YDKJS AI Tutor
Full-stack RAG-powered reading assistant for the 'You Don't Know JS' book series. Features semantic search and contextual Q&A using local LLMs.
Next.jsFastAPIPython+3
Impact: Personal learning tool with RAG architecture
Available for new opportunities
Joshua Enyi-Christopher
Hello
I turn product ideas to code that's reliable, functional & scalable, backed by years of experience with startup & enterprise teams.
terminal
$whoami
Joshua Enyi-Christopher (Chris Josh)
$cat softskill.txt
Communication · Collaboration · Problem Solving · Adaptability
$
About
Engineering at the intersection
of web performance and artificial intelligence
Hi, I’m Chris Josh, a Senior Full-Stack Engineer building performant, scalable, and accessible web applications. I design systems end-to-end, from polished interfaces to backend infrastructure that powers real-world products.
My work now focuses on AI-powered applications — building LLM workflows, RAG systems, and intelligent automation using modern web and AI stacks. I’m particularly interested in applying these systems to solve practical, high-impact problems.
Tech Stack
ReactNext.jsRemixReact NativeExpoTypeScriptTailwind CSSNativeWindStyled ComponentsStorybookNode.jsBunFastifyPythonPostgreSQLRedisPrismaDrizzleBullMQWebSocketsCloudflare WorkersFly.ioOpenAI GPTBAMLLangfuseOpenTelemetryRAGPgVectorLiveKit
Expertise
Skills & Technologies
A toolkit for shipping web, mobile, and AI-powered products end to end
Frontend & Mobile
- React & React Server Components
- Next.js App Router & Remix
- React Native & Expo (Expo Router, NativeWind, EAS)
- TypeScript (Strict & Advanced)
- Tailwind CSS & Styled Components
- State Management (Zustand, TanStack Query, Redux)
- Testing (Vitest, Jest, Playwright, Maestro)
- Accessibility & Storybook
Backend & Platform
- Node.js & Bun · Fastify
- Typed APIs (REST, GraphQL, Zod)
- PostgreSQL & Redis (Prisma, Drizzle, PgBouncer)
- Auth & Sessions (better-auth, OAuth, OTP, JWT)
- Background Jobs (BullMQ)
- WebSockets & Realtime Systems
- Serverless & Edge (Cloudflare Workers)
- Docker & Fly.io
AI Engineering
- LLM Integration (OpenAI GPT-5, 4o vision)
- Typed Prompts (BAML)
- AI Observability & Evals (Langfuse, OpenTelemetry)
- Multimodal Document AI (OCR, receipt parsing)
- Realtime Voice Agents (LiveKit, OpenAI Realtime)
- Agents & Tool Use
- RAG & Vector Databases (PgVector, ChromaDB)
Architecture & Delivery
- Monorepo Architecture (Bun workspaces, shared contracts)
- Event-Driven & Queue-Based Systems
- Billing & Subscriptions (Paddle)
- Observability & Monitoring (Sentry, PostHog, pino)
- CI/CD (GitHub Actions, EAS, Fly.io)
- System Design & Scaling
- Performance Optimization
Also proficient with
Bun
Git
Prisma
Sentry
PostHog
React Email
Portfolio
Featured Projects
A selection of projects showcasing my expertise in web development and AI engineering
Rehook
Stop changing webhook URLs between local, staging, and each dev setup.
NextJsFastifyBullMQ+5
Impact: Pre live development daily tool
Uplofile
Unopinionated React upload component published on npm. Built with TypeScript and Tailwind CSS for maximum flexibility and ease of integration.
ReactTypeScriptTailwind CSS+1
Impact: Published npm package
React Email Template Bootstrap
A professional, unopinionated starting point for building React-based email templates. Decouples email design from triggering logic with a render API and type-safe package.
ReactTypeScriptTailwind CSS+2
Impact: Open-source template with live playground
Articles
Latest Thoughts
Insights on frontend architecture, AI engineering, and building products that scale.
Where BAML Fell Short for Finnbud (And What We Kept)
BAML gave Finnbud type-safe AI outputs fast. But as our AI layer grew, prompt management, versioning, observability, and evaluation became more important than the parser. Here is where we kept BAML and where we moved on.
Sep 22, 202611 min read
Should I Use OKF or a Vector Database? (They Solve Different Problems)
Open Knowledge Format and vector databases both help AI agents access knowledge, but they operate at different layers. One is a format. The other is infrastructure. Here is how to choose.
Jul 5, 20265 min read
The CSS Tailwind War (and Why Both Sides Are Right)
I was never a fan of Tailwind until I understood why it was created. The debate is not about which is better. It is about which problem you are solving.
Jun 15, 20266 min read
Contact
Let's build together
Have a project in mind or want to discuss opportunities? I'd love to hear from you.
Response Time
I typically respond within 24-48 hours. For urgent matters, please reach out via LinkedIn.
Work Authorization & Location
Location: Relocating to Berlin, Germany (Opportunity Card / Chancenkarte in progress)
Work Authorization: German Opportunity Card (Pending) - Target Location: Berlin
Work Authorization (Nigeria, Africa): I am legally authorized to work in Nigeria