💻 Full-Stack Engineer  |  🤖 AI Evaluation & LLM Specialist  |  🌍 Lifelong Learner

I'm a full-stack software engineer who also works on the AI side of things — evaluating LLM outputs, ranking model responses, and writing structured feedback that feeds back into model training. I built PayloadGrid, an API payload generation and testing platform, end to end in React, TypeScript and Node.js, and I bring 3+ years of applied QA experience, so I ship features that are actually tested, not just built.

• 🔭 Currently building: PayloadGrid — an API payload generation & testing platform
• 🧠 Recently: 200+ hours evaluating LLM outputs (coding, math, reasoning) for Mercor Intelligence — RLHF-style ranking, hallucination/factuality checks, structured feedback
• 🌱 Currently learning: StackIT, C, AWS Cloud, systems-level Linux (42 Heilbronn)
• 💬 Ask me about: Web development, REST APIs, LLM evaluation & prompt engineering, QA/testing
• 📫 Reach me at: jaybhinsara9@gmail.com
• ✅ Availability: Immediate joiner, open to relocation across India or remote

Languages JavaScript TypeScript Python C SQL Bash

Frontend React HTML5 CSS Responsive UI

Backend & APIs Node.js Express.js REST API Design Request Validation Error Handling

Databases MySQL PostgreSQL Neon Supabase Redis

Cloud & DevOps AWS Vercel Linux (Ubuntu) / VPS DNS SSL Git GitHub Actions CI/CD

AI & Evaluation LLM Output Evaluation RLHF-style Ranking Prompt Engineering Data Annotation PyTorch (foundational)

QA & Testing Functional Regression Exploratory UI Testing Defect Reporting

Software Engineer — Full-Stack · PayloadGrid, Heilbronn, Germany · 2026 – Present Built PayloadGrid end to end (frontend, backend, deployment) with React/TypeScript and Node.js/Express, including REST API design, validation and error handling.

AI Engineer / LLM Evaluation Specialist (Contract) · Mercor Intelligence · Jan 2026 – Aug 2026 200+ hours evaluating AI-generated responses across coding, math, reasoning and general-knowledge domains; RLHF-style ranking, structured feedback, prompt refinement. Recognised as Excellent Performer of the Month.

QA Engineer (Freelance) · uTest / Test IO · 2022 – Present Functional, regression, exploratory and UI testing across web/mobile apps, with reproducible defect reports and evidence collection.

Technical Specialist & Operations Manager · McDonald's, London, UK · 2022 – 2025 Led a 25-person team; primary technical contact for internal applications and operational systems.

🎓 MSc Software Engineering, University of West London (UK) · Core Student, Software Engineering, 42 Heilbronn (Germany) · BSc Information Technology, P.P. Savani University

A web platform for generating, managing and testing API payloads — built end to end (frontend, backend, deployment) in React, TypeScript and Node.js/Express, with REST API design, request validation and error handling. 👉 github.com/jaybhinsara/payloadgrid

A digital challan/invoice register app. 👉 repo link coming soon

A modern van rental web app built with React, React Router, and MirageJS. Simulates a van rental platform where users can browse available vans, view details, and manage listings as a host — built with a mock backend for learning and demonstration purposes. 👉 github.com/jaybhinsara/vanlife

A modern, animated portfolio built with React, Vite, and Framer Motion. Fully responsive, themeable, and optimized for fast deployments. 👉 github.com/jaybhinsara/Portfolio-Site

A cryptocurrency dashboard application for tracking and analyzing digital assets in real time. 👉 github.com/jaybhinsara/Crypto_dashboard

Provisioned and administered a Linux VPS hosting multiple production websites — DNS, SSL, deployments and ongoing maintenance.

MSc thesis project: an event-driven IoT automation platform using MQTT/HTTP to connect sensors and backend services, evaluated on reliability, latency and scalability.

LinkedIn • GitHub • Email • Portfolio

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