Roland Tolnay

Senior Flutter Engineer (Technical Lead) at Mara
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Contact Information
us****@****om
(386) 825-5501
Location
Cluj, Romania, RO
Languages
  • Hungarian Native or bilingual proficiency
  • English Native or bilingual proficiency
  • Romanian Full professional proficiency

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Lauren Koertzen

Roland is a rock star. His level of care, ownership, and initiative makes him one of the best developers I've worked with. He is an asset to any team and I hope to work with him again.

Yovko Zhelev

During this year, I had the pleasure of working on the same project with Roland, and I must say he leads by example. He is one of the most dedicated professionals I’ve worked with and is willing to go the extra mile to help you when needed. I like how he used combination of humor and empathy to lift the spirit in stressful situations. His expertise as mobile engineer is considerable and it helped our team to come up with more efficient solutions and develop different features. Thank you Roland for being a great team lead and always an inspiration! I’m delighted I had the chance to learn from you.

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Experience

    • Nigeria
    • Financial Services
    • 1 - 100 Employee
    • Senior Flutter Engineer (Technical Lead)
      • Jul 2022 - Present

      🔰 Building Africa's future on the blockchain 🔰 Building Africa's future on the blockchain

    • United States
    • Staffing and Recruiting
    • 700 & Above Employee
    • Technical Lead | Senior Flutter Engineer • Consultant • Contractor • Freelancer
      • Jul 2021 - Present

      👋 I work as a consultant / contractor / freelancer and help businesses develop their enterprise products. My technology stack of choice is Flutter, delivering cross-platform solutions that run on both iOS, Android and the Web. My previous background is in native iOS development with Swift, but I have also done Objective-C, React Native and Ionic Cordova. 💡 I am continuously looking for new challenges and self-improvement. 👋 I work as a consultant / contractor / freelancer and help businesses develop their enterprise products. My technology stack of choice is Flutter, delivering cross-platform solutions that run on both iOS, Android and the Web. My previous background is in native iOS development with Swift, but I have also done Objective-C, React Native and Ionic Cordova. 💡 I am continuously looking for new challenges and self-improvement.

    • Switzerland
    • Biotechnology Research
    • 700 & Above Employee
    • Senior Flutter Engineer (Technical Lead)
      • Sep 2021 - Jun 2022

      🔰 Patient-centric disease management The client, a leading provider of cancer treatments globally, was struggling to facilitate timely clinical decision-making in disease elimination programs, due to the manual and complex logistics currently used for result delivery in under-resourced areas. ▪︎ 𝐃𝐫𝐚𝐦𝐚𝐭𝐢𝐜𝐚𝐥𝐥𝐲 𝐝𝐞𝐜𝐫𝐞𝐚𝐬𝐞𝐝 𝐭𝐡𝐞 𝐭𝐢𝐦𝐞 𝐭𝐨 𝐝𝐞𝐥𝐢𝐯𝐞𝐫 𝐯𝐢𝐫𝐚𝐥 𝐥𝐨𝐚𝐝 𝐫𝐞𝐬𝐮𝐥𝐭𝐬 𝐛𝐲 10𝐱, leading a team of 6 engineers in designing and implementing a cross-platform solution, allowing patients to scan barcodes for their viral load tests, and delivering dynamically localized real-time results inside the app, removing the need to travel days to their clinic in low-resource rural areas ▪︎ 𝐂𝐨𝐧𝐬𝐢𝐝𝐞𝐫𝐚𝐛𝐥𝐲 𝐫𝐞𝐝𝐮𝐜𝐞𝐝 𝐝𝐢𝐬𝐞𝐚𝐬𝐞 𝐬𝐮𝐩𝐩𝐫𝐞𝐬𝐬𝐢𝐨𝐧 𝐭𝐢𝐦𝐞 𝐛𝐲 100% (from ~200 days down to around 100 days) by implementing configurable medication reminders delivered through push notifications, in-app scheduling of upcoming medical appointments and a medication adherence calendar customized based on the selected treatment that could cache and later submit patient responses even while offline ⚙️ Skills: Flutter, Dart, Clean Architecture, RTL Localization, Unit testing, Integration testing Show less

    • Senior Flutter Engineer
      • Jun 2019 - Jan 2022

      🔰 Multi-tenant appointment management The client, a popular hair salon, was wasting both time and a significant amount of its monthly profit on various inefficient ways of manually booking appointments for its customers due to not having any streamlined, easy-to-use digital solution tailored specifically for its needs. ▪︎ 𝐄𝐥𝐢𝐦𝐢𝐧𝐚𝐭𝐞𝐝 𝐨𝐯𝐞𝐫 80% 𝐨𝐟 𝐬𝐭𝐚𝐟𝐟 𝐨𝐯𝐞𝐫𝐡𝐞𝐚𝐝 by significantly simplifying booking appointments, by designing a highly-intuitive digital platform, delivering robust performance thanks to leveraging a modular architecture built with Flutter’s lightweight widgets, bundled together into an engaging user interface. ▪︎ 𝐄𝐧𝐬𝐮𝐫𝐞𝐝 𝐳𝐞𝐫𝐨 𝐚𝐝𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐜𝐨𝐬𝐭𝐬 in maintaining or updating both price and offer descriptions, by allowing easy, real-time changes without republishing the app by deploying an admin interface using Flutter Web and Firebase Hosting, which reused over 85% of the code from the mobile solution. ⚙️ Skills: Flutter, Dart, Provider, GetIt, FirebaseDB, Cloud Messaging, Store Publishing Show less

    • United States
    • Restaurants
    • 1 - 100 Employee
    • Senior Flutter Engineer
      • Jun 2020 - Jun 2021

      🔰 Real-time order management The client, a high-end restaurant, was wasting profits on paying employee overhead due to a communication bottleneck between waiters and kitchen staff in processing orders, causing long customer waiting times and employee frustration. ▪︎ 𝐄𝐥𝐢𝐦𝐢𝐧𝐚𝐭𝐞𝐝 100% 𝐨𝐟 𝐬𝐭𝐚𝐟𝐟 𝐨𝐯𝐞𝐫𝐡𝐞𝐚𝐝 spent on communication between departments, by designing and implementing a cross platform Flutter application, which processes orders in real time by listening to live updates on a Firebase database, notifies users of any changes in order status via push notifications, allows dynamic over-the-air configuration of tables and recipes via an admin interface and supports seamlessly exporting all data into a Google Sheets document. ⚙️ Skills: Flutter, Dart, Provider, Firebase, TypeScript, Store Publishing Show less

    • Germany
    • IT Services and IT Consulting
    • 700 & Above Employee
    • Senior iOS Engineer (Technical Lead)
      • Feb 2020 - Jun 2021

      🔰 B2B Secure cloud storageThe client, a provider of secure B2B cloud storage, was missing out on numerous new business opportunities due to being constrained to a poorly developed product that was using a deprecated technology, which made it both extremely expensive and difficult to further scale or maintain.▪︎ 𝐁𝐨𝐨𝐬𝐭𝐞𝐝 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐫𝐞𝐯𝐢𝐞𝐰𝐬 𝐟𝐫𝐨𝐦 2.5 𝐬𝐭𝐚𝐫𝐬 𝐭𝐨 𝐚 𝐬𝐭𝐚𝐠𝐠𝐞𝐫𝐢𝐧𝐠 5 𝐬𝐭𝐚𝐫𝐬 by leading a team of 4 highly skilled iOS and Android developers in delivering a completely redesigned solution, implemented using a custom VIPER architecture, Reactive programming and efficient data storage thanks to CoreData (iOS) and Room (Android).▪︎ 𝐃𝐫𝐚𝐦𝐚𝐭𝐢𝐜𝐚𝐥𝐥𝐲 𝐝𝐞𝐜𝐫𝐞𝐚𝐬𝐞𝐝 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐥𝐨𝐚𝐝 𝐭𝐢𝐦𝐞𝐬 𝐛𝐲 50% while at the same time reducing the 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐜𝐫𝐚𝐬𝐡𝐞𝐬 𝐢𝐧 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐭𝐨 𝐯𝐢𝐫𝐭𝐮𝐚𝐥𝐥𝐲 0 by leveraging analytical skills to optimize offline data synchronization, working with the backend team in developing new REST endpoints, and ensuring code quality by coaching team members to follow best practices on decoupling code, writing unit and integration tests, and producing in-depth documentation for the delivered solution.⚙️ Skills: Swift, UIKit, RxSwift, CoreData, VIPER, WebSockets, Unit + UI Testing, Gitlab CI/CD Show less

    • Senior Flutter Engineer
      • Sep 2019 - Jul 2020

      🔰 Enterprise parking spot allocationThe client, a company activating mainly in IT, was facing difficulties trying to honor the agreement of assuring parking spot benefit to its employees while also losing valuable resources, due to using a manually maintained schedule rather than an automated parking spot generator, which led to unfairness and repeated employee frustration.▪︎ 𝐄𝐥𝐢𝐦𝐢𝐧𝐚𝐭𝐞𝐝 𝐨𝐯𝐞𝐫 90% 𝐨𝐟 𝐥𝐚𝐛𝐨𝐫 𝐜𝐨𝐬𝐭𝐬 spent on manually allocating parking spots by designing and delivering a highly-intuitive Flutter application, which authenticated employees stored inside the company’s Azure AD using an OAuth 2.0 authorization flow, automatically assigned parking spots every morning using a REST API, and promptly notified its users of any last minute changes using customised Push Notifications.⚙️ Skills: Flutter, Dart, Provider, RxDart, GetIt, OAuth2, REST, Jenkins CI/CD, Git, SCRUM Show less

    • Senior iOS Engineer (Technical Lead)
      • Sep 2019 - Jan 2020

      🔰 B2C TelecommunicationsThe client, a telecommunications company offering phone and internet subscription plans to customers, was losing revenue by being unable to extend their product with new features due to being limited by a legacy platform, developed with a mix of native and web components which provided poor user experience and made it unreasonably expensive to extend it with new functionality.▪︎ 𝐃𝐫𝐚𝐦𝐚𝐭𝐢𝐜𝐚𝐥𝐥𝐲 𝐢𝐧𝐜𝐫𝐞𝐚𝐬𝐞𝐝 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐬𝐩𝐞𝐞𝐝 𝐨𝐟 𝐧𝐞𝐰 𝐟𝐞𝐚𝐭𝐮𝐫𝐞𝐬 𝐛𝐲 𝐨𝐯𝐞𝐫 70% leading a team of 6 talented iOS and Android developers in creating and delivering a high-performing native application from scratch, applying analytical skills to design a scalable architecture that could securely process payments, leveraging communication skills to coordinate multiple disciplines within the team (development, QA, UX/UI, PM), and demonstrating initiative in clarifying missing requirements which could be met under the pressure of a tight deadline.⚙️ Skills: Swift, UIKit, RxSwift, MVVM, Jenkins CI/CD Show less

    • Senior iOS Engineer
      • Feb 2018 - Sep 2019

      🔰 Modular Internet of Things (IOT) solutionThe client, a company manufacturing IoT devices, was unable to deliver competitive new features and as a consequence was losing a significant amount of revenue due to being constrained by a cross platform solution implemented using Ionic Cordova, which also made it unreasonably expensive to support integrating with 3rd party hardware.▪︎ 𝐃𝐫𝐚𝐬𝐭𝐢𝐜𝐚𝐥𝐥𝐲 𝐫𝐞𝐝𝐮𝐜𝐞𝐝 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐜𝐨𝐬𝐭𝐬 𝐨𝐟 𝐢𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 3𝐫𝐝 𝐩𝐚𝐫𝐭𝐲 𝐡𝐚𝐫𝐝𝐰𝐚𝐫𝐞 𝐛𝐲 𝐨𝐯𝐞𝐫 75%, by designing and implementing a modular architecture rewritten for native iOS, allowing 3rd party developers to seamlessly plug-in to the system by providing device specific configuration using just a JSON and JavaScript file, downloaded and parsed at runtime using Decodable and WebKit.⚙️ Skills: Swift, UIKit, RxSwift, VIPER, OAuth2, Region Monitoring, WebSockets, Unit Testing, JavaScript, Ionic Cordova, Jenkins CI/CD Show less

    • Public Speaker
      • Nov 2018 - Aug 2019

      🔰 Hosted a talk at the Mobile Unplugged conference in Cluj on Swift extensions that make your code more readable and maintainable. It was an amazing opportunity for me to move out of my comfort zone, and explore how knowledge sharing can deliver value to a wider audience.👇 A link to the online stream featuring my talk can be found below.

    • React Native Engineer
      • Jun 2017 - Feb 2018

      🔰 Cross-platform identity solution SDKThe client, a provider of secure and reliable identity solutions, was in danger of losing a significant amount of its customers due to providing a poor user experience caused by relying on a web based solution to gather user data, which was neither customizable nor easy to integrate.▪︎ 𝐃𝐞𝐬𝐢𝐠𝐧𝐞𝐝 𝐚𝐧𝐝 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 𝐚 100% 𝐜𝐮𝐬𝐭𝐨𝐦𝐢𝐳𝐚𝐛𝐥𝐞 𝐒𝐃𝐊 𝐰𝐫𝐢𝐭𝐭𝐞𝐧 𝐢𝐧 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞, which could be seamlessly integrated into native mobile apps, adopting their look and feel by dynamically configuring colors, fonts, and screens using a JSON file and making use of the device camera to easily scan a users ID or passport, allowing the auto-fill of information needed for the identification process.⚙️ Skills: React Native, JavaScript, Redux, Native Modules, Objective-C, BASH, Fastlane, Crashlytics, HockeyApp Show less

    • Romania
    • Software Development
    • 1 - 100 Employee
    • Senior iOS Engineer
      • Jan 2017 - Jun 2017

      🔰 Mobile live-streaming ⚙️ Skills: Objective-C, UIKit, MVVM, OAuth2, REST, In-App Purchases, Firebase, App Store Connect 🔰 Mobile live-streaming ⚙️ Skills: Objective-C, UIKit, MVVM, OAuth2, REST, In-App Purchases, Firebase, App Store Connect

    • Denmark
    • Higher Education
    • 300 - 400 Employee
    • Software Engineer
      • Aug 2014 - Jun 2016

      🔰 Leukaemia patient monitoring ⚙️ Skills: Objective-C, JavaScript, Ionic Cordova, AngularJS, MeteorJS, MongoDB 🔰 Leukaemia patient monitoring ⚙️ Skills: Objective-C, JavaScript, Ionic Cordova, AngularJS, MeteorJS, MongoDB

Education

  • Erhvervsakademi Aarhus | Business Academy Aarhus
    Bachelor’s Degree, Computer Software Engineering
    2012 - 2016

Community

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