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Available for ambitious projects

Hi, I'm
Biswas Pun

I build scalable web apps, AI-powered platforms and intelligent automation.

View experience Get in touch
agent.ts — running

const agent = new RAGAgent({

model: "claude",

vectorDB: "pgvector",

});

await agent.run("build something great");

→ Retrieving context...

→ Reasoning across 128 sources...

✓ Ready to ship._

6+Years experience
35K+Active users served
10K+Daily API requests
99%+Uptime
40%+Faster page performance

01 / About

Engineering products that think, scale, and last.

Nuneaton, United Kingdom

6+ years in production

Senior Full Stack Engineer building scalable web applications, AI-powered platforms and cloud software. Skilled in React, Next.js, TypeScript, Node.js, Java, Spring Boot and Python.

Experienced in LLM integrations, RAG pipelines, AI agents and intelligent automation, with a strong background in Shopify and headless e-commerce.

02 / Capabilities

What I do

From intelligent systems to high-performing storefronts, I build across the stack with a product-first mindset.

01 / INTELLIGENCE

AI Engineering

LLM apps, RAG, AI agents, semantic search, and local models with Ollama.

02 / ENGINEERING

Full Stack Development

React, Next.js, Node.js, NestJS, Spring Boot, and scalable APIs.

03 / COMMERCE

Headless Commerce

Shopify Plus, Hydrogen, Storefront API, custom apps, and integrations.

04 / OPERATIONS

Cloud & DevOps

AWS, Azure Functions, Docker, Kubernetes, and reliable CI/CD.

03 / Experience

Building through every layer.

Senior Full Stack & AI Engineer

Current

Self Employed

  • Built AI apps integrating OpenAI, Anthropic and local LLMs with RAG pipelines, embeddings and vector search.
  • Shipped real-time streaming AI chatbots and REST APIs handling 10,000+ daily requests.
  • Created reusable frameworks cutting feature development time by 35%+.
  • Delivered Azure Functions, Docker and CI/CD systems achieving 99%+ availability.
  • Built integrations that reduced manual workflows by 60%+.
OpenAIAnthropicRAGAzureDocker

Full Stack Engineer

Gafaro · Sheridan, US

  • Built full-stack products serving 35,000+ active users with React, Next.js, Node.js, Spring Boot and PostgreSQL.
  • Designed microservices with NestJS and Spring Boot, plus secure JWT, OAuth and RBAC authentication.
  • Delivered AI-powered features using LLM APIs and headless commerce with Hydrogen and Shopify Storefront API.
  • Improved frontend performance by 40%+ and reduced release effort by 50% through CI/CD.
Next.jsTypeScriptNestJSSpring BootPostgreSQLShopify

Full Stack Developer

Nicolas Lavrow Studio · London, UK

  • Built Shopify storefronts, themes and reusable sections with Liquid.
  • Integrated Admin API, Storefront API, GraphQL, payments, shipping and analytics.
  • Reduced storefront load times by 35%+ and delivered 20+ production features.
ShopifyLiquidGraphQLJavaScriptStorefront API

04 / Stack

Tools I trust in production.

AI Engineering

OpenAI APIAnthropic APILLMsRAGAI AgentsPrompt EngineeringEmbeddingsVector DatabasesOllamaLlama

Frontend

TypeScriptReactNext.jsTailwind CSSRedux

Backend

Node.jsExpressNestJSPythonFastAPIGoJavaSpring BootGraphQLWebSocketsMicroservices

E-commerce

Shopify PlusLiquidHydrogenStorefront APIAdmin API

Databases

PostgreSQLMySQLMongoDBRedisElasticsearchPrismaTypeORM

Cloud & DevOps

AWSAzureDockerKubernetesGitHub ActionsNginx

05 / Education

A commercial foundation for technical work.

BA Accounting and Finance | Computer Science Studies

Birmingham City University

Additional training in Agile, Scrum and Software Development Practices.

2016 — 2019

06 / Contact

Let's build something intelligent.

Have a product, platform, or ambitious AI idea? I'd love to hear about it.

biswaspun88@gmail.com
Nuneaton, UK