Bibak RoySenior Frontend Engineer

Obsessed with performance. Built for scale.

Senior Frontend Engineer with 6 years of expertise in React & TypeScript, currently leading a team of 5+ engineers. Experienced in large-scale migrations, performance optimization, and scalable frontend development.

  • React
  • TypeScript
  • Next.js

About

Six years of React and TypeScript. Large-scale migrations, performance work and production apps shipped end to end — now leading a team of 5+ engineers.

~/bibak — zsh

whoami

Bibak Roy — Senior Frontend Engineer

cat about.md

Senior Frontend Engineer with 6 years of expertise in React & TypeScript, currently leading a team of 5+ engineers. Experienced in large-scale migrations, performance optimization, and scalable frontend development. High emphasis on boosting system efficiency with a proven record of 65%, leading to a 10x increase in customer satisfaction and millions in monthly revenue. Driven to architect high-performance frontends, achieving a 5x growth in user engagement and a 28% spike in customer acquisitions.

echo $STACK

react typescript next.js tailwind node

6yrs

Years of experience

5+

Engineers led

65%

Performance improvement

28%

Growth in sign-ups

5x

User engagement growth

10x

Customer satisfaction

The toolkit.

Languages, frameworks and tools I use to take products from first commit to production.

Languages

TypeScriptJavaScriptPythonC++

Frontend

React.jsNext.jsViteReact NativeReduxZustandTanStack QueryHTML5CSS3Tailwind CSSSASS/SCSSMaterial UI

Backend

Node.jsExpress.js

Databases

MySQLPostgreSQLMongoDBFirebase

Tools & Others

ExpoOpenAI APIsDockerGraphQLWebSocketJestCypressCI/CDWebpackBabelGitJiraPrisma

Shipping since 2021.

From Bangladesh to remote teams in the US and Singapore — five roles, one focus: frontends that perform.

  1. currentJune 2025 - Present

    Senior Frontend Engineer

    Data Tree Technology, USA (Remote)

    • Building a scalable solution for Kinetik's digitally integrated healthcare system, enabling seamless workflows across NEMT (Non-Emergency Medical Transportation).
    • Contributing to the Trip Scheduler product through patient and transportation provider management, trip scheduling, driver dispatch, claims tracking, & transparency dashboards for health plans & transportation providers.
    • Enhancing performance and reducing UI latency by 40% through optimized rendering, memoization, code splitting, and lazy loading.
    • Developing a labeling system for Patients, Trips, Transportation Providers, Notes, & Documents with advanced filtering/search.
    • Contributing to CI/CD workflows, participating in code reviews, & ensuring smooth deployment of new features with zero downtime.
  2. June 2023 - May 2025

    Senior Frontend Developer

    Supertal PTE LTD, Singapore (Remote)

    • Led the migration of a modular construction management system, Offsight, from Angular.js to React.js, raw CSS to TailwindCSS, and JavaScript to TypeScript, resulting in a 30% improvement in development efficiency and a scalable codebase.
    • Reduced loading time by 65% through optimization, react hooks, and reduced API calls, achieving a 10x boost in user satisfaction.
    • Developed production/labor/order tracking, analytics, a PDF editor like DocuSign, workflow automation, report generation, forecasting & a feature-permission-management system, serving 43 global companies & generating millions of dollars as revenue.
    • Implemented real-time data using Socket.IO, state management with Redux Toolkit, and drag-and-drop with React Beautiful DnD.
    • Introduced agile methodologies, CI/CD pipelines, & unit/end-to-end (e2e) testing to ensure seamless development & deployment.
  3. December 2023 - May 2024

    Frontend Developer

    HockeyStack, USA (Remote, Part-Time)

    • Supported a Y Combinator-funded company by building a visually stunning, pixel-perfect, and high-performance landing page for their Go-to-Market analytics platform, leading to a 28% growth in new user sign-ups.
    • Collaborated with the UI/UX team to ensure seamless design integration with improved navigation features, enhancing overall user experience and accessibility, generating 5x more customer engagement, and reducing bounce rate.
  4. January 2022 - May 2023

    Software Engineer II

    Recruit LLC, Sylhet, Bangladesh

    • Engineered Retune, a tool for building fine-tuned large language models (LLM) with GPT-4 using OpenAI APIs, allowing users to train personalized AI assistants & generate APIs to integrate into their apps as chatbots/agents, serving over 4000 active customers.
    • Integrated Completions & Fine-tuning APIs, designed REST APIs (Next.js backend) & managed MySQL with Prisma.
    • Crafted chat functionality for individuals/groups (Playroom's mobile app), allowing parents of nurseries/preschools to join by invitation, implemented features like photo sharing, calendar event creation, and a map to locate the playgrounds/parks.
    • Led the entire development lifecycle from initial concept through the final deployment of 6 React Native apps using Expo, transforming complex forestry data into intuitive user interface designs, alleviating pain points of 6000+ field workers.
  5. March 2021 - December 2021

    Software Engineer I

    Recruit LLC, Sylhet, Bangladesh

    • Spearheaded the frontend design of Beatbarrow utilizing Flexbox, Grid, and responsive design with SASS, ensuring cross-browser compatibility and building a music and picture upload system, currently engaging over 500 local users.
    • Implemented Next.js SSR & SSG methods for a smooth user experience (UX) and introduced an authentication system with JWT.
    • Facilitated backend (Node.js) with GraphQL and MongoDB and integrated Stripe payment (one-time & subscription).

Selected work.

Products I've built or led, and the difference they made.

01

Kinetik Healthcare System

Scalable solution for digitally integrated healthcare system, enabling seamless workflows across NEMT (Non-Emergency Medical Transportation) with trip scheduling, driver dispatch, and transparency dashboards.

ReactTypeScriptNext.js
  • 40% UI latency reduction

02

Offsight Construction Management

Led migration from Angular.js to React.js, resulting in 30% improvement in development efficiency. Features include production/labor tracking, analytics, PDF editor, workflow automation, and forecasting.

ReactTypeScriptTailwindCSSRedux
  • 65% loading time reduction
  • 43 global companies served

03

Retune - LLM Fine-Tuning Platform

Tool for building fine-tuned large language models with GPT-4 using OpenAI APIs, allowing users to train personalized AI assistants and generate APIs for chatbots/agents.

Next.jsOpenAI APIsMySQLPrisma
  • 4000+ active customers

04

HockeyStack Landing Page

Visually stunning, pixel-perfect, and high-performance landing page for Y Combinator-funded Go-to-Market analytics platform.

ReactNext.js
  • 28% growth in sign-ups
  • 5x customer engagement

05

Playroom Mobile App

Chat functionality for individuals/groups, allowing parents of nurseries/preschools to join by invitation. Features include photo sharing, calendar events, and map integration for playgrounds/parks.

React NativeExpoFirebase

06

Beatbarrow Music Platform

Music and picture upload system with responsive design, Next.js SSR/SSG, JWT authentication, GraphQL backend, and Stripe payment integration.

Next.jsGraphQLMongoDBStripe
  • 500+ local users

Let's build something.Get in touch.

I'm always open to discussing new opportunities, interesting projects, or just having a chat about technology.

roybibak1@gmail.com