currently building hybrid RAG @ uCube.ai

Sumanth G.

AI Backend Engineer

I build AI systems that actually ship — hybrid RAG over 100+ sources, LLM inference engines, and agents that turn hours into minutes.

cd ~/projects

Selected Work

Systems built from first principles — inference engines, RAG platforms, and self-tuning infrastructure.

01 / 04 ~/llm-serving-engine

LLM Inference Engine

Continuous Batching from scratch

A local-first LLM serving engine focused on efficient inference, concurrent scheduling, and real-time streaming.

  • PagedAttention-inspired KV-cache management with continuous batching — serves 8 concurrent requests while cutting memory fragmentation.
  • Adaptive chunked-prefill scheduler that adjusts chunk size to workload pressure, reducing time-to-first-token by 61% on mixed prompts.
  • Trie-based prefix KV cache with LRU eviction & shared prompt reuse — +44% throughput vs sequential HuggingFace inference.
  • Python
  • PyTorch
  • FastAPI
  • Transformers
  • Trie/Radix Cache
View LLM Inference Engine on GitHub
02 / 04 ~/Investment-Intelligence-Platform

Agentic Investment Intelligence Platform

A microservices RAG platform that answers financial questions with AI-backed market & news context.

  • Agentic query router (Qwen-3.5-8B via vLLM) that classifies queries and dispatches between Text-to-SQL and RAG workflows.
  • Hybrid retrieval + cross-encoder reranking over ChromaDB embeddings and PostgreSQL data — 76% top-k accuracy on a 50-company NIFTY benchmark.
  • Semantic caching layer cut repeated-query latency from seconds to milliseconds; Dockerized microservices with parallel news ingestion.
  • Python
  • FastAPI
  • vLLM
  • PostgreSQL
  • ChromaDB
  • Docker
View Agentic Investment Intelligence Platform on GitHub
03 / 04 ~/llm-quantization-lab

LLM Quantization Lab

A quantization toolkit for compressing LLMs with measurable trade-offs.

  • Implements absmax and zero-point quantization from first principles.
  • GPTQ support with GGUF file parsing.
  • Benchmarking dashboard to compare accuracy vs size/speed across methods.
  • Python
  • PyTorch
  • GPTQ
  • GGUF
  • Quantization
View LLM Quantization Lab on GitHub
04 / 04 ~/RL-Driven-Auto-Scaling-Microservices-Orchestrator

RL-Driven Auto-Scaling Orchestrator

A cloud orchestrator that learns to scale heterogeneous microservices from real-time metrics.

  • Uses reinforcement learning (PPO / DQN) to make dynamic scaling decisions.
  • Reacts to real-time load and resource metrics across heterogeneous services.
  • Aims to balance latency and cost without hand-tuned scaling rules.
  • Python
  • Reinforcement Learning
  • PPO/DQN
  • Docker
View RL-Driven Auto-Scaling Orchestrator on GitHub
cat experience.log

Experience

Building production AI systems — from event-driven knowledge graphs to self-learning agents.

  1. uCube.ai

    AI Backend Engineer Jun 2025 – Present
    • Architected an event-driven Neo4j metadata graph for cross-source relationships, enabling hybrid RAG across 100+ sources via lineage & dimension resolution — query latency −68%, 87% accuracy.
    • Built a deterministic graph-based mapping engine between PostgreSQL and Weaviate with intent-aware dimension linking, automating column-level lineage and reducing hallucinations in multi-source queries.
    • Fine-tuned InLegal-BERT with LoRA for sentiment analysis (52% → 80% accuracy) at low compute; added a Neo4j knowledge graph with PageRank reranking to boost RAG retrieval.
    • Built a self-learning multi-agent system (LangChain + Selenium) with an Exploration–Execution loop, collapsing manual workflows into 2-minute automated runs via cached navigation paths.
  2. Sweet Design Hub

    Data Science Intern Jan 2024 – Jun 2024
    • Designed a Time-LLM forecasting model with 89% directional accuracy on Indian & US equities.
    • Built an LSTM volatility model that outperformed GARCH by 7% on market-risk prediction.
    • Fine-tuned a financial-news sentiment engine across 15+ sources — 91% stance-classification accuracy.
whoami --verbose

About

I’m an AI Backend Engineer based in Bengaluru, focused on building production AI — hybrid RAG systems, LLM inference engines, and agentic pipelines. ECE grad from R.V. College of Engineering (2025), Linux enthusiast, and a believer in systems that actually ship.

Education

R.V. College of Engineering, Bengaluru

B.E. Electronics & Communication Engineering

CGPA 9.01 2021–2025

Languages

  • Python
  • C/C++
  • SQL
  • Bash

AI & ML

  • PyTorch
  • Transformers
  • Fine-tuning (LoRA)
  • RAG
  • LLM Agents
  • LangChain
  • LangGraph
  • vLLM
  • SGLang
  • Pandas
  • NumPy

Backend

  • FastAPI
  • REST APIs
  • Microservices
  • Redis
  • Celery
  • Vector DBs
  • PostgreSQL
  • MongoDB
  • AsyncIO

Systems

  • Docker
  • Linux
  • Model Serving
  • Logging
  • Performance Monitoring

Achievements

  • Smart India Hackathon Grand Finale — Top 5 teams (built an asthma-attack detection model).
  • Won Cubestorm — built a pipeline to parse & vectorize Janes PDFs for accurate retrieval.
  • Top 1% in NPTEL Design & Analysis of Algorithms; Top 5% in Data Science.
  • LeetCode: 500+ DSA problems solved, 200+ day streak badge.
cat contact.txt

Let's build something.

Open to roles & collaborations — reach me directly, anytime.