Product Engineer

Building software that
actually works at scale.

I'm K N Anantha Nandanan — a software engineer focused on scalable backend systems, DevOps, and applied AI. Currently building QuestCraft, an LLM-powered platform that helps teachers create better assessments, faster.

I write about things I learn, systems I build, and patterns worth sharing.

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Writing

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Sep 14
What Building Reigner Taught Me About Context, Cost, and TrustReigner began as an attempt to make document Q&A agents cheaper, more traceable, and easier to understand. Building it changed how I think about orchestration, retrieval, citations, and where model capability is worth spending.
ai-agents llms harness-engineering rag evals python open-source
May 4
From Prompt Engineering to Harness EngineeringA practical reflection on why reliable AI agents depend less on clever prompts and more on the harness around them - ingestion pipelines, intentional knowledge representations, tool design, orchestration, role policy, and verifiable outputs.
ai-agents llms prompt-engineering harness-engineering rag tooling knowledge-base
May 3
Setting Up a Hetzner VPS with CoolifyA step-by-step guide to provisioning a Hetzner VPS using the Coolify marketplace image, hardening SSH, configuring DNS and HTTPS, locking down the firewall, and deploying your first app.
self-host coolify hetzner devops linux
Mar 3
The Anatomy of a Bulletproof Pitch - 5 Lessons from Presenting QuestCraftA practical guide on what I learned about crafting and delivering a compelling pitch deck, from structuring slides to handling the Q&A.
presentation startup saas pitch-deck lessons-learned
Dec 29
Your Users Will Break Your App (and That’s a Good Thing)Real users don’t behave like test cases, and that’s where the real learning begins. This blog explores how user feedback and unexpected behavior shape better UX and a stronger SaaS product.
SaaS UX user feedback product development startup
Dec 28
VPS Setup ChecklistThis is a blog on the general checklist that I have come to follow while setting up a VPS
basics linux setup self-host

Projects

All projects →

published

Reigner

Open-source Python harness for citation-faithful question-answering agents, with bounded context, cost-aware model escalation, and evaluation built in.

PythonFastAPIPydanticLLM AgentsSSEPyPI

published

Json To Many

Zero-dependency Python library and CLI for converting JSON into Markdown, XML, CSV, and HTML, with typed results and reusable templates.

PythonClickPyPIuvRuffTyped API

repository

Reg-Exp-Lain

Interactive regular expression visualizer for exploring flow diagrams, testing strings in real time, and stepping through matches.

Next.jsReact 19React FlowTypeScriptTailwind CSSZustandregjsparser

live

My Website

Personal publishing platform with an MDX content pipeline, tag archives, static article pages, and a custom editorial design.