Rositsa Ivanov

Backend Developer with 7+ years of overall experience, including 4 years of experience in C#/.NET and Azure-based architectures. Specialized in backend feature development, integration, automated testing, and database optimization. Experienced working in international teams and Agile environments, with a strong focus on product reliability and scalability.

WORK EXPERIENCE

Backend Developer

Sunweb Group | 03/2022–11/2025

1. One of Europe’s largest online travel agencies, 7International markets; (Netherlands, Belgium, Denmark, Sweden, France, UK, Germany); +€1.2 bn in turnover

• Backend development in .NET/C# for post-booking management and customer care systems, used daily by thousands of users.
• Performance and reliability improvements of critical features, including travel data and digital documents.
• Implementation of automated tests (unit, integration, and end-to-end), increasing robustness and reducing production incidents.
• Management of integrations with Azure (Functions, Service Bus, Logic Apps) and optimization of SQL/NoSQL queries.
• Active participation in Scrum processes: planning, review, refinements, and collaboration with product teams.

Skills & competencies

• Backend: C#, .NET, LINQ, SOLID, Clean Architecture, Design Pattern
• Testing: xUnit, FluentAssertions, Moq, AutoFixture, E2E Testin
• Cloud & Integrations: Azure Functions, Service Bus, Logic Apps
• Databases: SQL Server, MySQL, Redis, Cosmos DB
• Version Control: Git, GitHub
• DevOps: GitHub Actions / GitHub Deploy, Octopus Deploy, CI/CD
• Monitoring: New Relic, Kibana
• CMS: Sitecore 
• Frontend Development (support): HTML, CSS, JavaScript, React
• Project Workflow Management: Jira
• AI: Use of code assistants and generative AI tools (GitHub Copilot, ChatGPT, …) to accelerate refactoring, write tests, and produce technical documentation

Full Stack Developer

DavinciTI | 10/2019–03/2022

Barcelona Activa Project (Barcelona City Council) websites supporting job-seeking, training, and business initiatives.

• Focused on the development of internal web applications for project and people management.

Skills & competencies

• Backend: Java, Spring, JEE, ORM: Hibernate, Web services: REST/SOAP, SOLID, Clean Architecture, Design Patterns
• Frontend Development: HTML, CSS, JavaScript, jQuery, Ajax, Bootstrap
• Testing: jMock, Mockito
• Databases: MySQL Server,
• Version Control: Git, GitHub
• Web Containers: Tomcat, JBoss
• Project Workflow Management: Jira

Full Stack Developer

Euromus by ccalgir | 10/2018–10/2019

1. Ticket sales and access control platform for museums, theme parks, and wineries.

• Maintained and created new website components for wineries.

Skills & competencies

• Backend: Java, Spring, SOLID, Clean Architecture, Design Patterns
• Frontend Development: HTML, CSS, JavaScript, jQuery, Ajax
• Databases: MySQL Server,
• Version Control: Git, GitHub

End-of-degree Project

eXiT Research Group, UdG | HIT2GAP Project | 03/2018–09/2018

• Developed web service for preprocessing data for prediction of electrical load in non-residential buildings.

Skills & competencies

• Programming Languages: Python
• Frameworks: Flask;
• ML tools: scikit-learn, RapidMiner
• Statistical computing tools: pandas, R

Degree in Computer Science              University of Girona, Spain (2012–2018)