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Md Shihab Hossain

@mdshihabhossain

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QA Engineer at a YC-backed AI startup who traced incorrect LLM summaries to an input-truncation bug.

Bangladesh

Message

At YC-Backed AI Startup (Confidential), I test LLM developer tools on open-source codebases and file reproducible bugs. I traced incorrect summaries to an input-truncation bug affecting 29 of 48 reports and validated the fix with tests.

At Springer Capital, I architected and deployed Node.js and Python microservices and REST APIs for real estate valuation and cash flow modeling. I optimized PostgreSQL schemas and implemented asynchronous processing with Redis queues to reduce underwriting query latency.

In my projects, I built DevChat, a real-time developer chat platform with database-level authorization and streamed AI code explanations, and Cogniflow AI, a browser-based multimodal RAG engine. I also built a Python scanner for AI-built apps that checks security and configuration issues.

Experience

Work history, roles, and key accomplishments

Current

QA Engineer

Current

YC-Backed AI Startup (Confidential)

Oct 2026 - Present (1 month)

Tested LLM developer tools end-to-end on open-source codebases, filed reproducible bugs, and validated fixes. Ran the TypeScript/Bun monorepo locally to reproduce issues and run unit and integration tests.

TypeScript Bun Unit Testing Integration Testing Bug Reporting LLM Testing QA

Backend Software Engineer Intern

Springer Capital

Aug 2026 - Oct 2026 (2 months)

Architected and deployed high-throughput Node.js/Python microservices and RESTful APIs for real estate asset valuation and cash flow modeling. Optimized PostgreSQL schemas and implemented asynchronous task processing with Redis queues.

NodeJS Python Microservices REST APIs PostgreSQL Redis Asynchronous Processing

Research Assistant

NSU HCI-DIAL (Human-Computer Interaction Lab)

Dec 2025 - Sep 2026 (9 months)

Conducted qualitative B2B user research, structured interviews, and thematic analyses, translating user challenges into accessibility requirements. Collaborated with cross-functional teams to prototype inclusive UI features and co-authored research manuscripts.

Qualitative Research User Interviews Thematic Analysis Accessibility Prototyping Research Collaboration

GTM & Product Consultant

Reputationaire

Feb 2026 - May 2026 (3 months)

Designed a zero-cost 90-day GTM strategy targeting UK and Australian tech recruitment agencies, creating cold outreach sequences and developer sourcing workflows. Conducted product/UX audits and recommended a business model pivot to a B2B SaaS subscription model.

GTM Strategy Cold Outreach Product Audits UX Audits Lead Generation B2B SaaS

AI Data Trainer (Coding & Reasoning)

Outlier AI

Mar 2024 - Nov 2024 (8 months)

Evaluated and refined LLM code generation and logical reasoning outputs, delivering detailed feedback on correctness and quality. Designed model evaluation guidelines and simulated LLM-as-a-Judge frameworks to audit response correctness and code security.

LLM Evaluation TypeScript Python Reasoning Code Security Evaluation guidelines

Education

Degrees, certifications, and relevant coursework

North South University

Bachelor of Science, Computer Science and Engineering

2022 -

Pursuing a Bachelor of Science in Computer Science and Engineering, with coursework in data structures, algorithms, database systems, software engineering, machine learning, and neural networks.