Frontend engineering
React, Next.js, TypeScript, accessible interfaces, and server-rendered experiences.
Available for opportunities
SENIOR SOFTWARE ENGINEER
Building Reliable Software for Real World Scale.
I’m Sandaruwan Jayasundara, a full-stack and AI engineer based in Sri Lanka. I design scalable web products, enterprise backends, and intelligent systems using React, Next.js, Node.js, Java, Spring Boot, and AWS.
React & Next.jsJava & Spring BootAI & RAGAWS & Cloud
Sandaruwan Jayasundara
Full Stack Developer
5+
Years Experience
25+
Projects Delivered
10+
Technologies
8+
Certifications
How I work
Engineering across the full product lifecycle
I’m a Senior Software Engineer focused on turning complex requirements into clear, maintainable systems. My experience spans AI products, enterprise platforms, telecommunications, booking systems, and cloud applications.
I work across product discovery, system design, implementation, integration, deployment, and ongoing improvement—keeping technical decisions aligned with user needs and business outcomes.
Backend architecture
Node.js, Java, Spring Boot, APIs, microservices, and relational data systems.
Applied AI
RAG, LangChain, OpenAI, vector retrieval, and AI features grounded in product needs.
Cloud delivery
AWS, Docker, CI/CD, production deployment, monitoring, and reliable operations.
Software engineering services
AI, Java, React, Next.js and Full-Stack Engineering in Sri Lanka
I design and deliver production software across frontend, backend, AI, data, and cloud infrastructure. Explore each area for relevant capabilities, technologies, architecture practices, and project experience.
AI Engineering
Generative AI, RAG, LangChain, OpenAI integrations, vector search, and intelligent product development.
Explore AI EngineeringJava & Spring Boot
Secure REST APIs, enterprise backend systems, microservices, Kafka, relational databases, and cloud deployment.
Explore Java & Spring BootReact & Next.js
Fast, accessible, server-rendered web applications, SaaS interfaces, dashboards, and design systems.
Explore React & Next.jsFull-Stack Development
End-to-end software delivery from Sri Lanka for startups and global teams using React, Node.js, Java, AI, and AWS.
Explore Full-Stack DevelopmentCareer journey
Experience built in production environments
From enterprise telecommunications to AI products, each role has strengthened my approach to architecture, delivery, and technical collaboration.
Full experienceJul 2024 – Present
Senior Software Engineer
Decryptogen LLC
Leading the design and development of modern, scalable web applications using React, Next.js, React SSR, Spring Boot, Node.js, and Python. Experienced in DevOps practices with Docker and Jenkins, and deploying solutions on AWS Cloud. Skilled in working with both MongoDB and PostgreSQL databases. Additionally, specializing in AI development leveraging OpenAI, LangChain, and FAISS for building intelligent, data-driven applications. Collaborating with international teams to deliver high-quality, innovative software solutions.
Apr 2023 – Jul 2024
Software Engineer
Mobitel (PVT) LTD
Full-stack development with a focus on building and maintaining large-scale enterprise and telecommunications applications using Java, Spring Boot, Apache Kafka, React.js, TypeScript, and Angular. Skilled in working with SQL databases including Oracle DB and Informix DB. Experienced in DevOps practices using Jenkins and Docker, with cloud deployments on Microsoft Azure.
Jun 2022 – Mar 2023
Associate Software Engineer
Wenthura Solutions
Member of the R&D development team, contributing to both frontend and backend applications. Gained valuable experience in Java, ReactJS, NodeJS and modern development practices.
Selected work
Projects built for real users and operations
A selection of AI, enterprise, and full-stack products across different industries and technical environments.
AI systemFeatured
Lead Developer
Aiden – AI Chat Assistance
An intelligent AI-powered chat assistance application using RAG (Retrieval Augmented Generation) for context-aware responses. Features document Q&A, conversation memory, and multi-model support.
ReactNode.jsLangChainOpenAI+3
Web applicationFeatured
Full Stack Developer
eQuip – Equipment Rental System
End-to-end equipment rental platform with inventory management, booking system, payment integration, and admin dashboard.
ReactNode.jsMongoDBExpress+2
Web applicationFeatured
Full Stack Developer
Gear Genie – eCommerce Platform
Feature-rich e-commerce and rental platform with product catalog, cart management, user accounts, and order tracking.
ReactNode.jsMongoDBExpress+1
Available for the right opportunity
Have a product, platform, or engineering challenge?
I’m open to senior engineering roles, remote collaborations, and focused software projects where thoughtful architecture and dependable execution matter.