates with stakeholders; provided technical leadership and supervised final deployment to end users.

Senior iOS Developer at Mercado Libre

Led critical project migrating the Question module from Objective-C to Swift 4.5; conducted planning, refactoring and testing for a smooth transition; implemented new features based on user feedback and market trends; ensured on-time delivery with high quality and continuous improvement of existing modules.

Senior iOS Developer at Globant

Led the initiation of a banking project from concept; defined core project elements (programming language, initial configurations, CI integrations); developed key modules (Home, Login, Profile, Document Reading); implemented VIPER architecture for scalability and maintainability; collaborated with a 3-person iOS team and conducted research for informed decision making.

Senior iOS Developer at Tok All

Integrated Unity framework for 3D geolocation-based navigation; managed localization for user-location-based content personalization; developed alert processes based on user-configured settings; cross-functional collaboration with clients and dev teams; actively participated in product planning and reviews.

Junior iOS Developer at Inversiones Centro Hotel

Selected based on academic performance for hotel app development; developed an app for real-time event and tour information; integrated mapping functionalities (Waze, Google Maps); fostered cross-disciplinary collaboration; focused on usability and effectiveness for hotel guests.

Lead iOS Developer at Nisum Colombia

Close collaboration with Chilean client for external framework integration; development of phone number transfer functionality; complete integration process management using Swift and Swift Package Manager; stakeholder coordination for requirements gathering and progress updates; technical leadership in implementing innovative solutions; supervision of process through final deployment to end users.

Senior iOS Developer at Mercado Libre

Led critical migration of Question module from Objective-C to Swift 4.5; meticulous planning, code refactoring, and testing for smooth transition; implemented new features based on user feedback and market trends; ensured delivery of complex projects on time with high quality; ongoing improvements of existing modules.

Senior iOS Developer at Globant

Led iOS development efforts in a remote team; architecture planning and feature delivery for multiple modules; collaboration with cross-functional teams to ensure product alignment and quality.

Senior iOS Developer at Tok All

Led integration efforts for AR/3D-related features; planning and delivering features with Unity-based navigation and geo-location content; cross-functional collaboration for product planning and reviews; contributed to real-time tracking and alert systems.

Junior iOS Developer → Senior iOS Developer at Inversiones Centro Hotel

Selected based on academic performance for hotel app development; development of an app for real-time event and tour information; integration of map pinning functionalities (Waze, Google Maps); cross-functional collaboration with design and development teams; contributed to defining core project elements: programming language, initial configurations, CI integrations; development of key modules: Home, Login, Profile, Document Reading; VIPER architecture for scalability and maintainability; collaboration with three-member iOS development team; involved in product planning and reviews.

Lead iOS Developer at Nisum Colombia

Led collaboration with a Chilean client for external framework integration; developed phone-number transfer functionality; managed integration processes using Swift and Swift Package Manager; coordinated requirements gathering and progress updates with stakeholders; provided technical leadership and supervised final deployment to end users.

Senior iOS Developer at Mercado Libre

Led migration of the Question module from Objective-C to Swift 4.5; performed meticulous planning, code refactoring, and testing for a smooth transition; implemented new features based on user feedback and market trends; delivered complex projects on time with high quality; continuously improved existing modules.

Senior iOS Developer at Globant

Led the initiation of a banking project from concept; defined core project elements (programming language, initial configurations, CI integrations); developed key modules (Home, Login, Profile, Document Reading); implemented VIPER architecture for scalability and maintainability; collaborated with a 3-member iOS team; participated in product planning and review meetings.

Senior iOS Developer at Tock All

Integrated Unity framework for 3D geolocation-based navigation; localized content management for user location-based personalization; developed alert processes based on user-configured settings; cross-functional collaboration with design and development teams; active participation in product planning and review meetings.