# Abhilash Bera

> Full Stack Developer & Product Engineer building digital products, SaaS systems, and mobile applications from idea to production.

## About Abhilash Bera

- **Name**: Abhilash Bera
- **Role**: Full Stack Developer & Product Engineer
- **Location**: India (Available for Remote worldwide)
- **Status**: Available for select freelance, contract, and product engineering work
- **Website**: https://www.abhilashcodes.dev
- **Email**: abhilashbera2003@gmail.com
- **GitHub**: https://github.com/abhilash2616
- **LinkedIn**: https://www.linkedin.com/in/abhilashbera/
- **X (Twitter)**: https://x.com/abhilash_003

I work end to end — architecture, user interface, APIs, databases, and deployment. Most of what I build is a system someone depends on daily, ranging from multi-tenant SaaS platforms and analytics query engines to offline-first mobile apps and AI-powered retrieval systems.

## Primary Skills & Technologies

- **Frontend**: Next.js, React, TypeScript, Tailwind CSS, Framer Motion, GSAP
- **Backend & APIs**: Node.js, Express, Fastify, REST APIs, GraphQL, Queues (BullMQ)
- **Databases & Data**: PostgreSQL, ClickHouse, Redis, Prisma, pgvector
- **Mobile**: React Native, Expo, SQLite, Offline Sync
- **AI / ML**: LLM APIs, RAG, Hybrid Retrieval (pgvector + keyword search), Semantic Chunking
- **Infrastructure & Tools**: Docker, AWS (ECS, S3), Git, GitHub Actions, Vercel

## Featured Projects & Case Studies

- [Marketing Automation SaaS](https://www.abhilashcodes.dev/work/marketing-automation-saas): Multi-tenant platform connecting 6+ ad platforms over OAuth, normalizing advertising metrics into a unified schema, and automating scheduled reports (Dashboards, PDF, Email). Replaced ~4 hours of manual weekly reporting. Stack: Next.js, Node.js, PostgreSQL, BullMQ, Redis, OAuth 2.0.
- [Commerce Analytics Platform](https://www.abhilashcodes.dev/work/commerce-analytics-platform): Self-serve ecommerce analytics engine providing cohort grids, customer retention analysis, and revenue attribution across 40M+ events with sub-second (<1s P95) query performance using ClickHouse and Fastify. Stack: Next.js, TypeScript, ClickHouse, Redis, D3.
- [Field Operations Mobile App](https://www.abhilashcodes.dev/work/field-operations-app): 100% offline-first React Native & Expo mobile application for inspection crews. Captures forms, photos, and signatures to local SQLite, with opportunistic sync and field-level conflict resolution. Cut turnaround from 1 day to live. Stack: React Native, Expo, SQLite, Node.js, PostgreSQL, S3.
- [Payments & Billing API](https://www.abhilashcodes.dev/work/payments-billing-api): Production subscription billing service with an immutable append-only ledger, usage metering, proration engine, idempotent Stripe webhooks, and explicit dunning state machine. Zero duplicate charges and +18% failed payment recovery. Stack: Node.js, Express, PostgreSQL, Redis, Stripe.
- [AI Support Assistant](https://www.abhilashcodes.dev/work/ai-support-assistant): Documentation-grounded support assistant using hybrid retrieval (pgvector + keyword search) with reranking, streaming citations, and human-agent handoff for low-confidence queries. Self-resolves ~65% of routine questions. Stack: Next.js, Python, FastAPI, pgvector, PostgreSQL.
- [Component Library & Design System](https://www.abhilashcodes.dev/work/component-design-system): Unified design token pipeline and accessible headless component library across 4 product teams with automated visual regression tests and semantic versioning. Stack: React, TypeScript, Tailwind CSS, Storybook, Vitest, Playwright.

## Work Experience

- **Full Stack Developer — Digital Wolf (2024 — Present)**:
  Architecting and delivering full-stack web platforms and backend services. Engineered solutions across Node.js, NestJS, PHP, Next.js, React, and Vue.js; designed normalized SQL and PostgreSQL databases; built robust REST APIs and integrations; reduced application load times by 45% using Next.js optimization and caching. Stack: Next.js, React, Vue.js, Node.js, NestJS, PHP, PostgreSQL, SQL, REST APIs, TypeScript, Tailwind CSS.
- **Frontend Developer Intern — Digital Wolf (2024)**:
  Shipped 5+ client web projects and custom Shopify themes with mobile responsiveness, cross-browser compatibility, and Core Web Vitals optimization. Stack: React, JavaScript, Tailwind CSS, Shopify, HTML5/CSS3.
- **Full Stack Developer — Independent · Product Engineering (2023 — Present)**:
  Building production web applications, SaaS platforms, and digital products end to end. Designed data ingestion pipelines, normalized database schemas, and robust REST APIs. Stack: Next.js, Node.js, PostgreSQL, React Native, AWS.

## Full Documentation & Details

- [Full Portfolio Context (llms-full.txt)](https://www.abhilashcodes.dev/llms-full.txt): Comprehensive documentation including problem statements, technical solutions, architecture layer breakdowns, and verified metrics for every project.