~/sajid.dev/about
About · whoami

Senior solo full-stack engineer. AI, backend, web3.

I'm Sajid. I build production systems alone — architecture, code, infrastructure, ops, end-to-end. The kind of work usually spread across a small team, run by one person who can hold the whole shape in their head.

For three years I was the only engineer at Darkblock, building a decentralized unlockables platform that served thousands of users and an SDK partners integrated against. Since 2024 I've been independent — shipping production AI for a private client (Tenure — ~330K LOC, hybrid retrieval, voice, multi-format ingestion) and a Web2.5 film-distribution platform (Pureland — live at purelands.biz, 11 weeks blank-repo to production, three payment rails, Cloudflare Workers decrypting at the edge).

What I do well: take a vague mandate, hold the architectural shape in one head, ship it correctly the first time. What I don't do: customer-facing engineering, sales-engineering, dev-rel as a primary role.

6+
years shipping production
1
engineer on every project
~330K
lines on active AI engine
11 weeks
pureland zero-to-live
Skills · $ cat ~/.toolbelt

What I reach for.

AI & ML
  • RAG / hybrid retrieval (BM25 + vector + RRF)
  • Knowledge-graph construction
  • LLM orchestration & persona systems
  • Embeddings · semantic search · prompt engineering
  • OpenAI SDK (provider-agnostic)
Backend
  • NestJS · FastAPI · Node.js / Express
  • TypeScript · Python
  • Microservices · event-driven architectures
  • BullMQ · Redis · Prisma ORM
Web3 / Blockchain
  • Unlock Protocol · ethers.js v6 · Polygon
  • Thirdweb SDK · SIWE wallet auth
  • Arweave (via Irys)
  • Smart-contract integration & signature verification
  • Web Crypto API
Cloud & Infra
  • AWS (Step Functions, Lambda, ECS Fargate, ALB, Amplify, S3, OpenSearch, Secrets Manager)
  • Cloudflare Workers + KV
  • Docker · GitHub Actions CI/CD
  • Fly.io · Firebase · Nginx
Data
  • PostgreSQL · MongoDB · DynamoDB
  • Elasticsearch · OpenSearch
  • Vector databases
  • Looker · Metabase
Frontend & Mobile
  • React 19 · Next.js 15 (App Router) · Tailwind
  • React Native
  • Android SDK · iOS SDK · Swift · Kotlin
Payments
  • Stripe
  • PayPal REST v2 (OAuth2 + webhook verification)
  • Unlock Protocol checkout
see the workget in touch