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Biswajit Roy

Open to work3 years experience

Full Stack Engineer

Jalpaiguri, IndiaTarget Roles: Backend Engineer • Full-Stack Developer • Frontend Specialist

Full Stack Engineer | React / Next.js / Node.js | AI & LLM Integrations

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Standing Rank

Rank Not Available

Developer Badges

Badges Pending

Skills & Technologies

36 skills
javascripttypescriptpythonhtml5css3reactnext.jstailwind csswcag 2.1 aanode.jsexpress.jsrest apiwebsocketsjwt authbullmqfastapirag pipelineslangchainpineconeopenai apigroqgemini flashprompt engineeringmongodbpostgresqlredismysqlsqlitegitgithubvercelci/cdplaywrightdockerjiraagile/scrum

Work Experience

Full Stack Engineer

The Brandwick

Mar 2023 - Mar 2026 West Bengal, India
  • Architected Next.js (App Router) applications with per-route rendering strategies (ISR/SSG/SSR), improving Core Web Vitals by 20% and achieving LCP under 2.5s across key routes.
  • Built a reusable React component library of 30+ components with strict TypeScript interfaces, reducing runtime errors by 25% and accelerating cross-team feature delivery.
  • Engineered centralised Axios interceptor layer handling JWT refresh, error normalisation, and request deduplication - cut API boilerplate by 40%.
  • Integrated 100+ Playwright end-to-end tests into CI/CD pipelines, reducing post-release regressions by 30% across Scrum sprints.
  • Implemented WebSocket real-time messaging UI with sub-200ms latency; authored REST API contracts and JSON schemas in collaboration with backend engineers.
  • Qoka: Led full stack development of a UK digital marketplace with smart contract acceptance flow and real-time messaging across 24 service categories; 10,000+ active users.
  • Vastu Wisdom: Built international booking platform with location-aware routing (India vs. Dubai) and e-commerce storefront; 5,000+ monthly bookings.

Projects

AI Knowledge Assistant - RAG System

View Project
Next.jsTypeScriptLangChainPineconeGemini FlashGroqNode.js
  • Built full RAG pipeline covering document ingestion, sentence-aware chunking, embedding generation, and semantic retrieval via Pinecone; achieved sub-500ms retrieval on a 10,000+ document corpus.
  • Benchmarked Groq, Gemini Flash, and OpenAI on latency vs. cost; selected Gemini Flash, cutting per-query inference cost by 40% while maintaining quality. Implemented streaming responses for real-time UX.

Resume Analyzer SaaS - ATS Scoring Tool

View Project
Next.jsTypeScriptOpenAI APICloudflare R2Node.jsExpress.js
  • Iterated prompt design 15 times - adding persona, output format, and scoring rubric - producing actionable hirability scores and keyword gap analysis, eliminating generic LLM output.
  • Added preprocessing layer to compress resume text before API calls, reducing token usage and average analysis time by 35% (from 8s to under 5s).

Leaderboard Standings

Leaderboard Position Pending

Global test scores, peer standing percentiles, and algorithm leaderboard ranks are updated dynamically.

Assessment Highlights

Assessments Not Completed

Coding evaluations, system assessment results, and conceptual score badges will appear here after taking a test.

AI Collaboration Score

AI Collaboration Score Pending

Developer coding behavior, assistant cooperation, and AI pair-programming indicators are evaluated during live coding sessions.

Role Compatibility Profile

Role Compatibility Analysis Pending

Custom matching reports, candidate role compatibility percentiles, and core engineer strength profiles are processed once conceptual code screenings are complete.

Achievements

Achievements Not Earned

Special rewards, developer badges, system recognition certificates, and conceptual milestones will display here.

About Details

Professional Bio

Full Stack Engineer with 3 years of experience building production-grade React/Next.js frontends and Node.js/Express backends. Delivered AI-integrated systems including RAG pipelines, LLM APIs, and vector search. Owns features end-to-end from architecture to deployment.

Certificate in Computer Software Engineering

Masai School ( - Present)

B.Sc. in Zoology

University of North Bengal ( - Present)

Languages: English, Hindi
Email: Locked