Tsiory Rasoloarijaona, Software Developer

Car selling / rental website

Full stack app — React · Node · PostgreSQL

Done
see project on GitHub

Personal portfolio

Static site with animations — HTML · Tailwind

In progress
view demo

Data analysis toolkit

Python scripts & notebooks — pandas · matplotlib

Prototype
see examples

Skills

Java Java
C++ C++
Spring Boot Spring Boot
React React
HTML5 JavaScript
Java Java
C++ C++
Spring Boot Spring Boot
React React
HTML5 JavaScript
Python Python
Pandas Pandas
Hadoop Hadoop
Linux Linux
Python Python
Pandas Pandas
Hadoop Hadoop
Linux Linux

My Services

I'm working as a freelencer

I'm currently proposing my Services on upwork

get in touch on Up work

back-end development

🛠️ Backend Development Services

I help businesses and teams build reliable, secure, and scalable backend systems tailored to their real-world needs.

As a freelance backend developer, I specialize in working with Java and Spring Boot, and offer services including:

  • API Development – RESTful APIs designed with clean architecture and clear separation of concerns.
  • Authentication & Security – Secure login systems using JWT, OAuth2, and access control.
  • Database Design & Integration – PostgreSQL support with data validation and performance.
  • Cloud Deployment & File Storage – AWS Lambda, RDS, and S3 for backend hosting and file handling.
  • Real-Time Communication – WebSocket (STOMP) for live messaging and notifications.
  • Email & File Services – Integration with SMTP/Postfix or Mailgun for sending and managing emails.

🔍 What You’ll Get

  • Scalable backend services built with real-world use in mind
  • Clear and maintainable codebase
  • Honest communication and reliable delivery
  • Solutions that fit your current and future goals

I don't overpromise — I focus on delivering solid work that gets the job done.

front-end

🎨 Frontend Development Services

I create responsive, user-friendly, and fast web interfaces that bring your ideas to life across devices and browsers.

As a freelance frontend developer, I specialize in frameworks like React and Next.js, delivering modern, accessible, and interactive web apps. My services include:

  • Responsive UI Design – Clean layouts that adapt to any screen size.
  • Modern Frameworks – Built with React and Next.js for performance and maintainability.
  • API Integration – Seamless integration with backend services and third-party APIs.
  • Component-Based Architecture – Reusable and scalable UI components for faster development.
  • SEO & Performance Optimization – Fast loading and optimized pages for better search visibility.
  • Accessible & Clean UI – Interfaces built with accessibility and best practices in mind.

🔍 What You’ll Get

  • Pixel-perfect frontend tailored to your brand and audience
  • Clean, maintainable, and scalable code
  • Fast load times and smooth user experience
  • A collaborative approach focused on real user needs

I prioritize clarity, performance, and usability — with no overpromising, just great results you can rely on.

data engineering

📊 ETL Process with Python & pandas

I build efficient and reliable ETL pipelines using Python and the pandas library, ideal for transforming raw data into actionable insights.

🔍 My ETL Workflow

  • Extract – Importing data from diverse sources such as CSV, Excel, databases, or APIs.
  • Transform – Cleaning, filtering, merging, and restructuring data to prepare it for analysis.
  • Load – Exporting the processed data to a database, spreadsheet, or data visualization tool.

⚙️ Tools & Skills

  • Advanced use of pandas for data manipulation.
  • Integration with Jupyter Notebook for transparent and iterative development.
  • Experience with Google Sheets and Looker Studio for reporting and dashboards.
  • Automated workflows for recurring data processing tasks.

I focus on clarity, reproducibility, and performance to ensure your data flows cleanly from source to insight.

desktop development

💻 Desktop Development Skills

☕ JavaFX

  • Built offline desktop applications using JavaFX with clean and structured UIs.
  • Integrated PostgreSQL for robust backend data management.
  • Followed the MVC pattern to separate UI and business logic.
  • Comfortable with Java standard libraries and external APIs.
  • Experience aligns well with backend services developed in Spring Boot.

🖥️ Qt (C++)

  • Developed cross-platform desktop applications using Qt 6.8.1.
  • Implemented local data storage with SQLite.
  • Managed CMake projects for building and maintaining Qt applications.
  • Prepared and packaged apps for deployment and distribution.
  • Focused on offline tools with interactive UI and local functionality.