Constantin Vicol

Company Overview: An American startup focused on women health and developing systems to help women track their health and get consultations.

Acomplishments:

Enhanced and extended an existing cross-platform mobile app in React Native with TypeScript, integrating new features and connecting it to a Node.js/Express backend to manage patient profiles, appointments, and medical records.

• Integrated Redux Toolkit and Redux-Saga for robust state management and side-effect handling—streamlined data fetching and caching, reducing redundant network calls by 40%.
• Developed key features: real-time secure messaging (WebSockets), in-app appointment booking with interactive calendar, and medication-reminder push notifications via Firebase Cloud Messaging.
• Created custom, accessible UI components and fluid animations using React Native Reanimated 2 and Gesture Handler, delivering a consistent user experience across iOS and Android.
• Leveraged native device APIs—camera for document upload, geolocation for clinic mapping, and HealthKit/Google Fit integration—to enrich user engagement and data accuracy.
• Enforced secured data handling, implementing end-to-end encryption for sensitive patient information.
• Wrote comprehensive unit and integration tests with Jest and React Native Testing Library, achieving over 90% coverage, catching critical bugs pre-release and boosting overall app stability.
• Implemented end-to-end testing with Detox, writing robust E2E tests for login flows, messaging, appointment booking, and medication reminders; integrated tests into the CI pipeline to ensure regression-free releases.
• Optimized performance: trimmed bundle size by 15%, improved initial render time by 25%, and resolved memory-leak issues to maintain sub-2 second cold starts.

Company Overview: A Switzerland Charter jet operator client.

Responsibilities included the development and maintenance of Lunajets' brand websites, showcasing aircraft and charter flights. This involved managing the selling planes website, group charter website, and mobile apps for both internal and external customers. Additionally, I was responsible for creating a comprehensive content management system that unified all websites within a single media system.

Accomplishments:

• Developed three websites using React, Next, and personal Node libraries. Ensured pixel-perfect design, implemented best accessibility practices, and kept development state updated in alignment with technological advancements during that period.
• Worked on creating a new mobile app using React Native for both iOS and Android platforms, aiming to maximize user engagement on both web and mobile platforms.
• Developed and maintained an internal content management system, empowering content managers to independently create complex pages using pre built components provided by the development team. This significantly streamlined the system's maintenance.
• Managed the maintenance of existing systems and websites, ensuring the infrastructure remained up-to date from both a security perspective and in terms of update-ability.
• Integrated new team members into the technical perspective of project and helped them through the process of on boarding as well as in future mentoring.
• Helped led a team of software engineers to successfully develop a major software project on time and within budget.
• Debugged software, identified root causes, and proposed solutions to software issues.
• Reviewed software requirements and provided feedback to ensure that the software meets customer needs.

Company Overview: An American startup focused on mobile app development.

Responsibilities involved the development and maintenance of the Kickback mobile apps for an American startup, as well as overseeing the website functionalities linked to the mobile app. I played a key role in guiding the team, on boarding new members, and establishing the project architecture. Collaborating closely with the founder, I actively contributed to business decisions and took the lead in preparing Continuous Integration/Continuous Deployment (CI/CD) processes.

Accomplishments:

• Developed multiple mobile apps using cutting-edge React Native techniques, prioritizing efficiency to optimize cost savings for investors.
• Implemented robust testing and publishing pipelines, utilizing tools such as Jest, GitHub Actions, and App Center, ensuring a seamless app development and deployment workflow.
• Successfully refactored an existing mobile app for enhanced future maintainability, addressing any issues and optimizing performance.
• Played a crucial role in preparing for a venture capital fund raise, showcasing our app and presenting our vision for the future to potential investors. I actively contributed by preparing prototypes, test builds, and participating in discussions regarding the architecture of upcoming systems. Emphasis was placed on minimizing expenses and maximizing productivity for increased revenue.
• Identified and addressed impediments to team progress and success, resulting in a smoother flow of work and improved team morale.
• An American startup focused on mobile app development.

Company Overview: A staff capital group specializing in short staffing.

Responsibilities included the development, refactoring, and maintenance of both web and mobile apps for a staff capital group specializing in short staffing.

Accomplishments:

• Developed a highly scalable app and successfully upgraded an existing project to a new code base, incorporating fresh functionalities.
• Conducted comprehensive refactoring and test coverage for both the React and React Native apps to enhance reliability and performance.
• Introduced AI models and a recommendation system to optimize customer experience.
• Actively participated in board discussions with decision-making authority regarding development strategies and costs. Additionally, engaged in on-site meetups with clients, fostering direct communication and collaboration.
• Developed a mobile application that increased customer satisfaction.
• Developed data pipelines in cloud-native environments such as AWS, Azure, and Google Cloud Platform.
• Developed a native iOS application with a modern UI/UX design that achieved a 4.5-star rating on the App Store.
• A staff capital group specializing in short staffing.

Company Overview: A Project based company focusing on short term project developments to maximise client tracktion

Responsibilities:

• Demonstrated expertise in creating responsive user interfaces using CSS, HTML, and JavaScript, employing modern design principles and best practices.
• Developed visually appealing and engaging landing pages utilizing CSS, HTML, and JavaScript to drive user engagement and conversion.
• Leveraged the power of React Native to build robust and performant mobile applications for both iOS and Android platforms, ensuring seamless user experiences across devices.
• Meticulously maintained and updated existing apps and websites, employing React and React Native frameworks to enhance functionality, address bugs, and optimize performance.
• Collaborated with designers to create visually captivating banners and seamlessly integrated them into the user interface, while efficiently refactoring outdated code to adhere to modern standards.
• Demonstrated proficiency in working with various APIs to integrate essential functionalities such as push notifications and event handling, enabling real-time updates and enhancing user engagement.
• Played a vital role in developing the overall app infrastructure, including defining the architecture, designing scalable solutions, and contributing to the business model and strategy.
• Utilized library and frameworks such as React, Angular, and Vue to create interactive user interfaces.