Jakub Serafin Email & Phone Number

Poznań, Woj. Wielkopolskie, Polska | Remote

New York

Work in a team to provide new and improve existing capabilities of Grist (https://www.getgrist.com/)* Spearheaded development of new features in Grist application, enhancing user experience with contextual menus and calendar widgets.* Refactored webhook logic and API communication within Grist, ensuring streamlined execution and optimized interaction.* Designed and deployed AWS infrastructure for EC2 Grist instances, providing a robust and scalable foundation for the application.

Warsaw, Mazowieckie, Poland

Led architecture design and technology stack selection for internal application solutions, while scaling cloud architecture to empower company operations. Championed a team-driven environment prioritizing growth and communication.* Spearheaded development and refactoring of key integrations, boosting data flow consistency and minimizing issues by 70%.* Oversaw system-wide integration of document management and recruitment platforms integration with company data, streamlining critical workflows.* Designed architecture of a company-wide career planning and performance review application, fostering development and alignment.* Scaled the development team by 100% through strategic recruitment and maximized retention.* Facilitated department part of PI planning and integration events, aligning communication and processes across the IT department.

Warsaw, Mazowieckie, Poland

Guided and managed a team of developers, implementing best practices and driving growth while building and maintaining business-critical software solutions.* Cultivated a high-performing team, driving project excellence, and supporting professional development with structured goal-setting and training.* Optimized the 'Avianah' candidate search system, dramatically reducing search times and enhancing efficiency.* Enhanced client support workflows, resulting in a 50% decrease in support resolution time.* Collaborated on organizational communication strategies, improving cross-departmental processes within the IT landscape.

Warsaw, Mazowieckie, Poland

Overall Role Description: Developed and maintained integrations, data analysis applications, and internal operational systems, ensuring smooth business processes.* Led infrastructure upgrades and monitoring strategies, reducing exceptions by 70% and increasing integration reliability.* Restructured internal integrations for continuous data flow, replacing outdated batch processing methods.* Improve time tracking mechanism to include instant error verification for users

Zielona Góra, Woj. Lubuskie, Polska

Designed and developed solutions for a gym equipment activity monitoring system, encompassing a mobile application and a cloud-powered backend.* Architected the initial foundation for the company's mobile application and server backend, enabling workout analytics.* Built a cross-platform (iOS and Android) mobile application in Xamarin to interface with 'SOLO' workout tracking systems.* Leveraged Azure Functions and Cosmos DB to construct a scalable and efficient serverless backend.

Łódź, Woj. Łódzkie, Polska

Contributed to the development and maintenance of the customer application processing system, focusing on new feature development, bug fixing, and preliminary analysis of potential new solutions.* Implemented new functionalities and resolved bugs within the customer application processing system, ensuring smooth user experience and efficient operations.* Conducted initial analysis and proof-of-concept (POC) for potential new solutions, contributing to innovation and continuous improvement.

Łódź, Woj. Łódzkie, Polska

Maintained and enhanced the server-side backend for a mobile application used in a Warehouse Management System (WMS). Collaborated closely with Android developers to implement new functionalities and ensure smooth integration.* Streamlined mobile application backend for superior performance and modularity through refactoring.* Optimized database queries using common table expressions, resulting in significant speed improvements.

Łódź, Woj. Łódzkie, Polska

Collaborated with a team to develop applications for configuring automotive sound systems, catering to the needs of qualified technicians.* Enhanced team workflow and organization, fostering efficiency and collaboration.* Designed and developed a new module for the application from scratch, expanding its functionality and capabilities.

Łódź, Woj. Łódzkie, Polska

Developed web applications in both ASP.Net/TypeScript and pure TypeScript environments, working on various projects for external clients.* Designed and developed the initial version of a dashboard application that presented numerical information as a set of gauges and charts, providing a clear and concise overview of key data.* Created a copyright availability calculator for the Movie Maestro application using graph theory, enabling efficient and accurate copyright management.* Implemented a significant number of features in the Movie Maestro application, contributing to its functionality and overall success.

Zielona Góra, Woj. Lubuskie, Polska

Contributed to the development of a web application designed to streamline the shipment returns process, working within a Scrum team and utilizing the ASP.NET MVC framework.* Collaborated on the initial design of the application's architecture, laying a strong foundation for development.* Played a key role in building and successfully deploying the first production version of the application, leveraging ASP.NET MVC and Bootstrap technologies.* Enhanced the user experience by integrating asynchronous data updates, providing real-time information and optimizing responsiveness.

Zielona Góra, Woj. Lubuskie, Polska

Maintaining and extending .NET web application for energy companies

Zielona Góra, Woj. Lubuskie, Polska

Creating mobile applications for Windows Phone and iOs platforms.

Zielona Góra, Woj. Lubuskie, Polska

Creating mobile applications for Windows Phone and iOs platforms.

Zielona Góra, Woj. Lubuskie, Polska

Creating and improving desktop applications using C#, .net 3.5, Windows Forms and Devexpress controls.

Creating middleware software with using JavaScript and C++. Unit testing.

Łódź, Woj. Łódzkie, Polska

Creating Websites with use of ASP.NET, CSS and JavaScript.

Master'S Degree, Computer Engineering

Engineer'S Degree, Computer Science, 5