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Junaid Aziz

@junaidaziz

Message

Senior full-stack engineer building production LLM systems and RLHF evaluation.

Pakistan

Message

What I'm looking for

I’m looking for senior full-stack or AI-product work where I can ship production LLM systems and build robust evaluation/RLHF pipelines, improving performance and reliability end to end with strong engineering rigor.

I’m a senior full-stack engineer with 10+ years across Node.js, TypeScript, React/Next.js, and AWS Serverless. I’m currently contracting as an AI Training Engineer on Mercor, where I evaluate frontier-model code for clients including OpenAI and Anthropic.

I build production LLM systems end to end—RAG pipelines, OpenAI and Claude orchestration, pgvector, and Function Calling—while also evaluating AI-generated code for RLHF. I focus on structured feedback writing, comparative failure mode analysis, and rigorous correctness/efficiency/security review.

Previously, at Modus Create, I led the full-stack build for Audi Business Innovation’s React operator dashboard on a Node.js/NestJS serverless backend, cutting API latency 25% and lifting throughput 60%. I also integrated OpenAI and Claude APIs into Midpage’s legal-research platform, achieving 99.9% uptime, and I’ve consistently improved reliability through CI/CD, TDD, and secure, event-driven architectures.

Experience

Work history, roles, and key accomplishments

Current

AI Training Engineer

Current

Mercor

Feb 2026 - Present (4 months)

Evaluate frontier LLM code for clients including OpenAI and Anthropic by writing and reviewing complex Python, JavaScript/TypeScript, and Go solutions. Produce structured RLHF feedback via comparative failure-mode analysis, trajectory tagging, and correctness/efficiency/security assessments.

Trajectory Record Tagging Structured Feedback OpenAI API Anthropic Claude API Correctness And Security Review

Current

Senior Full-Stack Engineer

Current

Modus Create Inc

Dec 2022 - Present (3 years 6 months)

Led full-stack architecture for Audi Business Innovation’s React operator dashboard and Node.js/NestJS serverless backend, reducing API latency 25% and operational latency 20%. Integrated OpenAI and Claude APIs (function calling/tool use, streaming), improved uptime to 99.9%, and cut production bugs 25% through CI/CD, TDD, and security hardening.

React Next.js NestJS AWS Serverless SQS SNS Event Driven Architecture OpenAI And Claude Integrations

Senior Full-Stack Engineer

X-Team

May 2020 - Jan 2023 (2 years 8 months)

Architected a real-time React + WebSocket infrastructure for a 20K+ monthly-user platform, cutting client sync delays 40% by removing polling. Built and maintained high-throughput REST/GraphQL backends with React clients, improving reliability with Redis caching and 95%+ test coverage.

React WebSockets NestJS GraphQL REST APIs Redis PostgreSQL MongoDB Test Coverage

Technical Lead & Full-Stack Engineer

Kwanso

Apr 2016 - Feb 2020 (3 years 10 months)

Mentored 10+ engineers through code reviews and engineering standards, reducing tech debt 40%. Built and scaled a full-stack SaaS from scratch and improved deployment time 30% and backend throughput 20% using Docker/Kubernetes, CI/CD automation, and Node.js/NestJS/TypeScript services.

TypeScript React Vue.Js Docker Kubernetes CI CD MySQL MongoDB