Backend & Systems Engineering
Node.js/TypeScript/Express services, PostgreSQL + Drizzle ORM, Redis, semi-microservice architectures, and auth (Firebase, JWT, RBAC).
Proof Delmar Taxi · Accounting Platform
Based in Sri Lanka
Ushan Chamod
Software Engineer
I design and ship full-stack systems that blend clean architecture, practical AI, and excellent product detail. From backend reliability to polished UI, every layer is built to scale and serve real users.
- 3+ yrs experience
- System Design & Architecture
- Backend & Frontend
- AI & Agentic Systems
Background
About
I'm a software engineer who cares how systems work under the hood, not just what features ship. I like tracing a request from the UI all the way down to the query plan, and I reach for simple, maintainable, scalable code over clever code.
Over the past few years I've contributed to production systems across ride-hailing, multi-tenant SaaS, retail/POS, and AI. Working as part of engineering teams, I've helped build real-time backends, tenant-isolated platforms serving hundreds of companies, agentic RAG assistants, and the frontends that power them.
Outside of work I travel and game. Both scratch the same itch as engineering: figuring out how something works and finding the cleanest path through it.
What I do
Expertise
The areas I go deep on — each backed by systems I've shipped.
Real-time & High-Concurrency
Live tracking, event-driven flows, state machines, and double-booking / conflict prevention under concurrent load.
Proof Delmar Taxi (live tracking) · BMICH (booking conflicts)
Multi-Tenant SaaS Architecture
Logical tenant isolation, serverless PostgreSQL (Neon), background jobs, and stateless object storage.
Proof Accounting Platform (200+ companies)
AI / Agentic Systems
LangGraph/LangChain agents, RAG pipelines, vector search (pgvector, Chroma), tool-calling, and resilience patterns.
Proof E-commerce Assistant · Issue Tracker AI · RAG Chatbot
Frontend Engineering
React/Next.js/TypeScript, Zustand, React Query, RTL/LTR i18n (Arabic/English), reusable component libraries, and GSAP.
Proof MediaXGo · Jewelry POS · Enterprise Inventory
Toolbox
Tech Stack
The languages, frameworks, and infrastructure I reach for.
Languages
TypeScriptJavaScriptPythonJava
Frameworks & Runtime
Node.jsExpressNext.jsReactNestJSFastAPI
Frontend
Tailwind CSSSCSSZustandReact Queryi18nextGSAPFramer Motion
Backend & APIs
RESTGraphQL (Apollo)WebSocket / Socket.ioJWTBullMQ
Databases
PostgreSQLMongoDBMySQLRedisNeonpgvectorChromaDBDrizzle ORM
AI / ML
LangChainLangGraphOpenAI APIRAGVector Search
DevOps
DockerGitHub ActionsAWS ECSNGINXCloudflare (R2/DNS)VPSFirebase (Auth/FCM)
Selected work
Projects
Highlights first, then the wider range — from real-time backends to agentic AI and retail platforms.
Delmar Taxi
Lavontech · Nov 2025 - Present
Backend for a ride-hailing platform in a semi-microservice setup (API gateway, core service, dedicated real-time location service). End-to-end ride lifecycle with transaction handling, live driver tracking, and nearby-driver radius search via Redis + Socket.io. Firebase Auth + JWT with role-based access and FCM push notifications.
Node.jsExpressTypeScriptPostgreSQLDrizzleRedisSocket.ioFirebase AuthJWTBullMQ
AI-Powered E-commerce Shopping Assistant
Personal · Nov 2025 - Dec 2025
Stateful autonomous agent for support and sales. Cyclic state machine (LangGraph) for multi-turn reasoning and tool use, hybrid search (vector similarity via OpenAI + pgvector and SQL metadata filters), and RAG over policy docs to cut hallucinations. Circuit breakers, token-bucket rate limiting, and 4-step verification for sensitive actions.
LangGraphLangChainOpenAIpgvectorPostgreSQLTypeScriptRAG
MediaXGo — Digital Signage Campaign Platform
Lavontech · Apr 2026 - Jun 2026
Campaign management for digital out-of-home advertising. Multi-step campaign wizard (single/dual-screen), real-time preview, upload progress, and a full lifecycle (create/schedule/launch/archive/resume/restore). Full Arabic/English RTL/LTR with dark/light theming.
ReactTypeScriptZustandReact QueryTailwindi18next
BMICH Venue Reservation
Visionary Design Vanguard · Jan 2024 - Apr 2024
Digital booking for Sri Lanka's premier convention center. React SPA with Formik multi-step forms, an Express REST API for concurrent load, a normalized MySQL schema (venues, slots, pricing, clients), and real-time availability checks to prevent double-booking.
ReactFormikExpressMySQLREST
More projects
Multi-Tenant Accounting Platform
Sep 2025 - Jan 2026
Enabled 200+ companies to move from paper to a unified digital system. Logical tenant isolation on serverless PostgreSQL (Neon), a type-safe REST API, and stateless object storage on Cloudflare R2 with client-side image processing. Background scheduler for visa-expiry compliance alerts via email. Deployed on VPS with NGINX + Cloudflare.
Node.jsTypeScriptExpressDrizzlePostgreSQL (Neon)Cloudflare R2+1
Issue Tracker with AI Agent
Personal · Aug 2025 - Sep 2025
Full-stack issue tracker with an embedded assistant that retrieves tickets (auth-aware), summarizes, and does web lookups. LangGraph StateGraph with conditional routing and tool calling, an isolated FastAPI AI service, a React + TS frontend, and a Node/Express + MongoDB backend.
ReactNode.jsFastAPILangGraphMongoDBJWT
Conversational RAG Chatbot
Personal · Jul 2025 - Aug 2025
Multi-turn assistant grounded in real documents. Automated loading/chunking/embedding for semantic retrieval, history-aware query reformulation, and session memory.
PythonLangChainOpenAIChromaPyPDFLoader
Jewelry Shop POS
Lavontech · Oct 2024 - Dec 2024
Domain-specific POS: karat-based pricing, weight-based sales, live price adjustments, and return management with inventory recalculation. React UI, REST + GraphQL sync, SCSS, English/Arabic localization.
ReactRESTGraphQLSCSSi18next
Enterprise Inventory & POS Frontend
Lavontech · Jun 2024 - Oct 2024
Frontend architecture for a scalable inventory + POS system. Zustand global state, hybrid REST + Apollo GraphQL fetching, full RTL/LTR i18n, GSAP micro-interactions, and an atomic reusable component library.
ReactZustandApollo GraphQLRESTGSAPi18next
Career
Experience
Lavontech (PVT) LTD
Colombo, Sri LankaSoftware Engineer (Full-Stack)
Sep 2024 - Present- Led backend for Delmar Taxi: full ride lifecycle, cryptographic fare-signature verification, Firebase Auth/OTP/RBAC, admin tooling, dynamic pricing, Redis event-driven architecture, and Docker/AWS ECS CI/CD.
- Built core frontend for MediaXGo, a campaign management SaaS dashboard — reusable component library, billing/subscription module, and real-time campaign launch indicators.
- Delivered retail frontends: a karat-based jewelry shop POS with automated returns, and an enterprise inventory/POS platform with Zustand, hybrid REST/GraphQL sync, and full RTL/LTR localization for Middle Eastern markets.
Back End Developer
Apr 2024 - Sep 2024- Built REST APIs for e-commerce platforms covering product, order, and inventory management across relational and NoSQL databases.
- Contributed to performance optimization and clean, maintainable backend architecture.
Visionary Design Vanguard (VDV)
RemoteTrainee Software Engineer
Jan 2024 - Apr 2024- Built a digital venue reservation platform for BMICH.
- Designed normalized relational schemas for venues, availability, and pricing.
- Implemented real-time checks to prevent double bookings.
Implex Holdings (PVT) LTD
Sri LankaSoftware Engineer (Intern)
Jan 2023 - Nov 2023- Contributed across frontend, backend, API, and database development.
- Assisted schema design and service integration for production systems.
- Built and consumed REST APIs in end-to-end delivery workflows.
Learning
Education
Open University of Sri Lanka
2021 - PresentBachelor of Software Engineering (Honours) · Software Engineering
- Pursuing a four-year Bachelor of Software Engineering Honours (BSEHons) programme designed to produce skilled software engineering graduates, aligned with ACM/IEEE curriculum guidelines.
- Focused on software architecture, development, systems analysis, quality assurance, and communication skills, with all lectures and lab sessions conducted in English.
Thopawewa National School
2016 - 2018Biological Science
- Completed the GCE Advanced Level examination in the Biological Science stream, covering Biology, Chemistry, and Physics, with a strong foundation in scientific knowledge and analytical skills.
Weerapura Junior School
2004 - 2015- Completed the GCE Ordinary Level (O/L) examination at Weerapura Junior School, Polonnaruwa, Sri Lanka.
Credentials
Certifications
Understanding Agentic AI
Digital Workforce Services Plc
Nov 2025ID: 67432c58827e1409ba0ccf8a
Introduction to AI
Nov 2025ID: XPMJI3P7L3HC
Artificial Intelligence Fundamentals
IBM
Jul 2025
Introduction to Data Science
Cisco
Sep 2023
JavaScript Essentials 1
Cisco
Sep 2023
Introduction to Design Thinking
Great Learning
Feb 2023ID: LKGNSHVU
Get in touch
Let's connect
Reach out about my work, systems and AI, or just to say hello.