Hi... This is.
AMBUJ KUMAR
Full-Stack Developer | ML & QA Engineer
Computer Science undergraduate bridging the gap between robust software engineering and AI innovation. Specializing in scalable .NET architectures, precise QA automation, and fine-tuning language models to build intelligent, production-ready systems.
Professional Experience
QA & Testing Engineer (Freelance)
The Raw Advantage (US Client via Truelancer)
Aug 2024 – Sept 2024
- Managed full WordPress maintenance workflow, including plugin updates, staging environment setup, backups, and safe deployments.
- Performed comprehensive QA testing using BugBug for complex e-commerce checkout flows, CRM onboarding, and membership access.
- Tested Stripe payments, discount codes, and order workflows to ensure site stability and revenue continuity post-updates.
AI Quality Analyst (Freelance)
Outlier AI
Jan 2025 – Feb 2025
- Evaluated AI-generated responses for C++, Mathematics, and Python to ensure technical accuracy and logical clarity.
- Delivered structured feedback to enhance LLM reasoning, algorithmic problem-solving, and code generation quality for training datasets.
Competitions & ML Research
Google Tunix Hackathon Participant
Kaggle | LLM Fine-Tuning
Nov 2025 – Jan 2026
- The Challenge: Fine-tuned Google's Gemma 2-2B to explicitly generate logical reasoning traces before answering complex prompts.
- The Architecture: Engineered a lightweight Reinforcement Learning (RL) pipeline using Tunix (Google's JAX-native library) and GRPO (Group Relative Policy Optimization) to bypass memory constraints on a single TPU v5e node.
- The Optimization: Designed a custom compound reward function to enforce structural logic across a mixed dataset (Math, Science, Code), while managing XLA compiler settings to prevent memory fragmentation.
JAX
Google Tunix
Gemma 2
Reinforcement Learning
TPU v5e
Featured Project
Kansatiate
Full-Stack Food Delivery Application
Sep 2023 – Present
- Engineered a highly interactive food delivery platform featuring custom cravings, gallery views, reviews, and complex ordering workflows.
- Architected a robust enterprise backend using C# and .NET connected to a SQL Server database, ensuring data integrity and high-performance querying.
- Integrated the backend API with a modernized Next.js 14 frontend for optimal routing efficiency, SEO, and seamless user experience.
Next.js 14
C# / .NET API
SQL Server
TypeScript
Tailwind CSS
Tech Arsenal & Certifications
Core Technologies
C/C++
C# / .NET
Python
JavaScript/TS
React / Next.js
SQL Server
AWS & GCP
Docker
Key Certifications
- Oracle Cloud Generative AI Professional
- UiPath Student Automation Developer
- NPTEL Cloud Computing
- Coursera Software Engineering
Digital Footprint
Interactive Side Quests
IN DEV