Marius Gutoi, Developer in Benicàssim, Spain
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Marius Gutoi

Verified Expert  in Engineering

Senior iOS Developer

Benicàssim, Spain
Toptal Member Since
April 16, 2021

Marius is a seasoned mobile developer with several years of hands-on experience, focused mostly on iOS (Swift and RxSwift). He's occupied several roles (co-founder and senior iOS developer). He has a demonstrated project history of delivering quality apps, including social apps for a range of interests, and home automation, among others. Marius loves to apply his knowledge in different domains and prove that technology can improve anyone's life.


AppStack SRL
Swift, RxSwift, iOS, Firebase iOS SDK, Dart, Flutter
Fooder Ltd
Parse Server, AWS Elastic Beanstalk, Amazon S3 (AWS S3), Swift, Objective-C...
Baze Labs
Swift, Moya, Realm, iOS




Preferred Environment

MacOS, Xcode

The most amazing... I've developed is Wonderfood. It is a social app for food lovers. A recent app that I've developed is DigiCatch, an app that aggregates fishing data.

Work Experience

Co-founder | Senior iOS Developer

2019 - PRESENT
AppStack SRL
  • Co-founded this company with a mission of providing high-quality, clean, and reliable codebases for iOS and Android mobile applications.
  • Evaluated the business requirements, made proposals containing wireframes and effort estimations, and developed iOS applications.
  • Developed an application that aggregates fishing data and allows fishermen to easily manage their fishing equipment.
  • Built a social app that helped a political party to convey the latest information to their supporters.
Technologies: Swift, RxSwift, iOS, Firebase iOS SDK, Dart, Flutter

Co-founder | Senior iOS Developer

2017 - 2020
Fooder Ltd
  • Co-founded this company and took part in all crucial project decisions, including Wonderfood.
  • Worked as one of the two developers that built an iOS app and its back end (Parse Server).
  • Added analytics events/data to better understand the user behavior and maximize the conversion rate.
Technologies: Parse Server, AWS Elastic Beanstalk, Amazon S3 (AWS S3), Swift, Objective-C, iOS, Firebase iOS SDK

Senior iOS Developer

2017 - 2018
Baze Labs
  • Implemented different UI flows and performed some fancy animations.
  • Developed a network layer (Moya) and persistence layer (Realm).
  • Handled complex architecture features like offline support and deep linking.
Technologies: Swift, Moya, Realm, iOS

Senior iOS Developer

2013 - 2015
YouWowMe Ltd
  • Served as a technical reference for all team members and helped to recruit new members.
  • Contributed to all decisions regarding the application architecture, especially about the application of the best design patterns.
  • Implemented many parts of the application that required a range of technical knowledge.
Technologies: Objective-C, AFNetworking, HTTP REST, VoIP, iOS


A Swift-based application meant to help fishermen.

I composed the proposal based on business requirements, and after approval, I implemented it. I used RxSwift, Moya, Kingfisher, SnapKit to handle the core part of the application. Other technologies were OR code scanning, NFC scanning, MSAL authentication, push notifications, and offline storage.


A RxSwift based app for easier control of JennAir Whirlpool appliances. Users can manage various appliances like ovens, cooktops, refrigerators, dishwashers. I spent most of the time discussing requirements, giving estimates, developing features, writing unit tests.

Wonderfood is a social app for food lovers. Users share food pictures and find new dishes by searching among the hundreds of photos uploaded by the community every month. The app allows easy interactions between users and enables following others.

Hive | Smart Home
A home-automation app is part of an ecosystem that includes both own and third-party equipment.

I was part of a squad that dealt with integrating partner products, e.g., the Philips Hue suite. This project was developed in both Swift and Objective-C.

Baze App
An integrated platform allows users to achieve their best health through a science-led, results-driven food and supplement platform.

I was involved in the iOS application design and then was in charge of implementing different features of the application.

WowApp is a social platform that allows users to win rewards and support different causes. This comes from user activities that typically don't come with rewards, e.g., play games, shop, place international calls, complete surveys, perform tasks, and engage in the network.


Swift, Dart, Objective-C, C++, Pascal, Assembly


UIKit, Flutter, RealmSwift, iOS SDK, Cocoa Touch, AFNetworking, Core Location, Core Data


RxSwift, Firebase iOS SDK, Parse SDK, CocoaPods, Kingfisher, REST APIs, SnapKit, Mantle


Auto Layout, Xcode, Fastlane, SwiftLint, Moya, Git


iOS, MacOS, Firebase, AWS Elastic Beanstalk, Amazon Web Services (AWS), Parse Server


Unit Testing, Model View ViewModel (MVVM), Test-driven Development (TDD), RESTful Development, Mobile Development, Reactive Programming, Functional Reactive Programming, Continuous Integration (CI), Agile Product Management


Cloud Firestore, Amazon S3 (AWS S3), Realm, Databases


Flow Coordinators, Software Consulting, Architecture, User Interface (UI), Networking, Security, HTTP REST, VoIP

1993 - 1998

Master's Degree in Computer Science

Politehnica University of Bucharest - Bucharest, Romania

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