Payment Platform Engineering
Production backend work across payment-adjacent APIs, worker flows, integration boundaries, and reliability improvements, described at the domain level instead of naming sensitive internals.
Backend engineer from Malaysia · AI Researcher · Cloud Adoption DRI
Hello, I'm Puvaan Raaj
Puvaan is a Malaysia-based backend engineer building payment systems, cloud infrastructure, developer tools, and privacy-first AI experiments.
Now
Working on payment-adjacent backend systems, driving AI and cloud adoption at Fiuu, and doing active AI research — reading papers, running experiments, and building personal AI projects. Most days run 12–14 hours. The work and the curiosity are the same thing.
How I Learn
I turn curiosities into tools: local AI assistants, OCR utilities, password/security labs, cloud experiments, and small products that teach the real tradeoffs behind production work.
Thread
My story is mentorship, self-learning, Apple TTP-related enablement, cloud systems, careful writing, and getting better at explaining complex work without leaking the work.
AI AI Tool Adoption DRI CL Cloud Adoption DRI PAY Payment backend systems TTP Apple TTP enablement AWS AWS serverless adoption MQ Queue-driven reliability DX Developer tooling API Production API design WR Technical writing MIC Speaking and workshops AI AI Tool Adoption DRI CL Cloud Adoption DRI PAY Payment backend systems TTP Apple TTP enablement AWS AWS serverless adoption MQ Queue-driven reliability DX Developer tooling API Production API design WR Technical writing MIC Speaking and workshops
AI co-pilot pulse
Token usage is part of the build log.
1910M lifetime tokens across Claude Code and Codex — 586M in the last 30 days ending May 26.
Production focus
Payments
Current DRI
AI + Cloud
Awards
3
Favorite layer
Backend
Work story
A clearer way to explain the experience
AI and Cloud Adoption DRI
Helping teams move from experiments to usable engineering practice: AI-assisted workflows, cloud adoption guidance, documentation, guardrails, and repeatable rollout habits.
Cloud Modernization
Working around containerization, managed compute, serverless patterns, CI/CD, and infrastructure choices that make systems easier to deploy and operate.
Payments Enablement
Supporting payment enablement work at a safe public altitude, including Apple TTP-related delivery, integration readiness, and operational follow-through.
Developer Tools
Small tools, parsers, dashboards, docs, and automation that shorten feedback loops for engineers and make complex systems easier to operate.
AI & Security Experiments
Privacy-first assistants, OCR workflows, post-quantum crypto demos, local LLMs, and applied research notes from building in public.
Selected work
Projects with a point of view
2026
AI Receipt Splitter
Split bills fairly in seconds with AI-powered OCR, multi-currency support, and a stateless privacy-first architecture.
AIClaude VisionGoReactPrivacy
2025
DocuLens - Image to Docx
Transform physical documents into editable Word files using OCR and AI-assisted formatting.
OCRClaudeGoogle VisionDocuments
2026
Quantum-Safe Password Generator
Generate passwords resistant to quantum computer attacks using ML-KEM, Argon2id, Go, Lambda, and WebAssembly.
SecurityGoAWS LambdaWASM
Ghostwrite
2026
Ghostwrite
A Go CLI tool that tracks and attributes AI-generated code in git repositories.
GoGitAIDeveloper ToolsCLI
Personal Assistant RAG
2026
Personal Assistant RAG
A production-grade AI personal assistant using Go, Next.js, Qdrant, AWS S3, Docker, and retrieval-augmented generation.
GoNext.jsRAGQdrantAWS S3DockerAI
Confidential AI Gateway
2026
Confidential AI Gateway
Zero-trust serverless gateway that strips PII before requests reach public AI providers.
GoAWS LambdaKMSNitro EnclavesAISecurity
2026
AI Receipt Splitter
Split bills fairly in seconds with AI-powered OCR, multi-currency support, and a stateless privacy-first architecture.
AIClaude VisionGoReactPrivacy
2025
DocuLens - Image to Docx
Transform physical documents into editable Word files using OCR and AI-assisted formatting.
OCRClaudeGoogle VisionDocuments
2026
Quantum-Safe Password Generator
Generate passwords resistant to quantum computer attacks using ML-KEM, Argon2id, Go, Lambda, and WebAssembly.
SecurityGoAWS LambdaWASM
Ghostwrite
2026
Ghostwrite
A Go CLI tool that tracks and attributes AI-generated code in git repositories.
GoGitAIDeveloper ToolsCLI
Personal Assistant RAG
2026
Personal Assistant RAG
A production-grade AI personal assistant using Go, Next.js, Qdrant, AWS S3, Docker, and retrieval-augmented generation.
GoNext.jsRAGQdrantAWS S3DockerAI
Confidential AI Gateway
2026
Confidential AI Gateway
Zero-trust serverless gateway that strips PII before requests reach public AI providers.
GoAWS LambdaKMSNitro EnclavesAISecurity
Personal operating system
Writing, research, talks, reading, watching
Notebook
Writing & Research
Medium posts, local notes, applied research, and talk drafts in one place.
Research
AI-Assisted Operations Without Losing Control
AI systems
Talks
Elastic Gitlab CI on AWS with Buildkit
Docker Kuala Lumpur
Books
Reasons to Stay Alive
Matt Haig
Movies
Dune: Part Two
Denis Villeneuve
Writing
Recent notes
Apr 18, 2026
Building a Persistent Knowledge Base for Claude Code: From Session Amnesia to Compounding Intelligence
A long-form engineering deep-dive into applying Karpathy's LLM-wiki pattern to Claude Code: transcript-replay auto-updates, Obsidian as source of truth, the honest trade-offs of Graphiti and custom builds, and a full survey of where else a personal knowledge base can live in 2026.
Jan 27, 2026
AI Receipt Splitter: Privacy-First Bill Splitting with Claude Vision
A technical deep-dive into building a stateless, multi-currency receipt splitter using Claude Vision OCR, Go Fiber, and React—with zero user data storage.