Walter – iOS, SwiftUI, iOS SDK

The client is a mobile app company making a variety of B2C apps, serving the global tattoo enthusiast market. The application revolutionizes the tattoo decision-making process by enabling users to virtually preview how tattoos will look on their actual body using their smartphone camera before committing to permanent ink.

• Architected and developed a complete SwiftUI-based solution from the ground up, designing a modular architecture with clear separation between the AR processing layer, business logic, and presentation components while maintaining interoperability with the existing Objective-C AR codebase;
• Designed and implemented intuitive gesture-based controls allowing users to resize, rotate, and precisely position tattoo designs on their body using pinch, pan, and rotation gestures;
• Leveraged existing Objective-C AR foundation codebase, creating a Swift-Objective-C bridging layer, implementing wrapper protocols and adapters, ensuring seamless integration while modernizing user-facing features;
• Integrated camera capture functionality allowing users to save AR preview photos and videos for sharing with friends, family, and tattoo artists before making final decisions;
• Built an analytics tracking system monitoring feature usage, AR session duration, conversion rates (preview to actual tattoo), and user retention, informing product roadmap prioritization.

A bank is developing a Fintech mobile app for end-users, aimed at making transfers and banking services easily accessible on smartphones.

• Built pixel-perfect UI components matching Figma design specifications with 100% accuracy, collaborating closely with UX/UI designers to ensure optimal user experience across different device sizes;
• Added tests with coverage 90% through the implementation of comprehensive unit tests, UI tests, and integration tests using the XCTest framework;
• Identified and resolved a critical security vulnerability at registration;
• Collaborated in an Agile Scrum environment with a cross-functional team including backend developers, QA engineers, product owners, and security specialists across Saudi Arabia, South Africa, and the UK.

The client is an enterprise identity verification technology provider serving major banking institutions, cryptocurrency exchanges, and fintech companies across Europe and globally.

• Refactored a legacy codebase, removing unsafe memory management patterns and force unwrapping practices;
• Improved overall type safety throughout the codebase;
• Maintained backward compatibility while adding new features;
• Ensured seamless updates for existing client integrations

The client is a Romanian e-commerce company operating in the online retail market, serving 100.000 active customers across Romania with an annual revenue of over a billion $. The project was delivered through a software development agency engagement, focusing on building a modern mobile shopping experience to compete with major e-commerce platforms in the Romanian market.

• Designed and implemented end-to-end shopping flow, including product catalog browsing, search with real-time filtering, shopping cart management with price calculations, and multi-step checkout process;
• Built reactive UI components using the Combine framework and SwiftUI/UIKit, implementing declarative data binding, reducing boilerplate code, and improving UI responsiveness;
• Implemented MVVM-C architecture pattern, establishing clear separation between business logic, presentation layer, and navigation coordination, improving code testability and maintainability;
• Participated in rigorous code review process ensuring adherence to their established architectural guidelines, Swift style guide, and readability standards;
• Collaborated with agency team, including Android developers, backend engineers, and QA team, in an Agile environment, participating in daily standups and sprint planning sessions;
• Delivered rapid iterative development, completing MVP in 12 weeks while maintaining high code quality standards and passing all client acceptance criteria.

A company developing a booking and discovery system for restaurants, designed to increase customer engagement and reduce no-shows.

• Led feature definition and prioritization sessions alongside the CEO and development team, translating business requirements into technical specifications and user stories;
• Designed and implemented end-to-end restaurant booking flow, including restaurant search with map-based discovery, real-time availability checking, reservation confirmation with calendar integration, and booking modification capabilities;
• Implemented push notification system for booking reminders, promotional offers, and restaurant updates;
• Successfully launched production version serving the Romanian market

The project involved creating custom software solutions for clients, delivering tailored IT services to address unique business challenges, and improving operational efficiency.

• Developed and delivered 4 mobile applications using React Native, Objective-C, and Java;
• Collaborated with cross-functional teams to implement features and fix bugs efficiently;
• Maintained code quality through reviews, testing, and adherence to best practices;
• Ensured timely delivery of projects while meeting client requirements and expectations.

A specialized music streaming startup targeting the audiophile market, differentiating from mainstream services (Spotify, Apple Music) by offering lossless hi-res audio formats (FLAC, ALAC, DSD) with bit-depths up to 24-bit and sample rates up to 192kHz. The platform serves a niche market of subscribers who prioritize audio quality over convenience, managing a catalog of potentially hundreds of hi-res albums from independent labels and audiophile-focused content providers.

• Worked directly with the CEO and beta user community, conducting feature prioritization workshops and gathering detailed technical requirements specific to hi-res audio playback needs;
• Designed and implemented a custom audio playback engine using AVFoundation and bass24 frameworks, supporting lossless formats (FLAC, ALAC, DSD) with bit-perfect output to external DACs via Lightning/USB connection;
• Built an advanced offline caching system for hi-res audio files, managing local storage efficiently, implementing smart cache policies based on user listening patterns and available storage capacity;
• Optimized music library loading mechanisms handling catalogs with 10,000+ albums, implementing efficient Core Data queries, background loading, and incremental UI updates, reducing library load time and keeping the app usable.

An innovative sports technology startup company developing automated video recording and intelligent editing solutions for sporting events, initially ski and expanding to running and cycling events. The platform aims to eliminate manual camera operation needs, providing automated tracking and recording of sporting activities for athletes, coaches, and parents.

• Built a comprehensive video playback interface with frame-accurate seeking, variable playback speeds (0.25x to 2x), and multi-angle viewing for games recorded with multiple cameras;
• Provided on-site technical support at a ski resort for debugging complex video recording issues including synchronization problems, network latency impacts, and hardware integration edge cases;
• Developed video sharing and social features allowing athletes to share highlights directly to social media platforms (Instagram, Facebook, YouTube) with custom branding and watermarking capabilities;
• Contributed to a spin-off project that won 1st prize at the International Exhibition of Inventions of Geneva 2014, validating an innovative approach to automated sports recording technology.