Basith Khan

Backend · Middle · Trincomalee, Sri Lanka · UTC+05:30 · Work permits: Sri Lanka · Can start now

Support Specialist

JavaScript

TypeScript

Java

Node JS

Python

API Design: 5/10

Data Layer & Database: 5/10

Scalability & Performance: 4/10

Active 3 days ago

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Overview

Technical skills

Projects

Timeline

Roles

Overview

A backend-focused engineer building web and real-time systems, assessed at an early senior level with strong practical skills in API and real-time ingestion design. The most proven skill is real-time behavior ingestion and analysis as implemented in backend/src/services/behaviorAnalysis.js and backend/src/socket/index.js which show windowed analytics, event emission and batched persistence. Public code lacks structured observability, formal load testing artifacts, and documented token lifecycle/advanced security controls.

Technical skills

Languages

JavaScript

TypeScript

Java

Node JS

Python

Node JS

Express

Bcrypt

Mongoose

Axios

Helmet

Java

Spring Boot

Spring Framework

Spring Data JPA

Frontend

React.js

Zod

Next.js

Tailwind CSS

React Router

Socket.IO

Other

Entity Framework Core

ASP.NET Core

AWS

Recharts

Vite

GitHub

Dotenv

Rest API

CI/CD

Machine Learning

RAG

Projects

Library Management System

Jan 2025 to Present

Built a library management system to support core library workflows. Focused on managing resources and related operational data in an application. The project reflects practical full-stack development for a structured domain.

Vehicle Rental System

Jan 2023 to Present

Developed a vehicle rental system for managing rentals and related information. Implemented the application logic needed to support rental operations. The project applies software engineering skills to a real-world rental workflow.

Data Warehouse & BI Solution

Created a data warehouse and business intelligence solution for organizing and analyzing data. Focused on structuring data for reporting and analytics use cases. The project demonstrates end-to-end thinking from data preparation to BI consumption.

Car Insurance Claim Prediction

Developed a car insurance claim prediction solution to estimate outcomes based on input data. Implemented a prediction workflow suitable for analytics or decision support. The project showcases using machine learning techniques for insurance-related use cases.

Medical Chatbot (RAG-based Generative AI)

Built a medical chatbot using retrieval-augmented generation (RAG) for generative responses. Focused on combining knowledge retrieval with AI-generated answers. The project demonstrates applying modern NLP and AI concepts to a healthcare domain.

Timeline

Software Engineer Intern · Junior

A2Z Expert Pvt Ltd · Internship

In office

Worked on software engineering tasks as an intern, contributing to development activities. Assisted with implementing features and supporting backend or integration work. Gained practical experience applying software development practices in a professional setting.

Associate IT Support Engineer · Middle

Port City BPO · Full-Time

In office

Provided IT support services within a BPO environment, handling day-to-day technical assistance. Supported users with troubleshooting and basic infrastructure-related issues. Contributed to maintaining reliable workplace IT operations.

Middle Backend Developer Confidence: Medium API Engineer

API Design

5/10

How well APIs are designed

Reasonable API design with input validation, consistent error handling and pagination in places, but no visible versioning strategy or idempotency keys and only basic error contract consistency.

Evidence

abk-01/research_demo/backend/src/routes/games.routes.js: zod input validation and try/catch -> next(e) pattern abk-01/research_demo/backend/src/routes/auth.routes.js: request validation, sanitize user output and token issuance abk-01/ecommerce_java/src/main/java/com/ecommerce/controller/ProductController.java: pagination endpoints and consistent response envelope

Data Layer & Database

5/10

Working with databases

Clear use of ORMs and migrations, batched writes and transactional service boundaries are present, but there are some patterns that can cause N+1 queries and no explicit advanced tuning or isolation-level handling is visible.

Evidence

abk-01/research_demo/backend/src/socket/index.js: flushSamples batching with GazeSample.insertMany(..., { ordered: false }) abk-01/ecommerce_java/src/main/java/com/ecommerce/service/ProductService.java: @Transactional service methods and repository usage abk-01/game-store-repo/GameStore.Api/Data/Migrations/20250926131247_RenameGenderToGenre.cs: EF Core migration showing schema evolution

Scalability & Performance

4/10

Handling load and speed

Some practical scalability work for real-time ingestion (client-side throttling, server batching), but no caching/invalidation strategy, queuing, rate limiting config, or load-test artifacts are present.

Evidence

abk-01/research_demo/frontend/src/hooks/useGazeTracking.js: client-side throttling of gaze samples abk-01/research_demo/backend/src/socket/index.js: per-session sampleQueue and flushSamples triggered by queue size abk-01/research_demo/backend/src/services/behaviorAnalysis.js: streaming/windowed computations to limit memory and compute per-sample

System Architecture

4/10

Overall system structure

Logical module separation (routes, models, services, socket layer) and layered Java services are visible, demonstrating deliberate decomposition, though the system is monolithic across a few apps and lacks service contracts or advanced config/secret management patterns.

Evidence

abk-01/research_demo/backend/src/services/behaviorAnalysis.js and abk-01/research_demo/backend/src/socket/index.js: separation of behavior analysis, adaptive engine and socket orchestration abk-01/ecommerce_java/src/main/java/com/ecommerce/service: layered Service -> Repository structure present

Security & Auth

4/10

Protecting data and access

Basic security hygiene is present: password hashing, JWT usage, input validation and sanitization, but token lifecycle, refresh/revocation, dependency-audit evidence and deeper boundary protections are not shown.

Evidence

abk-01/research_demo/backend/src/routes/auth.routes.js: bcrypt password hashing and sanitize() removing passwordHash abk-01/research_demo/backend/src/middleware/auth.js: jwt import and sign/verify signatures (authentication layer exists)

Reliability & Observability

3/10

Stability and monitoring

Some reliability patterns exist such as try/catch, graceful flush on disconnect and an error middleware, but structured logging, metrics, retries with backoff, timeouts and graceful process shutdown are not evident.

Evidence

abk-01/research_demo/backend/src/socket/index.js: disconnect handler flushes pending samples and uses try/catch when persisting abk-01/research_demo/backend/src/routes/games.routes.js: route-level try/catch forwarding to error middleware abk-01/research_demo/backend/src/middleware/error.js: notFound and errorHandler signatures indicate centralized error handling

Expertise

Node.js· Middle

Java· Middle

.NET· Middle

Industries

Commerce· Middle

Education· Middle

Gaming· Middle

Technologies

Rest API

Spring Boot

Bcrypt

Mongoose

Helmet

Dotenv

Recommendations

Extend the adaptive pipeline by adding metrics and structured logging (correlation ids) around events and persistence to enable SLO-driven alerting and debugging.
Introduce a small queue (e.g., Redis stream or RabbitMQ) between socket ingestion and DB writes to improve resilience under load and enable backpressure and retries with exponential backoff.
Add integration tests and load tests for the real-time path (socket ingestion -> analysis -> storage) and unit tests for the BehaviorAnalyzer thresholds and state transitions.
Refine API design with explicit versioning, idempotency for session end/result endpoints and documented error contracts to improve backward compatibility.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

research_demo ecommerce_java game-store-repo

Middle Frontend Developer Confidence: Medium Fullstack

Fullstack web developer at a senior level focused on real-time client-server interactions and adaptive UX. The strongest proven skill is building robust real-time data flows and behavioral analysis as shown by the BehaviorAnalyzer stateful processor and the socket session management with batching and persistent gaze-sample flush logic. There is limited public evidence of systematic a11y practice, test coverage, or large-scale architecture documentation and metrics-driven performance validation.

UI Component Architecture

4/10

How interface parts are built

Some deliberate component choices visible via custom hooks and curated global styles, but limited evidence of a homegrown component library, strong composition patterns or large-scale design-system ownership.

Evidence

abk-01/research_demo/frontend/src/hooks/useGazeTracking.js abk-01/research_demo/frontend/src/styles/global.css abk-01/sonola-dashboard/src/assets/hooks/useStepNavigation.ts

Responsive & Cross-browser

3/10

Works on all screens and browsers

Reasonable responsive work with media queries and prefers-color-scheme but no sign of advanced fluid layout techniques, container queries, RTL readiness or explicit feature-detection strategies.

Evidence

abk-01/research_demo/frontend/src/styles/global.css abk-01/sonola-dashboard/sonola-frontend/src/index.css abk-01/weather-app1/app/globals.css

Performance Optimization

5/10

Speed of the interface

Clear practical performance work: client-side throttling and lazy-loading, server-side batching/persistence, and a Vite plugin to serve heavy mediapipe assets from origin to avoid cross-origin loads; however no measured before/after metrics or bundle-analysis artifacts were provided.

Evidence

abk-01/research_demo/frontend/src/hooks/useGazeTracking.js abk-01/research_demo/backend/src/socket/index.js abk-01/research_demo/frontend/vite.config.js

Accessibility & Semantics

3/10

Usable for everyone

Basic accessibility consideration exists such as focus-visible styles and reduced-motion support, but there is little evidence of ARIA on custom widgets, keyboard focus management for interactive gaze-driven UI, or automated a11y checks in CI.

Evidence

abk-01/sonola-dashboard/sonola-frontend/src/index.css abk-01/sonola-dashboard/sonola-frontend/src/App.css abk-01/research_demo/frontend/src/styles/global.css

State Management & Data Flow

5/10

Managing data in the app

Strong server-client state discipline and dataflow for a real-time system: zod request validation, a BehaviorAnalyzer stateful processor, socket session maps, batching and resilient persistence; shows practical handling of race/cancellation at the hook and socket levels but lacks formal request-cancellation APIs (AbortController) or documented cache invalidation strategy.

Evidence

abk-01/research_demo/backend/src/services/behaviorAnalysis.js abk-01/research_demo/backend/src/socket/index.js abk-01/research_demo/backend/src/routes/games.routes.js

UX & Visual Polish

4/10

Look and feel quality

Good visual polish and UX touches such as gaze-dot feedback, attention pulse animation and target simplification states, but limited evidence of systematic skeletons, undo/rollback UX, or broad edge-state coverage across the app.

Evidence

abk-01/research_demo/frontend/src/styles/global.css abk-01/sonola-dashboard/sonola-frontend/src/App.css

Expertise

React· Middle

Frontend Architecture & Build Tools· Middle

PWA & Web APIs· Middle

Industries

Education· Middle

Technologies

TypeScript· since 2025 · Middle

Node JS· Middle

Tailwind CSS

Next.js

Express

Socket.IO

React.js

Vite

Axios

Zod

Recharts

React Router

Recommendations

Develop real-time interactive features that integrate WebSocket streams, behavioral analysis, and adaptive UI for education or assistive products.
Own frontend architecture and build tooling work such as Vite plugins, asset handling and client-side lazy-loading strategies for media-heavy apps.
Implement accessibility audit and keyboard/ARIA handling for custom gaze-driven widgets and add automated a11y checks to CI.
Add end-to-end and unit test coverage around the BehaviorAnalyzer state machine, socket flows and API surface to increase robustness.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

research_demo weather-app1 sonola-dashboard

Middle QA Engineer Confidence: Medium Generalist

Backend and full-stack developer focusing on web applications and e-commerce at a middle level with practical service-layer and API design experience. The strongest proven skill is backend service design and domain logic, evidenced by service classes such as RecommendationService.java which implement a collaborative-filtering style recommendation algorithm and Product/Order/User service layers. Tests, CI integration, contract tests, and formal QA artifacts are not evidenced in public code and there is limited coverage of negative-path or property-based test design.

Test Automation Frameworks

1/10

Building automated tests

Minimal test automation artifacts; only frontend test script hints and client-side validation present, no custom fixtures or test infra.

Evidence

ecommerce_java/ecommerce-frontend/package.json: contains "test" script using react-scripts test

game-store-repo/GameStore.Api/wwwroot/app.js: client-side validation and fetchJson error handling (indicates basic QA thinking)

Test Coverage & Strategy

1/10

What and how to test

No visible risk-based test strategy, negative-path tests, or property-based tests; only generic frontend test script and linting present.

Evidence

ecommerce_java/ecommerce-frontend/package.json: 'test' script exists but no test suites observed in provided files

sonola-dashboard/sonola-frontend/package.json: project scripts include lint and build but no test suites

API & Integration Testing

1/10

Testing how parts work together

APIs are implemented and client code exercises them, but there is no contract testing, schema validation, or integration test harness present.

Evidence

ecommerce_java/src/main/java/com/ecommerce/controller/ProductController.java: REST endpoints with error handling patterns

game-store-repo/GameStore.Api/wwwroot/app.js: fetchJson wrapper that handles non-OK responses and surfaces server text

Performance & Load Testing

Testing speed under load

Not evidenced in public code

Bug Reporting & Analysis

1/10

Finding and describing bugs

Some engineering hygiene and migration artifacts exist showing refactor intent, but no formal bug reports or RCA documents.

Evidence

game-store-repo/GameStore.Api/Data/Migrations/20250926131247_RenameGenderToGenre.cs: migration and data seeding reflecting a rename/refactor

game-store-repo/GameStore.Api/wwwroot/app.js: fetchJson includes enhanced error text for diagnostics

CI Test Integration

1/10

Running tests automatically

Basic toolchain and lint configuration present but no CI pipelines, test matrix, per-test retries or quarantine mechanics found.

Evidence

sonola-dashboard/eslint.config.js: project ESLint configuration

ecommerce_java/ecommerce-frontend/package.json: frontend scripts (start/build/test) that could be wired into CI

Industries

Commerce· Middle

Gaming· Middle

Sales & Marketing· Junior

Technologies

JavaScript· since 2025 · Middle

Java· since 2026 · Middle

C#· since 2025 · Middle

Spring Framework

ASP.NET Core

Entity Framework Core

Spring Data JPA

Recommendations

Develop and maintain backend microservices for e-commerce features such as product, order, and recommendation APIs using Spring Boot and layered architecture.
Implement API contract tests and integration test suites (schemathesis/pact or schema-driven tests) around existing controllers like ProductController to raise confidence in breaking changes.
Build small frontend integrations and end-to-end flows for React/Vite apps, focusing on resilient client-server interactions and replacing simple alerts with structured error handling and test hooks.
Implement CI pipelines that run unit tests, linting, and API contract checks and add per-test retry/quarantine policies for flaky integration tests.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

ecommerce_java game-store-repo sonola-dashboard