Tharaka DharmasiriFull-Stack Developer
"I am a driven Full-Stack Developer & Software Engineer pursuing a B.Sc. (Hons) in Information Technology at SLIIT. I specialize in crafting high-performance SaaS applications, solving real-world business challenges, and engineering complex integrations like enterprise payment gateways and scalable cloud APIs."
Full-Stack Software Engineer & SaaS Developer
Delivered 10+ production-ready web applications
Proven track record pitching & shipping real-world SaaS products
Specialized in Next.js, React, Node.js & Cybersource Payment Gateways
What makes me different
from others.
Critical Thinking
I don't just write code — I analyze problems deeply, question assumptions, and architect solutions that are scalable, maintainable, and future-proof.
How I Think
Root-Cause Discovery: Deconstruct problems to their core constraints instead of patching surface issues.
Scalable Architecture: Architect systems with modular components designed to support 10x user growth.
Trade-Off Evaluation: Analyze execution speed, memory footprint, and maintenance overhead for every design path.
Building impactful products
at scale.
Full-Stack Developer - Intern
SKYREK (Pvt) Ltd. • Remote
Involve the development of enterprise-grade web applications.
Build Admin dashboards using NextJs
Studies about Prisma and PostgreSQL
Implemented report generation features
Built an LMS web application
Engineering real-world
solutions.
Spotlighting my flagship production SaaS platform — built from personal commuter pain to client pitch, HNB Bank Cybersource payment integration, and real live users.
Bus Seat Booking
"My Latest SaaS Product • Real-World Transit Solution"
A comprehensive digital reservation SaaS platform built to solve real-world long-distance transit friction. Passengers get real-time interactive seat selection and enterprise-secure checkout, while bus operators manage schedules, fleets, and revenue.
Automatic 5s state polling & 15-minute concurrency lock
From Commuter Friction to Enterprise Engineering
Personal Pain Point & Proactive Pitch
Traveling frequently on long-distance bus routes, I experienced constant friction — having to call bus operators repeatedly just to check if seats were available. Recognizing an industry-wide gap, I took full initiative: designed a digital platform, built a working prototype, pitched directly to bus owners, and secured client buy-in to digitize their operations.
HNB Cybersource Payment Integration
Initially launched with PayHere. Following the client's strategic decision to partner with HNB Bank (Hatton National Bank), I led the technical integration to convert the payment system to HNB Cybersource Payment Gateway — mastering complex enterprise documentation, cryptographic HMAC signature generation, and secure callback webhooks.
5-Second Real-Time Seat Polling
Engineered an efficient client-side synchronization pipeline that auto-fetches seat layout states every 5 seconds, giving passengers live, instant availability visibility across high-demand bus routes.
15-Minute Automated Seat Locking
Implemented a robust concurrency management system: when a user selects a seat, it automatically locks for 15 minutes. This eliminates race conditions and guarantees zero double-booking during checkout.
Dynamic Admin Layout Designer
Architected a drag-and-drop admin layout builder allowing bus operators to visually design any seat geometry (2x2, 2x1, sleeper, luxury). Passengers always see the exact, true-to-life bus seating configuration.
Full-stack expertise across
the modern web.
Technologies and frameworks I use to build scalable, high-performance web applications and backend architectures.
React
Next.js
JavaScript
TypeScript
Tailwind CSS
Node.js
Express
Java
Python
PostgreSQL
MongoDB
GraphQL
Vercel
GitHub
Git
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VS Code
Vite.js
Figma
Postman
Let's work
together.
Open to new opportunities