The stack, and how deep each part goes.

React.js · Next.js · TypeScript · JavaScript (ES6+) · Angular · Redux / Saga · Tailwind CSS · HTML5 & CSS3

Component architecture that survives a growing team: typed props, isolated state, code-split routes, and Core Web Vitals treated as a build-time budget rather than a post-launch clean-up.

Node.js · Express.js · NestJS · REST APIs · Serverless · Microservices · WebSocket & SSE · PHP

Services split along business seams, not technical ones. Idempotent write paths, queue-backed background work, and streaming transports (SSE and WebSocket) where polling would fall over.

MongoDB (incl. Atlas Vector Search) · MySQL · DynamoDB · Redis · aggregation pipelines · caching strategy

Schema design driven by read patterns, aggregation pipelines instead of application-side joins, and a cache layer with explicit invalidation rules rather than hopeful TTLs.

OpenAI / GPT · LangChain · RAG pipelines · embeddings & semantic search · content and voice automation

Retrieval-augmented generation built on real evaluation: chunking tuned to the corpus, vector search over MongoDB Atlas, guardrails on output, and a human review step wherever the output is published.

AWS (Solutions Architect Associate coursework) · Docker · CI/CD · Git · Linux · Agile / Scrum

AWS-certified architecture with containerised services, pipeline-gated deploys, and observability wired in before launch — logs, metrics and alerts that name the failing component.