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URL: https://www.rajiththennakoon.com

⇱ Rajith Thennakoon – Senior Software Engineer in Tokyo

👁 profile-image
Rajith Thennakoon

Senior Software Engineer

I’m a full-stack software engineer with over 7 years of experience building scalable, real-world applications.

I’ve worked on high-impact projects with top-tier companies like Google and Apple, delivering solutions that serve millions of users.

My expertise spans both frontend and backend development, with a focus on clean architecture, performance, and user experience. Whether it’s crafting robust APIs, designing intuitive interfaces, or mentoring developers, I bring a strong mix of technical skill and practical insight to every project.

I can help you with:

  • 🚧 End-to-End Software Projects – From planning to production
  • 📚 Personalized Coaching Sessions – Learn faster with real-world guidance
  • 🧩 Tech Consulting – Architecture, tooling, and best practices that scale
Service
What I Do

I design and develop software that’s fast, scalable, and user-focused.
My work spans full-stack development from crafting intuitive user interfaces to engineering resilient backend systems.

Web Development
Backend Architecture
UI/UX Implementation
API Integration
Database Management
Cloud Computing
Data Analysis
API Development
Experties
Why Choose me

Choosing the right engineer can make or break a project. Here’s what I bring to the table.

Python & Java Experties
JavaScript Experties
GCP & AWS
MySQL & MongoDB
Programming Languages
Python
89%
Java
83%
JavaScript
95%
PHP
90%

Frameworks & Libraris

Django
89%
Flask
83%
Spring Boot
95%
Angular
90%
Cloud Computing
Google Cloud Platform
89%
Amazon Web Services
83%
Database management
MySQL & PostgreSQL
89%
Cloud Spanner
83%
MongoDB
83%
MSSQL
83%
DevOps & Version Control
Docker & Kubernetes
89%
Jenkins
83%
GitHub
83%
Portfolio
Check My Works

Explore some of the projects I've built ranging from mobile apps to full-stack platforms.
Each one reflects my focus on clean code, thoughtful design, and real world problem solving.

👁 financial-management
Personal Finance Management

A web/mobile application designed to help foreigners in Japan effectively manage their personal finances.

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👁 portfolio-management
Stock Portfolio management

A comprehensive tool that allows users to track, analyze, and optimize their stock investments.

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👁 sinhala-youtube-tutorials
Freestyle Coding - YouTube

Practical software engineering tutorials, tips, and deep dives.

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My Blogs
Latest Articles

Stay up to date with my thoughts on software engineering, coding best practices, and tech insights.

👁 minimum-falling-sum-dynamic-programming
Minimum Falling Path Sum (LC 931)

Minimum falling path sum is a classic dynamic programming question on matrix.

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👁 snakes-and-ladders-graph-algorithms
Snakes and Ladders (LC 909)

Let's solve the snakes and ladders problem.

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👁 detect-cycles-linked-list
Detect Linked List Cycle (LC 141)

This is a popular interview question by Microsoft, Amazon, Visa, and many other big guns in the industry.

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Need help bringing your software idea to life or leveling up your coding skills?
  • 💻 Custom Software Development – From concept to deployment
  • 🧠 1-on-1 Coding Coaching – Personalized guidance to boost your skills
  • 🛠️ Code Reviews & Mentoring – Clean, scalable, and maintainable code
Contact
Get In Touch With Me

Have questions, feedback, or collaboration ideas?

Available 24/7
Get In Touch
Location

Japan & Sri Lanka

Email Address

[email protected]

Languages

English, Japanese, Sinhala