Ratnapura, Sri Lanka · Open to Remote

Hi, I'm Sachith Chamara

Senior Software Engineer

10+ years building scalable microservices & full-stack platforms — Java, Spring Boot, AWS, React.

/About

Senior Software Engineer with 10+ years of experience designing, developing, and maintaining scalable full-stack web applications and microservices. Proven expertise in Java, Spring Boot, RESTful APIs, AWS cloud services, and relational databases. Experienced in leading Agile/Scrum teams, implementing CI/CD pipelines, and delivering high-quality software in distributed, cross-functional environments.

10+

Years of Experience

Companies

10+

Major Projects

Regions Served

/Experience

Aeturnum Lanka (Pvt) Ltd

Aug 2021 — Present

Colombo, Sri Lanka

Associate Technical Lead↞Senior Software Engineer

Architected a full-stack transaction payment platform (Secure Fund Portal) from the ground up for brokers, real estate offices, and landlords.
Built and maintained microservices for Incentivio, a multi-channel restaurant digital platform, on AWS (EC2, S3, EKS, Lambda, RDS).
Developed Kitchen Sync API — a Node.js/TypeScript REST API synchronizing POS order data from Toast and Square.
Drove Agile/Scrum processes and CI/CD best practices with Jenkins and Gradle, improving release velocity.

Java 8/11Spring BootHibernateAWSMicroservicesNode.jsTypeScriptMySQLMongoDBDockerJenkins

Care Systems South Asia (Pvt) Ltd

Jun 2019 — Jul 2021

Colombo, Sri Lanka

Senior Software Engineer↞Software Engineer

Led re-engineering of a legacy Workforce Management System for clients in the USA and Middle East, modernizing architecture and performance.
Designed scalable backend services with Java 8, Spring Boot, Spring MVC, and Hibernate; added Spring Actuator monitoring and Swagger docs.
Built employee management, staff scheduling, time & attendance, and payroll configuration modules for HR systems.

Java 8Spring BootSpring MVCHibernateMSSQLJenkinsMaven

LOLC Advanced Technologies

Oct 2018 — Apr 2019

Colombo, Sri Lanka

Associate Software Engineer

Designed and developed a web-based Vehicle Valuation System that streamlined valuation processes and improved customer responsiveness.
Mentored team members in Agile SDLC and Rapid Application Development best practices.

Spring MVCHibernateOracleJSPBootstrapWebLogic

Olak Technologies (Pvt) Ltd

Mar 2018 — Sep 2018

Colombo, Sri Lanka

Software Engineer

Developed a Farmer Portal web application for a leading food-industry project management platform.
Earned the highest customer satisfaction rating for all delivered software solutions.

Spring MVCHibernateMySQLJSPBootstrapBitbucket

Inhot Solutions (Pvt) Ltd

Nov 2015 — Feb 2018

Colombo, Sri Lanka

Software Developer

Developed and maintained an Institute Management System across the full software lifecycle.
Led the full SDLC for a Customer Feedback Management System with RESTful web services.
Built native Android apps (Fixed Asset Management, Gate Pass Management) for a hotel group.

JavaSpring MVCHibernateMySQLMSSQLNative AndroidREST

/Projects

AI Interview Platform

AI Works

AI-powered async interview platform — parses job descriptions, generates rubric-backed questions, runs text, voice, and coding interviews, then scores answers and produces reports with integrity signals.

Next.js 15FastAPIPythonPostgreSQL + pgvectorRedis+3

Case Study

Presmo — AI Document-to-Deck

LiveAI Works

Micro-SaaS that turns a PDF, pasted text, or URL into a themed, editable PowerPoint deck using Claude — slide previews, magic-link auth, free tier, and tiered billing.

PythonFastAPIClaude APIpython-pptxpdfplumber+2

Case Study Live App

AI Chatbot for SMEs

AI Works

Multi-tenant, embeddable AI chatbot SaaS — a single script tag adds a website assistant that answers from the business's own content, captures and qualifies leads, and books appointments.

FastAPIPythonJavaScript WidgetLocal EmbeddingsMulti-LLM Failover+1

Case Study

Celoyn Shorts Engine

AI Works

Data-driven pipeline for faceless AI-Shorts production — one JSON config and one command renders a complete short with AI voiceover, animated scenes, and captions.

Remotion 4React 19TypeScriptPythonedge-tts+1

Case Study GitHub

Restaurant Ordering Platform

Personal

Multi-tenant restaurant order management system — customer ordering, admin dashboard, and kitchen display built on event-driven Spring Boot microservices with saga orchestration.

Spring Boot 3MicroservicesMySQL + FlywayRedisRabbitMQ+3

Case Study

Celoyn.com

LivePersonal

Marketing site for Celoyn, my AI & software consulting studio — services showcase, lead capture, and contact funnel, deployed on the edge.

Next.js 16React 19Tailwind v4Framer MotionCloudflare Workers

Live Site

Secure Fund Portal

Professional

Full-stack transaction payment platform serving brokers, real estate offices, and landlords across leasing and sales operations — architected from the ground up.

Java 8Spring BootHibernateAWS CognitoAWS SES+4

Case Study

Incentivio Platform

Professional

Multi-channel restaurant digital platform (web, mobile, in-store) supporting ordering, loyalty, marketing, CRM, and analytics for enterprise restaurant clients.

Java 11Spring BootAWS EKSAWS LambdaMySQL+3

Case Study

Kitchen Sync API

Professional

RESTful API integrating and synchronizing external POS order data from Toast and Square, enabling unified dashboards and reporting.

Node.jsExpress.jsTypeScriptMySQLDocker+2

Case Study

/Services

AI Feature Integration

Add LLM-powered capabilities to your existing product — assistants, document processing, summarization, or structured data extraction. Strict output contracts and prompt caching keep results reliable and API costs under control.

Claude / OpenAI APIsPrompt EngineeringTool UseCost Optimization

RAG & Knowledge Chatbots

Custom chatbots that answer from your own content — docs, website, or internal knowledge. Embeddable with a single script tag, with lead capture and appointment booking built in.

RAGpgvectorMulti-tenant SaaSLead Qualification

AI Product & MVP Development

From idea to a live, revenue-ready product: LLM pipeline, auth, tiered billing, and admin tooling. I've shipped this end to end as a solo builder — see Presmo, live in production.

FastAPINext.jsSubscription BillingSolo Delivery

Backend & Microservices

Design, build, or rescue Spring Boot microservices and REST APIs — drawing on 10+ years shipping scalable backends for products serving three regions.

JavaSpring BootREST APIsSystem Design

Full-Stack Web Applications

Complete web applications from database schema to polished UI — React or Angular frontends backed by Java or Node.js services, delivered with tests and CI.

ReactTypeScriptNode.jsMySQL / MongoDB

AWS Cloud Integration

Build product features on AWS services and deliver your application running in the cloud — user authentication with Cognito, file storage with S3, serverless functions with Lambda, containerized with Docker.

AWS (S3, Lambda, Cognito)ServerlessDockerCloud Deployment

Every project is different, so pricing is by custom quote— tell me what you're building and I'll get back to you within a day.

Get a Custom Quote

/Skills

Backend

JavaSpring BootSpring MVCHibernateNode.jsExpress.jsMicroservicesREST APIs

Frontend

ReactAngularTypeScriptJavaScriptHTML5CSS3Bootstrap

Cloud

AWSEC2S3EKSLambdaCognitoDockerGCP

Databases

MySQLMSSQLOracleMongoDBFirebase

AI & Emerging

LLM Integration (Claude, OpenAI, Groq)RAG & Vector Search (pgvector)Prompt EngineeringFastAPIAI-Driven Development

Practices & Tools

Agile/ScrumSystem DesignGitGradleMavenJiraSwaggerLiquibase

/AI Lab

Live demo

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/Education

Sabaragamuwa University of Sri Lanka

BSc (Applied Sciences) — Special Degree in Computer Science and Technologies

GCE Advanced Level

Combined Mathematics, Physics, Chemistry

/Contact

Let's build something together.

I'm open to remote senior engineering roles and interesting collaborations. Use the form, or reach me directly:

sachithaberathna40@gmail.com LinkedIn