Cosmin is available for hire

Cosmin Anghel

Verified Expert in Engineering

iOS Developer

Location

Zürich, Switzerland

Toptal Member Since

August 24, 2022

Cosmin is a senior software engineer with six years of experience in the social media, healthcare, education, and eCommerce industries. He excels at setting up projects from scratch and designing, developing, deploying, and maintaining them. Cosmin is detail-oriented and passionate about building high-quality products.

Algorithms API Design Full-stack Development Full-stack Web Development App Store Git REST APIs iOS JavaScript Node.js GitHub Swift API Development TypeScript Apple Watch Apple

Portfolio

Ego & ID LLC

Swift, iOS, Google Cloud Platform (GCP), UIKit, APIs, GitHub, Go, Full-stack...

Freelance

Swift, iOS, MapKit, Unity, In-app Purchases, SnapKit, Memory Leaks...

NAL-NAYLILLY Inc

iOS, Swift, Google Cloud Platform (GCP), PostgreSQL, Xcode...

Experience

REST APIs - 6 years Node.js - 5 years iOS - 5 years Swift - 5 years JavaScript - 5 years Full-stack Development - 4 years Mobile App Development - 4 years SwiftUI - 3 years

Availability

Part-time

Preferred Environment

iOS, Swift, Git, Xcode, Mobile App Development, Full-stack Development, SwiftUI

The most amazing...

...project I've worked on is an iOS social media app similar to TikTok, where users can capture NFTs and create AR videos with them.

Work Experience

Senior Full-stack iOS Engineer

2022 - PRESENT

Ego & ID LLC

Developed an iOS app and back end for a Chicago mental health and wellness startup.
Implemented a subscription-based model for access to application content.
Worked on improving the application reviews by integrating a satisfaction level system, which increased the number of positive reviews by 30%.
Implemented iOS widgets, one of the most requested features, which increased the conversion rate by 18%.
Created an admin panel to manage the content displayed in the app easily.

Technologies: Swift, iOS, Google Cloud Platform (GCP), UIKit, APIs, GitHub, Go, Full-stack, Full-stack Development, SwiftUI, Widgets, Next.js, HTML, CSS, Tailwind CSS, SendGrid API, iOS Animations, Testing, Git, TypeScript

Senior Full-stack iOS Engineer

2020 - PRESENT

Freelance

Integrated in-app purchases and contributed to the implementation of NFT.
Improved the application performance and memory usage by two times, fixing memory leaks, optimizing clustering algorithms, and reducing the number of requests. I also implemented animations and redesigned screens.
Built and released an iOS application from scratch with integrated Unity for 3D interactions and animation.
Developed and released an iOS application using Swift. It helps people find therapists using MapKit, chat with a chatbot, make appointments, do homework, and track their moods.

Technologies: Swift, iOS, MapKit, Unity, In-app Purchases, SnapKit, Memory Leaks, Google Maps SDK, Figma, Firebase, Firebase Analytics, GitHub, Fastlane, Git, RealmSwift, Realm, Google Analytics, Async/Await, Xcode, API Integration, SQL, Object-relational Mapping (ORM), JSON Web Tokens (JWT), Vercel, JSON, Full-stack Development, Mobile App Development, Data Structures, Algorithms, JavaScript, Node.js, TypeScript, REST, PostgreSQL, Prisma, HTML, CSS, Tailwind CSS, Push Notifications, Apple Push Notifications, React Native, Databases, API Design, API Development, APIs, User Interface (UI), User Experience (UX), Amazon Web Services (AWS), Express.js, Front-end, Amazon S3 (AWS S3), Apple, App Store, Animation, CocoaPods, SQLite, Mobile, Mobile Apps, Mobile Applications, Apple Watch, Web Development, Mobile Development, Architecture, SwiftUI, Testing, Expo

Senior Full-stack iOS Engineer

2022 - 2022

NAL-NAYLILLY Inc

Developed an iOS app and back end where mentors and mentees can connect with each other.
Implemented an admin role that can manage different aspects of the app.
Worked on onboarding different clients to the app.

Technologies: iOS, Swift, Google Cloud Platform (GCP), PostgreSQL, Xcode, Full-stack Development, UIKit, Go, REST APIs, APIs, SwiftUI, Git, TypeScript

iOS Software Engineer

2022 - 2022

Sonova

Worked on the myPhonak iOS application using Swift, SwiftUI, and Combine.
Saved around five hours of development time per week by integrating Hot Reloading for SwiftUI.
Improved the application UI tests by integrating snapshot testing.

Technologies: Swift, SwiftUI, Testing, UI Testing, Fastlane, CI/CD Pipelines, iOS, GitHub, Git, Xcode, API Integration, JSON Web Tokens (JWT), JSON, Mobile App Development, Data Structures, Algorithms, REST, Figma, Firebase Analytics, Push Notifications, Apple Push Notifications, APIs, User Interface (UI), User Experience (UX), Apple, App Store, Animation, CocoaPods, Mobile, Mobile Apps, Mobile Applications, Mobile Development, Architecture, TypeScript

iOS Software Engineer

2019 - 2022

Tremend

Led the development of two different iOS applications.
Contributed to more than ten projects for different clients worldwide using Swift, SwiftUI, Combine, and REST APIs.
Automated the application distribution process using Fastlane and saved around 25 minutes for each build.
Mentored an intern and helped him with explanations, resources, and code reviews.

Technologies: Swift, iOS, REST, Fastlane, SnapKit, CI/CD Pipelines, Widgets, GitHub, Git, Xcode, API Integration, Mobile App Development, Data Structures, Algorithms, Figma, Firebase Analytics, Push Notifications, Apple Push Notifications, React Native, API Design, APIs, User Interface (UI), User Experience (UX), JSON, JSON Web Tokens (JWT), Apple, App Store, Animation, CocoaPods, SQLite, Mobile, Mobile Apps, Mobile Applications, Mobile Development, Architecture, SwiftUI, TypeScript

Full-stack Engineer

2018 - 2019

Mondly

Increased the revenue by more than 10% by analyzing different A/B tests.
Developed an analytics tool for big data interpretation and graphical representation using Django, Vue, and MongoDB.
Enhanced the onboarding completion rate by more than 30% by creating an analysis for each of the 22 steps.

Technologies: Python, Django, Vue, MongoDB, JavaScript, GitHub, Node.js, Git, APIs, REST APIs, API Integration, Full-stack, HTML, CSS, JSON Web Tokens (JWT), JSON, Full-stack Development, SQL, Object-relational Mapping (ORM), Data Structures, Algorithms, REST, PostgreSQL, Databases, API Design, API Development, User Interface (UI), User Experience (UX), Express.js, Front-end, NoSQL, A/B Testing, Web Development, Architecture, TypeScript

Full-stack Engineer

2017 - 2018

DevSpace Hub

Developed a marketplace app where companies can add their products and users can buy and pay for them directly on the website.
Configured Linux servers to run multiple Laravel websites without struggling.
Integrated Stripe Checkout to make the payments fast and easy from the users' perspective.

Technologies: API Design, API Development, REST, REST APIs, Laravel, Vue, PHP, HTML, CSS, Web Development, Linux, Servers, Full-stack, Full-stack Development, Stripe, Stripe API, Stripe Checkout, MySQL, API Integration, JavaScript, JSON Web Tokens (JWT), JSON, SQL, Object-relational Mapping (ORM), Data Structures, Algorithms, Node.js, GitHub, Git, PostgreSQL, Databases, APIs, User Interface (UI), User Experience (UX), Express.js, Front-end, TypeScript

Experience

Habit Tracking and Wellness iOS App

https://apps.apple.com/app/id1517128447

• Created a Swift-based iOS app to track habits and improve mental health.

• Implemented a subscription-based model for access to application content.

• Worked on improving the application reviews by integrating a satisfaction level system, which increased the number of positive reviews by 30%.

• Implemented iOS widgets, one of the most requested features, which increased the conversion rate by 18%.

• Created an admin panel to manage the content displayed in the app easily.

Relationship iOS App

https://CoupleJoyApp.com

Built a Swift-based app for couples to keep track of their memories easily. Users can create memories with photos, dates, and locations and visualize them on a map for a better experience. I was the only person working on this project, so I designed, implemented, and deployed the project to the App Store.

Social Media iOS App

https://apps.apple.com/us/app/id1508278194

Integrated in-app purchases, contributed to implementing NFTs, optimized the Google Maps clustering algorithm, implemented animations, and redesigned screens for a Swift-based social media app. The app is focused on augmented reality and video creation. I worked with three other iOS engineers on this project and improved the application performance twofold by fixing memory leaks and reducing the number of requests.

Fitness iOS App

https://apps.apple.com/us/app/id1408551433

Handled the development of a Swift-based iOS app focused on achieving fitness goals. I implemented the profile creation flow, an interactive way for users to select the muscles they want to work on, a workout profile, and some animations.

Mentorship Matching iOS App

https://apps.apple.com/us/app/id1626345484

Developed an iOS app and the back end where mentors and mentees can connect. I implemented an admin role that could manage different aspects of the app and worked on onboarding other clients to the app.

Therapy iOS App

https://apps.apple.com/ro/app/id1540333148

Helped users find nearby therapists by creating a Swift-based app with a map feature showing their locations. I was the only person working on this project and implemented the Apple sign-in feature, profile creation, push notifications, and animations.

Solar Power Management iOS App

https://apps.apple.com/au/app/id1214379808

Collaborated with another developer for two years on a Swift-based iOS app that provided detailed information about the solar-based power system. I focused on creating charts, making the UI and iOS widgets, and improving the overall app performance.

Exercise Tracking iOS App

https://twitter.com/cosmincodes/status/1537795669729202179?s=20

Delivered and singlehandedly developed a Swift-based iOS app focused on tracking exercise repetitions. The app can recognize the exercise name, count the number of repetitions, and conduct real-time body tracking. It only counts when the exercise is done correctly and has a workout creation feature.

Hydration iOS App

https://apps.apple.com/us/app/id1535045825?platform=iphone

Enabled users to keep track of their hydration levels by creating a Swift-based iOS and Apple Watch application. The app uses push notifications to remind users to drink water and syncs all data with Apple Health. I designed, implemented, and published the application in the App Store, reaching over 20,000 downloads, a 4.5 rating, and over 100 reviews.

Website Builder

https://notico.app

Developed a platform that helps people create websites without coding, with a no-code tool directly in the Notion app. I made everything single-handedly, including a feature that converts a Notion page to React components using the Notion API and a Next.js incremental static regeneration. This feature provides the best SEO score and performance while keeping the site content dynamic. The website also automatically syncs with the Notion page every few seconds.

App users can change site style directly from the dashboard without coding, edit their website on the go using the fully responsive dashboard, and write custom JavaScript and CSS code. They can also add a custom domain and Google Analytics to their website.

Social Networking iOS App

https://thoughtworld.com

Owned the process of creating a Swift-based social networking app that was focused on 3D interactions available on iPhones and iPads. I was the project's sole developer, integrated Unity into the native iOS app, and created the communication channel between the iOS and Unity apps. I also implemented all animations, focused on the app's performance, and deployed it to the App Store.

Task Management iOS App

Implemented, designed, and released the app to the App Store while being its sole contributor. This Swift-based iOS app with a TypeScript back-end solution helps users complete more tasks and feel rewarded.

Music Player iOS App

Developed a Swift-based iOS app that lets users upload music, create playlists, and listen to songs. I was the project's sole contributor, implementing the application UI, background playing, lock screen app control, song uploading, and playlist and profile creation.

Delivery Management iOS App

Programmed a Swift-based iOS app that connects sellers with buyers. I worked on the project by myself and implemented features including package location tracking, in-app chatting between buyers and sellers using Firebase, shop creation, and adding items to the shop with images and push notifications.

Pomodoro Timer watchOS App

Created a Swift-based watchOS app to track Pomodoro sessions and built a watchOS complication to track current sessions from the home screen. The app is synched with a companion iOS app through WatchKit communication.

Raspberry Pi Robot

Created a Raspberry Pi robot capable of following objects using an integrated camera. I was the only person working on this project and developed key features, such as object detection and recognition, object following, and remote control using a React Native app.

App Analytics Dashboard

Contributed to creating a web-based dashboard used to track and display custom mobile app events. I collaborated with my team and worked on key features, including A/B testing, visualization, cohort charts, and user journey and subscription tracking.

Skills

Languages

JavaScript, Swift, TypeScript, HTML, CSS, SQL, Python, PHP, Go, Objective-C, Dart

Frameworks

SwiftUI, MapKit, Express.js, UIKit, RealmSwift, JSON Web Tokens (JWT), WatchKit, NestJS, Tailwind CSS, React Native, Django, Unity, Svelte, ARKit, Unity3D, Next.js, Laravel, Core ML

Libraries/APIs

Node.js, SnapKit, REST APIs, API Development, CocoaPods, Google Maps SDK, React, HealthKit, Vue, PromiseKit, OpenCV, Stripe, Stripe API, Google Maps API, Google Places API, SendGrid API

Tools

GitHub, Git, Figma, Prisma, Apple Push Notifications, Fastlane, Apple HealthKit, Firebase Analytics, Expo, Docker Compose, Google Analytics, Stripe Checkout, Google Places SDK, Xcode, Amazon Simple Email Service (SES)

Paradigms

REST, Object-relational Mapping (ORM), Mobile Development, Testing

Platforms

iOS, Apple, Mobile, DigitalOcean, Firebase, WatchOS, Visual Studio Code (VS Code), Vercel, Apple Watch, Docker, Droplets, Raspberry Pi, Linux, Amazon Web Services (AWS), Google Cloud Platform (GCP)

Storage

Databases, Realm, PostgreSQL, MySQL, Amazon S3 (AWS S3), SQLite, MongoDB, JSON, NoSQL

Other

Data Structures, Algorithms, In-app Purchases, Push Notifications, Full-stack, Web Development, Full-stack Development, API Design, APIs, Mobile App Development, API Integration, App Store, Mobile Apps, Mobile Applications, Widgets, Servers, Async/Await, Web App Development, Front-end, Animation, A/B Testing, Architecture, Operating Systems, Image Processing, Networking, Cloud Computing, Recommendation Systems, Memory Leaks, UI Testing, CI/CD Pipelines, Firebase Hosting, Augmented Reality (AR), Background Jobs, Vision Framework, Containers, Containerization, User Interface (UI), User Experience (UX), iOS Animations

Education

2018 - 2020

Master's Degree in Computer Science

Politehnica University of Bucharest - Bucharest, Romania

2015 - 2018

Bachelor's Degree in Computer Science

Transilvania University of Brasov - Brasov, Romania

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring